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assistance with box


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Maxst 
Silver - Posts: 866
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Joined: June 06, 2003
Location: United States
Posted: November 13, 2003 at 9:08 PM / IP Logged  

Ok..start out with what i have.

two MB quart 12" subs in a sealed 1cu foot box, going to be in a 94 accord.

1: Now i heard that in that style of accord its best to point the subs up at the rear deck, is this true...if so read on, if not suggest which way.

2: i want to seal the box from the trunk..leaving the 6x9's in the trunk area, would that be wise? you see what im getting at?

third and final: will the top board need bracing and will it effect the sound produce by the subs?

THESE SUBS ARE LOW POWER...ONLY 150RMS.

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auex 
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Joined: December 23, 2002
Location: Arizona, United States
Posted: November 13, 2003 at 9:20 PM / IP Logged  
First thing you should do for question 1 is use a box that is similar to what you would be building and play with them in the trunk to actually see what sounds best to you. How would you be sealing the subs from the trunk when firing the subs toward the rear deck, taking into consideration that you are trying to isolate the subs from the 6x9? Would you be porting the enclosure through the rear deck or come up with some other way of doing this? For question 3, it is always a good idea to use a brace in an enclosure, but sometimes it is unnecessary.
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Maxst 
Silver - Posts: 866
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Posted: November 13, 2003 at 9:29 PM / IP Logged  

box is being built..it is what MB quart says it does best in.

im going to make a hood if you will...and have it sealed up to the area around the seat. Make it look like the trunk is really smaller..wall it off.

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bberman1 
Gold - Posts: 2,314
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Joined: March 11, 2002
Location: United States
Posted: November 13, 2003 at 9:59 PM / IP Logged  

You will probably get better sound if you have them firing into the trunk (without your hood) in a sealed enclosure. Then build a vent in the rear deck or seat so the trunk can vent into the cab. If it were me I would ditch the exterior hood idea. But if you don’t mind me asking what is you objective with the hood/external enclosure? Are you trying to push as much bass into the cabin as possible?

Maxst 
Silver - Posts: 866
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Posted: November 13, 2003 at 10:05 PM / IP Logged  

i was thinkin to put seal them off from the trunk to keep rattles out..try to..but it looks like alot of work.i think ill have them face the trunk opening.

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bberman1 
Gold - Posts: 2,314
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Posted: November 13, 2003 at 10:16 PM / IP Logged  

No matter what contraption you build your going to have rattles. If you want to eliminate the rattles use Dynamat or I would suggest Brown Bread. You can do your whole trunk for about $150.00 in Brown Bread. As far as my vent suggestion I would still suggest you make a vent, it allows the trunk to breath and gives you the effect of putting down your seats.

forbidden 
Platinum - Posts: 5,352
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Joined: November 01, 2003
Location: Alberta, Canada
Posted: November 13, 2003 at 10:54 PM / IP Logged  
Some excellent suggestions, make sure you protect your 6x9's from the shock wave of the subs, you can pick up some foam or plastic baffles really cheap from your local shop, thay do an excellent job of keeping the subs from interfering with the 6x9's.
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Maxst 
Silver - Posts: 866
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Joined: June 06, 2003
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Posted: November 14, 2003 at 9:30 AM / IP Logged  

im going to use peel n seal, right close to a home depot and stuff. i dunno yet tho....

got me thinking on the vent idea. my amp is on the seat, so the arm rest vent is out.  Cutting alot of metal would be necessary to do this as well, now that i think of it.

forbidden: you talking about the little plastic cup things you drop in the mounting area then the speaker? 

Also the 6x9's are playing bass notes- trying to do what the subs are playing and its annoying.  i cant firgure out how to stop it. I went thru alot of settings on my cd player...deh-p6500 pioneer, and turned up nothing.  i thought since i have the rca in the sub out rca, the bass signals would only be sent to the subs. How do I stop it?

I need quality equipment, feel free to donate.
forbidden 
Platinum - Posts: 5,352
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Joined: November 01, 2003
Location: Alberta, Canada
Posted: November 14, 2003 at 12:00 PM / IP Logged  
Exactly what the Dr. ordered, this little plastic or foam "hats" keep the shock wave of the subs from interfering with the motion of the 6x9's woofer. To help keep the damaging bottom end out of the 6x9's either amplify them and use the hp xover, or if you are going to continue to run the 6x9's off of deck power, you can add a passive crossover, a minimum of 6db per octave, by adding a capacitor inline on the positive speaker lead. If you look at the 6x9's tweeter, it has a small one on it (in most cases). Have a look at the passive crossover chart on this site to help you choose the appropriate value.
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auex 
Platinum - Posts: 5,041
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Joined: December 23, 2002
Location: Arizona, United States
Posted: November 14, 2003 at 1:35 PM / IP Logged  
If you are trying to get the bass out of the 6x9's you could/should use a cap. IMO you will never completely get the subs away from the other speakers in the car. The pressure from the bass will still affect the speakers, even if the bass is only in the cab of the vehicle. As far as the foam "cups" go, they would be the easiest. You could also rebuild the rear deck and go with some other speakers, 6's, 8's, or stick with the 6x9's.
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Always check info with a digital multimeter.
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I've been sick lately, sorry I won't be on much.
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