Speakers that work with Atma-sphere M60 amps.

Add Lowthers to the list. Members of the Chicago Horn Club heard a pair of Lowther PM2As driven by a pair of Atma-Sphere MA-1s a few weeks ago to great effect, perhaps overkill since M-60s and probably an S-30 would have been adequate. Jon Ver Halen of Lowther America was there as well. It can't speak for him but one could ask his opinion.

The ZERO autoformers enable other speakers to be used successfully with the amps.

Brian

As a corollary to Gregadd's post, I found that my Raven R3.1 ribbon drivers truly revealed their dynamics and speed with M60s. Their 3ohm nominal impedance doesn't labor the the M60s given their 99 dB efficiency. I have the luxury of actively biamping, keeping the M60s from having to drive paired 12 inch midbasses at 4 ohms. Matched to the right loudspeakers, otls are quite remarkable.

Brian, interesting you bring up the Lowthers.

A friend and I got together this weekend for some fun. I brought two pairs of Lowthers (PM6C and PM6A), and he brought the cabinets (Lowther design big ports). With an 18 wpc, 300B amp, we discovered some of the MOST involving sound either of us has come across. We didn't even get to try the PM6As, but he wrote to me that he's spent the past two days listening exceptionally late into the night in absolute joy. Even his wife couldn't get over how terrific they sound.

In the end, we'll each have a pair of ported Lowther speakers, and I intend to see if my heavily modded M60 MKIIIs make a nice marriage with them.

Jb0194 -- what are you partnering the 3.1s with? You mentioned a 12" midbass... could you give more info? Cheers