The OP never received an answer, nor I to this issue, so I thought I would bring it back up. Can the volume on base audio system be increase by some setting adjustment via computer? Cranking the volume to max not even loud enough compared to our 2009.

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Arrived - '11 35d Alpine White/Black, Sport w/Adaptive Drive, 214's, Tech, Prem, Ipod/Sirius, R Climate, Probably no First Aid Kit
'01 Suburban "Shrek" 130K miles and still strong.
'01 Volvo S40 1.8T - Inherited by youngest daughter
'06 Acura TL MBP Navi Camel - Inherited by eldest daughter
GONE - '09 35d Alpine White/Black Sport, Tech, Prem, Ipod, R Climate, No First Aid Kit