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post #331 of 512

Help please!

I really don't know what I've been doing wrong, but ouch.... there is way too much treble after the mod I did:

- Received the ksc75 with the inline volume and drilled the diaphragm as nearly the same as bixby's (see pic in post above). At this point I didnt heard big changes.

- So I recabled with spc and now the sound has too much treble. Voice faded in the backgoung and I hear treble effects in it wich is really annoying.


What did I do wrong??? Is that:
-I should'nt have put them in a earcup?
-I should'nt have use spc (I heard that good copper cables are preferable for the KSC75)?
-I should'nt have drill the plastic at all?

Is there a way to correct that faulty sound?

Your opinion would be greatly appreciated.
LL
post #332 of 512
Quote:
Originally Posted by cantaloupe View Post
I really don't know what I've been doing wrong, but ouch.... there is way too much treble after the mod I did:

- Received the ksc75 with the inline volume and drilled as nearly the same as bixby (see pic in post above). At this point I didnt heard big changes.

- So I recabled with spc and now the sound has too much treble. Voice faded in the backgoung and I hear treble effects in it with is really annoying.


What did I do wrong??? Is that:
-I should'nt have put them in a earcup?
-I should'nt have use spc (I heard that good copper cables are preferable for the KSC75)?
-I should'nt have drill the plastic at all?

Is there a way to correct that faulty sound?

Your opinion would be greatly appreciated.
From the way you have this explained, it seems the recable is what corrupted the sound. If this is the case, I doubt there would be a satisfactory solution except for replacing the cable again. If I recable my KSC75, it will be with an HD580 cable. But after reading about your experience here, I doubt that I ever will.
post #333 of 512
Quote:
Originally Posted by 1Time View Post
From the way you have this explained, it seems the recable is what corrupted the sound. If this is the case, I doubt there would be a satisfactory solution except for replacing the cable again. If I recable my KSC75, it will be with an HD580 cable. But after reading about your experience here, I doubt that I ever will.
Recable did improved the sound but not not as I would have thought. There is a member here, pcwork, that did try a lot of styles of cables and said that 6n pure copper is what improves the most the SQ for the ksc-75.

I might try copper but it'll definitly be the last try. IMHO maybe if you have the headphones without the inline volume, you should not really bother with recabling your KSC-75. Or if you want to use it along a head amp, they're a lot of people that said using a resistor does improve the sound quite a bit...
post #334 of 512
I'ved owned 2 KSC-75s, first was the non-inline volume control one, which I've Kramered/recabled with Mogami. Burn-in did remove a bit of the treble harshness.

My second one was the in-line volume KSC-75s, and for some reason there is some VERY BAD distortion. I've recabled it with the non-volume control cable from the previous KSC-75, which got rid of it, but it still exists. I'm thinking its the driver, perhaps they were fed too much power and the drivers were damaged.

Does anyone else have this issue? I think I'll just warranty these suckers

EDIT: definitely agree that in-line volume cables are begging to be recabled, however I think the cost of 6n copper isn't justified as it'll probably cost x4 the amount of the phone itself
post #335 of 512
I got new pair with volume control and it sound nothing like a KSC-75 i owned earlier. This new pair sound tiny, toyish, just very bad. No comparison with PX 100. The old pair of KSC-75 easily outperformed PX 100.
BTW, i recabled them to get rid of volume-controlled cord, but still it sounds like sh*t. Obviously Koss ruined the great headphone lately.
post #336 of 512

What gauge SPC did you use?

Gauge could be the problem as well as burn in. But from the other posts about the inline version, I am a bit worried, maybe there is a driver difference. If I were you, I would try some multi strand 30 gauge copper wire and see if that improves the sound. If you used SPC that is 18-20 then that may be the problem. Highs will get there because of skin effect but you may have too thick of wire for the mids and lows to get there with the small voltages in most players. Just a thought since it works this way with interconnects.
post #337 of 512
thanks op, gonna be trying this mod when i get the time.
post #338 of 512
Quote:
Originally Posted by bixby View Post
If you used SPC that is 18-20 then that may be the problem. Highs will get there because of skin effect but you may have too thick of wire for the mids and lows to get there with the small voltages in most players.
I used 26 AWG spc. Can you please elaborate on skin effect.
post #339 of 512

Skin effect

Skin effect in wire is the tendency for high frequencies to travel on the outer portion of the wire or the skin. The high frequencies travel here where mids and lower freqs travel through the core if you will. So with low level voltages in wire you don't want anything too thick or it may be treble prevalent. That being said, 26 gauge is certainly in the optimal range for what you are doing.

I think what you are experiencing has more to do with the model with the inline v control. Especially form the other comments about it and the mod. You may wish to invest in a "normal" pair and try that. You'd only be out $15 or so.

Good luck.
post #340 of 512
i hear buzzes and distortion from my modded left driver (the right one hasnt) any idea what happened?
post #341 of 512
Probably knicked the driver. Open it up and see if there is a wrinkle. If there is get a straw and suck that sucker back to normal.
post #342 of 512
I tried doing the mod and when I had to cut a circle in the KSC75 pad, I cut it too much. So I thought of buying new cushions from the KOSS website (5$). If I'm already buying new pads, I thought why not just buy new KSC12 cushions. Unfortunately, I'm not able to find KSC12 pads in the KOSS website and not even on eBay.
Please help me!
post #343 of 512
Quote:
Originally Posted by cantaloupe View Post
Is there a way to correct that faulty sound?

Your opinion would be greatly appreciated.
Ok I resoldered everything and the problem was hidding there. Now the sound is balanced.

But I did some A, B comparaison test with an original ksc75 (with inline volume) and IMHO the recabling does not really worth it. But I must admit that I did not use a amp to make the test because I want to use these phones for running purpose.

Maybe the recabling results would have been more revelant with a headphone amplifier.
post #344 of 512

What was the problem?

Cold solder joint or a driver issue? Or something else?

glad it has worked out, though. I am enjoying some Goldfrapp right now on mine which are a new pair that was cooking for a few days. Will do my foam circle mod in the next few days.

Sounds really nice right now. I failed to mention that since I am on a new pair that they sounded very different from my several years old pair. Burn in for lots of hours is a must to smooth them out, IMHO. I still have a way to go on the new ones to get to the smoothness of my well burned pair.

cheers
post #345 of 512
Quote:
Originally Posted by bixby View Post
I failed to mention that since I am on a new pair that they sounded very different from my several years old pair. Burn in for lots of hours is a must to smooth them out, IMHO. I still have a way to go on the new ones to get to the smoothness of my well burned pair.

cheers
Thanks for the input, burning will be the next -logical- step
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