Pass First Watt J2 vs F3

I have not heard the F3, but the J2 has the finest rendering of inner detail, micro dynamic finesse of any amplifier I've ever heard.

The Atma-sphere S-30 has a smoother top end and is faster. They're comparable quality amplifiers and neither will be absolutely better than the other.

J2 I haven't heard but I have heard most of the other FirstWatt models (and the S-30 which I also really love). Of the FirstWatts my faves were the F2J and F3. I'd recommend getting on the phone with a FirstWatt dealer. Both Mark at Reno HiFi and Jon Ver Halen at Lowther USA in Chicago are great to talk to and can give a lot of guidance. Reno HiFi has an excellent return policy as well.

Whether the extra watts alone will be an improvement will depend on your speaker. How sensitive are they? What kind of volume do you listen at? In what size room?

Unfortunately i've only heard the F3 in the First Watt lineup. Great amp imo.
I am running Audio Note E spkrs which are about 96db sens.
--- in a 14x15x10h room and i do like to crank em loud occasionally.
What i'd like to have is a F3 that puts out about 50 watts ..... :>) .... that would give more spkr choices -- can't have it all i guess.

i heard both in my system and they are both excellent. i choose the J2 for two reasons:

1. More dynamic range in my system, the extra power.
2. The F3 has very low imput impedence and was a poor match with my Hovland pre.

awesome amps