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Koss ESP/950 electrostat thread

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8 minutes ago, spritzer said:

You can also just use the extension cable that came in the box.  :)  

Also the angled earpads were a custom order from Vesper Audio.  Fong carries the normal flat pads but it is easy enough to order the custom ones from Belarus. 

How much do these angled earpads go for? Now I need to look through all of my cables boxes to see if I still have that koss to stax adapter.

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I was comparing Koss to Sony ECR500 and Sony surprisingly still sounds very good. I would say not as good as Koss, but very liquid with lower end authority and good soundstage, and this is with default "sweaty" pads. This makes me think that new pads on Sony will make them sound better and make them that much more comfortable. Anyone know how if someone makes pads for ECR500? Maybe Vesper Audio can do make them? I think SR-007 style pads would work. Spritzer, did you ever swap pads on ECR500? What style worked?

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I never messed with the earpads on the ECR-500 as it was really before all that started.... 

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Now for something pretty rare... the ESP900... 

DSC00115-2.thumb.jpg.2606a8095fa69470d76b16c1d9fe0003.jpg

This is the closed back version of the ESP950 made for medical use such as MRI's etc.  Not much is known about these and only a few sets have ever surfaced.  I'll do a more indepth post about these when I modify them and dig into them a bit.  Stock...well...they don't sound good.  The earpads are unique to these so when you press them to the head...the sound gets better but it is no 4070...that's for sure. 

DSC00116-2.jpg

DSC00114-2.jpg

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Currently, yes.  Well if these are even still sold which is rather hard to confirm.  They do sound like crap though.... 

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I recently impulse bought a set of the 95x on EU blowout ($290 all in, which includes 20% VAT so that's a little ridiculous) - regretted the compete waste of money from the moment they said they wouldn't cancel the order until these things arrived earlier today. I've always been a QUAD fan, but found the STAXs in my budget to be ear-shreddingly shrill so really didn't know what to expect. So far, what a lovely transducer! Now I'll have to go back and read through this whole damn thread before asking annoying questions...☺️

By the way, does anyone remember the dynamic headphone that KOSS sold for a while years ago that used the exact same enclosure? I had a pair briefly in the days where head-fi was part of my life (!) and remember finding it extremely smooth and friendly to my ears. Then in a childish moment of idiocy I 'dismantled' them 'for the benefit of the community' and that was the end of that. But, sonically, goes to show how much of an effect the enclosure has on the sound.

Edited by TheSloth

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Crap, I missed that sale as I would have bought 10 sets...  :)  

I think the dynamic Koss set was A/250 but I could be wrong

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22 minutes ago, spritzer said:

Crap, I missed that sale as I would have bought 10 sets...  :)  

I think the dynamic Koss set was A/250 but I could be wrong

That's the one! I liked that headphone.

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Has anyone actually verified the Bias out of the E90?   Some say it is only 300 V versus some saying 600 V (which is what is stated by Koss).

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The specs from Koss are clear plus the bias is directly off the B+ so 600V.  There is a spot there for a voltage divider with infinite value resistor (i.e. open) from the factory which they can then engage if the squeal becomes an issue.  

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Yes but I've never seen them do that.  They usually take it down to 500V or so.

That 300V value does smell a lot of somebody measuring the bias at the output socket...

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