Have you run both signals through a spectrum analysis?
Forget the IR what do the two graphs look like?
Also remember - Every tube amp made is different. For example I had two Jubilee heads late 80s. One was the best amp I’ve ever owned. One just wasn’t, felt like less gain and definitely less mids and ‘poke’.
Both left the factory within a few days of each other.
Component variances add up. Just because the fractal model has more or less anything that your particular amp doesn’t make it wrong it just makes it different to your amp.
I do think the FM3 is slightly more ‘present’ than the III. Maybe converters? Who knows I like both
Forget the IR what do the two graphs look like?
Also remember - Every tube amp made is different. For example I had two Jubilee heads late 80s. One was the best amp I’ve ever owned. One just wasn’t, felt like less gain and definitely less mids and ‘poke’.
Both left the factory within a few days of each other.
Component variances add up. Just because the fractal model has more or less anything that your particular amp doesn’t make it wrong it just makes it different to your amp.
I do think the FM3 is slightly more ‘present’ than the III. Maybe converters? Who knows I like both