amp problem
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=20064
Printed Date: August 28, 2025 at 8:39 PM
Topic: amp problem
Posted By: gregkgkemp
Subject: amp problem
Date Posted: October 13, 2003 at 10:02 PM
My big monoblock amp keeps cutting out (protect mode) as soon as the radio turns on. However, if i disconnect the sub the amp does not go into protect. Am i drawing too much power? I'm trying to figure out the draw of my amps. One has 3 25 amp fuses, and the other has 4 40 amp fuses. how much draw is that? do i need a bigger alternator and battery?? if so, what size would be sufficient? I have a 1998 chevy pickup.
Replies:
Posted By: Sound World
Date Posted: October 13, 2003 at 10:13 PM
What is the impedence of the sub - 4ohm, 8 ohm, dual 2ohm, dual 4 ohm? What size power wire?
Posted By: bberman1
Date Posted: October 13, 2003 at 10:29 PM
Can you list your setup(model #'s)?
Posted By: intensem1rider
Date Posted: October 13, 2003 at 10:37 PM
sounds like a case of the blown sub......or messed up sub wireing. Pray its the wireing!
but please tell us models of the amps, and models of the subs, and what impedence the subs voice coils are, then we can help you out.
Posted By: italnpimp59
Date Posted: October 13, 2003 at 11:56 PM
u probably got the subs at too low of an ohm load for the amp to handle so thats why it cuts out, but just like everyone else said...we need to know what kinda subs and amp you got and whats the impedeance on the voice coils, and how did u have them wired up
-------------
Posted By: Ketel22
Date Posted: October 14, 2003 at 2:03 AM
learn quick that its the sub, me and my friend were just starting into car audio and ended up replacing everything but the sub before we figured out it was blown. ended up spending over $300 when i have subs sitting in my room and garage.
-------------
Quad L Handyman services
Posted By: wvsquirrel
Date Posted: October 14, 2003 at 3:41 AM
I have to agree that it appears the problem is with either the sub or the way it is wired to the amp. Too low of an impodence can cause any amp to go into protect mode, even if it didn't do it before. Amps can be touchy about that. Initially some will work fine with a lower than stable ohm load, then one day it just stops working. Please list your make and model number for the amp and sub, the number of subs you are useing, and how you currently have them wired. ------------- Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com
Posted By: gregkgkemp
Date Posted: October 14, 2003 at 2:37 PM
amp: crunch v-1800 monoblock sub: 2 ohm dvc kicker s10l7. wired in parallel.
Posted By: wvsquirrel
Date Posted: October 15, 2003 at 12:11 AM
More than likely you blew your sub. The S10L7 is 600RMS 1200Peak. The Crunch V-1800 is 1200x1@1ohm. Assuming that amp is producing anywhere near its "rated" output, then you threw the subs Peak rating at it. Major no-no. You should have thrown somewhere between 600-900 watts max to that sub, not 1200 watts. ------------- Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com
Posted By: gregkgkemp
Date Posted: October 15, 2003 at 8:38 AM
how can i test and see if it is blown?
Posted By: wvsquirrel
Date Posted: October 15, 2003 at 8:45 AM
Unfortunately the only way I know of is audibly with either hooking the sub up to another amp, or hooking a different sub up to the current amp.
I believe you can turn on your current setup and test the connection with a DMM set to OHMS. Test the connections at the amp and at each set of terminals on the sub. I'm not sure if it will change if the sub is blown or not, perhapse one of the experts could further advise you on this one... ------------- Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com
Posted By: Ketel22
Date Posted: October 15, 2003 at 11:12 AM
to check if the sub is blown simply get out your DMM and use the resistance setting to check that the sub reads the propper resistance, ie. 2ohm for a dvc 4ohm in parallel, 8ohm for a dvc 4ohm in series, 4ohm for svc 4ohm etc.
-------------
Quad L Handyman services
Posted By: gregkgkemp
Date Posted: October 15, 2003 at 1:29 PM
i'll try it and post an update. thanks
|