A possible problem with 5/7 channel AV receivers (even quite expensive
ones) is that they can be bit weedy driving current-hungry full range
speakers. Don't necessarily believe the power output specs! Things seem
to have got worse over the past few years as manufacturers have diverted
the budget into DSP and video processing, etc. I had a pre-HDMI Pioneer
receiver which seemed to provide enough power to light a small village,
but these things are now the exception rather than the rule. 

One way around this is to make sure the receiver has pre-amp outputs,
and link it to a 2 channel power amp or an integrated amp which has an
"A/V" mode, effectively turning it into a power amp. The A/V receiver
would then be left driving the centre and rear speakers, which should
be fine, especially if those speakers were small ones, aided by a
powered subwoofer.

That said, Harman-Kardon receivers, for example, have a good reputation
for providing plenty of power - unlike some, their specifications seem
to be conservative. 

Exactly how much you spend on amplification will depend on the size of
your room and the efficiency and impedance of your speakers.


-- 
darrell
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