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amp trouble, or maybe sub trouble

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=96943
Printed Date: November 28, 2021 at 9:07 PM


Topic: amp trouble, or maybe sub trouble

Posted By: lanceam24
Subject: amp trouble, or maybe sub trouble
Date Posted: September 07, 2007 at 1:21 AM

i was listening to my system earlier tonite, a rockford 12 p212s4 runnin off a sony xplod 1200 watt amp. i was listening to it pretty loud while driving home. about 5-10 min. into the ride, i heard my bass get lower and lower until it finally shut off all together. the blue display light is still shining on my sub, and the warning light has not come on, so i guess it hasnt overheated (it was kinda hot tho). i will take my sub out tomorrow and c if maybe this was the cause. what is everyones thoughts on y this would b happening



Replies:

Posted By: eurobink
Date Posted: September 07, 2007 at 1:36 AM

u probably did overheat the amp..just because protection light isnt on doesnt mean the amp is fine.. that protection typically guards against miswiring.. you probably killed your amp...

it fought to the very end... till it could fight no more.. you are an amp killer..





Posted By: lanceam24
Date Posted: September 07, 2007 at 1:52 PM
so just like that, with my volume no louder than about 21, i can blow an amp... good thing i got the protection plan from best buy




Posted By: DYohn
Date Posted: September 07, 2007 at 2:02 PM
They don't call them Explode for nothing.  posted_image

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Posted By: lanceam24
Date Posted: September 07, 2007 at 2:13 PM

so i shoud get another amp then. but not just yet, they r gonna fix this one first





Posted By: lanceam24
Date Posted: September 07, 2007 at 2:32 PM
wut do yall think would b a good amp for around $200 for a rockford p212s4?




Posted By: eurobink
Date Posted: September 07, 2007 at 11:44 PM

DYohn] wrote:

hey don't call them Explode for nothing.  posted_image

that was a good one...

it's very important to note how you wired your subs.. post the details and we will help you out...





Posted By: lanceam24
Date Posted: September 08, 2007 at 9:30 AM
really, i didnt do anything. i let best buy install the whole thing




Posted By: supradude
Date Posted: September 08, 2007 at 9:51 AM
lanceam24 wrote:

really, i didnt do anything. i let best buy install the whole thing
This might be the real problem. Let us know how they have the subs wired.

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Posted By: s10-2-loud
Date Posted: September 08, 2007 at 9:53 AM
hey when i play my radio past 45 for about 20 minutes my amp cuts off and i have to kill the power to it and then cut it bac on and it will do the same thing again tell me what you think it is and hpw to fix it

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s10 way to loud




Posted By: DYohn
Date Posted: September 08, 2007 at 10:11 AM
Both lanceam24 and S-10: I suspect your gains are/were too high.

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Posted By: lanceam24
Date Posted: September 08, 2007 at 9:14 PM
if u dont mind DYohn, could u explain what this means, so i can maybe prevent this in the future? im new to the car audio world, but im tryin to learn about it. tomorrow morning i will get out there and look at how they wired it and describe it to the best of my knowledge




Posted By: DYohn
Date Posted: September 09, 2007 at 4:11 PM
The input gain on an amplifier needs to be set so it will function correctly with the output from your head unit.  If it is set too high it will allow the amplifier to clip, which forces more voltage to pass through to the speaker without a corresponding increase in musical information.  If the amplifier is capable of putting out more voltage than the speaker can handle, it can fry the speaker's voice coil, and sound like crap doing so, and/or in the case of an amplifier with poor build quality it can destroy the output transistors through over current.  The same sort of thing can happen with too low an impedance load on an amplifier if the amplifier is not well-constructed and/or lacks a good protection circuit.  Sony Xplode amplifiers are not known for very high build quality.

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Posted By: lanceam24
Date Posted: September 09, 2007 at 5:38 PM

o ok thanx for the explanitation. so it turns out i blew my sub. i took my sub out of my trunk and hooked my friends kicker up to it for a few min. and the amp was operating just fine. i took the plexiglass cover off of my bandbass box and the sub locked up. hard as a rock. the guy at best buy said to get a bigger sub because this one was 200 rms and 400 peak. and the amp is 500 rms and 1200 peak. i got the warrenty from online so imma get another one.  tomorrow i'll call and c if maybe they will just let me pay the difference to get a alpine type r. but before i do nething, i want to know what everyone thinks






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