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Double Bass 2 Input Bass Amp Head

I guess I have to chime in here. I think that the new EA doubler is the most versatile of the two channel amp heads. 550 watts rms. On the second channel xlr input with phantom power. Notch filter. Variable high pass. Phase control from 0 to 180 degrees. And it sounds equally good with electric or upright which I think really puts it ahead of the competition. There--I've said it. Oh, and it weighs 3 lbs.
 
An alternative is a powered mixer.
Some are now available that are fairly light, Cheap, 15-20lbs, with huge amounts of power.
They have some built in feedback control.
They may have more features than most would use, but extra channels are always handy.

The drawback: if you use a "naked" piezo (without preamp), the input impedance usually won't high enough.
 
I guess I have to chime in here. I think that the new EA doubler is the most versatile of the two channel amp heads. 550 watts rms. On the second channel xlr input with phantom power. Notch filter. Variable high pass. Phase control from 0 to 180 degrees. And it sounds equally good with electric or upright which I think really puts it ahead of the competition. There--I've said it. Oh, and it weighs 3 lbs.

That's looking good too. I thought I heard there was no line out, but it looks like there is.

Still, the Markbass has similar features (though no notch filter or variable phase, but MB does have a tube/solid state blend and a more powerful version). I'd want to hear them side by side before making a decision.