enough watts to drive these speakers? Help?

Your calculations are a little optimistic based on my experience and will vary according to speaker design. Having said that, i don't see a problem with 8 - 10 watts of power feeding "normal" impedance speakers in this size room. That is, so long as one doesn't expect "thunder" and / or the amp uses tubes in the output stage. Tubes overload much more gracefully ( as a general rule ) than SS designs, producing more listenable results even when the amp is temporarily over-driven. Something along the lines of a 300B ( or something similar in output ) should work pretty well. Just be careful as some small amps are WAY over-rated AND don't like low impedances at all. Sean
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Bombay pointed out an important factor i.e. seated listening distance vs apparent spl. Having said that, one can't calculate the reduction in spl based on distance without knowing what type radiation pattern the speaker makes use of. Some speakers "project" sound into the distance in a more linear manner than others.

As a side note, the first receiver that i ever had was rated at 12 wpc driving speakers that were around 88 dB's or so. While it wasn't the cleanest ( not by a LONG shot ), this little "beast" could play pretty loud. This was with highly compressed hard rock i.e. "demanding" music that put a steady strain on the amp / power supply. Given that tubes tend to clip in a much more "usable" manner ( SS sounds like HELL ), and the dynamic nature of most classical and jazz music, even with "conventional" front firing boxes, i think that he'll be okay. That is, so long as "moderate" is all that is required. One would also have to assume that this is a secondary system since it is going in the bedroom. Sean
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Good points Marco. My comments referencing the 300B pertained to some "manufacturers" claiming that their single 2A3 per channel ( or similar tube ) will do 8 - 10 wpc. Since you're amp is not a SET and each tube is only doing half the work, it is possible for two 2A3's to make that kind of power.

The reason that i mention this is that i remember a speaker manufacturer measuing a certain SET amp that was advertised at 8 wpc. The person that had bought their speakers was using this amp and complained that the speakers weren't as sensitive as the manufacturer stated. That is, 8 watts should have driven the speakers, but it wasn't. The speaker manufacturer wanted to see what the deal was, so they checked the amp. When it came down to it, the amp was having a hard time doing 3-4 wpc, which just wasn't enough. As such, one should look at the tube compliment of the output stage along with the rated power output. If you've got one tiny tube per channel, don't count on ore than a very few watts at most. Bigger tubes typically have bigger plates and can pass more power, offering higher output levels. One can also achieve this by paralleling multiple tubes or running multiple tubes in push-pull fashion ( like Marco's amps ). Buyer beware... Sean
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