I've got a "new to me" 2013 LSV, and started tuning the system this morning... First thing I noticed was with the amp gains set to the absolute minimum, and the HU volume turned to about 4/5 max volume, it's already pretty loud (not great, but loud)....

My understanding was that amp gains at a minimum = no sound. Am I incorrect, or is the sound possibly coming from just the HU, and not the amps?

I haven't done any wiring in this boat, so not familiar with what was done.

For reference, here is my equipment:
Exile xi800.4 - pushing 2 XM9s
Exile xi800.4 - pushing 4 stock Kicker cabins
Exile xi1500.1 - pushing Exile xi12d sub
Exile ZLD