100W, 200W, or 300W?

Power specification is very vague.  Average music power delivered to speakers (dissipated heat) is very low, unless one listens to sinewaves (then it is 50%).  When music sounds about half as loud as the music peak it is 10% of the peak power, not to mention gaps in music or soft parts.  I would speculate it is only a few percent of the peak power - more for heavy orchestral pieces and less for Jazz trio.   Perhaps 100W amp can deliver as much of the peak power as 200W amp, but is specified at 100W only because of the, for instance,  smaller heatsinks.   Both might sound the same with some types of music, like mentioned Jazz trio.  According to FTC power should be measured as sinewave RMS voltage at specified frequency range and rated THD, over specified impedance for period of 5 minutes, when amplifier was preheated at 1/8 of rated power with 1kHz signal for one hour.  It would imply that amplifier rated 200W has to supply this power for only 5 minutes and after that can overheat.  Does it make a sense to test an amp at full power at 20kHz? This will never happen in real life.
I don't often see power specified as FTC power, so power specification can be very flexible (often much worse).  I found in the specification of Icepower module continuous power (40W) and FTC rated power for 0-3kHz (150W).
So we have continuous, FTC and momentary powers and anything in-between.   Perhaps for linear power supply amps weight can be a better specification than power? 

As for the listening distance - Benchmark claims that in average room distance doesn't play role.  6dB loss for double distance applies to open space only.  

Rule 13: In a home environment, the SPL at the listening position is about the same as the 1m response of the speaker in an anechoic chamber.

If a speaker has a measured output of 90 dB SPL at 1 meter when fed with one watt, you can expect about 90 dB SPL at your listening position when driving your speaker with one watt. Room reflections supplement the output of the speakers and compensate for the fact that you are more than 1 meter from your speakers. If you are outdoors, this rule does not apply. But, in a typical home listening room, the rule works reasonably well for a quick approximation.

 

hi the amp power no more then 150 watt amp for the b w 805d3 how big is the room what is a good spl level for you  if you like the way the speakers sound take the time to match the amp to the speakers it is the only way so they sound nice to you preamp is more of the sound then the amp the speakers are the sound.50% the room is the sound 50%

@auxinput curious, what amps were those? What are you using now with your 805D3s?

The 250 watt monoblocks were Emotiva XPA-1L.
The 500 watt monoblocks were Emotiva XPA-1

Currently, I’m using Emotiva XPR-1 monoblocks (1000 watt) for my front stage (left/center/right/sub). They have all been completely rebuilt / upgraded. Neotech OCC copper for all internal wiring. 24 x 10,000uf Mundorf caps for main power supply. Nichicon FG/KW for all amp boards. Upgraded WIMA film caps and KEMET film-on-foil caps for all amp boards.   Furutech fuses.

Obviously I’m not anywhere using the full 1000 watts. If I crank it with a heavy bass effects movie, I can get the sub amp to about 70% (which is about 1200 watts into 4 ohm subwoofer load). But the other amps never get above 30% or so with the extreme peaks. The XPR amps have LED lighting on the front that shows how much power it’s generating (like the dials on McIntosh amps).

The more power you have the better your ability to drive worse speakers.  It is better to have always more power and not use it, rather than needing more power and not having it.

If you go with Mac skip the 5300 and go for 7200. It should be more than sufficient for your speakers. Ma7200 is a complete package, an excellent DAC and pre amp all in one unit. You'll also save on cables with an integrated. Don't make your life complicated with separates. 

However, I'd advise you to forget the Mac entirely and go for Luxman L-509X. Much better amp in all respects than Mac.You'll have to add a DAC, or get a nice streamer with a DAC ( aurender or lumin). 

 I say this and I own a two Mac amps, preamp, and av processor. I think your speakers deserve a better amp. I was also initially entranced by the blue meters and mid century modern look and bought all Mac equipment. They're not bad at all, very lush, powerful and warm sounding. But once I heard what other amps could do with my speakers, I could no longer live with Macs. I agree with auxinput, Mac is very laid back and mild.

You know what would sound even better? A tube amp. Once you hear a quality tube amp, you'll never forget that sound. I believe that's where the real audiophilia begins. What type of music do you listen to?