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FWIW ..... Randall and the good folks at Mesa Boogie are coming out with a series of pedals soon (if they have not actually hit the market already). I believe they are all guitar oriented distortion/overdrive type pedals, but hey, you never know, if they are in a pedal making mood, and Mesa hears that there is interest in the bass community about this idea (i.e. a WA preamp type pedal), maybe we would see one out in the wild sometime in our lifetimes.
just sayin'

FWIW ..... Randall and the good folks at Mesa Boogie are coming out with a series of pedals soon (if they have not actually hit the market already). I believe they are all guitar oriented distortion/overdrive type pedals, but hey, you never know, if they are in a pedal making mood, and Mesa hears that there is interest in the bass community about this idea (i.e. a WA preamp type pedal), maybe we would see one out in the wild sometime in our lifetimes.
just sayin'
Walkabout9?
Sign me up yesterday.
Mesa should still have my credit card info on file.


And why doesn't every bass amp come with this EQ section?
"Is there any noticeable difference in volume/power when running it at 2ohms versus 2.67ohms (using 2x12s)?"
Not really, IMO.
I'm starting to think I should get an 8 ohm extension 12 for my 4 ohm WA, get over the fear of running it at 2.67.
I did some power output tests on the WA:
http://www.talkbass.com/forum/f15/mesa-walkabout-power-output-tests-765716/
Even at 2 ohms 2% distortion and 1 Khz input wave it only got to 484W RMS.
2.6 figures were really good at 442W RMS.
The problem with running 1 - 4 ohm cab with a 8 ohm underneath it is the 4 ohm cab will end up taking 2/3's the power and only 1/3 will get to the extension cab.
In practical use this means your volume will be limited by the combo's 4 ohm driver and the extension would have more potential but not be used. It's just a little less efficient however, it may not matter to you because you will indeed notice a volume increase adding that 8 ohm extra driver.