Yamaha M & MX Amps

The MX 1000U (U = United States) is the only one on your list I have info on. The MX-1000 is very similiar, but had the ability to be switched for differing operating voltages.

Minimum RMS Output Power per Channel:
8 ohms 260 watts
6 ohms 295 watts
4 ohms 330 watts

Supposedly stable into 1 ohm loads as well, but have no specs.

I have the original sales brochure for the MX 1000U, MX-830, & Mx-630 as well as the operating manual for the MX-1000U if you are interested in specifics. Just email me.

I follow auctions (usually on Ebay) for the MX-1000 & MX-1000U and even after 12 years the MX-1000's usually sell for over 50% of their new price, so there is still plenty of demand for them.

The M80 is either 240wpc or 260wpc I have the amp at home and could check for you.Class A to 30wpc. The M80, M65, M60 series are the older models and they have left and right gain controls and A,B and C speaker configurtions.

Try this little known Yamaha Japan website where you can download pretty much any manual they've written.

http://www2.yamaha.co.jp/manual/english/index.html

http://www2.yamaha.co.jp/manual/english/download.php?div=av&lang=english