BMW 3-Series (E90 E92) Forum - View Single Post - DIY: e90 Base Stereo Upgrade Project - Detailed installation instructions with photos

Rockyz · 10-06-2014, 12:41 AM

Hi guys,

In order to squeeze the subwoofer system cost, i had to look into having the Alpine type R SWR-12D4 instead of the IDQ12. Thanks to kaigoss69.

The IDQ12 is actually double the price of the alpine!

I also found it better fit for the 0.85 cu ft enclose. As per the specs it is best operated in 0.75 to 1.0 cu ft sealed enclosure.

Any comments?

10-06-2014, 12:41 AM	#62
Rockyz Enlisted Member 4 Rep 45 Posts Drives: E90 LCI Join Date: Jul 2014 Location: Egypt iTrader: (0)	Hi guys, In order to squeeze the subwoofer system cost, i had to look into having the Alpine type R SWR-12D4 instead of the IDQ12. Thanks to kaigoss69. The IDQ12 is actually double the price of the alpine! I also found it better fit for the 0.85 cu ft enclose. As per the specs it is best operated in 0.75 to 1.0 cu ft sealed enclosure. Any comments?
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