99' Vette Coupe; No Bass
 

Hey all, I recently replaced the door and rear speakers with 2 way aftermarket 6.5" speakers. I had replaced the Bose head unit a few months prior before the Bose speakers blew. When I replaced the head unit, I installed the Bose amp adapter, PAC OEM VET1. Now with all the Bose speakers gone, my aftermarket speakers barely have any bass. Treble and mids sound great, just no bass.

My only theory is the PAC adapter is preventing the headunit from pushing any bass. Any thoughts? Do I need to remove the adapter from the harness?