Re: Question about subs under the seat? In a extended cab. 08 gmc Sierra
With only 1k rms I would shy away from hdc's as you will barely get them moving. I'm a big fan of 8's so I would do a 4th order for 2 SA's .8 sealed 2 ported around 48. Should get loud and have a great bandwidth while using the power you have quite well.
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