Massdrop x Koss ESP/95X Electrostatic System
Massdrop x Koss ESP/95X Electrostatic System
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Product Description
A revival of the standard-setting ESP/950 released by Koss in 1990, these headphones bring electrostatic quality into a whole new price bracket. Initially designed for live recording, the ESP/950 came with a large carrying case and a battery pack to power the required energizer: a special amplifier for electrostatic drivers Read More

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Buckaboo
124
Aug 2, 2020
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I am selling my Koss ESP/95X. Message me if interested. Located in Sacramento CA. Works perfectly. Dave5008@gmail.com
(Edited)
Aug 2, 2020
Jimmyblues
27
Aug 3, 2020
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How much are you asking? 120 volt version?
(Edited)
Aug 3, 2020
Offramp
36
Jul 30, 2020
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I thought about buying this but had bought Stax limited edition headphones earlier. This purchase caused me to do some hard research on this 950 setup. DROP.... We need you to present us with a high quality electrostatic amp. I looked over in the forums and could find nowhere to drop this line. I’m talking about a great deal on a Woo, WES. Maybe a KGSSHV Carbon cc??? Blue Hawaii??? Drop, we know you can do it. You hit with the V850 and I stepped up bought. How about a nightcap...
Jul 30, 2020
NeoTheLizard
107
Jul 6, 2020
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Holy mother of fuck I am going absolutely insane. I thought, throughout my about 3-4 months of owning these, I had heard the worst of that infamous "something stuck in the driver"-squeel. Minor annoyance, not super audible above music and video game audio, just tap the earcups for a while, it goes away after a bit. No problem. Turns out, I've just barely tasted how ungodly bad this issue can get. Holy shit, is it loud. Holy shit, is it uneven and squeely and obnoxious as all hell. It gets even worse when I tap the earcup, it's been there for more something like three days now, intermittently, sometimes becoming barely noticeable for a while only to suddenly come back at full force. This is causing me physical discomfort. I'm getting headaches, which in turn cause me to develop mild nausea. It's like having a mosquito inside your ear that just starts to get louder and more obnoxious when you try to make it shut up. I almost want to fucking break something just to make it stop, though naturally, 400$ plus import is a powerful deterrent indeed. Jesus Christ. Can't find anything visibly stuck, I pulled off the earpad of the offending right earcup, just in case, but no, nothing. Do I really need to ship these back to the U.S. now for repairs? I live in Denmark, so it's probably going to be a tedious experience, and I can only hope the cost of shipping won't be a problem. I love these things, they sound fucking great. They're really comfortable. They would have been a five stars for me if I hadn't been fearing exactly this shit the entire time I've owned them. But boy oh boy, is this issue driving me nuts these days. And very close to regret.
Jul 6, 2020
MarcelMatzenauer
2
Jul 8, 2020
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It is very inconsistent. Sometimes it happens only on the right or left side, sometimes on both at the same time. It rarely responds to tapping. I think it is an electrical issue.
Jul 8, 2020
A-Hao
21
Jul 24, 2020
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hey pal, I got exactly the same situation as yours just two days ago. Does anyone here know how to resolve this problem?
Jul 24, 2020
mmatzenauer
29
Jul 2, 2020
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Have anyone used other external power supply than the stock one? I am thinking of buying the iFi iPower X for the energizer. I use it for Airist RDAC and it brought noticable impovement in clarity and detail retrieval.
Jul 2, 2020
Khermush
14
Jun 26, 2020
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So I bought mine in Dec 2019 and was enjoying them since. but 2 days ago, the left channel started producing a strange coil whine which temporarily goes away but comes back again. I Opened a ticket 2 days ago and I'll hopefully get an answer soon.
Jun 26, 2020
Greg_Dunn
14
Jun 10, 2020
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OK, I just received these and the sound is excellent - even better than my ESP-9 (still working OK even after 40 years). There's one thing which is a little bothersome about them, though; these seem to be designed for someone with an enormous cranium. The headband and the ear pieces just seem to be far too large . Even if I shorten the headband to its absolute minimum, the earpieces hang below my jaw by a noticeable amount, the cavities are huge and there is a gap below my ears large enough I can put my finger clear through, from the lower rear portion. They're also barely tight enough to stay on; I had to bend the headband to put enough pressure on the earpieces to hold them against my head without sliding. I have a pair of the Sennheiser HD58x and they not only fit snugly over the ear, but there is still a considerable amount of slack in the headband, which is puzzling. In fact all of my other phones accommodate my head easily. This seems like an odd oversight for an expensive pair of phones. Some of this could be ameliorated if I had ear pads which were substantially thicker and had smaller cavities in them, but the only ones I see when doing an online search are much the same size and shape as the ones which come with the phones. Am I the only one who has this issue?
Jun 10, 2020
Greg_Dunn
14
Jun 10, 2020
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NP. I hope to write a proper review after a few days/weeks of acclimating to them and comparing to my other phones...
Jun 10, 2020
pyrobunny
280
Jun 23, 2020
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Maybe try adding something like Dekoni Nuggets? Might help with the headband sizing!
Jun 23, 2020
thisisalloneword
2
Jun 4, 2020
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Seem the 120V is on sale for $400, but when I click buy it shows $450 .
Jun 4, 2020
tvr2500m
92
Jun 5, 2020
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I just checked that out and saw the same thing. Select the 120V option, the price indicated is $400, then click Buy and $450 shows up in checkout. ??
Jun 5, 2020
Exya
14
May 17, 2020
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Is there a way for Drop to email/notify me when the 120v variant is back in stock? Thanks
May 17, 2020
the0nefreeman
6
May 27, 2020
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Don't know if you've seen it yet, but the 120v is back.
May 27, 2020
dbrunell
14
May 14, 2020
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I've wanted a pair of these for years. I am not disappointed. I listen mostly to classical, so clarity and accuracy is more important to me than wildly-accentuated bass. They have better clarity than my ATH-AD900X and firmer bass than my DT-880. I don't mind the dual volume control, but I painted a couple of lines on the knobs to make it easy to line up the gain. I also added some woodgrain treatment for a retro look. The short cord is nice because I'm always getting longer cords tangled up in my chair, and an extension is included anyway. The stand is a "Tekline Asona." It comes with a dust cover, which I understand is important for electrostatics.
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May 14, 2020
thisisalloneword
2
May 19, 2020
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Nice. How did you add the woodgrain? Where did you get it from?
May 19, 2020
dbrunell
14
May 20, 2020
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It's just self-adhesive vinyl that I had left over from a previous project. I think I got it on Amazon--you can search for "wood grain vinyl" and choose the shade you want. To apply, I first removed the rubber feet from the bottom and thoroughly cleaned the case with isopropyl alcohol. I started applying the vinyl on the bottom and wrapped it over the top and back around to the bottom, leaving the seam on the bottom. I put it on oversize and trimmed the excess by running an x-acto knife along the front and back seams. Real wood veneer would have been better, but you'd have a devil of a time curving it around the case edges.
May 20, 2020
johnpaulgeorge
1
May 14, 2020
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I am encountering a hum at all volumes when source is connected through RCA. I am not getting any hum when connecting source through the front 3.5mm audio input jack with a double ended 3.5mm cable. When connected through RCA and humming, I can touch the 3.5mm jack with a finger and the humming will stop; likewise, if I put a hand on the source's metal casing, the humming diminishes/stops. I'm getting same results passing through an amplifier, as well as directly from the DAC. This makes me think it is a grounding issue - does anyone know a good fix for this?
(Edited)
May 14, 2020
johnpaulgeorge
1
May 18, 2020
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Hmm interesting, I have the issue on my desktop (no laptop for comparison). For the setup without hum - I have a USB cable from tower to a Schitt Fulla (using its DAC) to provide power and audio source, then a 3.5 mm cable from Fulla to the front 3.5mm audio input jack of the Koss energizer. For the setup with hum - I have an optical cable running from tower to Modi 2 DAC for audio source, then RCA cables to back of Koss energizer. I have also tried passing through 2 different amps and still have the hum. In both cases I have the energizer wart plugged into a power strip. I have tried moving the energizer to different spots but this seems to have no effect.
May 18, 2020
NeoTheLizard
107
May 18, 2020
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Wow, that is really strange. I would have imagined that keeping signal and power separate by using optical or coax would significantly reduce the likelyhood of issues like this happening, but now I'm even more confused as to what is causing it than ever before. In the case of the laptops I have the hum on, both were being connected to power sources while they had this problem. The one that belongs to me is almost 7 years old and won't last a minute using the battery, so leaving it unplugged is out of the question. I'd imagine it to have something to do with the construction of the motherboards as well as the the power being fed to all the related equipment, but my practical knowledge of how these things work is pretty limited. It is kinda annoying that I can't use the system with my laptop without this issue, though.
May 18, 2020
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