I wonder if I have the same problem. I have the bass cranked to nearly max just to get some low frequency fill. Definitely not what I expect from an enhanced audio system.
My 99 M3's HK setup absolutely blew this system away. Kind of pathetic.
08 E90 M3 Interlagos Blue
99 E36 M3 Cosmos, #2--Sold
99 E36 M3 Cosmos, #1--Sold