[Arny Krueger]

wrote in message ...

Actually, that 90wpc is at 1khz, not full bandwidth, and that's also at
0.9% THD.

Knock off 10% to get a 20-20 KHz number.

Basically, its more like 50wpc RMS @20-20khz.

IME very pessimistic. A modern amp gets as high as 0.8% by clipping. Keep it
out of clipping, and THD will immediately slip below 0.05%. Similarly, its
20 Hz thats the sticking point. Above 50 Hz, it will be clean.

One can only speculate why a vendor will jack up the power to make a good
65-70 wpc amp into a questionable 90 wpc amp.

Also, the numbers given are for 5 channels, not 2. Driving just 2 channels
takes a lot of load off the power supply which is probably the determining
factor.

The OP is not clear whether he's going to buy 2 CM1 or 5 CM1. I'm thinking
that at $1k per pair list price, he's not getting 5. ;-)

The CDM-1 is about 88db sensitivity,

84 per the B&W web site. 88 dB would be very exceptional for a speaker this
size and low end extension.

B&W recommends 30 to 100 watts, and with just 2 channels driven the Yammy is
probably near the upper end of that.

Still, the Yamaha will sound just fine unless you push it too hard.

Agreed.

And, IMO, buying the best speaker you can, even with mediocre electronics,
will get you *much* better sound than cheaper speakers and high end
electronics, so it's hard to go wrong putting your $$$ into the speakers
first.

Unless space is very tight and more bass is forbidden, the CM1s seem to be a
bit questionable all by themselves.