[null]

I've heard that you can make your own 4P-4S ety cable... how would i go about doing this?

 

[DJGeorgeT]

Read this link

All you need is two 75-ohm metal-film precision resistors and a radio shack volume control. In essence, the P to S cable adds 75 ohms on the left and right earphones.

G

 

[null]

thanks a lot

 

[null]

actually, i'm having a little trouble understanding xin's directions, they arent that clear...

 

[MechanicalMan]

DIY

 

[Elec]

You buy a volume control from Radio Shack, take the pod apart, then cut out the little board or wheel. You'll have 3 wires in there for each half: left, right, and ground. Ground is probably uninsulated twisted copper. You can just connect the ground wires directly. Put a quality 75 ohm resistor in between the left wires and the right wires on each half (so like white from one half -> 75 ohm resistor -> white from the other half). Add some hot glue or electrical tape or something to prevent shorts, stuff it back in the little pod, and close'r up. Done.

 

[null]

thanks! with xin's pics and your explanation i understand now. it'll be a good little first solder project.

 

[TonyTripleA]

Hi Null,

Hopefully you got my PM with my clutzy method of doing a cable adapter. Its not beautiful, and doesn't go to the trouble of using a case like Xin, but just cut and solder and insulate well...

Cheers,

TonyAAA

 

[Elec]

Also, if you're not sure you want the S value exactly and you have a multimeter, you can buy a RS volume adapter, dial in the impedance you want, hook up the Etys, and take a listen. Then if you prefer X (25 ohm resistor), for example, you can order quality resistors in that value to permanently mod into the case.

 

[TonyTripleA]

What a good idea elec. Damn wish I'd thought of that! Did you find you prefer a particular impedance yourself?

TonyAAA

 

[JaZZ]

I prefer the sound of the X version -- 20-40 ohm in series to the ER-4P (the picture shows an adapter with 2x 27 ohm).

Additionally I am enthused by a passive EQ network inspired by Siegfried Linkwitz, in the case of my modded Etys reduced to one circuit with the values R0: 20 ohm / L20: 2.25 yH / R20: 15 ohm / C20: 225 nF -- applied to the ER-4P. Still in the prototype phase, but sounds great!