I just took all of my stuff out of my 2006 Malibu and put it in my 2007 Lacrosse. Here's everything I put in: Sony XNV-770BT navigation head unit Hifonics Brutus BRZ1200.1D Two 12" Alpine Type-Rs (4ohm) running at 1ohm I used a different wiring harness in my install, I used the Axxess GMOS-04 Class II OnStar® Interface for Amplified Systems. Here's the problem, I'll use the volume level 20 (on my head unit) for reference, at 20 in the Malibu everything was perfect, it was loud and the subs really showed their power over the rest of the speakers. I only had the amp turned up about half way. Now, in the Lacrosse the volume is super loud at about volume level 12, and I know the subs will get just as loud but the problem is that the other speakers are just louder so I can't feel the subs as much. If I turned it up to 20 like before the subs would need to be louder. I turned up my amp all the way but the speakers are just too loud. Before I had the speakers and subs at about the perfect level but I just can't reach the level anymore. I would assume the problem is in the factory amp of the car, it has the "premium sound system" and the Monsoon amp must be making the speakers too loud, I know it sounds weird but I'd like to turn them down. There's almost no quiet anymore, 5 is loud and I think it goes up to 64. Is there any way I can turn down the rest of my speakers since I can't turn the amp up anymore?