audiocontrol four.1

Hello All, looking for some advice on tuning my inside speakers. im aiming for SQL, as my trunk is purely SPL (lol). my current setup back to front is as follows: 2 12's tantrics in a 2:1 4th order box, on 1 3.5k Twisted sounds amp (currently doing 153.2 out the trunk) Blowthru. 2,4 channel...

For sale is a used Audiocontrol Four.1, Line Driver/EQ. Its in Perfect working condition. Was mounted in dash before so top plate is scratched but definitely does not take away the performance of it by any means. The AC Four.1 has the mounting brackets included so you can mount it under the...