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Old 07-02-2005, 03:12 PM   #1
Gothy
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Custom L7 box questions

I'm currently working on building a 2.2 CF sealed box for my 12" L7. So far, the box is constructed. I used 3/4 MDF, E6000 industrial strength glue, some screws near the corners, and caulked the inside of the box. My questions are:

1. my terminal cup has no screw holes. will the glue be enough to hold it in?
2. Is it a good idea to coat the box in fiberglass resin jelly to keep it strong and air tight, as well as paintable?
3. I planed to use the screws to mount the sub that were with my ported box. I think they're 1". Is this ok?
4. Do I really need to use all 8 screws when mounting the sub, since I plan to use Liquid Nails when I mount it? The only reason I worry is because I have about 1/4th of an inch of MDF on the top and bottom before it joins the other sheet of wood. I'm afraid of splitting the panel that connects to the pannel I'm mounting to.


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Old 07-02-2005, 03:25 PM   #2
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Re: Custom L7 box questions

Quote:
Originally posted by Gothy

1. my terminal cup has no screw holes. will the glue be enough to hold it in?

It should. Terminal cups usually leak air anyways. For all of the installs I've ever done (I've done tons, I do it for a living) I don't even use terminal cups. Simply drill a hole the size of the speaker wire, run the wire in the box, then silicone the hell out of it. Do it good and guarentee no leakage.


2. Is it a good idea to coat the box in fiberglass resin jelly to keep it strong and air tight, as well as paintable?

if the box was built well you shouldn't have to, but if you have any doubts you may as well do it. Strength isn't really an issue, honestly. Getting 3/4" MDF to flex is nearly impossible, and with a single L7 you will be fine.

3. I planed to use the screws to mount the sub that were with my ported box. I think they're 1". Is this ok?

Yes, those will work fine.

4. Do I really need to use all 8 screws when mounting the sub, since I plan to use Liquid Nails when I mount it? The only reason I worry is because I have about 1/4th of an inch of MDF on the top and bottom before it joins the other sheet of wood. I'm afraid of splitting the panel that connects to the pannel I'm mounting to.

Yes, you need to. You need all 8 screws to make sure that the subwoofer is 100% air tight. I WOULD NOT USE LIQUID NAILS TO HOLD THE SUBWOOFER ON. There is no point in doing this! If you are worried about air leaking, go get some thin weatherstripping from your local ardware store and put it around the mounting ring on the subwoofer. Use all 8 screws, it will be plenty. My subwoofers weigh 65 pounds each, and the screws are plenty to hold them. Just predrill the holes and you should have no worries of it splitting.
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Old 07-03-2005, 06:19 PM   #3
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only 65 pounds? Mine weigh 95 ;-P
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Old 07-03-2005, 06:53 PM   #4
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And anyone who knows about subs knows that weight alone cannot determine how good sounding/loud a subwoofer can get. More weight does not equal better.
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Old 07-03-2005, 08:01 PM   #5
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I think he was just having fun with the weight.
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Old 07-03-2005, 08:08 PM   #6
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Quote:
Originally posted by FocusInCali
I think he was just having fun with the weight.
Yah it's been a long day. But in that case, our 1987 Chevy van is better then a Corvette!
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Old 07-03-2005, 09:17 PM   #7
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Great on high-speed curves too!
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Old 07-06-2005, 12:53 AM   #8
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200 bucks says my gremlin takes your van.



On a side note. Not wieght isnt everything, but your speakers are gonna be heavy if they are worth a shit. Small ass magnets = Small ass bass. Thats not saying a 90 pound sub is better than an 80 pound sub as some subs have less "show" stuff built on which can save some weight.

I have yet to see a Good sub with a Small magnet. You dont see good subs with the same size magnet you see on Sony 6.5"'s lol.
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Old 07-06-2005, 09:34 AM   #9
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I tend to disagree. On the whole, yes, a larger magnet will create a larger magnetic field, which helps the speaker's voice coil. Though, there was a company that used to be on the market, maybe 2-5 years ago. Their 2nd Gen speakers only had a 85oz magnet, and they were pulling in the numbers. The company was called Atomic Thunder - not to be confused with Atomic Loudspeakers. The company no longer exists, and the head now works for Earthquake Sound i believe... The speakers were amazing. They cost $180 retail (15"), and $160(12"). they were plain jane, but cars were doing 160+... their extreme 1-2 was doing high 160's/low 170's...

like i said, i agree mostly, but always like to throw a monkey wrench in there.

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Old 07-06-2005, 09:45 PM   #10
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Well i didnt mean it that it was IMPOSSIBLE to do, but 99.9% of every good smashing sub has a gigantor magnet.
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