People will tell you there are several that can be easily heard in an acoustic setting, but unless you're sitting right in front of the crowd, and your bass has those horrible bronze-wounds and your ripping the hell out of them with a stone pick and whoever's playing the acoustic guitar is sitting twenty feet behind you, it's an uphill battle.
We're bassists, it's all about tone and there's only so much tonal variety you can get out of an unplugged acoustic bass.
Now, using a battery-powered amp, is an entirely different thing. The Roland Micro Cube will really get the job done...it's a good little practice amp, too, and the Joyo is small enough to wear strapped to your back. Then, you'll be able to put a nice set of D'Addario black tapewounds on your bass.
And you know what?
They both have volume knobs!
Camping out, bonfire on the beach, street-corner jam, whatever...just buy one of these.
I did and I'm more than pleased.
$59...you can't go wrong.
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As for the "If you have to plug in, why not just use a P bass?" arguement...
Seriously?
Again, we're bassists. It's all about tone.
Hell, I have a G&L L2000 but it can quite replicate the tone my Dean Exotica can produce.