Quote:
Originally Posted by
kmhaynes 
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.