Yes, I agree. Inside the Y-splitter would be my preference as well.

Thanks for finding these schematics. The top image of a P-S-B switchable adapter looks like it was designed to be used with an existing 4P cable, however the 'B' circuit shown uses only a capacitor (680 nF) rather than a series resistor and capacitor in parallel with the 73 ohm resistor. That...

Yes, it seems like this might also work. Maybe time to play around with some analog circuit simulation.

Yes, my understanding is that the ER-4P cable has a built-in 27-ohm resistor while the P-to-S adapter adds another 75 ohms in series to make it equivalent to the 100 ohms resistance in the 4S cable. Based on the Etymotic patent, it appears the original 4B filter network is a 100 ohm series...

I've checked the usual places and can only find P-to-S adapter cables.

Does anyone know where I might find an adapter/converter to convert an ER-4P into an ER-4B?

Yes.  I'm using a Power Bright VC100J transformer.  (And I did check even that to be sure it was actually providing ~100 Vac.)

SRM-323s failure   Just wondering if anyone else has experienced a bad 323s?  I recently bought one from PriceJapan and it seemed to work okay the first couple of times I tried it but soon starting cutting out in the right channel after a few minutes of use.   I measured the DC voltage on...

Quote: I have this window that pops up when connected to the internet via dial up. It says svchost.exe has generated errors and a log will be generated. I had this same thing happen, and it turned out to be a symptom of being infected by the msblaster virus. You can check this by...

Quote: Very few opamps have constant open loop gain in whole audio range. AD8610 is the only I know of Aos, are you sure about this? I looked at the AD8610's datasheet, and while it doesn't specifically show the open-loop gain over the audio range, it otherwise doesn't seem to suggest...

Quote: On the minus supply opamp a .1 [uF] from pin 2 to ground is almost always necessary. I experienced oscillation in the minus supply opamp after I tried adding some small local decoupling capacitors to the main amplifier board. The supply returned to normal after I removed the...

Quote: the 66 IS either a 63 or 56 , just that the package is an OEM part According to icmaster.com (an online IC parts search database) these are all separate Burr Brown (now TI) parts. The PCM56 and PCM66 are listed as 16-bit devices, with power dissipations of 260 mW and 50 mW...

Quote: i would have guessed the prehead would have enough power to drive the akg1000? With a maximum output of 13 V at 800 mA, the PREHEAD shouldn't have any problem driving the AKG-1000s.

Quote: A max output of only 5mW at 16 ohms?? Man, is that low! And, like redshifter said, it will be half of that or slightly less for 32 ohms. This is only true if you assume that the given power rating reflects both the player's maximum current and maximum voltage output...

Quote: I have quite a lot of Sony kit and without exception, the sound from their headphone sockets are quite dire. It's certainly true that the sound from the headphone outputs on most equipment is unlikely to meet with the approval of discriminating audiophiles. However, while I...