Speakers for my Yamaha Amplifier...?

Don't waste your money on Bose. People who like Bose either are deluded by the mindset that more expensive is better, or they simply haven't listened to other products on the market for significantly less money. Bose spends a lot of money on marketing and advertising, which is why its so expensive. But, that doesn't translate into a superior product.

I would recommend a Klipsch system. You can pick up a set of Klipsch Quintet surround speakers (left and right front and back, and center channel) plus a KSW-12 12-inch powered subwoofer for about 1/3 the price of the Bose Acoustimass 15 that will blow it out of the water.

I also wouldn't waste my money on a 7.1 surround receiver. That just puts an additional set of surrounds on the sides (for 7 total speakers plus a subwoofer instead of 5). And, the .2 part of the 7.2 means an additional subwoofer channel, which is serious overkill unless you have a dedicated home theater room in your house (and a huge one, at that).

Besides, there is very little programming out there (maybe some of the newer Blu Ray discs) that were even recorded in 7.1 or 7.2. So, the receiver just takes a monophonic component of the back 5.1 surround channels, runs those rear surround channels into the additional side surrounds, and runs the monophonic channels to the rear 7.1 surrounds. All for the privilege of paying more than twice what you would pay for a similar 5.1 receiver, and for the additional cost of the extra surround speakers and subwoofer.

No. If you have the owner's manual on hand, I suggest that you read it and fully understand all of the features as well as speaker connections should be treated. First off, there are two speaker systems: A & B. Each system has a Left and a Right. Each left and right must be properly connected to a speaker with an 8 Ohm impedance and no less a rating of 100 watts each. I say this because of the fact that your amplifier has the capability to deliver more than 85 watts per channel peak power, depending on the program. Also, observe polarity of your speakers. You want all of your speakers pushing at the same time, otherwise, you will not hear exactly what the artists, producers, engineers and the record company executives want you to hear. In other words, make sure that all of your speakers are in phase. The wire that you use to connect your speakers is very important, as a thin wire can have a signal loss that will actually wind up having your amplifier see a load per channel of about 10 to 12 Ohms! I highly recommend that you use at least a wire of 14 gauge. This is wire commonly used for extension cords. Using 12 or 10 gauge is OK, but can be very expensive, unless you want to run your speakers a pretty good distance from the amplifier. The longer the run for each speaker, the more of a signal drop/loss in the speaker wire. Heavy gauge wire is recommended for this application, such as an out door party, for example. I hope this will help. Rock on, brother!!

I'll echo what Paul in SD said. I was appalled the first time I opened up a Bose speaker and saw the junky components they used. I build (or rebuild existing) all my own speakers so I don't keep close tabs on what is commercially available. HK and JBL are now pretty much cheaply made consumer level speakers from what I have seen. Polk and Klipsch seem to have maintained their build quality over the years. If you want good speakers go to a shop that specializes in what we used to call Hi-Fi and is now known as Home Theater. Make sure they aren't a Bose dealer as that company forces dealers to push it's products. I should qualify my statement that don't keep close tabs on what is commercially available with the statement that I have done considerable research on Bose speakers and they are indeed truly appalling from a standpoint of accurate sound reproduction and value. This is particularly true of their "Acoustimass" line.

http://www.crutchfield.com/p_732RCMIC/Energy-RC-Mi...

great receiver, would also check out Energy speakers.