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I didn't know what to expect out of a $500 pair of electrostatic headphones, but decided to take the risk because of the reputation of Koss. Now that I've listened to them, I'm very happy I spent the money.
Others have criticized the quality of the materials (mostly plastic). But I would describe the materials and construction as 'adequate' and this is fine with me. Koss obviously spent the money where it counts and didn't waste it on materials that may increase the perceived quality.
The volume knob(s) are annoying. I wish there was a bit of friction holding them together so it wasn't so easy to mis-adjust the balance between left and right.
But the sound is wonderful and that's the important thing to me. I can overlook all the plastic and the knobs when I just close my eyes and enjoy great music.
I leave the energizer level at a fixed volume and use a preamp to adjust volume. Might be worth looking into. Adds to soundstage etc too!
I also had to cut a triangle out of the supplied sticker to serve as a volume indicator on the energizer :)
Shouldn't the input be line level? I'd expect distortion if putting amplified signal into the energizer.
replied to the wrong person!
Clipping. If the signal is amplified beyond it's specified range (line level) then the system may not be able to handle that amplitude. https://soundbridge.io/clipping/
Whats the optimal volume to avoid distortion?
PC USB 100%
AMP/DAC (Master Volume)
I really just want to set the energizer and forget it.
I have energizer at about 75%, PC full volume, foobar -22.5db. I also have an analog preamp that is what I use to control volume for different headphones, and compensate for different mastering volumes.
Foobar is safe to change volume, it doesn't affect sound quality.