Audio Configuration Help

[downtownva]

Ok fellow X5 owners, I have a burning question to ask. I am not that happy with the bass in my X5. I want to add a larger sub. The guys at the car audio shop tell me to add a sub I must upgrade my doors because they are pretty weak also. I would love opinions on upgrading the door speakers as well or just adding the sub. Below is what I have going in.

MB Quart RAA2400 Amplifier
MB Quart PWE304 Sub 12”
Ipod
IceLink


Proposed Door Speakers

MB Quart RCE 216
MB 4CH Amp


PS. Any suggestions on the door speakers would be appreciated. Also, I have the DSP system.

Thanks