I have two Ultra Hybrid EC's cus I have multiple devices to switch about to listen to. But the out of one pre goes to the in put to another so it's just another source to the final pre amp, yea yeah yeah I've heard all the claims of too many gazintaz to gazoutsa, affect the sound, not really, look at the chain of stuff in a recording studio, miles of wires switches. The AVA pre amps can handle anything as a load or source. You mean the phase INVERTERS? The final pre amp has two outputs it worked out perfect 2 phase inverters driving 4 AVA EXR and Insights I think, the low end ones have the double MOSFETS if I recall which versions they are now P500 HAFLER chassis. 2 inverters 4 amps each amp running in mono running 1200W+ no such thing as too many watts. It's not louder it's CONTROL, and it's AUDIBLE. Less amps and watts is anemic and thin, more current, more watts is full and LIVE! 4800+ watts RMS of AVA bliss. IT's ALIVE REAL and DYNAMIC! Legacy Whisper The LEGACY HELIX would need more amplifiers since it needs 3 per side tri amp'd ! Sonic realism takes another leap. Dream on...I don't think my floors can handle HELIX though. And neither can by bank account.