Truck Bed Rear Window Blow-Through 8-15" American Bass - Car Audio Classifieds!
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Old 11-12-2014, 06:43 PM
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Default Truck Bed Rear Window Blow-Through 8-15" American Bass

Just wanted to throw up a few pics of my build and description of my first big build. I don't have Gobs of money to throw at it but I am willing to modify my vehicle and give up the truck bed. So the equipment is budget level.

VEHICLE: 2007 GMC Sierra 1500 Classic Extended Cab

BOX: Sits in the truck bed extending to cab height with wheel well pockets to maximize space. Rear window is removed and an accordion boot connects the cab to the box front port. So big it only leaves me about 18" at the tail gate to fit cargo!
  • Qty 8: American Bass TNT1544 15" Dual 4 ohm Subs
  • Series Tuned 6th Order Bandpass
  • Rear Chamber
    • 54 Cubic Feet
    • 22 Hz Tuning
    • 442 sq. in. port area
  • Front Chamber
    • 17 Cubic Feet
    • 74 Hz Tuning
    • 867 sq. in. port area
  • Qty: 8 American Bass 15" TNT Subs
  • 1-1/8" Thick Plywood
  • Double Thick Baffles
  • Lots of 1.5" x 1.5" Bracing
  • Fiberglass Cloth Reinforced Panel Spliced Seams
  • Herculiner Finish

ELECTRICAL:
  • Qty 4: Audio Pipe 150001d Amps
  • Dual 270 Amp Alternators
  • Dual 1/0 OFC Welding Cable to Rear Batteries
  • Dual 1/0 OFC Welding Cable Ground from Batteries to Steel Frame
  • Two 90+AH UPS Backup Batteries in the box
  • 1/4" x 1" Electrical Grade 6101 Aluminum Buss Bars
  • 4 GA OFC Welding Cable Direct from Amps to Battery Buss Bars (+12V and Ground)

The Goodies!


Here is the wood all cut up. This was a TON of work. The panels are really heavy.




One picture of the Base Put together. You can see the wheel well cutouts. Also, that's my 12 y/o bass head daughter for scale.


Fast forward a bit and here it is with the upper section done, front port lip, baffles cut etc...







Not a lot has changed except the rear wall has been added. The angled sub baffle has been fitted, glued, screwed, and bondo'd. Most of the Bracing is installed. Sub mounting holes have been pre-drilled...










Next up is finishing the visible interior of the box (BONDO!!!!) and caulking the seams. Then paint to make it look nicer. I thinking a deep blue/purple color inside the box. Then I have to fit the top... My head starts spinning and I don't event know what else but there is a lot left to do.

I also have to design an A-Frame Hoist to lift this thing 8' in the air and lower it into place. It's getting too heavy for me to lift easily. I can still flip it end-over-end but once the top it on that might not be possible.

Let me know if you have any questions and I'll try to answer them.

Thanks!
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  #2  
Old 11-12-2014, 07:34 PM
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Nice man, glad to see someone with a American Bass build using the TNTs, been curious about those subs for a while as something a bit more budget friendly compared to the XFLS (as well as my power I have ava)
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Old 11-13-2014, 04:23 PM
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Thanks man. I'll keep this updated and post some vids and impressions once I get it installed. I heard stuff like the TNT series is American Bass's replacement for their last SQ sub. I'm hoping it will turn out sounding clean and low.

I'm iffy on the frequency this thing will actually be tuned too since there is a large flare due to the 45 degree second baffle. How that plays out with the series tuned sixth I don't know.

I'm going to break the sub in free air 20Hz. I'll hold them at 1/2 excursion for 20 hours then do 20 hours at full xmax. Once they're broken in I'll load the box with them and break out my test gear and see where the box measures outside of the truck.
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Old 11-13-2014, 04:43 PM
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Wow this should get loud for sure. Always wanted to see or hear a build like this as it would be nice to still keep the back seat. Awaiting results for sure
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Old 11-13-2014, 04:57 PM
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Wow! Huge...
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Old 11-13-2014, 05:07 PM
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Looks good so far good luck on the build.
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Old 11-13-2014, 05:11 PM
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LMAO...this is awesome. That's a huge freaking enclosure, and should play down into the teens no problem.
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Old 11-13-2014, 05:26 PM
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What made you choose the tuning and ratio. I dont really see it doing well from mid 30's to high 50's but having very strong lows. Personally i would have tried to get high side tuned a lot lower like 50hz not 74hz. I dont like to cross subs higher than 60hz.
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Old 11-13-2014, 05:36 PM
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Update from Last Night. Added the bracing for the top. Nine Total to match the nine that run from the bottom up to the baffle plane.





Still need to fill some screw holes and sand to make it pretty. The braces are make from 1-1/2" wide wood stock that I routed with a 1/2" round over bit to take off the edges. I like the way it looks and should reduce the air flow disturbance in the port.
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Old 11-13-2014, 08:03 PM
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Very nice build quality
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