Your room is large but I don't think you will be seated further away than 5m from each speaker nor will listen louder than 100dBSPL at the listening position. Salon2 is
rated by Revel to have a sensitivity of 86.4dBSPL with 2.83V @ 1m (2 π anechoic). This means in order for two of them producing 100dBSPL @ 5m, each speaker needs 34V, which translates to 144W in 8 Ohm, not a huge amount of power but a huge amount of SPL.
There's few discrepancies in your 100dBSPL calculation that all together add up significantly, imo.
First is
@aliqaz has said he listens at 20ft or 6.1m, not 5m. Second is the Salon2's nominal impedance is 6 ohm, not 8 ohm.
Third is I see you attributed two speakers to provide a full +6dB summation....which is very unrealistic ime. +3dB is commonly used for this.
So all those together add to needing about 58V and 570 W per speaker, not 34V and 144W.
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But I think the far bigger issue, is that this type of calculation is for AVERAGE SPL, and AVERAGE POWER.
In #209, Duke linked an in-room SPL calculator
http://myhometheater.homestead.com/splcalculator.html#anchor_13193
It makes the same type calculation.
Here's a screen shot of that calculator using the Salon2 with the numbers i posted above.
(Note stated 86.4 sensitivity has to be adjusted down by -1.2dB, because Revel used 2.83V which is 1.33W, not 1W, into it's nominal 6 ohms.)
It is a calculator for finding
maximum average SPL at the listening position, using the speaker's sensitivity , amplifier wattage, and distance.
It has no consideration of headroom needed for producing uncompressed peak signal.
If the amplifier wattage includes it's entire headroom available (which is a spec that's very hard to find on almost any amp because it varies by time duration).
the calculator would give peak maximum SPL...the headroom needed for transients above average SPL.
Generally, I've found it's not safe to assume there is more that +3dB amp headroom above rated wattage. Very good amps may have +6dB. Extraordinarily excellent ones perhaps higher.
How much headroom is needed?
I saw Duke in same post say he likes +8-10dB (Personally, I'm a clean-headroom junkie, and like +18dB..we will ignore me
)
Let's just go with a +9 dB needed.....which equates to 8x the 570W power already in the average calculator. (2^3rd ...a doubling for each 3dB)
Yikes ! 4560W for clean headroom.
Ok, so we're clearly in fantasy land....
Let's go the other way, lets try to input the max unclipped amp wattage we can reason out for a 570W amp (not for from the 600W
@aliqaz mentioned used for the current Revels)
We could just divide the 570W by 8 to give room for peaks, which would give about 71W; but lets be generous to the amp and say it has +3dB honest headroom.
So, only need to dived by 4 for 142 W,
Now we have 94dB at listening position....but this is transient peak SPL,
and we need to subtract the +9dB it has over average SPL.
To get to a max average 85dB at LP, unclippled by amp.
Ok, take all this with a grain of salt...it doesn't account for room contributions, it's a spitball guess about amp headroom, and what sensitivity is across the spectrum.
And who knows if
all the driver sections are able to maintain linearity, at the now implied 1m 98 dB average, and 107 dB peak.
My guess is they all can, other than the three 8" subs petering out at very low freq,
Not bad at all.
Not what I'd call good though. Especially given only +9 dB was used for transients.
If you want to allow for more clean headroom, just subtract that number from whatever the in-room SPL calculater gives (using rated amp wattage) to get maximum average SPL at LP.
Hope this was of some help to any trying to wrap their head around,what does it really take to turn up the volume without hearing strain.
