Mine is set on high pass, 80Hz, gain at about 5.

Powering 2 - Polk 6x9's, sounds awesome, and LOUD.

With the filter set at 80Hz it still thumps really hard at higher volume,
but doesn't sound like the bass is overpowering like it did when set to
all pass.

 

Did you stuff with the sheet or the loose stuff?

 

I have a Reckless fairing on my Road King, and used 3/8 thick high density foam from a door mat to line my outer fairing.

Using this foam from a door mat was recommended by a high end stereo installer I know that builds some awesome systems. He says the foam right behind the speaker absorbs the pressure wave coming off the back of the speaker.

I can honestly say it works. I used the system a couple weeks before I lined it with the foam. After lining the fairing the system sounds much cleaner, especially at higher levels.

A very cheap mod that actually works.

 

Was a roll, pulled it apart....kinda looked like insulation without the backing

 

I too have the pbr300x2, stock HU and have run both polk mm651's and the kappas. Currently have kapps in there and was wondering where your bass and trble settings are? I think my treb is set to 3/4's and bass is like around 1/4.