I see folks compare some of these amps and I see where mistakes are made judging them.
Do not judge one amp by how you operate the other. Use your ears and your brain. Do not use the "my other amp adjusts like this" brain.
This really really became apparent to me while comparing the MarkBass LMIII and MarkBass TA-501. Off the cuff one would say the LMIII is louder and has more power. Funny thing is they share the same Poweramp. The TA-501's input sensitivity is waaaayyyyy different than the LMIII and the EQ points are waaaaaaayyyy different as well.
I just got my 9.0 and have only played it a few minutes. Right off the bat I noticed the Input is less hot than my LMIII (it takes a higher setting to achieve the same db).
Also I noticed with the 9.0 one can light up the input clip light without any noticeable hard square pop like the LMIII gets when it clips. As a side note because of the complex nature of the input of the 9.0 one can achieve a warm smooth overdrive without ever lighting up the input clip light.
Without getting any test equipment out I can tell the gain is different at the Master volume between the two Amps. If you like your LMIII's master half way up then set the master on the Shuttle 9.0 all the way up (now this does not make the volumes/loudness equal). At these setting the 9.0 is way louder than the LMIII and I mean way louder.
The best way to describe this is it's like the LMIII is wide open at half way on the master, yeah there is more knob left but when you turn it up it does not get any louder and the limiter starts kicking in really quickly.
I played the 9.0 into my 2x10 SWR Golight and cranked it. Wow, careful, I thought I was going to overexcurse. The 2x10 can not take it. The same 2x10 I can dime the LMIII into and it just squashes.
Interesting the 9.0 is not going to be making it a mystical magical wonderful experience with my 2x10 because I can see I'll end up blowing the 2x10.
Real quick, on to the tonal thing. I noticed right off the bat how different the 9.0 sounds even compared to my 12.0. For what ever reason known to Hasbeen and Aged Horse this thing is voiced really different. I can hear that clarity of the Shuttle Max 12.0 coming through but for some reason this amp is gooey and folks I mean gooooooooeeeyyyyy. It is almost not possible for me to describe how this amp sounds. Rock solid, clarity, warm, mega bottom, and gooey. The whole gooey thing strikes me as almost unbelievable. The 12.0 has the 3D clarity to it but the 9.0 is just plain ol gooey.
Anyway my Grandson just woke up from his nap so off to go play some more.