ok, so, i have just purchased a new Memphis 16-pr1.1000 amp, and am using it to power a pioneer premier 12'' ts3002spl, in a sealed box. when i listen to my system, sometimes my sub will make this god awful noise, like thunder, not bass or music, but a horrid deep shaking/rattling noise. Then my amp will go into protect mode if i let it continue, only if my volume on the HU is past like 12, (it goes up to 50, so its not that loud). I don't get it, it will be fine for like the first few minutes or so then it will make this noise and i am just in fear that i will damage my amp, and have to shut it off. I have the amp and sub wired for 1 ohm, my ground is pretty solid, and am currently using 4 gauge power/ground wire. When i had the same wiring setup, just with a different cheaper, less powerful amp, there was no problem at all. I think it might be my RCA cables, they kind of cheap and might be designed just for less power. MY remote turn on and RCA cables are on the opposite side of the vehicle as the power wire. ANYBODY, PLEASE, SUGGESTIONS ?
Replies (7)
jamesp on 03/16/2007 12:29:51
I cant find the speaker specs but assume it is a DVC 2 OHM wired in parrallel to 1 OHM???so..if you had this woofer operating at 1 OHM on a different amp with no problems then look for tiny copper strands that could be shorting at the power and ground connection at the amp. Look at the speaker terminals for same. If you have been in the box you may check if it uses spade type terminals if it could be shorting there.
Try reconfiguring the sub to 2 OHMs and check it that way. Your amp is 1 OHM stable...but 1 stray strand of copper could cause you a lot of trouble.
413audio on 03/16/2007 12:58:18
good call, i will definitely give that a go... (but i didn't think i had the option of a 2 ohm load on the sub, or do i?)... thanks alot for the input
MrBrownstone on 03/16/2007 13:14:24
what are your settings for gain controls, bass boost, and the same on the head unit?
cplkittle on 03/16/2007 14:23:07
I have seen that a dozen or so times. Normally it starts with a bad ground, then the amp grounds itself through the RCA cables back through the stereo.
Turn the stereo on and when it starts to rumble, unplug the RCA cables from the amp and see if that stops it.
If so, check the amp ground (It should be the same size as the power wire, and grounded to bare metal less than 3' from the amplifier).
If it continues, run a new RCA. Just temporary at first to try to isolate the problem. If the problem is still there, the RCA output may be bad on the radio. What kind of HU is it? If it is a Pioneer, you may need to enhance the ground on the RCA outs.
413audio on 03/16/2007 21:05:58
well its actually a Sony gt110 explode HU, (not the best choice i know), yea my ground wire and power wire are both 4gauge... my gain on the amp is about 1/4 the way up, and on my HU the SUB setting is at half. my ground has to be about 10-12'' , but right now i am in the process of switching the old RCA cables to better Lightning Audio RCA cables, neatening the ground and other connections, etc.,they should be finished by tonight, hopefully this should solve the problem, ill let you guys know how it turns out... thanks for the input everyone
cplkittle on 03/16/2007 21:52:10
test the RCAs first before you go through the process of running them under the panels under the back seat etc...
413audio on 03/16/2007 22:49:15
yea, i had weak RCA's before, i tested the new ones and it seems to be working properly, so hyped!, thanks for the input
Replies (7)
jamesp on 03/16/2007 12:29:51
I cant find the speaker specs but assume it is a DVC 2 OHM wired in parrallel to 1 OHM???so..if you had this woofer operating at 1 OHM on a different amp with no problems then look for tiny copper strands that could be shorting at the power and ground connection at the amp. Look at the speaker terminals for same. If you have been in the box you may check if it uses spade type terminals if it could be shorting there.
Try reconfiguring the sub to 2 OHMs and check it that way. Your amp is 1 OHM stable...but 1 stray strand of copper could cause you a lot of trouble.
413audio on 03/16/2007 12:58:18
good call, i will definitely give that a go... (but i didn't think i had the option of a 2 ohm load on the sub, or do i?)... thanks alot for the input
MrBrownstone on 03/16/2007 13:14:24
what are your settings for gain controls, bass boost, and the same on the head unit?
cplkittle on 03/16/2007 14:23:07
I have seen that a dozen or so times. Normally it starts with a bad ground, then the amp grounds itself through the RCA cables back through the stereo.
Turn the stereo on and when it starts to rumble, unplug the RCA cables from the amp and see if that stops it.
If so, check the amp ground (It should be the same size as the power wire, and grounded to bare metal less than 3' from the amplifier).
If it continues, run a new RCA. Just temporary at first to try to isolate the problem. If the problem is still there, the RCA output may be bad on the radio. What kind of HU is it? If it is a Pioneer, you may need to enhance the ground on the RCA outs.
413audio on 03/16/2007 21:05:58
well its actually a Sony gt110 explode HU, (not the best choice i know), yea my ground wire and power wire are both 4gauge... my gain on the amp is about 1/4 the way up, and on my HU the SUB setting is at half. my ground has to be about 10-12'' , but right now i am in the process of switching the old RCA cables to better Lightning Audio RCA cables, neatening the ground and other connections, etc.,they should be finished by tonight, hopefully this should solve the problem, ill let you guys know how it turns out... thanks for the input everyone
cplkittle on 03/16/2007 21:52:10
test the RCAs first before you go through the process of running them under the panels under the back seat etc...
413audio on 03/16/2007 22:49:15
yea, i had weak RCA's before, i tested the new ones and it seems to be working properly, so hyped!, thanks for the input
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