What's the best approach to add Headphone Amp?


I have a wonderful 2 Ch system consisting of Audio Research CD7, Ref 3, VM220 Monoblocs and Wilson Sophias.
I'd like to add a great headphone amp as well for the times the rest of the house is asleep. My CD7 has both balanced and single ended outputs, with the balanced output connecting to the Ref 3. Should I use the tape out from the Ref 3 preamp to connect to the headphone amp, or is it preferable to use the RCA output from the CD7 while the preamp is off? Does anyone actually have experience with this scenario? Using the Ref 3 provides input switching, but also adds a lot of additional circuitry when compred with a straight run from the CD player to the headphone amp.....Suggestions appreciated.
jdolgin
The specifics of going direct from the CD7 is that the balanced interconnects would be in place, connected to the preamp that is not powered up AT THE SAME TIME AS THE rca interconnects were running from the single ended output into the active headphone amp.
Do you see this as a problem?
No, not a problem.I use a Grace M902 direct from an Audio Aero Capitole Mk II (balanced outs from the cdp into the Grace) and at the same time have the cdp hooked up to a preamp via the rca outputs. Sounds great.
To my understanding to reach the best performance running directly from the source to the headphone amplifier you should find one with balanced input and balanced bypass so you use fully balanced signal path among your components, but running as you've stated AT THE SAME TIME... isn't a problem.
Grace Design M902 that had been already mentioned is one of the best contenders. You might even want to use it as a preamp vs. the one you currently have.
I use a balanced headphone amp plugged into the 2nd balanced output of the preamp...the 1st balanced output goes to my balanced amp for the speakers. When I use the headphone amp, I do not power up the amp for the speakers. When I use the amp for the speakers, the headphone amp is off. I can use both at the same time, but never do.
Could be silly question, but anyway. Should the amplifier have speaker off button in order to listen to music through headphones? Otherwise, the sound will be heard both, through headphones and through speakers. Or Am I wrong? Never had headphones amp. Sorry for hijacking the thread.