okay, my friend wants me to try and find out what is wrong with his sub/box.
he says it is making a weird rattling noise.. he thought the box might have a leak but hes checked and that isnt it (so he says)... he had a mtx thunder 6000, made the noise, sent it in and got a thunder 8000, and now the noise is back... he says when he first put the sub in it was fine, but started rattling after about 2 weeks... thanks
oh yeah he only has one thunder 8000 running off a mtx mono amp if that helps any
Replies (8)
Swez on 10/2/2003 23:01:56
Check the dust cap on the front of the cone for separation. Have to look close to spot these when they first start... but will get progressively worse with time. Poor glue job on the dust cap is a common issue with MTX and other cheaper subs. Can use your finger nail to sweep around the dust cap. If you find a gap or delamination, that's the problem.
You can determine if it is the box or the sub by pulling the sub out of the box and playing low bass at modest levels. If you hear the rattles only in the box, something loose in the box. If you hear it when sub is removed and played in a "free air" scenario, probably the sub.
What size and type enclosure is he using and what size amp... watts RMS involved here?
Swez
ttocs on 10/3/2003 00:53:55
the speaker wire inside of the box could also be "slapping" agianst the sub while it moves.
Relax_The_Mind on 10/3/2003 02:19:14
another hidden cause of rattling is from teh spider coming loose from the frame. ive seen that happen more often than the dustcap coming loose. it is usually caused by not properly breaking in your speakers before pounding away at them.
always break speakers in first...
rtm
Pinch on 10/3/2003 11:51:46
How is the amp connected to the speakers? Maybe the terminal(s) are loose... Also, is there anything inside the box that shouldn't be (like a chunk of MDF or some bits of wire or something).
Pinch
Tray on 10/3/2003 13:24:03
Also,
Try gently pushin in on the sub while it is still in the box.
If you hear a scraping sound, it is blown, and probably due to the scenario RTM mentioned above.
Could also be that he has the same problem I do, and the rattle is from having a screw loose in the brain. Or a few, as in my case.
Hard to tell just by the description of 'rattling'.
heart_beat on 10/4/2003 11:50:33
heres the specs on his sub & amp
the amp runs @ 300W rms
the sub handles 400W rms, 800 max
the box is a magnaform made for an s10.
he says its the sub that is the problem for sure... and thinks its the dustcap. he's tried to heat it up and push it on better, but that didnt help... any suggestions on what to do here?
Swez on 10/4/2003 16:50:16
Usually have to gently pry off the dust cap, clean the old glue residue and reglue it. Removing the old glue can be difficult, but I have found medium grit sandpaper (80-100) will work most times.
As for glues to use, household cement will work as will contact cement. Super glue is too brittle and will eventually fail with cone flexing.
NOTE: Contact cement works very well, but you have to coat the dust cap edge and the spot it will attach to on the cone as well. Let it set ~10 minutes, then guide the cap back into the center and place a small diameter can so that the rim of the can matched the lip of the cap. A pound or 2 of added weight will secure the cap in place until the glue cures.
If you get a little messy with contact cement, it can be removed with Acetone on a Q-tip. Just try a test spot on the back of the cone first to make sure the acetone does no damage to the cap or cone surfaces.
Obviously, if the sub is under warranty, take it back for a new one.
Swez
heart_beat on 10/5/2003 00:27:41
yea its under warranty, hes just a stubborn smarty pants that thinks he can do anything...
thanks for all the help ~murph
he says it is making a weird rattling noise.. he thought the box might have a leak but hes checked and that isnt it (so he says)... he had a mtx thunder 6000, made the noise, sent it in and got a thunder 8000, and now the noise is back... he says when he first put the sub in it was fine, but started rattling after about 2 weeks... thanks
oh yeah he only has one thunder 8000 running off a mtx mono amp if that helps any
Replies (8)
Swez on 10/2/2003 23:01:56
Check the dust cap on the front of the cone for separation. Have to look close to spot these when they first start... but will get progressively worse with time. Poor glue job on the dust cap is a common issue with MTX and other cheaper subs. Can use your finger nail to sweep around the dust cap. If you find a gap or delamination, that's the problem.
You can determine if it is the box or the sub by pulling the sub out of the box and playing low bass at modest levels. If you hear the rattles only in the box, something loose in the box. If you hear it when sub is removed and played in a "free air" scenario, probably the sub.
What size and type enclosure is he using and what size amp... watts RMS involved here?
Swez
ttocs on 10/3/2003 00:53:55
the speaker wire inside of the box could also be "slapping" agianst the sub while it moves.
Relax_The_Mind on 10/3/2003 02:19:14
another hidden cause of rattling is from teh spider coming loose from the frame. ive seen that happen more often than the dustcap coming loose. it is usually caused by not properly breaking in your speakers before pounding away at them.
always break speakers in first...
rtm
Pinch on 10/3/2003 11:51:46
How is the amp connected to the speakers? Maybe the terminal(s) are loose... Also, is there anything inside the box that shouldn't be (like a chunk of MDF or some bits of wire or something).
Pinch
Tray on 10/3/2003 13:24:03
Also,
Try gently pushin in on the sub while it is still in the box.
If you hear a scraping sound, it is blown, and probably due to the scenario RTM mentioned above.
Could also be that he has the same problem I do, and the rattle is from having a screw loose in the brain. Or a few, as in my case.
Hard to tell just by the description of 'rattling'.
heart_beat on 10/4/2003 11:50:33
heres the specs on his sub & amp
the amp runs @ 300W rms
the sub handles 400W rms, 800 max
the box is a magnaform made for an s10.
he says its the sub that is the problem for sure... and thinks its the dustcap. he's tried to heat it up and push it on better, but that didnt help... any suggestions on what to do here?
Swez on 10/4/2003 16:50:16
Usually have to gently pry off the dust cap, clean the old glue residue and reglue it. Removing the old glue can be difficult, but I have found medium grit sandpaper (80-100) will work most times.
As for glues to use, household cement will work as will contact cement. Super glue is too brittle and will eventually fail with cone flexing.
NOTE: Contact cement works very well, but you have to coat the dust cap edge and the spot it will attach to on the cone as well. Let it set ~10 minutes, then guide the cap back into the center and place a small diameter can so that the rim of the can matched the lip of the cap. A pound or 2 of added weight will secure the cap in place until the glue cures.
If you get a little messy with contact cement, it can be removed with Acetone on a Q-tip. Just try a test spot on the back of the cone first to make sure the acetone does no damage to the cap or cone surfaces.
Obviously, if the sub is under warranty, take it back for a new one.
Swez
heart_beat on 10/5/2003 00:27:41
yea its under warranty, hes just a stubborn smarty pants that thinks he can do anything...
thanks for all the help ~murph
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