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.
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.