First Watt M2 versus F3

I have used both amps with Silverline SR-17.5 speakers, which are above average in efficiency. My listening room was small, so I don't think the power difference was very important.

Basically, the M2 was rounder and a little fuller. To be honest, however, the F3 was a clear winner for me. It had amazing clarity within a generally warm sound. I had previously tried an F5 with poor results--fragile to the point of being brittle.

If they ever create a more powerful version of the F3, well, that would be amazing. I hope this helps.

Yes it does, thanks!

I'm a few years late to the party, but as I currently own both the M2 and F3 I wanted to record my thoughts for posterity.  Hooked up to Zu Defhead speakers with a Manley Shrimp preamp, I favored the M2.  The difference between the two amps was not huge to my ears, but I thought the M2 was a little more lit up in the upper range, like a good tube amp (which I also compared with).  The F3 sounded slightly darker, more veiled.  M2 had a little more pinpoint imaging.