Summary: I just installed these as my front speakers in a 5.1 surround setup and could not be happier! The level of my satisfaction was greatly enhanced by the fact that, when I turned the system on for the first time, my sub wasn't working (not properly connected). However, while I could tell I wasn't getting the powerful bass you expect from a subwoofer, these guys were driving some pretty impressive bass on their own.
Summary: Right off the bat, I knew I needed discreet but quality sound since most wives don't approve of displaying tower speakers in a main living area. With this in mind, I needed to eliminate the separate subwoofer option, figuring the 8 inch woofers in the MC80 would be able to produce the deep sounds I desired.
Pros: super clean sound and rich bass that you wouldnt anticipate at this price point
Summary: My system is used for music only. I listen to mostly jazz, classical and sometimes progressive rock (Renaissance, Yes). The core of my system is the Onkyo A-9050 amplifier, which feeds a pair of Klipsch RF600 speakers in the study and a pair of Polk MC80 ceiling speakers in the adjacent workshop. At present my sources are a Grundig Satellite AM/FM/air/shortwave receiver, a Sony CD player and an MP3 player and all of my cables are Audioquest.
Pros: Sound just as good as the $500.00 Klipsch Reference floor speakers in the next room.
Summary: Excellent for the price. You can spend a lot more, but unless you have incredible senses these speakers will more than fill the bill. Also -- you can spend less -- and if you do -- you will know it. These are the right speakers for in-ceiling systems at the right price. I replaced our six on the main floor (what I'd call builder grade) with these. A great improvement.
Pros: Price and Sound Quality
Cons: Takes a while to "ratchet" them in. Also, they are just a tad smaller than the speakers I replaced -- so if measuring for standard replacement the flange that fits to the ceiling is about an 1/8 of an inch shy.
Summary: If you can use a tape measure, Sheetrock saw, and can read instructions the installation is easy peasy. The most difficult part was convincing the wife that I wasn't going to permanently scar the ceiling and satisfying her incredibly accurate ability to center things. The speakers sound great in a medium size kitchen and the treble & bass are evenly balanced as well as clear. Wife available for centering speakers within any space.
Pros: Easy install, looks great on ceiling, no need to paint trim or grill. Sound great.