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D.I's?

A D.I., or Direct Injection unit, changes your bass signal from high impedance to low impedance. This allows you to run the bass signal through the PA mixer or into a recording console. The regular signal from a bass can't be plugged into a mixer, it has to be transformed into a microphone-level signal.
 
Most of the engineers I've dealt with dislike being sent a post EQ line, so in this situation you need a head with a pre/post switch or a DI box.

Or you could send them a pre EQ line from the DI, a line from a BDDI or similar,a post EQ from the head, and as many mics as you can fit on your cabs, and let Mr Front-of House deal with the phasing:)
 
It also depends ALOT on the quality of your balanced out. Not all balanced outs are created equal, although most built in units are getting better. Most touring pros use separate DI's and don't rely on the built in amp models. Of course they're playing bigger rooms and relying a lot more on PA support.