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Very common problem with today's receivers. Receivers made today don't have a true preamp section in the amplifier and do not amplify the sound to the extent of an older receiver. I have large 15" front speakers on my system, and have stuck with my 15 year old receiver just because I know that a new receiver will not have the power to drive them well. Many of the newer receivers need to be turned up to 50-60% before you can even hear anything from the speakers.
Hi. You can always use a Receiver with an output impedance that is lower than the speakers input impedance.Problems arise when you try to use a Receiver with a higher output impedance than the Speakers input impedance.
Why does impedance concern you? This receiver can be configured for loads as low as 6 ohms. The front speakers can be 4 ohms if you use a single pair.
It's all explained on page 106.
This receiver should be able to drive most quality speaker systems. Anything from ub/satellite sets to 6-matched speakers plus a sub will work. It seems you have a choice already made for surrounds. Whatever yoy choose, you have to balance performance, aesthetics and price. The Yamaha is probably not a limitation. Get what you can afford and place to your satisfaction.
Officially this receiver supports only 6 and 8 ohm speakers. But for surround speakers it should not do any harm, because they are not played at full volume. But be sure to set yamaha for 6 ohm speakers. Using only 4 ohm speakers makes the amplifier work more hard and produce more heat, that's why you can't use it at high volume.
Home Receiver - Dolby Pro Logic - 1995 Related Models
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Here's the specs, see below but looks like 100Wx2 speakers at 8ohms.
Features: A/V remote; Digital Signal Processing w/ 6 soundfields (Dolby Surround, Hall, Theater, Stadium, Game, Acoustic), Soundfield link; 30 presets; 4 audio/ 4 video inputs (1 tape monitor); sleep timer
Specs: Stereo: 100w x2 into 8 ohms (20-20k Hz) at 0.3% THD; Pro Logic: 100w x3; Surround: 25w x2; subwoofer preout; FM sens. 11.2 dBf; 17" W x 5 3/4" H x 14 1/2" D
Hope this helps!