If you are getting the ZO v. 2, you could use the P-to-S adapter because the v.2 has an amp section. The ZO v.1 does not, and the P-to-S adapter might add too much impedence to the ER-4P, and without sufficient power, it won't sound its best.
If you are getting the ZO v. 2, you could use the P-to-S adapter because the v.2 has an amp section. The ZO v.1 does not, and the P-to-S adapter might add too much impedence to the ER-4P, and without sufficient power, it won't sound its best.
That is no correct, at least not with ZO1 and ZO2.3, ZO1 does have an amp section, but with fixed gain (6dB IIRC) and no volume control. That is the only reason why you can't connect it to line-out directly as the volume will be too loud and has no way to control it. It has nothing to do with impedance. In fact, ZO1 has more power than ZO2.3.
^ Well, I must have read some of the ZO threads too quickly, and associated the volume addition to the v.2 with addition of a stronger amp section -- my bad.
That was exactly my idea, buy the P-to-S adapter and then an amp since my source (SGS with Voodoo Sound) probably won't be able to drive with the S adapter. Also I need an amp to connect to headphones out since I don't have line out. The ZO does that right?
Where can I read more information about the ZO2.3?
Edit: nvm I found it
Thanks guys.
Hi. Can somebody please compare with custom IEM's? I got my new Heir 4.A customs, which should be flat and neutral, but I find them muddy and with lack of heighs. I need something more airy... What should I do ? :( Would be ER4S or P good for me? thanks.
If you want a custom ER4S, get the UERM.
Unique melody Reference monitors? $999? That's absolutely out of my budget.
DBA-02 mk1/mk2, B2, CK10, ER4S. You will want a deep fit with those like a good deep custom would be. If you can't then you'll get bright and lean.

I have the 4.A as well; I think you might just not be used to the sound, or you may have problems with the fit. The 4.A's frequency response is modeled very closely after that of the ER4S, so if you do have a good unit of the 4.A, it won't sound much different from an ER4S.