subs shutting off
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=118746
Printed Date: May 16, 2024 at 12:23 AM
Topic: subs shutting off
Posted By: beatin
Subject: subs shutting off
Date Posted: December 22, 2009 at 5:18 PM
my partna is having troubles in paradise...he has a 2008 chevy impala with the factory radio installed runnin two 12" kicker L7 4ohm load. the problem is when he turns the system up the subs shut down, the other speakers are still playing. we just finished looking at the wiring to the subs, but i didnt see n e thing out of the ordinary. plus his lights are diming really bad. He has confused me with this one so im looking for some help for him.
Set-up:
Factory h/u
rockford interface for subs
kicker 1500.1 mono amp (turned 1/4 up)
(2) 12" kicker L7
optima yellow top bat
20 farad rockford cap
Replies:
Posted By: DYohn
Date Posted: December 22, 2009 at 5:21 PM
One of several things, but most likely one or both of these: 1) amp gain is too high, 2) your alternator cannot keep up with the load and system voltage is dropping too low. Read the "How to set your gains" post in the Hot Topics forum, and measure your voltage as I bet you need to upgrade the Big 3 and probably invest in a new high output alternator as well. ------------- Support the12volt.com
Posted By: i am an idiot
Date Posted: December 22, 2009 at 5:22 PM
Did you use a meter to make sure the woofers are wired at 4 ohms?
Posted By: beatin
Date Posted: December 22, 2009 at 5:57 PM
the speakers are rated @750 rms per sub and the amp is a mono 1500.1 when i said 1/4 way up meaning that the amp is bearly turned up, but i will have him check the the alt output...
we use the wiring diagram per this site for the wiring of the subs also...
Posted By: beatin
Date Posted: December 22, 2009 at 6:30 PM
how do you check the ohms that ur running using a voltage meter
Posted By: oldspark
Date Posted: December 22, 2009 at 6:40 PM
Add a current meter R = v/i
Most use multimeters and set the resistance (Ohms) range into UNPOWERED impedences (load, speakers etc).
Posted By: i am an idiot
Date Posted: December 22, 2009 at 6:54 PM
With the amp turned off, you can have the speakers connected to the amp. Set the meter to the Ohms selection. Touch one meter lead to one speaker terminal. Touch the other lead to the other speaker terminal. The woofers need to be as still as you can possibly have them to get an accurate reading. No other speakers in the car playing. No woofers playing in the next vehicle. The amp must be off, not volume turned down, the amp must be powered off.
Posted By: zerepdivad
Date Posted: December 25, 2009 at 2:43 AM
I'm gonna vote that they're dual 4 ohm subs wired to 1 ohm.
-------------
A DMM is a beautiful thing.
MECP Advanced Installer Certified.
Posted By: mamartinez1213
Date Posted: December 27, 2009 at 8:33 PM
i think its because your factory radio is not enough power for your amp.and the one speaker output is sucking all the juice from that one channel.,
Posted By: i am an idiot
Date Posted: December 27, 2009 at 8:52 PM
Wow
Posted By: zerepdivad
Date Posted: December 27, 2009 at 9:05 PM
^ i'm going to have to second that. I'll just call it job security.
-------------
A DMM is a beautiful thing.
MECP Advanced Installer Certified.
Posted By: i am an idiot
Date Posted: December 27, 2009 at 9:24 PM
Kind of loses it's impact when it starts a new page.
Posted By: DYohn
Date Posted: December 27, 2009 at 10:42 PM
mamartinez1213 wrote:
i think its because your factory radio is not enough power for your amp.and the one speaker output is sucking all the juice from that one channel.,
Yea man, I hate it when I get a vampire speaker like that, sucking all the juice from the factory radio and starving all the others of musical goodness. When you get one of those the only thing you can do is drive a wooden stake right through it, and hope it is not a Sony speaker because those b*st*rds can come back from the dead. What you suggest is impossible, by the way. ------------- Support the12volt.com
Posted By: haemphyst
Date Posted: December 28, 2009 at 3:36 AM
mamartinez1213 wrote:
i think its because your factory radio is not enough power for your amp.and the one speaker output is sucking all the juice from that one channel.,
Gee, I hope me be as smart as you do when I grow up!  ------------- It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
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