Regular cab build

[vanillachocolat]

I got a new 2003 Silverado base model a little earlier this year. And now I'm starting to look ahead on where my money will be to upgrade my audio. I'm looking to build a box that goes all the way across the cab to fit two regular size subwoofers behind each seat with enough CU of air in each chamber to meet the sugguestions. This is my first build in my first car. I'm not so much going for loudness as I am for sound quality. I've added Polk Audio Dxi650's in the doors. And I'm going to add Polk Audio Dxi400s in the rear pillar location. Im looking to get Sundown Audio SA-12s. Im looking to any sub, amp, and enclosure reccomendations from you guys. Thanks.

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[flgators 10+ year member]

you could do 2 sa 12's sealed or 1 properly ported, depending on if you like sealed or ported better

 

[vanillachocolat]

I'm wanting to do sealed in a slanted box all the way across the back of the cab. Inside it should be plenty loud enough without the ported box.

 

[Danometal 10+ year member]

Another difference in sealed vs. ported, aside from the output gain with ported, is the frequency response curve. I'm in the minority here, as I like to tune in the 20s, but most here tune in the mid 30s, which causes a hard peak around 40-50 hz, and a steep roll off below that, causing the lows to suffer greatly (the severity of this behavior varies from sub to sub). To my ears, this sounds like yesterday's trash as far as SQ goes. Been there. Done that.

Sealed has a roll off that starts much higher, but it's not near as steep. Often the cabin gain of a vehicle meshes well with the gradual roll off of a sealed sub and sounds fairly flat, thus the common reputation of sealed subs for SQ applications. However, I contend that a very low tuned ported design actually sounds superior to its sealed counterpart.

BTW, I love Polk's DXI line. Great speakers.