[busyx2]

Hi,
I don't know what I've got now...

When I measure with a DMM, I found 100-ohm impedance on the earphones, is this a P or S?

 

[silkeborg]

Sounds like you got the ER-4S. The P version has got an impedance around 26ohm or so, and then when you add the resistor cable of 75 ohm you have the S.

 

[busyx2]

Hmmm, can I parallel a 36 Ohm resistor to turn the 'S' into a 'P'?

1/100 + 1/36 = 1/27

 

[silkeborg]

Aren´t you just adding more resistance to them?

 

[TacticalPenguin]

you cant go S->P but you can go P (26ish) -(+75)> S (100ish)

you have S and cant go to P without a new cable

 

[silkeborg]

Quote:

Originally Posted by TacticalPenguin /img/forum/go_quote.gif you cant go S->P but you can go P (26ish) -(+75)> S (100ish) you have S and cant go to P without a new cable

That´s what I thought as well

 

[dan1son]

Quote:

Originally Posted by busyx2 /img/forum/go_quote.gif Hmmm, can I parallel a 36 Ohm resistor to turn the 'S' into a 'P'? 1/100 + 1/36 = 1/27

Technically you "could" do that, but you'd have to take apart the headphones and splice out the existing resister and add one in parallel with it there. Might as well replace it if you're doing that kind of surgery.

I wouldn't recommend it for obvious reasons

 

[busyx2]

No, what I meant was to parallel a 36 Ohm resistor at the input plug.

Since the driver is in series with a 100-Ohm resistor, then in parallel with a 36 ohm resistor:

(100 Ohm + Driver)//36 Ohm = 27 Ohm

No need to take apart any cable, just solder to the plug, or an adapter.

 

[busyx2]

Quote:

Originally Posted by dan1son /img/forum/go_quote.gif , but you'd have to take apart the headphones and splice out the existing resister and add one in parallel with it there.

Since the Knowles driver is practically 0-ohm, I can parallel the resistor at the input plug, instead of // on the 100-ohm resistor. Hope this make things clear. In fact, I've already tried, and it seems to sound more transparent.

 

[silkeborg]

Have you measured the total impedance after you paralled the resistor, how did the output level sound afterwards, more or less?

 

[busyx2]

I did not use a test-tone, but I have to dial up the volume slightly.

 

[silkeborg]

Still sounds like you have have added additional resistance to it, adding the impedance cable to the P-version gives
it a more clearer or transparant sound, but also means you have the increase the volume to receive or hear the same output