HELP ME PLEASE!? Kicker L7 making "Rattling sound"

[ktwagner 10+ year member]

well i didnt know that when i oght the box....... i had sheets om mdf but the rain ruined it... any suggestions on ware i might find one? not the best box builder lol

 

[ktwagner 10+ year member]

the web ware i bought the box from said its 3.2 Cu. Ft. Per Chamber

 

[ktwagner 10+ year member]

thik i found one its called Audio Enhancers KPL15S Unloaded Sub Box Ported 15 Inch Kicker L7, L5. on hifisoundconnection dims:W 35 H 17 TD 20 1/4 BD 20 1/4

 

[akheathen Premium Member]

well, prefab boxes aren't really ideal, or suggested. however, that one is 3/4" mdf, and will work a lot better. what i can see, is that the port is a tad on the small size (but tuned to a good frequency), and you should probably put in some bracing

 

[ktwagner 10+ year member]

what do you mean "bracing"

well, prefab boxes aren't really ideal, or suggested. however, that one is 3/4" mdf, and will work a lot better. what i can see, is that the port is a tad on the small size (but tuned to a good frequency), and you should probably put in some bracing

 

[matt_bennett05 10+ year member]

I want to say that you will have to go do a dentist for proper bracing but use ~1" dowels from a hardware store and give your box extra support on the longer sheets of wood (internally)

 

[ktwagner 10+ year member]

and how do u know its tuned to a good frequency?

 

[matt_bennett05 10+ year member]

and how do u know its tuned to a good frequency?

You have to know the math of box building really well... most of the guys here (like RAM) can tell you these things... just find someone knowledgable enough and hit 'em up w/ your ?'s

 

[akheathen Premium Member]

running the numbers, it comes out to 34hz, which is a tad on the lower side for the sub, but within range. yes, you can use dowels in the large plain, but on top of that, you put little triangles of mdf where 2 sides meet, to help strengthen. if you still have that damaged wood, there may be some small amout of un-swelled wood in the middle, that would be perfect for chopping into triangles. if not, maybe a cheap 2x4 or scrap mdf? just something strong enough..

 

[ktwagner 10+ year member]

yeah. and what do u mean by dowels? so just should put some supports in the corners and stuff

 

[akheathen Premium Member]

dowels, are pretty much the same as closet rods, just smaller...... you put them across the inside of the bod on large planes to keep it from flexing. look in the enclosure section, and you can see some in the 4th order 16-12's thread..

 

[macisme 10+ year member]

I didn't read through this whole thread, but want to just put my experience out there. I have had 6 different L7 15's, and 3 of them at some point had a odd rattle. It was due to a broken piece of glue being inside the cone space... taking the woofer out of the box and flipping it around would tell you if there was a piece of this glue in there moving around.. It's almost like a piece of glass. I had to cut it out of my last ones and epoxy over the hole... reason for this was because I didn't want to risk getting anything stuck down by the motor, and it was easy to just cut open a flap, extract the loose piece and just epoxy the flap closed again. Never had another problem like that again.

 

[ktwagner 10+ year member]

the "Rattling" on my sub wasnt the sub at all is was my spare tire about to fall off lol but thanks

I didn't read through this whole thread, but want to just put my experience out there. I have had 6 different L7 15's, and 3 of them at some point had a odd rattle. It was due to a broken piece of glue being inside the cone space... taking the woofer out of the box and flipping it around would tell you if there was a piece of this glue in there moving around.. It's almost like a piece of glass. I had to cut it out of my last ones and epoxy over the hole... reason for this was because I didn't want to risk getting anything stuck down by the motor, and it was easy to just cut open a flap, extract the loose piece and just epoxy the flap closed again. Never had another problem like that again.

 

[armyatc 10+ year member]

whoops,
the spider is the black thing just below the cone,

whats the cone?

 

[akheathen Premium Member]

whats the cone?

the big cone shaped thing that moves and makes the boom