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There's some subtle design tricks being used to emulate how the stages of a tube amp operate and overload when driven hard (part of our patent pending PHAT technology). This is why you need to experiment a little with gain structure to find your own sweetspot for each bass you play.
An amp (kind of like a girlfriend) is a dynamic piece of equipment and has "personality". You need to spend a little time with your amp learning the subtle flavors and dynamics, where the tone and feel is for your playingstyle and personal preferences.

The 9 gets pretty loud.. It is as Red Planet says goooeyyy. I like that.
Your girlfriend has nice knobs.You can have a "tubey" girlfriend. I prefer "gooey".
You can have a "tubey" girlfriend. I prefer "gooey".
Question: Since the manual states that the effects loop is also intended as a "Preamp Out / Poweramp In", will the "receive" input work with an external preamp? If so, does it bypass the internal preamp and work as a poweramp only, or leave the internal preamp active as well?
Is that like " a little meat on the bones"?![]()
From my understanding the effects return is in series and
lets you bypass the internal preamp if you wish. For me, this
is a good thing. For upright bass I can use a a two channel
blender for mic and pickup, blend the signal into a single out
going back into the effects return which gives me only the
master volume of the 9.0.
For me, it just makes the head more usable. The effects return
lets you go directly into the power amp, and use the master
volume on the 9.0.
This is correct.
From my understanding the effects return is in series and
lets you bypass the internal preamp if you wish. For me, this
is a good thing. For upright bass I can use a a two channel
blender for mic and pickup, blend the signal into a single out
going back into the effects return which gives me only the
master volume of the 9.0.
For me, it just makes the head more usable. The effects return
lets you go directly into the power amp, and use the master
volume on the 9.0.
As I had hoped for.More options. Excellent.
Thank you very much.

You are welcome.
The one thing about series effects loops is that they are useable for more applications than parallel loops. Especially for bass players. Comps just don't work in parallel loops.
Effects devices (verb, DDL, chorus) will generally work in series or parallel loops though. In a series loop, the device's onboard (wet/dry) mix control would be used and in aparallel loop, only the wet would be returned and mixed with the parallel loop's return level control.
Hey horse!
Can you please give me some info. Is the master volume pot
on the 9.0 linear or is most of the volume had with the pot
at 12:00 or 1:00? I hope I'm phrasing this correctly.