What amp is a good one to add with my 4180. Current setup:
2014 FLHXS
BT pro 7.1 paralleled with Hertz HCX 690 lids
&
Hertz HCX 165 (lower fairing) on sep channel

I've been in debate of switching my pros to hertz spl plus st35 horns.
Upon further consideration I've been looking to just add an amp and probably run straight to the pros and allow them to shine. With that said I want to keep both amps in the fairing.

I've considered the nvx along with a cerwin vega b54, however I don't know how much room I'm going to have.

 

Got your note man. You can't run your fairing speakers in parallel with your lids and they either is going to "shine". Do you have the J&M Mount? You'll need it to maximize your space.

 

I don't have one! Guess that's the first step

 

did you go with a second amp or change the parallel to the lowers and lids?

 

I ended up running the fronts and lids in parallel. Lowers on a separate ch due to the other two being closer together.
I've since switched to a road glide so I'm doing it all over again. I may be putting 8s in the bags and then either 8s and horns in the lids or 6x9 in the lids.
May be selling my bt4180 too.

 

Cool. Good luck and take some install pics!