hey guys i was buying a ED A15 sub for my truck... howvere recently my current ED 12kx driver seems to have some less then pleasing things happening to it... some part of it now rattles at low frequencies... i tried a new box new wiring and a differnt vehicle. its literaly tyhe speaker rattling and my warranty is up... and i worry a bnit spending 300+$ for the A series now that this has happened...
my new interested is adires brahama series... from what i have read and heard here and other places is they are amazing... i worry though that the wont have the high SQ i love. can anyone vouch for there SQ performance.
Replies (10)
swez on 08/24/2004 08:23:05
Oh yes, check your dust cap for rattles. These come unglued sometimes in small areas and will rattle. You can use a long soda straw or a piece of small diameter tubing to locate the rattle and re-glue it. (sorta like a cheap stethoscope)
Brahma SQ, no problem there. They are designed to get loud, stay linear and take pretty good RMS power too. I believe they are rated at 1600 RMS voice coils power handling. But these subs have such a high cone excursion, they can reach X-max with less power. It all depends on the enclosure design used. I would think this sub would be killer in a transmission line port enclosure.
Swez
uochronos on 08/24/2004 15:29:40
its one of the flat cone designs from ED so the whole cone is one piece... nothing to glue back down theer swez unfortunatle... i'm really quite confused on what it is rattling really. i took it out and studiede it for loose parts or parts that are touching and i couldnt seem to find any. i thought maybe it was wire slaping against the spider or soemhting but i changed the wiring and it still makes an identical sound... its not really a loud sound either and it does not sound like its causing the sub to work in properly but it is anoying.
swez on 08/24/2004 18:39:54
Try inspecting the spider/coil interface too. Gently lift up the cone and obserserve for ANY separations between coil and spider. If you see one, can re-glue it with epoxy in a small syringe, let cure overnight and try it again.
Swez
uochronos on 08/25/2004 02:04:27
i gave it a good once over and didnt see anything since its a flat cone i can see everything really well lots of space. everything seems up and up. but i well give here another inspection... i think it may have been doing this since the beging though and i just noticed it my buddy said in my wifes car he heard it too. i think i just noticed when i put it in my truck and had to hear every day.
perhaps gthe box has a leak and thats cayuseing lack of back preasure or something. the box is sort of jimmy riged i well try getting it in a proper box and see if that helps.
swez on 08/25/2004 09:04:05
Does this sound appear at low & high SPL? If at high only, could be a leaky box allowing X-max to be reached soon. When a sub reaches X-max and beyond, cone whopping or lead slap is common.
If you hear this at low volume, wonder if the coil is slightly out of alignment? This can cause scraping and skuffing sounds. It may be a defective sub too.
Swez
uochronos on 08/25/2004 12:04:37
its only at medium to high volume... i well throw it in another box see what i get...
if the coil was out of alignment wouldnt i see scraps along it somwhere most likly? if so i well check that as well when i pull it out.
swez on 08/25/2004 12:53:13
Nope, the scrapes are below the spider and cannot be seen unless the sub is disassembled. You may feel scrapes if you manually motivate the cone in and out, but if the box is wrong for the sub, it may have bottomed out and bent the lower part of the coil bobbin.
Also, if the magenetic pole piece is out of normal tolorances, it can make noise as well. The air gap is fixed between the coil and pole piece, but a drop of the box can knock the pole piece out of position as well. This can create mechanical noises too. That's factory repair job.
Swez
uochronos on 08/25/2004 22:10:08
i took the sub out and manulay moved the sub in and out (gently) and it did not make any sounds that where sfcraping or rough... and i'm sure it did not bottom out i think the sound may be over excursion as you mentioned from the air leaks... the poroblem is i put a 2.5" baffle between the sub and the box to make the sub fit the box. it just barly touched the back of the box before the baffle.
so i well build it a more suitable box. this week end and hopefully it well sound better.
swez on 08/26/2004 19:54:41
Here's how to diagnose a blown/damaged woofer:
1. Some sound, but lots of rubbing scraping is heard. Voice coil was burned or charred... Can hear scratching/rubbing sounds, when you manually pump the cone, with no power to sub. You may even be able to smell something like burnt plastic or wire insulation. Too much power, will give this result.
2. No sound ... separated voice coil wire or tinsel lead pulled away from VC. Mechanical failure, as too much input power, excess bass boost or Xmax exceeded due to wrong enclosure specs.
3. Buzzing or rattling sounds, (while sub is playing at moderate to loud SPL)... Loose dust cap, spider, VC separated from cone or surround is separating from cone. This is usually caused by fatigue, aging woofer or poor assembly at factory. User repairs are often possible here. A little Super Glue or contact cement, will do the trick here.
4. Seized cone, some sound, but very poor bass output, the cone will not move manually or with power applied... In this case, the VC has jumped the gap, and is locked into a frozen position, outside the gap. You may try manually re-inserting the cone/VC, back into the magnetic gap. This is caused by excess bass boost, wrong box specs and over excursion (Xmax exceeded) When this happens, you may have to repair or replace the sub, as the VC may have been damaged and scrapes the pole piece.
Swez
If it ain't broke, you're not trying hard enough
snipe523 on 08/27/2004 11:43:00
Definately try another box to see what happens. Could possibly be the weave coming loose from the honeycomb part of the cone. I think I heard of one or two other people having this happen. It's one of those freak things that next to no one has happen. The weave is actually just like a covering for the honeycomb part and if it comes loose at all could be flapping slightly at higher voumes causing the "rattle" sound. Just a question though. Did you buy this speaker used? As far as I knew all eD speakers come with their 3 year warranty. So if you bought it new you should still be under warranty as those subs haven't been around for more than a year.
my new interested is adires brahama series... from what i have read and heard here and other places is they are amazing... i worry though that the wont have the high SQ i love. can anyone vouch for there SQ performance.
Replies (10)
swez on 08/24/2004 08:23:05
Oh yes, check your dust cap for rattles. These come unglued sometimes in small areas and will rattle. You can use a long soda straw or a piece of small diameter tubing to locate the rattle and re-glue it. (sorta like a cheap stethoscope)
Brahma SQ, no problem there. They are designed to get loud, stay linear and take pretty good RMS power too. I believe they are rated at 1600 RMS voice coils power handling. But these subs have such a high cone excursion, they can reach X-max with less power. It all depends on the enclosure design used. I would think this sub would be killer in a transmission line port enclosure.
Swez
uochronos on 08/24/2004 15:29:40
its one of the flat cone designs from ED so the whole cone is one piece... nothing to glue back down theer swez unfortunatle... i'm really quite confused on what it is rattling really. i took it out and studiede it for loose parts or parts that are touching and i couldnt seem to find any. i thought maybe it was wire slaping against the spider or soemhting but i changed the wiring and it still makes an identical sound... its not really a loud sound either and it does not sound like its causing the sub to work in properly but it is anoying.
swez on 08/24/2004 18:39:54
Try inspecting the spider/coil interface too. Gently lift up the cone and obserserve for ANY separations between coil and spider. If you see one, can re-glue it with epoxy in a small syringe, let cure overnight and try it again.
Swez
uochronos on 08/25/2004 02:04:27
i gave it a good once over and didnt see anything since its a flat cone i can see everything really well lots of space. everything seems up and up. but i well give here another inspection... i think it may have been doing this since the beging though and i just noticed it my buddy said in my wifes car he heard it too. i think i just noticed when i put it in my truck and had to hear every day.
perhaps gthe box has a leak and thats cayuseing lack of back preasure or something. the box is sort of jimmy riged i well try getting it in a proper box and see if that helps.
swez on 08/25/2004 09:04:05
Does this sound appear at low & high SPL? If at high only, could be a leaky box allowing X-max to be reached soon. When a sub reaches X-max and beyond, cone whopping or lead slap is common.
If you hear this at low volume, wonder if the coil is slightly out of alignment? This can cause scraping and skuffing sounds. It may be a defective sub too.
Swez
uochronos on 08/25/2004 12:04:37
its only at medium to high volume... i well throw it in another box see what i get...
if the coil was out of alignment wouldnt i see scraps along it somwhere most likly? if so i well check that as well when i pull it out.
swez on 08/25/2004 12:53:13
Nope, the scrapes are below the spider and cannot be seen unless the sub is disassembled. You may feel scrapes if you manually motivate the cone in and out, but if the box is wrong for the sub, it may have bottomed out and bent the lower part of the coil bobbin.
Also, if the magenetic pole piece is out of normal tolorances, it can make noise as well. The air gap is fixed between the coil and pole piece, but a drop of the box can knock the pole piece out of position as well. This can create mechanical noises too. That's factory repair job.
Swez
uochronos on 08/25/2004 22:10:08
i took the sub out and manulay moved the sub in and out (gently) and it did not make any sounds that where sfcraping or rough... and i'm sure it did not bottom out i think the sound may be over excursion as you mentioned from the air leaks... the poroblem is i put a 2.5" baffle between the sub and the box to make the sub fit the box. it just barly touched the back of the box before the baffle.
so i well build it a more suitable box. this week end and hopefully it well sound better.
swez on 08/26/2004 19:54:41
Here's how to diagnose a blown/damaged woofer:
1. Some sound, but lots of rubbing scraping is heard. Voice coil was burned or charred... Can hear scratching/rubbing sounds, when you manually pump the cone, with no power to sub. You may even be able to smell something like burnt plastic or wire insulation. Too much power, will give this result.
2. No sound ... separated voice coil wire or tinsel lead pulled away from VC. Mechanical failure, as too much input power, excess bass boost or Xmax exceeded due to wrong enclosure specs.
3. Buzzing or rattling sounds, (while sub is playing at moderate to loud SPL)... Loose dust cap, spider, VC separated from cone or surround is separating from cone. This is usually caused by fatigue, aging woofer or poor assembly at factory. User repairs are often possible here. A little Super Glue or contact cement, will do the trick here.
4. Seized cone, some sound, but very poor bass output, the cone will not move manually or with power applied... In this case, the VC has jumped the gap, and is locked into a frozen position, outside the gap. You may try manually re-inserting the cone/VC, back into the magnetic gap. This is caused by excess bass boost, wrong box specs and over excursion (Xmax exceeded) When this happens, you may have to repair or replace the sub, as the VC may have been damaged and scrapes the pole piece.
Swez
If it ain't broke, you're not trying hard enough
snipe523 on 08/27/2004 11:43:00
Definately try another box to see what happens. Could possibly be the weave coming loose from the honeycomb part of the cone. I think I heard of one or two other people having this happen. It's one of those freak things that next to no one has happen. The weave is actually just like a covering for the honeycomb part and if it comes loose at all could be flapping slightly at higher voumes causing the "rattle" sound. Just a question though. Did you buy this speaker used? As far as I knew all eD speakers come with their 3 year warranty. So if you bought it new you should still be under warranty as those subs haven't been around for more than a year.
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