Portable EQ? - Battery Power & SMALL

[midside]

I'm looking for a very small portable EQ that I can use with some small powered monitors. I am running the monitors with (1) lithium battery pack.
The battery is (3) 3.7 volt cells and functions in the range of 9-12.6 volts.
My playback source is a recording device that does not have tone controls
for playback review.
So, I'm basically looking for a really small EQ so I can tweak my playback
mainly to augment low bass.
I plan on powering it with the same battery that is running the speakers
and not looking to bring another battery/charger along.
I have seen a little info on the Behringer FBQ800 & Samson S Equaliser Mini.
Looking for a plug and play option, not looking to build.
Anyone have any input?
Many thanks!

[midside]

Well, looks like both the EQ units above run on an ac power supply and I need
something that will run off a battery without modifications.
Surely someone here must have an idea?!?

[djQUAN]

use EQ's designed for car audio?