Vocopro FA500 - Member those?

Hi there, hope all is well in audioland...

Have a pair of the Vocopro FA500 with the IcePower modules inside and am currently using them to power some 4ohm bass shakers.

As the manual states, the 1/8 input has a preamp and will get me a higher level, but I've always used to RCA adapters into the back inputs. The preamp was always the weak point in these and know most bypassed it with a Ghent Module I believe.

Assuming I want to run this unbalanced, I have a few questions:

- Does running with the RCA adapters into the 1/4 ins actually bypass the preamp?

- Will the Ghent Audio modules get me maximum output, bypassing the preamp and getting max gain possible, and louder than the 1/4 adapters I'm using now?

Clearly audio quality isn't priority in the bass shaker world, but would like to keep these amps useful as hifi amps too and wasn't sure what I should be modding to get what I want. Thanks