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Thanks RAG! Brian already emailed about swapping out my unit. It would be cool if the new rev could include access to the handle screw heads too. I really want to remove mine so I can use a right angle cable on the input jack. But that's minor, and I feel silly mentioning it really.
This has been my first GK product and I've been playing bass for 15 years. Worth the wait!
Pure class, Bob. See you at NAMM!
When designing this amplifier it did not occur to us that any one would want to rack mount it.
23 Pounds for a wireless, flashy tuner, AND bonafide 500 watt GK amp - all rolled up into the protection of a rack case! 
Had I thought for a second, I wouldn't have posted. Knowing a fair share of engineers of various persuasion...it shouldn't have caught me off guard...it just sorta slapped me in the head like a cold mullet...I don't think he meant to be rude. I manage a group of engineers, and this is just the way they normally talk to people. That's why it's usually best not to let them talk directly to the customers. They don't sugar coat anything... they simply speak very directly. I read his comment and thought nothing of it.![]()

I'm betting series, since that's most typical.Can someone tell me if the fx loop on these is wired in series or parallel?
It's not an additional change; there was a change made to the pre-amp and I/O board grounding. Both changes fell under the same ECO (Engineering Change Order). The person who makes the labels assumed a Revision up-rev. without actually looking at the ECO; but now it's corrected.
Can someone tell me if the fx loop on these is wired in series or parallel?
99% sure it's series. I have never seen a GK amp with a parallel effects loop.
There might be an older GK amp with a series loop that exists, but all of their current heads have series loops. I doubt the MB^2 is an exception.
Bummer. I was hoping I'd be able to use the return fx jack as an aux input for a drum machine when practicing . If it's in series, that won't be possible :-(
I'll be running it into a Schro 15+L and 12L stack-looking fwd to hearing it and comparing it to my Shuttle 3.0.
Just got home and got mine out of the box......damn, an A00
That said....this little thing is -loud- and sounds much better than I had anticipated. Stupid light....I just bought a nice backback to put this, and my cables/strings/tuner in. Will be a nice one trip load in/load out using this with my 1210l