why is my amp turning 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=113117
Printed Date: May 09, 2025 at 11:44 AM
Topic: why is my amp turning off?
Posted By: cameron103
Subject: why is my amp turning off?
Date Posted: April 13, 2009 at 7:50 PM
My car is a 1995 Honda Civic. I'm running a pioneer flip up screen, and 4 Alpine Type S 5.25" speakers. In the trunk I have an Alpine v12 mrv-1505 amp pushing 2 Alpine Type R's in a sealed box. My subs will hit on any song on any cd, until I take out the cd to put in a different one or turn the car off and back on. The light on the amp stays green as if everythings okay. If I change the cd and want the subs to start hitting again, the only way I've found to get the amp to turn back on is to take out the 80 watt fuse and put it back in. Why is this? I've had several combinations of subs and amps in my trunk and not had this happen. Also, I can hook another amp up to my subs and it works just fine. Do I need to adjust the settings on my amp a certain way? Or is the amp no good?
Replies:
Posted By: djrankin004
Date Posted: April 13, 2009 at 8:40 PM
how do you have the subs wired? dual 2 or 4 ohm voice coils? how high is your gain set?
Posted By: haemphyst
Date Posted: April 13, 2009 at 10:02 PM
Besides just the R/R of the 80 amp fuse, what else have you tried? What voltages have you read at the remote and the battery terminals on the amplifier? How about your gains? ABOUT where are are they? What woofers? Voice coils and impedance, or better yet, EXACT model numbers.
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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."
Posted By: cameron103
Date Posted: April 14, 2009 at 7:06 PM
The amp is an Alpine mrv-1505. The subs are 2 12" Alpine Type R's, 4 ohm, dvc, 1000w max, 500w rms. I have each sub wired at 4 ohms to the respective speaker terminals, I have a jumper wire running from one terminal to the other, and wires running to the other terminal from the amp. I'm running it bridged. All the gains on the amp were set to high.
Posted By: djrankin004
Date Posted: April 14, 2009 at 11:35 PM
cameron103 wrote:
All the gains on the amp were set to high.
By this do you mean that the gain on your amp is....all the way up? bass boost is all the way up?
Posted By: haemphyst
Date Posted: April 15, 2009 at 11:06 AM
cameron103 wrote:
The amp is an Alpine mrv-1505. The subs are 2 12" Alpine Type R's, 4 ohm, dvc, 1000w max, 500w rms. I have each sub wired at 4 ohms to the respective speaker terminals, I have a jumper wire running from one terminal to the other, and wires running to the other terminal from the amp. I'm running it bridged. All the gains on the amp were set to high.
There is your problem... You can't "wire each woofer at 4 ohms". 2-ohms (parallel) or 8-ohms (series). Those are your choices. What you are describing to me sounds like you are on the 2-ohm route.
Two, DVC 4-ohm woofers can ONLY be wired as 1 (where I think you are), 4 and 16 ohms, presenting to a bridged amplifer an effective load of .5 (where I think you are...), 2, and 8 ohms. I bet you are running .5 ohms per channel. That's my guess. Rewire your woofers. Oh, and set your gains CORRECTLY! NEVER turn them all the way 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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