What no one has really set me at easy on is that in stereo I would like to turn these babies up loud enough to hear outside on my deck with no problems. Or bringing the entire sytstem outside to blast in an open range setting.
I have the same issue in our place. I do not have (and really we do not want) outdoor speakers on our patio, but i can open up two windows and turn up the volume on our main floor system to attain the adequate volume outside so we can enjoy music while out back.
To do this, a normal receiver was inadequate, but the Anthem MCA30 amp (about 200w / ch) has been sufficient.
Indoors at 10' distance i've measured the SPL around 108-110dB (using Tannoy Definition D700 speakers) while the SPL drops out on the deck to about 80dB.
Don't let anyone tell you that this isn't enjoying music!