Custom MXPX basses!

[TSanders]

So, if they are passive, what are those control knobs for?

They are just there so they can use a standard 2 band eq control plate.

 

[RocketRalf]

They could be passive cut knobs, no boost, right?

 

[Joey SQUID]

I believe they are just there for looks no function

 

[TSanders]

Correct, mikes pickups are wired straight to the jack.