noise from subwoofer box

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jdubicki

Copper - Posts: 58

Joined: April 11, 2008

Location: Texas, United States

Posted: July 23, 2009 at 2:10 PM / IP Logged

Hey Guys,

I Have a question, please don't laugh. I am just trying to get all the info before I make my next move. With my trunk open and my stereo on the right sub makes a vibrating buzz every time it hits. It is not very loud, and you can't even hear it when your in the car. I have some theories as to why this may be happening. Kepp in mind that as far as I know the left side is fine. I'm thinking the enclosure could have air leaking into it or the sub is seated perfectly against the box. I have tightened screws as tight as I can get them. The surronds on both sub are cracking all around the sub where it attaches to the basket. I can't tell if it is actually damaged, or just wear and tear. I know I will have to repair the surrounds eventually (wife won't let me get new subs). I'm also pretty sure that the voice coil and the guts are fine as well. Besides that the whole system plays just fine. I was also thinking that it could be where my crossover is set. I have an Alpine MRP-M500 set between the 75 and 100 marks. I'm guessing this is about 80 to 85 HZ. Let me know what you guys think. Am I making this out to be more than it is, or do I have a problem to deal with. Thanks in advance.

2005 Honda Accord DX

DYohn

Moderator - Posts: 10,741

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Joined: April 22, 2003

Location: Arizona, United States

Posted: July 23, 2009 at 3:05 PM / IP Logged

Assuming it is not simply something rattling in your trunk, the sound is either the speaker itself has come loose from the enclosure, or the voice coil is seperating and the sub will soon die. What do you mean by "the surrounds are cracking"?

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jdubicki

Copper - Posts: 58

Joined: April 11, 2008

Location: Texas, United States

Posted: July 23, 2009 at 3:15 PM / IP Logged

I means they are begining to show signs of wear and are separating. It's not bad though. I will try to photograph it tomorrow. I guess the idea of the coil makes sense as well. Although I am NOT abusing the equipment (ie. pushing it to the limit with the volume and the gains) I am running a 500 watt amp at 2 ohm to a pair of 200 watt RMS/400 watt max subwoofers.

2005 Honda Accord DX

DYohn

Moderator - Posts: 10,741

Joined: April 22, 2003

Location: Arizona, United States

Posted: July 23, 2009 at 3:21 PM / IP Logged

If the surrounds are "separating" they need to be repaired.

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jdubicki

Copper - Posts: 58

Joined: April 11, 2008

Location: Texas, United States

Posted: July 23, 2009 at 3:24 PM / IP Logged

I will repair them. What about my power to sub ratio. Am I doing more wrong than good??

2005 Honda Accord DX

DYohn

Moderator - Posts: 10,741

Joined: April 22, 2003

Location: Arizona, United States

Posted: July 23, 2009 at 3:31 PM / IP Logged

jdubicki wrote:

I will repair them. What about my power to sub ratio. Am I doing more wrong than good??

That amp could certainly blow those woofers. How did yu set your gain?

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jdubicki

Copper - Posts: 58

Joined: April 11, 2008

Location: Texas, United States

Posted: July 24, 2009 at 7:16 AM / IP Logged

Gain is set at a little above 0.5V. It's basically between that and 75% full power. I have a low voltage radio though so that should not matter. I am actually going to purchase a remote gain control because on some sources I could come down on the sub gain a hair or two. Here is the deal though, I used to have these hooked up to an MTX Thunder 895. That amp was giving them 320 watts at 12.5 volts. The alpine documentation says it pushes 500 watts at 14.4 volts. I know for a fact that my head unit is not putting out a 14.4 volt signal. This is why think it is either the surround or possible the box itself, but I'm not totaly writing off the coil.

2005 Honda Accord DX

DYohn

Moderator - Posts: 10,741

Joined: April 22, 2003

Location: Arizona, United States

Posted: July 24, 2009 at 12:10 PM / IP Logged

In other words you never set the gain properly. I bet your amp is clipping and that has damaged at least one of the voice coils. Please read the "How to set your gain" thread on the Hot Topics forum. You also state:

" I know for a fact that my head unit is not putting out a 14.4 volt signal. " to which I say, HUH? The operating voltage of an amplifier is the system voltage coming from your alternator and has nothing to do with the preamp voltage from your head unit.

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jdubicki

Copper - Posts: 58

Joined: April 11, 2008

Location: Texas, United States

Posted: July 24, 2009 at 12:18 PM / IP Logged

OK, point taken. What I was trying to get at was that I didn't think I was actually getting the full 500 watts out of the amp. I have read the sticky on how to set the gain. I have tried to be extremely careful as not to introduce distortion into the system. If I set the gain any lower I get no bass at all. I guess there really isn't much I can do now, if the colis are going to burn up theres not much I can do about it cause I can't replace the subs as of now. Let me ask you this. Am I going to cause damage to the amp if the coils do burn out??

2005 Honda Accord DX

icearrow6

Copper - Posts: 497

Joined: February 02, 2009

Location: California, United States

Posted: July 24, 2009 at 12:20 PM / IP Logged

jdubicki wrote:

... I know for a fact that my head unit is not putting out a 14.4 volt signal. .

Wow, i don't know any HU that can put out 14.4V rca. LOL

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