Originally Posted by powerdubs
“Most room environments” is the furthest from what I am in.
My ceiling peak is 22 foot, open to a loft up stairs, and open floor plan below. Huge space.
For an idea- I just hooked up two new S3600 Ipal, and when running audyssey it kept saying level too low until I put the gains at max!!
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The only thing that matters for speakers is how far you are from them. Indoors, you will lose about 3-4 dB for every doubling of distance from 1m....so the 210's require 1 watt to produce 98 dB at 1m or about 3ft.
If you sit about 12 feet from the speakers, you have doubled distance twice: 1m to 2, 2m to 4m. So SPL will drop about 8 dB or so. So the 210's which make 98 dB at 1m with 1 watt will make about 90 dB at 12 ft or about 4m.
If you want reference level output of 105 dB peaks(probably louder than most listen in houses), we have to double power for every 3 dB of SPL, so:
1 watt = 90 dB
2 watts for 93 dB
4 watts for 96
8 watts for 99
16 watts for 102
32 watts for 105 dB if you are 12 feet away. This *does not* account for eq which, even if you are limiting eq to below 300 Hz as you should be doing for well designed speakers, Audysey will most certainly be boosting dips in the response below 300Hz by up to 6 dB. This doubles power requirement two more times, so:
64 watts for 3 dB of eq.
128 watts for 6 dB of eq.
This means that most decent AVR's should be able to drive PSA 210 speakers to reference level at 12' even with room correction eq applied...but as you can see.....it will be at the limit of what most AVR's can supply.
This clearly shows why most(all?) low sensitivity speakers will not be able to produce anywhere remotely close to clean reference level output, since they require ten times as much power(1280 watts) to drive as PSA MTM210(assuming 88 dB rating and 8 ohms) to reference level with eq applied.