Re: surround sound
It depends on how large your theater is. For our venue (about 70' from front to back, probably room for 200 people) we can get away with a RMX850 by QSC. It is 200Wx2 into an 8 ohm load. Most speakers are 8ohms.
The speaker must be able to handle the power the amp can deliver. Don't get a 50W speaker and a 300W amp. If you overdrive a speaker, the speaker can be damaged. It has been said that an underpowered amp that starts clipping can damage speakers rated for more power.
If you can afford it get a larger amp than you think you need. You can always turn down the gain, and if you decide to expand later, you have the capability.
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