what will cause subs to stand up?
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=96184
Printed Date: July 04, 2025 at 9:12 PM
Topic: what will cause subs to stand up?
Posted By: supraman74
Subject: what will cause subs to stand up?
Date Posted: August 05, 2007 at 7:25 PM
What could cause my subs to (stand up) when I turn on my system?? They expand when I power up my system and they just stay there?
Replies:
Posted By: Fosgate3
Date Posted: August 05, 2007 at 7:46 PM
I had this happen once with a bad rockford amp. the output was putting out something like 14 or 15volts or so, if not more. the subs would hit xmax (stand up as you put it). it would be a fault with your amp, I'd guess. Can you change amps?
Posted By: supraman74
Date Posted: August 05, 2007 at 7:51 PM
Its weird cause it did it, I checked my amp connections and all looked good, I turned it back on and its was normal again. Its fine now but I was wondering if I had a loose connection or something I only have one amp so I cant change it out.
Posted By: i am an idiot
Date Posted: August 05, 2007 at 8:03 PM
If you do have a loose connection it is inside your amplifier. There is nothing outside the amp that could cause this condition. If this happens again it could damage your woofer. Proper fusing of your amp power wire could possibly prevent woofer damage if it were to happen again.
Posted By: supraman74
Date Posted: August 05, 2007 at 9:06 PM
My amp wire is fused.
Posted By: i am an idiot
Date Posted: August 05, 2007 at 9:20 PM
What kind of an amp is it? How many subs, what is the impedance of your sub, if 2 subs are they bridged? Single or dual voice coil? Does the amp itself have fuses on it, if so how many and what size are they?
Posted By: supraman74
Date Posted: August 05, 2007 at 9:40 PM
Posted By: supraman74
Date Posted: August 05, 2007 at 9:43 PM
My subs are bridged, my amp has two fuses, cant remember the sizes
Posted By: cutlass013
Date Posted: August 06, 2007 at 2:19 AM
Posted By: Fosgate3
Date Posted: August 06, 2007 at 5:16 AM
take a voltmeter, put it on DC setting and see what you get when you put the positive and negative probes to the output of the amp. I'm assuming you are bridging the amp, so you would probe the bridge + and -. I dont know if this will or wont lead to a "solution" but it will give some interesting info about the situation. While you are at, you can check the ohmload of your subs to see what load you really have going to the amp.
Posted By: aznboi3644
Date Posted: August 06, 2007 at 4:42 PM
if the subs move out and stay there than the amp is putting out DC current...which is a really bad thing
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