2nd blown sub in 4 day
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=50429
Printed Date: July 06, 2025 at 8:08 AM
Topic: 2nd blown sub in 4 day
Posted By: pittsburry
Subject: 2nd blown sub in 4 day
Date Posted: February 19, 2005 at 1:55 AM
hi this is my first post here, english is my second language so be lenient, :) i have a serious problem i explain, i buy a 200 watt amplifier 2 channel with a 350 watt rms 12 inch subwoofer, i install it in my car all go nice and smooth but 2 day later the sub start to rattle and the amp goes on protect ,try to stop and start her back but the amp just make a pop in my sub and go on protect again .i try a speaker on my amp and it play great i ve got my sub exchange for an other one identical. same thing produce again 2 day after i install it what is the prob the amp???? or the sub???? dont know what to do helppp??? I do the wiring myself and i double chek it ( its not my first install )
Replies:
Posted By: wheelerdr
Date Posted: February 19, 2005 at 4:29 AM
what brand amp and sub, what are the setting on the amp and how is the sub wired to the amp. -------------
Posted By: pittsburry
Date Posted: February 19, 2005 at 1:18 PM
its a cheap brand (legacy) the amp have an internal crossover tha is set on low with a bass boost and the volume of the amp is about half the way to the max and the sub is wired in bridge mode to the amp
Posted By: DYohn
Date Posted: February 19, 2005 at 1:29 PM
Your amp is the problem. It is cheap and clipping, which will destroy any sub, and add the fact that you have not set it up correctly (the gain on an amp is NOT a volume control) and you end up with "2 blown subs in 4 days." If you must use that amp, set the gain properly. Do a search on this forum for many threads with instructions. But ultimately I suggest you spend a little more and get a real amplifier. Legacy is, IMO, only worthy for use as a doorstop. ------------- Support the12volt.com
Posted By: Alpine Guy
Date Posted: February 19, 2005 at 1:35 PM
you can also use them amps as portable heaters  ------------- 2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.
Posted By: pittsburry
Date Posted: February 19, 2005 at 1:38 PM
thanks for the solution i now have a new door stop and a portable heater  ill try to get it back to the store for some better stock
Posted By: supradude
Date Posted: February 19, 2005 at 2:06 PM
Set the gains right or you will end up blowing more subs, even with a good amp. You can try to sell it on fleabay, somebody out there thinks legacy is good. They can hook it to audiobahn subs.
-------------
'85 Toy
Posted By: bbattleson
Date Posted: February 19, 2005 at 6:19 PM
Maybe the amp sucks but how did you wire it? Is it a dual or single VC sub? bridge a dual VC the wrong way and it'll send that amp protecting itself. What ohm sub is it? Drop that legacy at 2ohms and I guarantee it's clipping for sure. Even though it might be rated at that. A 4ohm speaker will drop lower than 2ohm's while moving (if bridged of course), therefore making some of the lesser quality amps go into protection. Find out the details before you junk it. Maybe some people cant or dont want to pay for the good stuff. You can make the cheap stuff work if your on a budget. Just wont sound as good.
Posted By: pittsburry
Date Posted: February 20, 2005 at 12:29 AM
the sub is a single vc 4ohm and the amp on bridge mode push 4 or 8 ohm (that what said the manual that comes with it) anyway ill trow it back to the store and get something else
Posted By: bbattleson
Date Posted: February 20, 2005 at 7:31 AM
It's too low of an ohm load for that amp. You would probable be fine if you bridged an 8ohm sub but not a 4ohm. Try running it in stereo and see if you still blow the sub.
Posted By: pittsburry
Date Posted: February 26, 2005 at 12:39 PM
i get a new sub and try to set the gain correctly and everything seems to be more clear the sound is not loud as before but better quality i dont think it will blown again i plug it in bridge mode in stereo a svc 4ohm sub 350 watt rms and also get a new hu a keewood kdc722 men all the difference is there all my speaker seems to play loud and clear
|