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Old 04-06-2009, 08:48 PM   #1
IridiumCore
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Help!! speakers keep blowing

I just installed my amp.

I got a Rockford Fosgate P300-1 300 Watt Mono Amplifier. I don't want it too loud and its not for show I just like bass in everything.

Everytime I wire two 12" subs to it they blow no matter how low my volume is. I did notice a considerable amount of noise from the car like the motor.

What can I do to stop blowing subs.
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Old 04-07-2009, 07:08 AM   #2
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How many times have you blown subs? Once? Twice? How are you wiring them? What subs are you using? Sealed box, ported box, free air? Have you made sure your ground is solid and short?
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Old 04-07-2009, 07:34 AM   #3
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Quote:
Originally Posted by visualpoet View Post
How many times have you blown subs? Once? Twice? How are you wiring them? What subs are you using? Sealed box, ported box, free air? Have you made sure your ground is solid and short?
I opened fuse box under the hood attached the wire to the positive side and ran that to the trunk for the power. The ground is attached to one the screws holding the speaker covers on. Using cheap subs since they keep blowing. The think the most expensive I've gotten was JL's from the pawn shop. Its a ported box.

When you say the ground is short do you mean the actual length. I thinks is about a foot of wire attached to the speaker covers located in the rear window.

I'm about to get a noise reducer because there is a lot of engine noise.

I've blown about six sets. The last set was a walmart brand. the amp is 300 watts and most of the sub's I've gotten have been 4 or better.
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Old 04-07-2009, 07:44 AM   #4
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there is something wrong with the wiring or the amp. If your getting engine noise, check your grounds all over. and you may want to use a self-tapping screw and make your own ground somewhere. and scrape of sand the paint off of the surrounding area for the ground to help.
if all else fails, go have the amp tested somewhere.
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Old 04-07-2009, 07:53 AM   #5
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Something is definitely wrong in the amp or wiring. Are you wiring the subs in stereo or bridged? Can you take some pics of the setup? We might be able to see something you wouldn't think to tell us.
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Old 04-07-2009, 10:09 AM   #6
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Quote:
Originally Posted by visualpoet View Post
Something is definitely wrong in the amp or wiring. Are you wiring the subs in stereo or bridged? Can you take some pics of the setup? We might be able to see something you wouldn't think to tell us.
Yeah on lunch I'll run out and get some pics. A buddy of mine told me that since I am using electrical tape I may be having issues.

I'll take pics of the wiring behind the head unit and in the trunk.
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Old 04-07-2009, 11:50 AM   #7
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Adding Pics Shortly.

I just notice that behind the head unit I have two purple wires.
One is plain purple and the other has a black stripe.

Well the purple is connected to the purple/black wire. I should switch that huh.
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Old 04-07-2009, 11:57 AM   #8
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Here are the pics

If you can't make them out clicking on the pic will open the photobucket alblum.

Behind the head unit





Under the hood


Ground


To the Amp
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Old 04-07-2009, 02:43 PM   #9
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Well, I'd keep that indash wiring to my self, but it's not the problem, although switching the purple wire might make things sound better, you won't know until you try. I'd find a place to connect my ground to make it shorter. The shorter the better. Mine is less than 12 inches. How are the subs wired to the amp? Are you sure the subs are blowing and it's not the amp dropping into protection mode? Have you tried wiring just one up?
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Old 04-07-2009, 03:31 PM   #10
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Originally Posted by visualpoet View Post
Well, I'd keep that indash wiring to my self, but it's not the problem, although switching the purple wire might make things sound better, you won't know until you try. I'd find a place to connect my ground to make it shorter. The shorter the better. Mine is less than 12 inches. How are the subs wired to the amp? Are you sure the subs are blowing and it's not the amp dropping into protection mode? Have you tried wiring just one up?
LOL, Yeah I prolly should huh. I know its ugly.
Yeah it does sound better. Yeah it's not going in to protect mode. I tried the speakers on a different source and got nothing. But they go from the amp to the box. The box is wired internally to the speakers. I'm about to put some hinges and flap to get insidethe box easier.
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Old 04-07-2009, 04:45 PM   #11
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Also (this wont stop the speakers from blowing, but you said you are hearing noise from the engine) make sure your RCA's are ran down the opposite side of the car than the power wires. When it comes to the speakers.....hmmmmm....I would try another amp. Hop on craigslist and see what the have for cheap. Something isn't right for sure....just not able to make an exact opinion without actually being there and physically looking at your set up.
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Old 04-08-2009, 06:43 AM   #12
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Also (this wont stop the speakers from blowing, but you said you are hearing noise from the engine) make sure your RCA's are ran down the opposite side of the car than the power wires. When it comes to the speakers.....hmmmmm....I would try another amp. Hop on craigslist and see what the have for cheap. Something isn't right for sure....just not able to make an exact opinion without actually being there and physically looking at your set up.
Thanks for all your help gentlemen. I think I'll hold off on the system for know at least until I can get some one to look it over. I just hate having no substantial bass when I'm on the road.
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Old 04-08-2009, 12:56 PM   #13
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did you try turning thet gain down on the amp? i went through a few cars with the same issue... turns out my dumb ass was WAAAAAAAAY overpowering the subs and fryin the voice coils
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Old 04-08-2009, 02:52 PM   #14
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did you try turning thet gain down on the amp? i went through a few cars with the same issue... turns out my dumb ass was WAAAAAAAAY overpowering the subs and fryin the voice coils
Yo I haven't touched it. That would make alot of since. I'll give it a shot. My novice ass figured if the amp was 300 watts and speaker were 400 it they could handle it.
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Old 04-10-2009, 08:46 PM   #15
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My gain is a bit under halfway on my P3001.
I have it powering a JLW3V2.

Like he said^^^ try the gain.
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Old 04-10-2009, 09:52 PM   #16
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Quote:
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just not able to make an exact opinion without actually being there and physically looking at your set up.
werd up....i'd luv to help out a fellow cb7tuner but i have to be there
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Old 04-11-2009, 02:36 AM   #17
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Im sorry but if I saw a car come into my shop like that I would refuse to work on it. Get a professional to fix your install before it causes damage. Taking power from the fuse box like that will starve the rest of your electrical system. Run the power wire straight to the battery. You also need to ground the amp to bare metal not just any bolt that is easy to get at. sand down a spot of bare metal and use 3 sheet metal screws to screw the connector to the bare metal. Then use primer paint in a spray can to spray the bare metal so it wont rust. i will try to take pictures of my install so you know what I mean.

Also Run your gain on the amp as low as possible. The higher the gain the more distortion you will reproduce and the more subs you will blow.

Most importantly you have to remember that a speaker is an electric motor. its needs to be broken in before pushed hard or guaranteed you WILL blow it up. Run the sub at a low volume for approximately 30-40 hours. then try a higher volume.

These are the three most common mistakes I see with self install jobs on a daily basis so please dont take offence to anything I am saying i just want to help you do this properly.

Dont let these problems deter from you from running a stereo just do it right the first time and you wont have issues to deal with in the future.
I have been doing installs and selling car audio for 3 years and I have never once blown up a sub in my own car and I have run a ton of sub combinations. I am running an 1100 watt rms sub amp right now in my car on 2 300 watt rms subwoofers and i push them hard every day and never had an issue. you just have to do it right and listen for distortion. if it doesnt sound right or clean anymore its too loud or being pushed too hard.
Good luck!
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Old 04-11-2009, 10:26 AM   #18
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Really?
How can your starve the rest of your electrical system when all of it is coming from the same source? The worse problem you should have is blowing fuses left and right.

Gain doesn't destroy subs, clipping does.

We actually just finished a thread not to long ago about how subs do NOT need break in time. Do you know what happens to a speaker when it is "breaking in"

I'm not trying to question your intelligence but I've seen many statements like this.
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Old 04-11-2009, 11:35 AM   #19
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Quote:
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Gain doesn't destroy subs, clipping does.
True story.
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Old 04-11-2009, 11:47 AM   #20
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Whats frequency is your crossover set to, and do you have a inline fuse between your battery and your amp?
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