Showing 1 of 1866 conversations about:
Strad1679
106
Jul 28, 2015
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Massdrop should not be using the Objective 2 name on this product. The design changes are in clear violation of the license (see below). Their desire to remove all text from the case is likely an acknowledgement of this, yet they reference the licensed name seven times on the product page. This offering could have a serious impact on the open source audiophile community and I, for one, will not be supporting it. Massdrop should either stick to the specs in the license or call this thing something else.
Below is a list of all of the changes that are different from the original spec. This list is from an extremely reliable source. I realize the final design is subject to change (red flag), but it seems obvious that they have no intention of sticking to the license.
"R25 - 5% instead of 1% - Impacts power management. More likely to cycle on off when batteries are low.
Blue LED - Requires power management circuit changes.
'Finally, the LED’s forward voltage is a critical element of the power management circuit. You can't change to a different color (especially white or blue) without making other changes as that will require more current and the different forward voltage means the power management circuit has to be altered.'
C13/C14 - WIMA 1.5uF present instead of 2.2uf. This is a critical audio path capacitor. The smaller value here will impact low frequency response! This is a serious alteration with performance implications. WIMA costs more, but red capacitors sell better than grey. Reducing value reduces cost (and performance).
R1/R2 - Generic charging resistors are present.
C6, C7, C10, C15, C17, C18 - Film caps have been replaced with generic parts.
C1 - Replaced with generic part.
C16, C21 - Ceramic caps have been replaced with film parts.
VR1 - Alps RK097 series potentiometer with 15A taper has been swapped for a lower cost part (unknown volume taper and balance).
Q1 Q2 - Power supply MOSFETS differ from standard parts. Q1 and Q2 are critical parts which affect opamp performance and turn on/off behavior. Discussed extensively in original article."
Jul 28, 2015
Strad1679
106
Jul 28, 2015
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You are correct. I should have been more specific in pointing out that the BOM is where the infringement is occurring. They will argue that the PCB design and signal path haven't been altered, but the BOM is part of the license. There is no way they can justify the substitution of inferior parts that are not in the original BOM.
Jul 28, 2015
EniGmA1987
497
Jul 28, 2015
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Thank you for posting. While your info is good on the parts shown in the early picture, your opinion on them not using the O2 name is worthless since it has been said this will adhere to the O2 specs, and what you have said is a complete lie from the info we have. Will (from Massdrop) has said on multiple occasions this will be the same amp as required by the license terms. It is sad to see really how many "endorsements" your post has, as it just shows people are reading what you said and believing your lies.
Jul 28, 2015
Strad1679
106
Jul 28, 2015
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No need to resort to personal attacks. I am simply pointing out that the BOM (Bill Of Materials) is part of the license. It's not enough to say that the Massdrop version is functionally the same. The license stipulates that a specific list of approved materials be used, not just by type but by make and model. Any deviation from that list means that this device cannot legally be called an Objective 2.
Jul 28, 2015
chzel
172
Jul 28, 2015
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Well, to quote Will's post in page 2 "The intention with our take on the Objective 2 amplifier is to make the product accessible to more people while honoring the spirit of the design as well as the licensing terms as much as we possibly can."
"Our take", "honoring the spirit of the design", "as much as we possibly can".... There is no "our take". There is NwAvGuy's take. Anything other than that is a violation. "Honoring the spirit", I read that as "we'll change what we need to, but we honor it", again in violation. "As much as we possibly can"..How much exactly is that? Are there obsolete parts in the BOM? (IIRC only the AC jack is discontinued). Why did they need to make a prototype for a known design, while admittedly not using the specified parts? O2's design is pretty specific. All amps should measure the same within mfg tolerances.
Jul 28, 2015
slashfoo
20
Jul 28, 2015
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I'll be following this conversation more closely, I already have an O2, and I don't think I'd settle for anything less. I already joined the drop but I'll remove myself if this is not a real O2.
Jul 28, 2015
andrew.b
261
Jul 28, 2015
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thanks for the in depth response. since I've already joined the drop, I'm really just waiting for Will or someone else from Massdrop to respond now. I have 6 days left to make up my mind.
Jul 28, 2015
chzel
172
Jul 28, 2015
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I have an O2 from Head'n'HiFi as well and I absolutely love it, and I don't really like what I'm seeing here.
Jul 28, 2015
MonsieurKirby
154
Jul 28, 2015
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I think it's silly to think there aren't alternative parts available that could be used. However, it's also silly to think any part could be swapped out and expect the same performance as the reference.
It would be nice if Massdrop is more transparent about what is going on exactly. I also hope we will see more testing done, because the numbers Will has posted is not enough. Ideally, there really needs to be a much more detailed engineering test report including test methodology and raw data. Otherwise, the numbers could have been fabricated (possibility, not accusation). It's also making me wonder why Massdrop sent the prototype off to Grace Design for testing, if the design wasn't already close to final.
Anyways, as NwAvGuy says, "the idea is the best implementations of the O2 should win." As long as there are no compromises to quality and performance, this would certainly be a win for everyone.
Jul 28, 2015
slashfoo
20
Jul 28, 2015
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yeah, mine is from Mayflower Electronics, and I absolutely love it, this is a fraction of the cost, but I'd rather go with the higher price than something that didn't perform to spec.
I'm in line with the comments that this should be named something else, as O2 is a very specific performance and board; I would expect an O2, not an O2-ish amp, so I think the title is misleading if the BOM is different. I have retracted my support for this drop.
Jul 28, 2015
Strad1679
106
Jul 28, 2015
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With all due respect, I have to disagree. Right or wrong, anything that carries the O2 branding is going to be associated with NwAvGuy. He, of course, knew this when he included a BOM in the license. It doesn't matter that some other part may technically work. It wouldn't even matter if that part made the unit perform better. Plain and simple, the license has to be followed to use the name. If this type of thing is allowed to happen you will undoubtedly start seeing posts in forums like "I have an O2 and it totally sucks". Well, was that O2 made in strict adherence to the license, or was it modified? The highly regarded reputation of the original device, and it's creator, are directly threatened by any product that makes unauthorized alterations and then simply steals the name.
I didn't mention this earlier, because it is engaging in hearsay, but my source also told me that Yoyodyne Consulting Inc., the owner of the ObjectiveDAC license, is so furious about this development that they may pull the license for the ODAC to prevent something similar happening to that design. I do all of my audio editing through an ODAC and it is one of my most valued pieces of kit. I would hate to see that design go away just because Massdrop wants to squeeze out a little more profit, rather than simply partnering with one of the licensed manufactures of these products.
To say this drop is having a chilling effect on the open source audiophile community is not hyperbole.
Jul 28, 2015
Will
6639
Chief Product Officer
Jul 28, 2015
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Hi @Strad1679,
Thanks for your posts! Seems like there's a big question on lots of people's minds ( re: @ybz90, @zoomorph, and many others ) that I'd like to answer.
Q: Are the O2s being produced exactly the O2 as defined by NwAvGuy's original BOM? A: Yes, the O2s everyone is purchasing in this drop will be built the with electronic components specified in NwAvGuy's original BOM.
It's clear there's a lot of confusion around this but hopefully that provides the clarification everyone is looking for. If you buy an O2 on Massdrop, you will receive an O2 made to NwAvGuy's spec as mandated by the O2's license.
Let me know if you have any questions about this, I'll be around all afternoon and evening addressing all the great suggestions we've seen in this discussion thread over the last couple days.
Jul 28, 2015
chzel
172
Jul 28, 2015
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That is a nice confirmation to hear Will, and I hope it turns out well. Yet this comes 6 days later than it should, and after your comments leaving a lot to our imagination. I can't avoid thinking this is an ad hoc decision, in response to our comments. I have said before in comments that you (Massdrop) need to be more clear in the descriptions. Marketing is a nice concept, but our money go towards actual products and we need actual information. I'd propose an extra tab between "Description" and "Discussion" named "Specifications" or "Facts" or whatever, where all the needed details will be listed, no marketing speak allowed.
Jul 28, 2015
MonsieurKirby
154
Jul 28, 2015
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Thank you for making that clear.
One thing that's still unclear is what is meant by everyone's opinion has the potential to impact the final design (and this vague statement in the product description may have exacerbated this confusion over parts being used in the Massdrop O2). There are even suggestions that would never make it into the O2 because of the significant modifications necessary (and violating the license at the same time). I would assume "design" really meant choice of finish and whether symbols or text was used, but what about optional things such as 1/4 jack, RCA jacks, rear power jacks, etc?
Jul 28, 2015
MonsieurKirby
154
Jul 28, 2015
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I doubt the same thing can happen to the ODAC. The license is different and really, Yoyodyne Consulting holds authority over the ODAC, unlike the O2, where anyone can see the blueprints, build it, and sell it.
I understand what you are saying about the O2. However, if we stick with a strict interpretation of no derivatives, no modifications, then was it legal for JDS Labs to make the v1.1b O2? At what point is it legal and not legal?
I should make this clear - I am not saying anyone should start swapping components.
I'm still thinking about this, and I re-read NwAvGuy's comments on commercial implementations. It is clear to me now that no modifications should be made if the product is to be sold commercially. I may have been confusing this with DIY implementations. So I guess when some parts are no longer in production, we'll all have to build the O2 ourselves.
Jul 28, 2015
MaNiFeX
217
Jul 29, 2015
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Very interesting thread. Was considering getting one, but with all the unknowns, I'd rather just build one myself... sourcing a nice case, parts, etc. is the time consuming part, though.
What is the general consensus of this build right now?
Jul 29, 2015
MonsieurKirby
154
Jul 29, 2015
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If a part meets specifications, but it came from abc manufacturer instead of xyz manufacturer, does this make it a derivative or modification?
I certainly think that if the LED was changed to blue instead of red, it will make a significant impact on the performance of the O2 (blue LEDs often, if not always, have larger forward voltage drops than red). I also certainly do not wish to imply that someone should "improve" the O2 and sell it.
"I believe John at JDS made comments to the effect that NwAvGuy's reasoning is to avoid the production of pseudo-O2s with highly variable reliability and performance, which in turn, would reflect poorly upon the design in general."
I wholeheartedly agree.
Jul 29, 2015
Will
6639
Chief Product Officer
Jul 29, 2015
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Hey Chzel,
Thanks for your post! There are definitely a lot of moving parts for this drop and the idea of adding another tab as a sort of FAQ section has been discussed and debated internally.
In the future, these types of custom products will have a different kind of page associated with them where it'll be easier for community members to contribute and answer common questions for the group.
Let me know if you have any specific questions going forward, glad to answer.
Jul 29, 2015
MonsieurKirby
154
Jul 29, 2015
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Please see Will's post regarding parts used in the O2. It seems clear to me that it will be a standard O2 following the BOM. https://www.massdrop.com/buy/massdrop-o2-amplifier/talk#!242232
Jul 29, 2015
Strad1679
106
Jul 29, 2015
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This is contradicted by previous posts you have made, and the images of the product that currently reside on the description page show components that are not on the BOM. Please don't insult us by implying that this was the intention all along. Just be transparent and admit that the negative posts caused you to rethink your decision. This community deserves an acknowledgement of your course correction, as well as a promise that you are going to honor open source licensing in the future.
Jul 29, 2015
facecheckkings
0
Jul 29, 2015
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Hi Will,
What are the chances that the final drop will incorporate 1) rear power jack and/or 2) rear input?
Thanks
Jul 29, 2015
Will
6639
Chief Product Officer
Jul 29, 2015
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Bonjour Monsieur,
Merci pour la réponse! Alright, now that we've exhausted my high school french, that's a great question about the "impact on final design" point.
When I posted that, I intended it to focus on the cosmetic aspects of the product (front panel material and printing primarily as you guessed) but there's been a ton of people asking for more structural changes (different gain options, moving input/powers, etc) and we're checking with our manufacturing partner but I expect any sizable revisions like that would incur meaningful additional wait time. All the ppl requesting a non-red LED are out of luck because of license sadly.
I'll be posting an update on this once we have more info, but again, I'd say there's more to be done with the purely cosmetic stuff than with the bigger structural points.
Jul 29, 2015
Will
6639
Chief Product Officer
Jul 29, 2015
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Hey Strad1679,
Appreciate you taking the time to respond to my post! Interesting point you bring up about posts contradicting each other, not my intention, and I'm not sure where the specific contradiction lies. If you're referring to this post: https://www.massdrop.com/buy/massdrop-o2-amplifier/talk/238649 where I say "The final unit will have everything as close to spec as we can get", it's worth knowing that the closest we can get is exactly the spec.
At this point I hope it's clear that we've planned to honor NwAvGuy's spec and license since the beginning (given our track record of honorably handling community designed products, re Ergodox, Infinity Keyboards, and community designed keycap sets in the mechanical keyboards community) but I can also see why my initial wording could be cause for concern.
That said, letting our contract manufacturer sub in some alternative parts to get us a prototype for pictures was definitely a poor choice we won't be making again. Think of how much pain and suffering could have been avoided if we'd waited the additional couple weeks it would have taken for sample quantities of all the proper parts to reach the manufacturer. Lesson learned there for sure.
Do you think it would be best to remove the PCB photos up right now to avoid confusion? Obviously it'd be best to post pictures of a PCB from our contract manufacturer with all the parts according to spec, but there's probably not enough time in this drop to make that happen... Actually, probably easier to add some notes on the pictures to avoid confusion instead. Let me know your thoughts on this.
Overall, I don't think you'll find me apprehensive to acknowledge the incredible work you and other community members do in discussions and polls. Much the opposite actually, this community is what makes Massdrop worthwhile IMO. Posts like yours, with intense attention to detail and strong opinions make for far better discussion than a predictable hype train.
It's been our goal from day one to give the community credit where deserving (as we have in the past when we've adjusted our course of action based on overwhelming community feedback, see this drop discussion https://www.massdrop.com/buy/corsair-rgb-gaming-keyboard-and-mouse), sadly, all this confusion is the result of my poor wording choices, for that I am sorry.
All in, you can be sure we'll continue to honor open source licensing, and I'll have a couple more people look over my choice of words before posting on sensitive topics : )
Jul 29, 2015
Will
6639
Chief Product Officer
Jul 29, 2015
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Hi facecheckkings,
Initially we intended for the "suggest changes" to focus on cosmetic details associated with the front panel, that said, it's clear there's a lot of interest in rear power and rear inputs.
As such, we're checking with our manufacturing partner, but it looks like incorporating a substantial change like that would increase lead time meaningfully.
I hope to have an update on this shortly.
Jul 29, 2015
colinssc
11
Jul 29, 2015
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Hi Will
What are the power specifications for the amp? There are a few of us from Australia that are looking at this but we have 240 voltage here. Will it work fine?
Thanks
Jul 29, 2015
avitron142
134
Jul 29, 2015
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Your the man, Will. Keep up the good work!
Jul 29, 2015
dcba
33
Jul 29, 2015
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how a simply change of resistors and solder the power/input at different angle will cause additional time. while an amateur like me can finish putting everything together while triple checked everything and got it done under 2-1/2 hrs. this is just not even funny when the factory have way more experienced people and time than they need to build a merely over 1k products.
Jul 29, 2015
bickel72
30
Jul 29, 2015
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Hi Will,
Many of us I'm sure would have no problem waiting just a little bit longer if it meant getting a better overall product at the end of the day. Especially if you incorporated some of the popular changes suggested like the rear power jack.
Jul 29, 2015
slashfoo
20
Jul 29, 2015
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it's good to read that what I'll be getting will be an O2; I re-joined the drop after canceling my support for it when I read the discussion. There is a lot of confusion but I'll take your word as the authoritative source.
Thanks for clarifying.
Jul 29, 2015
needhelp
282
Jul 29, 2015
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patience my friend. patience.
Jul 29, 2015
zoomorph
422
Jul 29, 2015
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Snipped from your earlier comments:
"These prototypes were constructed using parts immediately available. That’s why there are some deviations from the original design. We are still adjusting the design (those details I mentioned in my original post), and we will be updating the group with any major revisions here in the discussion. Those final design elements will be decided shortly before the drop ends (we’ll release the changes in an email to all participants ."
"This means every piece feedback we receive has a very real chance of making into production."
"The intention with our take on the Objective 2 amplifier is to make the product accessible to more people while honoring the spirit of the design as well as the licensing terms as much as we possibly can."
"The followup question is "Then why do other companies have O2s with different outputs and inputs?" and the answer is, as far as we can tell, they're not obeying the rules of the license. Feel free to jump in and tell us if you know better."
Basically, any reader of those comments would get the impression that Massdrop is NOT planning to follow the design and license exactly. We see discussion about making adjustments and revisions, which would be unnecessary if following the specifications. We see requests for feedback and suggestions, implying that the design is open for change. We see vague claims to want to honor the "spirit" of the license, rather than honor the license itself. We see a desire to honor the license "as much as possible", rather than simply to honor it. Finally, we see that other companies have already broken the license, in your opinion, which begs the question of whether it would be OK for Massdrop to break it too.
So many vague words. So much uncertainty and doubt. You're trying to tell us that it was not intentional and that you always meant what you didn't say. If true, then that's a mistake on par with publishing pictures of the prototype using the wrong components. But does anyone actually believe that, or do we all believe that you meant what you said, were intentionally ambiguous, and only made up your mind after all of the negative feedback? :-)
Anyways, I'm glad that you've now settled this and vowed to follow the specifications exactly for the final product. I hope that you'll have the final prototype reviewed for correctness just to be sure.
Jul 29, 2015
Strad1679
106
Jul 29, 2015
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I appreciate your comments, Will. Since you asked, I think you started off wrong from the beginning by having a prototype created, and then testing it and posting the results. Why would you create a prototype of a well established design? If done by the license, you would end up with a device identical to every other O2 ever made. Even the use of the word "prototype" implies that you are experimenting. To the open source community it appears as if you are looking for alternative components to drive the cost down, and then justifying it by posting favorable performance results.
Then, there were the marketing images you posted on the description page. They are so clear that you can identify most of the replacement parts. Again, adding to the suspicion that the license will not be adhered to. I mean, there is a shinning blue LED in the very first image! Anyone who has followed NwAvGuy would immediately know something was amiss without even looking inside the case.
Some of your posts also contributed to the confusion. I don't want to belabor the point, but here are some examples:
"the final unit will have everything as close to spec as we can get" - You are either compliant with the license or you aren't. There is no reason why the device can't be made to the exact specification outlined in the license.
"We are still adjusting the design" - Again, the design is what it is. It's all spelled out in the license.
"Those final design elements will be decided shortly before the drop ends" - Lends to uncertainty that we are, in fact, going to get a genuine O2 as dictated by the license.
"every piece feedback we receive has a very real chance of making into production" - Many of the suggestions offered would violate the license. They should have NO chance of making it into the final product.
"honoring the spirit of the design as well as the licensing terms as much as we possibly can" - Honoring the spirit of the design is an amorphous concept. This is electrical engineering. You either followed the design or you didn't. The same with the licensing terms. If other manufacturers have been able to adhere to the license, then you can too.
I realize that the quotes I referenced are out of context, but you basically hit every no-no word you possibly could. When you use words and images like those you chose it can't help but ruffle feathers. Despite all of the licensing, open source really depends on the honor system.
Don't touch what I say you can't. Change anything else you want. Give it to whomever you choose.
If you mess with that first point you undermine the willingness of people to release things as open source. Why should anyone attach their name and reputation to a design or piece of software, for no profit, if no one will respect the license. This device is just one small example. Imagine what a different place the world would be if Linux were never released.
All of this confusion could have been avoided by simply stating from the beginning that you were offering a fully compliant O2. No talk of prototypes or pictures of cases full of the wrong parts. At this point, I have no choice but to take you at your word. And I am happy to do so. But you better believe after the craziness of this thread people will be cracking open their O2 to see what's inside. I sincerely hope they aren't disappointed.
Jul 29, 2015
TheUltrabike
19
Jul 29, 2015
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It is now fairly clear that Massdrop intentions are to follow the spec as closely as possible. I'm more than happy with that and with the amazing discount.
If your problem now is the confusion that the pictures represent and Will's original words, you can always not buy this product and go spend $150 (or more) on the JDSLabs or Mayflower version.
I'm personally more than happy with this offering, since it's the first time I see this product on the more affordable side of things. At $150 I would not call this product a giant killer at all and IMO a violation to NwAvGuy original claims of offering an affordable product. It also goes to show profit margins of other manufacturers.
When I get this product I will check it out and characterize it as best as I can. And I'm fairly sure Massdrop will deliver the goods.
I also love the box and volume knob of this version... and that it's black.
Jul 29, 2015
dcba
33
Jul 29, 2015
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MD is the only place that listed the o2 at 150. mayflower have it for 100 and jdslabs selling it for 130 with the option of rear ac and 1/4" out (extra cost of course). better yet. get all the parts for 46.33 and build your own o2.
Jul 29, 2015
TheUltrabike
19
Jul 29, 2015
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JDSLabs is $150 after you pay for shipping and add the power adapter.
I think I saw the Mayflower one for more than $100, but it's currently on sale for $100. I wonder why (Massdrop maybe?). I mean, their DIY O2 is $95...
Building your own I think was more than $46.33 after you buy the custom case, unless you machine it yourself.
Jul 29, 2015
Will
6639
Chief Product Officer
Jul 29, 2015
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Hey Strad,
Yup, I think you've encapsulated the point well. Nobody should be disappointed with the final result.
After our experience working with products designed by the mechanical keyboard community, I expect to see a number of posts with people converting these units into DIY kits to check for part consistency.
Thanks again for taking the time to post and have this discussion. There was a time not too long ago where I was debating with the other two Massdrop employees (we've experienced a bit of growth since then) about whether or not people would ever be interested in posting in a Massdrop discussion.
The fact that these conversations can happen on Massdrop is amazing and I'd never trade it for the kind of standard "follow me, follow back", "this product is great A++" fluff you see in almost all product page related discussions.
You can count me among those endorsing your posts.
Jul 29, 2015
Will
6639
Chief Product Officer
Jul 29, 2015
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Hey Bickel,
Yep, I hear you. Check out Zoomorph's post here: https://www.massdrop.com/buy/massdrop-o2-amplifier/talk#!242441
I'm checking into whether or not this is possible. seems like this would give us the best of both worlds.
Jul 29, 2015
Strad1679
106
Jul 29, 2015
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My lack of participation in the drop isn't because I have any remaining reservations, it's because I already own one. But when I saw the obvious discrepancies in the pictures and the initial posts I thought someone should jump in and try to keep everyone honest about whether this drop was going to be compliant with the license. NwAvGuy has gone incognito, so if I can play some small part in making sure his design and license are respected and adhered to, I am happy to do so.
Jul 29, 2015
deathson
33
Jul 29, 2015
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How about the Warranty? I don't think you can provide DIY Kits that No need to dis-solder parts. DIYers need to solder new parts on PCB, Will it break the Warranty? If it will break the Warranty, It's a pointless DIY Kits.
Jul 29, 2015
Steaz
15
Jul 29, 2015
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The point is the reduced price, and the fact that many people actually find it fun to build things themselves.
Jul 29, 2015
Will
6639
Chief Product Officer
Jul 29, 2015
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Given the simplicity of the mod, we'd probably take a position similar to what Deck does for the keyboards.
They basically say that modding doesn't immediately void your warranty, but they wont cover warranty replacements for units where the modding resulted in the unit breaking (and they get to make that determination). Generally, especially with these types of mods, it would be pretty easy to figure out if someone's mod resulted in their unit breaking.
Anyway, this is all speculation until we figure out if this semi-DIY option is a possibility. Stay tuned for updates.
Jul 29, 2015
chzel
172
Jul 29, 2015
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My thoughts exactly. Proud owner of an O2 and mad respect to NwAvGuy.
Jul 29, 2015
MonsieurKirby
154
Jul 29, 2015
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The community is certainly better with active enthusiasts like yourself and many others. Thank you for chiming in, and, or course, thank you everyone.
It's definitely been more interesting than if it had been a discussion full of "REAR POWER!"
Jul 29, 2015
EniGmA1987
497
Jul 30, 2015
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Pretty sure the "contradiction" is simply your misunderstanding what was said. If you read the initial description completely and the first 2-3 pages of discussion you would see where Will said various things like "cannot do X feature because that would be modifying the design which would be against the license". It was pretty clear to just about everyone that this would adhere strictly to the license terms until you and another guy came in here and started lying about how it was somehow confirmed this wouldn't follow the license. Thankfully that has been completely refuted yet again so there can be no more of people like you just trying to add confusion to things.
Jul 30, 2015
EniGmA1987
497
Jul 30, 2015
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Ya I suppose when you take specific comments out of context and arrange them all in a way like you want then they can look like the comments mean something different. People who were actually reading the discussion in order knew that replies were to specific things and that it was said the design would follow the license and original BOM.
Jul 30, 2015
zoomorph
422
Jul 31, 2015
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Feel free to refute my argument if you can. Simply accusing me of distorting the meaning of things out of context with no evidence or explanation is not an argument.
Jul 31, 2015
Noldir
66
Aug 1, 2015
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I understand wanting to keep the bom list, but I know nwavguy talked about changing the gain if needed. Isn't that something that could be done? Lots of users would like a lower gain I believe...
Also, after reading a lot of posts. Will there be a 240v version?
Aug 1, 2015
Siegfried
32
Aug 2, 2015
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Are you going to provide 220v adapter for those who needs one ? And do rear panel from JDS or mayflower fit to add ODAC later ? Or are planning to sell your own rear panel if those from other sellers don't fit. Waiting for answers to see if I join or not. Also 1X / 3X gain requested and rear power if possible.
Aug 2, 2015
asymcon
30
Aug 2, 2015
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You can mod the gain by yourself (I have mine set up for 4x and 10x). Just remove R19 and R23 and fit in more suitable value. Here's a formula (R17 and R21 are for low gain settings):
R17 = R16/(Av-1) = 1500/(Av-1)
Where Av represents gain
For gain of 10x: R17 = 1500/(10-1) = 1500/9 = 166.67 ohms The closest 1% tolerance resistor is 165 ohms.
Aug 2, 2015
asymcon
30
Aug 2, 2015
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Calculate your desired gain based on the formula I replied with to Noldir. Hope that helps. ;)
Aug 2, 2015
FuckHead-Fi
380
Aug 11, 2017
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Wow that's messed up.
Aug 11, 2017
ImBullseye
12
Aug 15, 2017
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I own an O2 from headnhifi and I like it a lot. Working abroad I wanted to buy one of these to take with but now I am not sure if I should cancel my order.
If I am buying this I expect it to follow Nwavguy's original design and performance. If I am not guaranteed this I will cancel the order.
From reading Will's post I am still unsure if this will follow the original design or not.
Aug 15, 2017
Jimster480
380
Aug 3, 2018
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Its not following the design based on what was posted. This means its not an o2 and is just a random amp that looks like an o2.
Aug 3, 2018
Mayflower_Man
9
Sep 12, 2018
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All of these are mostly moot points for me, because for 5 dollars more, I could get an extremely similar product with a much better 10 year warranty, which is also made in the U.S. It was an easy decision to buy from Mayflower instead.
Sep 12, 2018
paperassgasket
27
Jun 2, 2019
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Wish I had read this before I bought my O2 recently. Mine just died after very little use. Likely a Q1/Q2 failure. I guess at least I have a board and case to build my own now...
Jun 2, 2019
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