The amp is working as expected nice power and it offers the ability to adjust gain and cut off which is helpful when trying to tune the system.
Build quality is poor this due to my amp arriving with both adjustment knobs pushed in a bent.
This did not happen in shipping (as the amp was well packed) so it was in the build and as such this should not have passed QC at the factory.
Sonic requested photos which I sent but did not peruse the issue as the damage did not affect the amps performance and circumstances (I was out of the country and the car was at the installers) prevented me from returning the amp for a replacement.
It was not Sonics fault as the amp was sealed but they are the seller so the responsibility lays with them.