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| A Subwoofer Idea-let me know what you think | |
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| Tweet Topic Started: Dec 3 2010, 02:24 AM (1,811 Views) | |
| Jim-Bob | Dec 3 2010, 02:24 AM Post #1 |
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Junkyard Engineer
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I'm an engineering geek ( who delivers pizza) and as such I can't help but try to find efficient ways of working within a given set of parameters. Since this car is being designed (so to speak) around delivery work, I need to maximize the amount of available interior space for hauling pizzas. As such, a speaker box in the cargo area is unacceptable. Still, I want some form of accurate bass reproduction in the stereo I am planning. Here is my solution: Use the space between the outside quarter panel and interior panel in the cargo area on the passenger's side for a box and an 8 inch shallow mount subwoofer. The amplifier could then be mounted next to the seat behind the trim panel and so the interior space is not affected and all that is used is normally wasted space. This idea is not without precedent either as some modern minivans and SUV's use a similar mounting strategy for their premium sound systems. Because of this it may even be possible to find a donor vehicle with a pre-made, space efficient enclosure that could be adapted to the Metro's quarter panel. the same donor vehicle could also provide a flush-mount grille that could be covered in grille cloth to further integrate the sub with the rest of the vehicle's interior. What do you think? Please feel free to cut down this idea if you feel it is untenable or to point out flaws in my logic. |
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| GA Geo | Dec 3 2010, 03:01 AM Post #2 |
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I did something similar with my '90 xfi. First I removed the panels in front and behind the rear seats. Then I used Peel-n-Seal which is a cheap form of Dynamat and lined the whole thing inside closing off the section at the top of the wheel well and the back side of the door sill. After this I made a wooden baffle to mount a 6x9 and screwed it to the back side of the metal frame. Then sealed it off with more Peel-n-Seal and reinstalled the covers. It's not totally sealed but it sounds pretty tight as the body actually flexes when the bass hits and the mid and tweeter play through the stock speaker grill. My amp is mounted under the passenger seat. Totally stealth. Edited by GA Geo, Dec 3 2010, 03:04 AM.
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| Car Nut | Dec 3 2010, 05:46 AM Post #3 |
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Time for Potter to chime in. |
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| mjspiess | Dec 3 2010, 09:15 AM Post #4 |
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I plan on putting an 8" sub on each side of the rear quarter panels. I was going to try to fabricate a wheel well enclosure, but this option looks easier. I'll prob. get to it over Christmas break...we'll see. I was going to just cut a hole in the plastic & mount it to that, but I think I'm going to try the wooden baffle idea first and then cut a hole in the plastic to expose the subs. I think it's a good idea & worth trying. |
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| Jim-Bob | Dec 3 2010, 01:37 PM Post #5 |
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Junkyard Engineer
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You have to think about one thing that you may be forgetting: The gas filler tube runs through the driver's side right where the sub would go and may interfere with the mounting. I haven't taken it apart yet, so I may be wrong ( I am up to my neck in engine parts right now) but I don't think there will be enough space in there. You may have to make an enclosure out of fiberglass to fit the odd space but then you need to use a bit of calculus to calculate the air space. Then again, maybe I am over thinking it. Edited by Jim-Bob, Dec 3 2010, 01:38 PM.
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| Bad Bent | Dec 3 2010, 06:53 PM Post #6 |
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Facetious Educated Donkey
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I did this to my '91...
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| Eric J | Dec 3 2010, 07:33 PM Post #7 |
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Formerly CEJ93
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I have an amplified bazooka tube in the rear of my Mustang that I have been happy with......just a thought. |
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| Alpine | Dec 3 2010, 08:54 PM Post #8 |
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1020cc G10 GOML
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ewwwwwwww |
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| DesmondGhostRider | Dec 3 2010, 09:33 PM Post #9 |
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I have 6x9s mounted in the walls of my rear seats. I just have it hanging with zip ties. I plan on putting a board up and making it a better enclosure eventually. My plan for the sub is to sink it into where the spare goes. Then getting a jeep rear tire mounting thing and put it on the back of the car. I want one of those ones that swings out so that the hatch can still work. Might add a bit of weight...but it should work ok. |
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| GA Geo | Dec 3 2010, 09:37 PM Post #10 |
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Don't laugh. I have two 10" Bazookas with JL subs installed on an old school Phoenix Gold amp in my Metro and they GET DOWN. A front firing ported tube enclosure is more efficient than even a slot ported box. |
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| Potter | Dec 3 2010, 09:49 PM Post #11 |
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Col. Potter
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Yea... NO the sound waves will be trapped in the 1/4 not to mention the flimsy little trim panels will vibrate under the sound pressure of the woofer and sound like poop, also have you leaned against the 1/4s on the car? if their anything like my 89 swift and 94 metro they will flex easly with just (me) 150 lbs on it, so i would also be concerned with them flexing. Alpine... i agree to disagree with you the BTA series of bazooka tubes are JUNK mostly from the amplifiers and their post David Profit design... the amplified tubes do not have the sound of an original 1/2 wave TL enclosure designed by David Profit the creator of Bazooka tubes. that being said I am a HUGE fan of the BT series bazooka tubes. id say a pair of 10" tubes fireing into the corners of the hatch back will provide you with more than enough bass. shoot if your just lookin for good sound and decent bump a single 10" tube fireing into a corner of the hatch will provide suffecent low frequency for music... im more of a sealed box kinda guy cuz i listen to a lot of metal BUT in the GTi im planning 4 10" DVC bazookas witch will be light weight, space saveing BOOM. my personal opinion if you want to splurge and get the DVC model and run a 500 watt rms amp to it a bazooka tube would be the best way to go... a SVC woofer in the tube will hit good as well and still be just as compact. I 100% back Bazooka BT series because they are still designed from Dave's original design. my father is good friends with Dave since he is from Baton Rouge LA and we are from their, one of my most memorable moments was meeting him and talking the tube over. you will find that the engineering of the tube is an efficient way of producing sound pressure and bass frequency in a space saving package. these tubes where designed for Mini trucks with not much room behind the back seat, and small hatch backs so you don't suffer space. Matter of fact David Profit's first 10" prototype was unveiled at an USAICi crank up sponsored by my dads shop... he had 1 tube with a Rockford Fosgate Punch 45 amp an Isuzu Impulse (Geo storm ) and my dad said it would hit as hard as a single 15"Ive installed MANY of tubes, i had 4, 10" Bazookas in my Isuzu single cab pickup (my first vehicle) and that baby would ROCK... i also wired one of bazookas sponsor vehicles. a hard body extended cab Nissan truck that housed 16 10" tubes that would HUM 168 DB. so all you need, 1 BT series Bazooka tube, a trustworthy amp that is trusted with their wattage ratings, THD ratings and their full of guts and not all case.(i suggest Rockford Fosgate, Hifonics, MTX, Audio Pipe ect... something with a good rep trust me you dont want to skimp on the amp) point it at the corner of the hatch and you'll be set. my $.02 |
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| GA Geo | Dec 3 2010, 10:10 PM Post #12 |
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I have the old RS enclosures which is the same as the BT. I have ran these tubes in almost every vehicle I've ever owned. The subs that come in them are not for serious power handling but with a good quality sub they are hard to beat. The ones in the Metro are dual 2ohm wired in parallel both ran to bridge mode on the PG. It's a .5 Ohm load. Do not underestimate these enclosures. |
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| Potter | Dec 3 2010, 10:22 PM Post #13 |
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Col. Potter
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matter of fact, MTX sledge hammer, Subzone slolt ported, Probox Ground Pounder boxes are all designed off of the Bazooka tube formulas... they still aren't as compact as the patented tubes but their close. but as you said in your next post DO NOT UNDERESTIMATE THESE ENCLOSURES!!!
Edited by Potter, Dec 3 2010, 10:24 PM.
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| mjspiess | Dec 3 2010, 10:24 PM Post #14 |
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I'm not concerned at all. I'm hoping they'll pop out all my dents for me
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| GA Geo | Dec 4 2010, 12:36 AM Post #15 |
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The more layers of soundproofing you use the less flexing you will have. I even thought about using spray on bedliner or undercoating but I didn't want to wait on it to dry. |
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) and my dad said it would hit as hard as a single 15"
9:14 AM Jul 11