Why not use a PC style UPS?

They generate large amounts of electric noise. They are typically designed as surge protections and UPS, not power conditioners.

been there & done that,onhwy61 is right about the noise level,you would not be happy with the results,i wasnt.

What Onhwy61 said

You could ruin your gear. Some UPS only produce a "Square wave" electrical signal. Cheaper to make. Computers don't care. You need a good sine wave otherwise your gear may suffer damage.

APC (American Power Conversion) who is one of the largest makers of computer UPS devices is coming out with a Home Theater and Audio line of UPS gear. They had them at CES. They should be available in the spring.. See the link below..

[url]http://www.apc.com/products/apcav/[/url]
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Computer UPS's aren't designed for high current transients (such as you would get from an amplifier). That's why you don't connect laser printers to a UPS. It might actually damage the UPS.

Michael