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Old 05-24-2012, 05:00 PM
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Default Sub Box modification attempt (help)

Ok, so I bought some subs w/ box and have used it pretty much as is since (slight appearance mods, but nothing structurally)

my problem is, I have no place for an amp. it's currently mounted on the back of the box, behind the rear seats (2006 scion xb). basically the amp is overheating due to lack of air flow/space...

current sub setup: (both I would like to upgrade)
2 - 12" audiobahn Q ALUM12N (1000w)
1 - power acoustik 1440 amp

so a friend suggested I reconfigure the box to create a "self cooling" system.
problem is, I have no idea how to properly reconfigure the box so I not only can properly cool the amp, but also have quality sound.

current box:



my thoughts for the new box:

^^(side view) the "amp area" would be added on, keeping the same interior box dimensions and lifting the box a bit higher....


actually pics of the box:


behind the rear seats:

^^ as you can see, very little amp space. seats pretty much (when up) sit on the amp...


^^ugly wiring, but you cant see it....


the possibilitys of the new box is to either have the new "port" faceing the back side of the seats, or to face it towards the trunk w/ vent so the amp is not visible....(its an ugly amp)

I prolly could really simplify this by just floating the amp over the subs, but I dont like the look of the amp. and I'm into car shows, so its all about appearance.
(obviously its just a hobby and for fun, im not too crazy. besides, the car is a daily.)

any help would be appreciated. I am still learning audio and everything involved.
I can pretty much dress up anything, I just need help with a proper design....
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Old 05-24-2012, 05:07 PM
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If your amp is overheating, just turn the gain down. Clipping can easily cause overheating. Plenty of people run their amplifier in a similar spot without overheating problems, so I'll assume it's a tuning issue.

Besides, you can't put an amplifier INSIDE the port of a box. Not only would it restrict airflow and ruin the output, but it would rattle the damn amplifier to pieces, plus the wiring would look atrocious on top of all that.

Let me recap: turn the gain down.
Also, check all your connections. Make sure everything is snug, make sure all your ring terminals are properly crimped or soldered, and make sure your ground is on a well-sanded piece of thick frame metal and not some thin piece of sheet metal with paint on it.
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Old 05-24-2012, 05:10 PM
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well I do know I need new rca audio cables....but those are one the way.
its definitely grounded right. I'll check the gain...
I thought it would be rattled to pieces being mounted on the back of the box??
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Old 05-24-2012, 05:12 PM
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is the gain going to be my HPF, LPF, Bass Boost, or level?
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Old 05-24-2012, 05:15 PM
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Quote:
Originally Posted by waldo View Post
well I do know I need new rca audio cables....but those are one the way.
its definitely grounded right. I'll check the gain...
I thought it would be rattled to pieces being mounted on the back of the box??
what is it grounded to? and is the metal sanded?

Based on your questions you're obviously a novice so I'm making damn sure your ground is done properly. I know in my first couple years I had some pretty poor grounds, but at the time I thought it was done right...

anyway, you can't just modify a box like you originally suggested, you'd have to build a brand new box. The box is not the reason your amplifier is overheating so forget about that for now.

As for having it mounted on the back of the box and rattling... it's not a great spot for that exact reason but lots of people do it anyway, so it's good enough until you do a new setup.
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Old 05-24-2012, 05:16 PM
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Quote:
Originally Posted by waldo View Post
is the gain going to be my HPF, LPF, Bass Boost, or level?
gain is level
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Old 05-24-2012, 05:20 PM
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ok, ground is sanded, and into the body w/ self tap screw...

i'm pretty good with electrical...

ok, level. I'll turn it down.
the reason why I think its the air flow, is whenever I have my rear seat down, the subs hit super hard....but then I put it up, and they hit hard for a while (unless the car is hot) but then they seem to....dim? idk, the power just doesnt seem the same..

maybe its the amp in general? I did buy it from another guy......
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Old 05-24-2012, 05:20 PM
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but just to be safe I'll go back though and double check my ground.....
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Old 05-24-2012, 05:33 PM
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Quote:
Originally Posted by waldo View Post
ok, ground is sanded, and into the body w/ self tap screw...

i'm pretty good with electrical...

ok, level. I'll turn it down.
the reason why I think its the air flow, is whenever I have my rear seat down, the subs hit super hard....but then I put it up, and they hit hard for a while (unless the car is hot) but then they seem to....dim? idk, the power just doesnt seem the same..

maybe its the amp in general? I did buy it from another guy......
no good. the body is sheet metal. you want it grounded directly to the frame. find a bolt on the frame and ground it there.

also, having no air flow could speed up the process of your amp overheating, but the reason it's generating so much heat is almost certainly because the gain is too high and the amp is struggling to make more power than it's comfortable with.
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Old 05-24-2012, 06:42 PM
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ok! I actually ended up moving the ground to the frame due to me breaking off the old screw.....so now its def on a sanded part of the frame...

is it possible that theres something wrong with the amp? it doesnt sound/feel like it's puttin out enough wattage.....sometimes, when I start the car, it'll be freakishly loud...like it suddenly is working correctly and I had the settings turned up from when it wasnt.
could that be a wireing(gauge/quality/wires crossing) issue? broken amp?
guess I just thought it was a cooling issue cause it seemed to useally work properly when its a normal temp out....


I actually just bought a boss bass generator and new rca speaker cable, so that should boost and clarify the signal.
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