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75ohm resistors in ksc75?

post #1 of 28
3/11/08 at 2:33am
Thread Starter 
so whats the story behind this 75ohm resistor mod?? i read a little about in some threads, but not too much.. i've searched for some more info but can't find much.. so anyone care to explain what this mod does, and how it is done? thanks
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post #2 of 28
3/11/08 at 3:44am
Quote:
Originally Posted by ueyteuor View Post
so whats the story behind this 75ohm resistor mod?? i read a little about in some threads, but not too much.. i've searched for some more info but can't find much.. so anyone care to explain what this mod does, and how it is done? thanks
The mod is to put a 75 Ohm resistor across +/-. This makes the headphones harder to drive but tightens up the low end quite a bit.
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post #3 of 28
3/11/08 at 2:01pm
Thread Starter 
so a 75ohm resistor in both drivers?
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post #4 of 28
3/11/08 at 3:26pm
Quote:
Originally Posted by ueyteuor View Post
so a 75ohm resistor in both drivers?
Unless you're trying to mod only one driver, yes
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post #5 of 28
3/11/08 at 5:12pm
Quote:
Originally Posted by FallenAngel View Post
The mod is to put a 75 Ohm resistor across +/-. This makes the headphones harder to drive but tightens up the low end quite a bit.
i have always put the resistor in series with the driver.

i never tried parallel.
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post #6 of 28
3/11/08 at 5:35pm
Anyone got a photo of the mod in place?
Thanks
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post #7 of 28
3/11/08 at 5:51pm
Quote:
Originally Posted by nikongod View Post
i have always put the resistor in series with the driver.

i never tried parallel.
Funny, I always put it parallel, never in series.

There should be a few photos around, just use a small 1206 SMC resistor, it's easiest (at least for parallel method).
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post #8 of 28
3/11/08 at 6:43pm
Adding a resistor in parallel won't do much but draw more current from the amp. It is normally put in series with the driver to create a voltage divider with the resistor and the driver, and does two main things. First is it attenuates the output, helping to deal with any hiss created by the amp (you have to increase the volume of the input signal, but the amp's innate noise level stays the same, thus improving the SNR), but it won't do anything for hiss created by the source. Second is unless the headphones have the same impedance across all frequencies, it'll have different levels of attenuation depending on the impedance at that particular frequency, which for most phones creates a bass boost effect.
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post #9 of 28
3/11/08 at 11:35pm
Thread Starter 
ok wise guys.. what's this talk about parallel and series? i have no idea what you guys are talking about..
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post #10 of 28
3/11/08 at 11:56pm
they are terms describing the juxtaposition of various electrical components. do a search.
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post #11 of 28
3/12/08 at 12:28am
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post #12 of 28
3/12/08 at 12:32am
Thread Starter 
i see, so its basically the resistor on the positive only, on both drivers..
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post #13 of 28
3/12/08 at 2:37am
Quote:
Originally Posted by ueyteuor View Post
i see, so its basically the resistor on the positive only, on both drivers..
Actually, I think the mod sounds better with the resistor in the neg. lead. YMMV
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post #14 of 28
3/15/08 at 6:15pm
How about using an ER4 IEM adapter, like one of these:

Would that have the same effect or am I barking up the wrong tree?
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post #15 of 28
3/15/08 at 7:26pm
Quote:
Originally Posted by omega52 View Post
Actually, I think the mod sounds better with the resistor in the neg. lead. YMMV
i use 2 equally sized resistors on each side. this way i dont have to decide.

Quote:
Originally Posted by spookygonk View Post
How about using an ER4 IEM adapter, like one of these:

Would that have the same effect or am I barking up the wrong tree?
if its the etymotic p-s adapter, rock it.
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