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For those considering using the DX7 Pro as a headphone amplifier, please note that the Output Impedance of the 1/4"-out is roughly 5 ohms, and the XLR-out is roughly 10 ohms. Most higher-grade amplifiers have an Output Impedance of less than 2 ohms. With lower-resistance headphones, this unit will produce unpredictable distortion, especially in the bass frequencies.
(Edited)
verifonix
1181
Oct 7, 2019
mattrisFor DX7 Pro, single ended is actually <5 ohm, XLR <10 ohm, massdrop got the spec wrong...
(Edited)
verifonixThanks, I amended my comment. Still too high! Come on, Topping!
Ostewart
246
Oct 7, 2019
mattrisYou should add this is when using BA and Dynamic driver earphones. Planar headphones have a linear impedance response so are mostly immune to any issues from high output impedance.
(Edited)
LuckyLuke575
561
Oct 7, 2019
mattrisYeah, this can be an issue and is the one shortfall of the design, but only with low impedance cans. With 58Xs, 6XXs and studio Beyers it shouldn't be an issue. I think the planars and IEMs will have an issue here. It's a pity because the SQ readings are stellar.
Ostewart
246
Oct 8, 2019
LuckyLuke575See my comment, Planar will be fine, it's low impedance dynamics and multi BA IEMs that will be at risk of changes in FR.
LuckyLuke575
561
Oct 8, 2019
OstewartCool. I only listen to my IEMs OTG, so it's not an issue for desk use. If someone really wants an amp for IEMs, than a FiiO unit like the Q1 Mk II would do fine (it's basically designed for that plus it has the 2.5 mm balanced output).
verifonix
1181
Oct 8, 2019
OstewartYeah (most) planars don't care about the impedance output due to their typically flat impedance curve.
(Edited)
Marutk
75
Nov 5, 2019
mattrisDoes it work with Focal Stellia ( 35 ohms )?
verifonix
1181
Nov 5, 2019
MarutkOnly if you don't use balanced
Roseville
7
Nov 5, 2019
mattrisWould the DX7 Pro be a good match for the Audeze LCD-X? I'm a newbie and need help deciding on a dac/amp for my desktop computer. Thanks in advance for any help. The specs for the LCD-X are: SpecificationsStyle Over-ear, open-back Transducer type Planar Magnetic Magnetic structure Proprietary magnet array Phase management Fazor Magnet type Neodymium N50 Diaphragm type Ultra-thin Transducer size 106 mm Maximum power handling 5W RMS Maximum SPL >130dB Frequency response 10Hz - 50kHz THD <0.1% @ 100dB Impedance 20 ohms Sensitivity 103 dB/1mW (at Drum Reference Point) Minimum power requirement >100mW Recommended power level >250mW Weight 635g
RosevilleDo you already own the LCD-X? What will you be listening to when you're at your computer? Would it be beneficial if the DAC/amp could easily be used at another location (another room of your house, work, travel, friend's house, etc.)?
Marutk
75
Nov 6, 2019
RosevilleImpedance of this amp is too high for LCD-X
handliner
0
Nov 6, 2019
mattrisYes Mattris I own them along with the Sennheiser HD 650. Well I ripped all of my music to flac that is on a external hard drive. This is played with JRiver. I also play music with Tidal. I have several devices presently that I have acquired through the years . Meridian Explorer2 (mqa), Audioengine black usb (2nd gen), Schiit Modi multibit, Chord mojo, Pono, Bluesound node 2i, Topping DX7s, Schiit Valhalla 2, Schiit yggy(listening room). No, I am not looking for any portability at this time, my plan is to move the DX7s up to the main level of my house on the computer desk along with the Valhalla and to move the Node 2i and Modi multibit to another room in the lower level where I have another playback area. From what I have read the DX7 Pro would be a good match with the LCD-X , just trying to verify. I think that I have found the right place to ask as there are a lot of knowledgeable people here.
verifonix
1181
Nov 6, 2019
Roseville@Roseville The amp will work well for the LCD-X since it is a planar. Just about every planar's frequency response doesn't change depending on the impedance output, their impedance response curve is 'flat'. So no @Marutk this amp is totally fine...
(Edited)
Roseville
7
Nov 7, 2019
verifonixThank you to everyone helping out with this! My apologies to mattris as my reply was from my original Drop account that was created a while back and forgot about. verifonix when you stated " Just about every planar's frequency response doesn't change depending on the impedance output, their impedance response curve is 'flat'." Is there any possibility that the LCD-X could be the one of the exceptions? Here is a review from innerfidelity with measurements. https://www.innerfidelity.com/content/audeze-lcd-x-fazor-and-fresh-listen-current-lcd-2-and-lcd-3 Does this review confirm that the frequency response doesn't change with the impedance output from the LCD-X. I just do not know what to look for in the review measurements and need a little help before buying the DX7 Pro.
RosevilleNo problem, Roseville. May I ask why you have your eye on the DX7 Pro? Other than its DAC and amp, do you plan on using any other of its features? What input sources do you have at your desk?
Roseville
7
Nov 7, 2019
mattrisGood Question. Well the size is ideal in my setup and I love the aesthetics . To me Topping offers in this dac/amp a product that has been very well engineered with the ability to playback my flac and DSD files at a affordable price. Just want to be sure this is a good match with the 20 ohm LCD-X' That is why earlier I left the review from innerfidelity. So that someone who has the knowledge to decipher the graphs will be able to recommend this dac/amp or advise me to look for another dac/amp. My plan is to use the rca output provided to connect to my desktop speakers. Also I will have the opportunity to listen to my computer's cd player. Let me say that in the past my headphone listening was very limited as I mostly listened to either vinyl or cd's in my theater/2.1 channel room. Not anymore, headphone listening has brought a lot of enjoyment and fun into my life.
verifonix
1181
Nov 9, 2019
RosevilleYou can see frequency impedance curve here: https://www.innerfidelity.com/images/AudezeLCDX.pdf it's quite flat as expected :)
Roseville
7
Nov 9, 2019
verifonixThanks verifonix, just wondering if you think that the dx7 pro would be a noticeable upgrade compared to the topping dx7s. Hope you don't mind me picking your brain. Wondering where mattris is?
verifonix
1181
Nov 10, 2019
Rosevillehmm if you go dx7s output into a good amp like archel2, thx aaa amp, smsl sp200 .... then no. the dx7pro is better as all-in-one device but I wouldn't change dx7s to dx7pro if you already own dx7s. just use a good amp and you're done
(Edited)
RosevilleI agree with verifonix. Just use your DX7S with a nice amplifier of your choice. Go with balanced connections all the way. I'd say get a THX amplifier (from Drop or the upcoming one from Monoprice). But with your LCD-X, the sound may be too clinical for your taste. A warmer/darker amp might make for a superior 'music enjoyment' experience. But if you want maximum detail and dynamics for a relatively low price, a THX amp would be ideal. As far as the DX7 Pro, it doesn't sit right with me that its headphone-out impedance is so high. (Using low-impedance dynamic headphones would be ill-advised.) I'd pass on this one. Another, above average all-in-one is sure to come around soon.
LuckyLuke575
561
Nov 10, 2019
mattrisA DX9 Pro $1,000 unit could be the next 'god' headphone DAC/AMP. Given how well Topping has been doing so far, I'm looking forward to what's coming next.
Ostewart
246
Nov 11, 2019
mattrisWell mine has arrived and so far so good. I am currently using some Campfire Audio Andromeda's with an OE 2.5mm balanced cable and Effect Audio 2.5mm > 4.4mm adaptor and there is ZERO hiss, that is impressive. Now with regards to the sound signature changing, there is a tiny (and I mean tiny) loss of bass when compared to a sub 2Ohm output impedance device, but that could also just be a change in sound signature between the devices, the DX7 Pro is coming across as a very clean, clear and precise DAC/Amp. The DX7 Pro works really well with the Andromeda, and I am really impressed with how clean the DX7 Pro is. On to full size headphones, using my HE500's with a balanced 4-pin XLR cable the DX7 Pro has no issues driving them in low gain, they sound really controlled and detailed.
Roseville
7
Nov 11, 2019
verifonixverifonix and mattris thank you both for the suggestions. The Monoprice THX AAA 887 is expected to be in stock on 11/14/19. Both of you mentioned THX amps so I have focused my search in this direction. Does it seem like a good match to you?
Roseville
7
Nov 11, 2019
mattrismattris please see the comment that I left verifonix, thanks.
verifonix
1181
Nov 12, 2019
RosevilleThe monoprice is a beast yeah. But I think it has delayed a couple times now, who knows when it'll be in stock. I personally bought the smsl sp200. It's in stock right now and on sale on aliexpress. I can't hear a difference anyway... THX = THX.
Roseville
7
Nov 13, 2019
verifonixThe 887 from monoprice is available as of today, for anyone interested.
verifonix
1181
Nov 14, 2019
RosevilleAh :D did you buy it, then?
Roseville
7
Nov 14, 2019
verifonixI bought two, just in case they sell out and you miss out and wanted one:) Just let me know. Where do you live btw? Again thanks to you and mattris for the guidance.
verifonix
1181
Nov 15, 2019
RosevilleNo problem! Looks like the monoprice is still in stock for now ^_^
Terrycinco
1
Apr 2, 2020
mattrisIf using Beyerdynamic DT770 Pro headphones with the DX7 Pro, which model of the headphones would you recommend? The 32 ohm, 80 ohm or 250 ohm?
TerrycincoWithout a doubt, get the 250 ohm version. As a general rule: If your amplifier has the driving power, always get the higher-resistance variant.
AnikiMu
2
Oct 8, 2020
MarutkIt works with Focal Clear, 55 Ohms.
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