Hey everyone hows it going,
I just have two quick questions.
First question,
I was wondering if MDF thickness really makes that much of a difference. Currently I have a 12" sealed box from Future Shop and after I bought it I realized that it was 9/16" MDF not 3/4" as most sub boxes are. (Thats probably why it was cheaper lol) The internal volume of the box is approx. 1.15 Cubic feet, and the sub in it is a 12" Alpine Type S.
Second question,
Does anyone have any tips on stoping or dimishing trunk rattling. When I put pressure on the tail light area or hold onto my trunk rack thingy it stops. Is there a way that I could stop that perminately, without using dynomat?
Thanks for the help,
Murph
Replies (5)
swez on 03/4/2004 12:26:39
1. For a single sub, <300 watts RMS, 5/8" (9/16" in non-standard lumber dimension) thickness is OK.
2. Tail light rattles can be quieted with silicone sealer. Trunk lid rattles usually need some kind of mass building materials to tone that down. Dynamat is expensive, but other brands work well too. Even a tough coat truck bed liner spray will help.
Swez
cplkittle on 03/4/2004 12:34:58
MDF thickness will improve the sound of your enclosure if what you have now flexes when the bass hits. A custom enclosure should be built thick enough that this does not happen. I only use 1/2" MDF on cheap 10's if all sides of the box are smaller than 12"x12". I was not aware that there was a 9/16" MDF. most of the time is bought in 1/2, 5/8, 3/4, or 1". If your enclosure flexes, that only increases backwaves and returns the pressure onto the cone of the sub.
Dynamat is an excellent sound dampener as far as rattles go. If you don't want to use dynamat, take your tail light assembly off completely and retighten all screws, and replace all of the gaskets and rubber seals. This MIGHT help for a while, but there is no gurantee. Some people use expanding foam in the trunk lid SPARINGLY. You can damage the trunk if you use too much in a closed off area, not to mention the mess it makes.
Murph on 03/4/2004 13:36:41
How would I know if my box was flexing when the bass hits?
Murph
cplkittle on 03/4/2004 17:20:09
Find a song that has alot of hard hits in it, not low reverb, but punches. Put a quarter on the center of the largest surface area of the box. if the quarter moves, not jumps, you are ok. If it jumps over 1/2 an inch the box is flexing too much. You should be able to see the box flex looking down the top or side of it when the bass hits.
Murph on 03/5/2004 09:16:51
Thanks I will try that today.
Murph
I just have two quick questions.
First question,
I was wondering if MDF thickness really makes that much of a difference. Currently I have a 12" sealed box from Future Shop and after I bought it I realized that it was 9/16" MDF not 3/4" as most sub boxes are. (Thats probably why it was cheaper lol) The internal volume of the box is approx. 1.15 Cubic feet, and the sub in it is a 12" Alpine Type S.
Second question,
Does anyone have any tips on stoping or dimishing trunk rattling. When I put pressure on the tail light area or hold onto my trunk rack thingy it stops. Is there a way that I could stop that perminately, without using dynomat?
Thanks for the help,
Murph
Replies (5)
swez on 03/4/2004 12:26:39
1. For a single sub, <300 watts RMS, 5/8" (9/16" in non-standard lumber dimension) thickness is OK.
2. Tail light rattles can be quieted with silicone sealer. Trunk lid rattles usually need some kind of mass building materials to tone that down. Dynamat is expensive, but other brands work well too. Even a tough coat truck bed liner spray will help.
Swez
cplkittle on 03/4/2004 12:34:58
MDF thickness will improve the sound of your enclosure if what you have now flexes when the bass hits. A custom enclosure should be built thick enough that this does not happen. I only use 1/2" MDF on cheap 10's if all sides of the box are smaller than 12"x12". I was not aware that there was a 9/16" MDF. most of the time is bought in 1/2, 5/8, 3/4, or 1". If your enclosure flexes, that only increases backwaves and returns the pressure onto the cone of the sub.
Dynamat is an excellent sound dampener as far as rattles go. If you don't want to use dynamat, take your tail light assembly off completely and retighten all screws, and replace all of the gaskets and rubber seals. This MIGHT help for a while, but there is no gurantee. Some people use expanding foam in the trunk lid SPARINGLY. You can damage the trunk if you use too much in a closed off area, not to mention the mess it makes.
Murph on 03/4/2004 13:36:41
How would I know if my box was flexing when the bass hits?
Murph
cplkittle on 03/4/2004 17:20:09
Find a song that has alot of hard hits in it, not low reverb, but punches. Put a quarter on the center of the largest surface area of the box. if the quarter moves, not jumps, you are ok. If it jumps over 1/2 an inch the box is flexing too much. You should be able to see the box flex looking down the top or side of it when the bass hits.
Murph on 03/5/2004 09:16:51
Thanks I will try that today.
Murph
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