I think I can provide some useful information on the ML2. I'm sorry to be so late to this conversation. I have been out of the audiofile world for decades, and I've decided I want to do some serious listening through a good system again. I'm thinking you folks can help me catch up with new developments and products.
Mark Levinson hired me to be chief engineer for his company in December, 1974. I was the ninth employee and first engineer at the company, and I participated in the development and production of the ML2 amplifier. I relate that info simply as background.
The ML2 is capable of 100 watts into 8 ohms in a bridged configuration. That requires two ML2s per channel, one driven normally and the other driven in inverse polarity. Both connections are on the back panel. Although they were uncommmon, triamped HQD systems with an ML2 on each tweeter and bridged ML2s on the mids sounded amazing, and amazingly loud. I don't recall the various large amps used to drive the Hartley woofers, which ranged up to 24 inches.
I'll be happy to provide additional information on request. It's been over 40 years, but I still remember my MLAS experience pretty well.
George Mayhew
