Something that might help you understand is looking at the "SPL In Room 1watt/1meter" spec for each speaker. This will tell you basically how "loud" in dB's that speaker will play from 1 meter distance when driven by 1 (one) watt. The subs have their own amplifier so they don't matter in your decision.
IWOW M22 92dB's
IWOW VP150 95dB's
Qs8's 95dB's
No, you don't sit 1 meter away from your speakers, but this gives you an idea that your speakers will play very loud, when only driven by 1 watt. As you double your power, you gain 3dB's in loudness. Also I believe for every 6ft away from a speaker you lose 3dB, or something like that...
1 watt 95dB
3 watts 98dB
6 watts 101dB
12 watts 104dB
24 watts 107dB
48 watts 110dB
96 watts 113dB (and I am only figuring one speaker)
If you consider how loud most people listen to music on average, a 100-130 watt receiver is more than capable. I most situations your only going to be using 1-3 watts, with maybe some brief jumps upto maybe 100 watts needed. All well within most receivers capabilities.
