Originally Posted by GIEGAR
How's it goin' Alan. That was a good question and I think it shows your instincts are good. Since you first posted a few pages ago enquiring about an XPA-5 or XPR-5, I've also been puzzling over why you're considering another power amp.
In case I've missed anything, this is what I've gleened about your situation: All Klipsch system consisting a Cornwall/Heresy front end (98 and 97dB/1W/1m sensitivity) and KB surrounds (90dB/1W/1m). You're adding four ceiling speakers (93dB/1W/1m) for a 7(?).1.4 Atmos system, correct? You already have a couple of NAD power amps and a Sunfire power amp.
I can't recall your room size, or more particularly your listening distance (if you've given it). I don't think you've indicated a preferred absolute maximum volume level (relative dBMV), but you've been working out power required for theoretical reference level (calibrated 0dBMV) program peaks of 105dBSPL per channel at the listening position. Please correct me if I've got something wrong or missed anything above.
Alan, the payoff for genuinely high sensitivity speakers is that you don't need a lot of power to drive them to very loud levels. For instance, at 98dB/1W/1m each of your Cornwalls only need 14dBW or bursts of power of about 25W to produce 105dBSPL peaks at a 13ft listening position. If your KB surrounds are say about 8ft from the listening position, they'll theoretically require around 19dBW or 80W bursts from the amplifier to produce a peak of 105dBSPL.
Unless your room is very large, and therefore having long distances to all speakers, or your listening preferences are to levels above 0dBMV (ie. VERY LOUD), your power needs would appear to be well within the capabilities of any top-of-the-line/flagship AVR that you'd be considering that are able to process 11 channels of Atmos audio simultaneously.
What models are your current NAD and Sunfire amps Alan? Some flagship AVR's (like the Denon) have almost complete freedom in internal amp assignments, so you can utilise your current power amps on pretty much any channels you see fit, and use the AVR's internal amps for the balance.
What you have gleened from my posts is correct; no need for corrections. I am still pondering the AVR/Pre-pro dilemma, and I take your point that if I buy an AVR I may not need more Amps. I have always tried to buy more power than I need, run the amps on low power, and avoid too much heat.
My present thinking, and I admit it changes almost daily, is to run the ceiling amps off the AVR if I buy an AVR which means I would need to buy four more channels.
If I get a pre-pro, I will first attempt to run the ceiling amps with the Pioneer 49TXI.
Here is the gear I have:
Evolving Audio system is Pioneer vsx 32(processor) and pioneer 49txi might be power for ceiling,
Klipsch cornwall (front) powered by NADC275BEE,
two Klipsch heresy (center) powered byNAD C275BEE,
two Klipsch academies (surround)powered by sunfire symphonic reference (might be future wide power)
two Klipsch kg RS-7 (rear surroundpowered by vsx 32).
Two Klipsch KSW-15 sub-woofers,
two Klipsch kg 1.5 to be used as front wide
four Klipsch SA-2 now mounted onfront/middle and rear ceiling (wired for two more)
70inch Vizio 4K
Theater room is 24 X 14 X 12 (ceiling)with two open walls on rear and left side.
Distance from front speakers to listening post is 12 feet.
Ceilings are 12 Feet high.
Right now, Denon and Marantz seem like logical avenues for pre-pro or AVR.
Sorry if I gave you too much information, however, if you need more, I am here.