Decided to do a retro install in the basement. I'm putting a Marantz 150 tuner, a 3650 Preamp and thought I had purchased the "matching" blue meter amps, three 140s. Unfortunately the info given to Me was incorrect. The 140s are not the correct size. It turns out it is the 250 series I need. Not 250Ms but 250s. So if anyone needs 3 Two Chanenel 70 watt 140s let Me know. They would be great for a Home theater setup! The reason the amps must match to the 3600 and the 150 is because I am installing them countersinked into the wall. Thanks!