Subs in the rear deck
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From: 650 (SC_RWC) CA
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Subs in the rear deck
Now I'm seeing more and more peeps puttin subs in the rear deck. now what's the advantage to this, soundwise? Is there one? Wouldn't shiot rattle like crazy back there? Liek the widow and everything else? So how does this work?
i boogie for the raindrops
Joined: Oct 2001
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From: Jackson, Mississippi
Rep Power: 0 its a LOT more complicated than one would think
its called IB, or Infinite baffle
when the airspace provided exceeds 4x the sub's VAS, its considered IB
the only thing is, the front wave of the speaker has to be 100% separated from the back wave, meaning the trunk area has to be sealed off extremely well from the cabin. usually takes a lot of fiberglass and expanding foams around the seams of your trunk.
Benefits - extreme low end response, super high efficiency, very good transient response
cons - not suited for the basshead, easy to blow drivers, easy to make it sound like butt, tkes a LOT of work to seal off the cabin correctly...
its called IB, or Infinite baffle
when the airspace provided exceeds 4x the sub's VAS, its considered IB
the only thing is, the front wave of the speaker has to be 100% separated from the back wave, meaning the trunk area has to be sealed off extremely well from the cabin. usually takes a lot of fiberglass and expanding foams around the seams of your trunk.
Benefits - extreme low end response, super high efficiency, very good transient response
cons - not suited for the basshead, easy to blow drivers, easy to make it sound like butt, tkes a LOT of work to seal off the cabin correctly...
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From: MA
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Yeah, much agreed IB is a huge pain in the ***! You need to be pretty serious about wanting it to go through with it. It is not something that you should just do cuz other peeps are doing it. If you're gonna do it, you should seek out an installer thats done it before, preferably a couple times. Like Lud said, its tricky, you need to plug every hole, space etc - every spot thats a potential bleeder.
You could also still have your subs firing in your cabin through the rear deck with an enclosure. You could build an enclosure up to the rear deck and just have your sub firing through. If you wanna do this, I recommend you do not have the sub installed over the deck and into the box. Just install the sub into the enclosure like normal and cutout a section of the rear deck for it to fire through. Grille it and cover it for a nice stealth install - sweet.
You could also still have your subs firing in your cabin through the rear deck with an enclosure. You could build an enclosure up to the rear deck and just have your sub firing through. If you wanna do this, I recommend you do not have the sub installed over the deck and into the box. Just install the sub into the enclosure like normal and cutout a section of the rear deck for it to fire through. Grille it and cover it for a nice stealth install - sweet.
Registered!!
Joined: Mar 2004
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From: Northern MA
Rep Power: 0 Wow. I didn't know it was that complicated. Maybe I should do the DYI on replacing the springs in the trunk and do like J187 said and make a box in the trunkthat fires up through a hole in the deck. So for an infinte baffle if my vas is 5.81 cuft I need a 23.25 cuft box? How big is our trunk 
Last edited by tbaleno; Oct 8, 2004 at 09:58 AM.
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Rep Power: 323 a friend of mine who got me into car audio back in 1995 was doing a custom install on his 89 Prelude back in 1996 - he was trying to use a JL 10W0 (currently boxed and in my 2K1 Vic) as an open air sub by mounting it to the metal brackets in the rear seat cage.
It didn't work well - rattled and the overall response was like *** for the most part (although it did hit good lows, unfortunately you didn't feel it). I can appreciate the theory of using a sealed trunk. Don't you need a sub specifically designed for open air to do this right?
It didn't work well - rattled and the overall response was like *** for the most part (although it did hit good lows, unfortunately you didn't feel it). I can appreciate the theory of using a sealed trunk. Don't you need a sub specifically designed for open air to do this right?
i boogie for the raindrops
Joined: Oct 2001
Posts: 4,497
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From: Jackson, Mississippi
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Originally Posted by tbaleno
Wow. I didn't know it was that complicated. Maybe I should do the DYI on replacing the springs in the trunk and do like J187 said and make a box in the trunkthat fires up through a hole in the deck. So for an infinte baffle if my vas is 5.81 cuft I need a 23.25 cuft box? How big is our trunk
i boogie for the raindrops
Joined: Oct 2001
Posts: 4,497
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From: Jackson, Mississippi
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Originally Posted by coop
a friend of mine who got me into car audio back in 1995 was doing a custom install on his 89 Prelude back in 1996 - he was trying to use a JL 10W0 (currently boxed and in my 2K1 Vic) as an open air sub by mounting it to the metal brackets in the rear seat cage.
It didn't work well - rattled and the overall response was like *** for the most part (although it did hit good lows, unfortunately you didn't feel it). I can appreciate the theory of using a sealed trunk. Don't you need a sub specifically designed for open air to do this right?
It didn't work well - rattled and the overall response was like *** for the most part (although it did hit good lows, unfortunately you didn't feel it). I can appreciate the theory of using a sealed trunk. Don't you need a sub specifically designed for open air to do this right?
I forgot the exact values, but the qts has to be higher up.
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