DR_JB wrote: How do you have it wired?
Could a similar setup be achieved wirelessly, between headphone amp and 990?

The Zone 2 output feeds an old Sanyo preamp and a Crown D40 Amp. Each occupies 1 RU in a 19" rack. The STAX power unit is fed from the speaker outputs of the Crown D40. The Stax phones would plug into the stax power unit (for want of a better name). This is all in my rack cabinet. I actually have a STAX extensio cord plugged into the power unit and have the phones at my chair. (Wife puts up with this and has never given me grief ).

Re: Wireless. The only experience I have with wireless is that I bought a wireless unit from Radio Shack. It is used so the wife can listen to TV in the bedroom and let me go to sleep. It is fed from line-level outputs on the TV. So this ought to work from ZONE 2 outputs which, I believe , are at line level.

If you want you can send me a PM with phone # and I'll call you.