please read what i said earlier and what Nik said.
to be absolutely ****************ing clear, modellers need clean headroom (as in no distortion what-so-ever) and full range faithful reproduction of the input signal.
a legit PA set up will have these:
headroom - like i mentioned, srm450 and eon 15 g2 will have 300 watts going into low frequency driver ALONE. they will have 100 watts going into the freakin' tweeter.
full range - no way in hell you can get full range without a tweeter. atomic doesn't have a tweeter.
excuse my lack of modesty. you can say atomic is very good for modellers. i'll believe you.
don't use the word best. because it's not the best.
while i agree modellers do need clean headroom.... i have tried what you suggest multiple times with my boss gt8. there are thread after thread about this topic at bossgtcentral.com
my experience with doing just wahat you are saying let me in on this..... there is a hiss you cant get rid of when using a PA speaker set up. I then hooked up to a 4x12 stereo cab with my mosvalve 1160 and the hiss was gone. i cant explain it but that is what happened.
so. my set up is now.... digitech 2120 into mosvalve 1160 into 1x12 detuned cab with legend modelling 12's in stereo.... = pure awesome tone.
please note the legend modelling 12's are 150 watt power handling more flat response speaker.