interference
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=29341
Printed Date: June 16, 2024 at 8:55 PM
Topic: interference
Posted By: bullard2003
Subject: interference
Date Posted: March 30, 2004 at 5:29 PM
OK, I just put in a 1400watt Audiobahn amp, and two 700w RMS audiobahn subs and a fosgate 1 farad cap. When I turn down the stereo all the way My subs are getting some sort of interference. Its not a whine with the RPM, just random bass beats. When I turn the volume to 1 or more it goes away. It sounds horrible when i temporatily turn it down to answer the phone or talk. I tried Scosche`s ground loop isolator but it didn`t do any thing. Any help?
Replies:
Posted By: DYohn
Date Posted: March 30, 2004 at 5:45 PM
Hmm. This could be a number of things, including a bad ground on the amp and gains set too high on the amp. It could also be bad RCA cables. I'd start by verifying the amp ground connection is solid and to bare metal, and then check the gain settings.
Posted By: bullard2003
Date Posted: March 31, 2004 at 2:06 PM
OK, another problem, last night driving to work my amp kept getting really hot, and went into protection mode a couple of times. This morning I had it hitting pretty hard for a while and it stayed cool. Whats up with that?
Posted By: forbidden
Date Posted: March 31, 2004 at 2:22 PM
Turn the gains down, this is what it sounds like to me, if you have a bass boost turned up, turn it down as well. Like Dyohn suggested, make sure you have a really good ground for that amp and are using the proper guage wire for both power and ground. An amp is designed to get hot but not too hot. When the heat cannot be dissipated properly the amp will go into thermal protection. Here is another thing to consider, in the evening and during the day your vehicle is usually much warmer on the inside than first thing in the morning, thus the level of heat to be removed from an already warm amp is even more of a problem in a warm trunk. ------------- Top Secret, I can tell you but then my wife will kill me.
Posted By: DYohn
Date Posted: March 31, 2004 at 2:28 PM
Also if it went into protection it could be the impedence load on the amp. How are the speakers wired and what it the total impedence load? What are the model numbers of the equipment you're running? And as we seem to constatly have to preach, set your gains PROPERLY and if you don't understnad what that means, do a search on the forum (since the instructions have been posted here hundreds of times) or ask!
Posted By: superstreet786
Date Posted: March 31, 2004 at 3:07 PM
most newer amps should never overheat... they have built in fans
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---- 1996 Chevy S10 ----
1 Lightning Audio S2.600.2 Amp
2 Lightning Audio 12" Subs
1 Lightning Audio 1 Farad Cap
Posted By: bullard2003
Date Posted: April 01, 2004 at 1:54 PM
I have an audiobahn A8002T amplifier with an intake, 2 audiobahn AW1200Q speakers, and a 1 farad rockford fosgate capacitor. I think that it sucks that I can`t have the gains turned up very high, i spendt over $2000 in stereo equipment....
Posted By: forbidden
Date Posted: April 01, 2004 at 2:10 PM
That is a good thing actually, a gain is designed to be turned down. It is not a volume control, it is a a matching device for the different cd players that haev different output voltages. This is more of a bad match of amplifiers and subs, what you are doing is trying to use a Chevy Cavalier engine to power a Western Star. I'm sure you get the drift now. The amp is book rated as 800w x1 @ 4 ohm mono load, this is a little bit of a stretch for power output to say the least. Here is how I would wire your subs to your amp to prevent the amp from going into protection due to low impendence, this will not however stop the amp from going into thermal protection, what you need if you want it loud, is a much larger amp. Wiring Option #2
 ------------- Top Secret, I can tell you but then my wife will kill me.
Posted By: bullard2003
Date Posted: April 01, 2004 at 11:51 PM
OK, thanks alot, but one more question:
On my subs i thought it was DVC but looking at it it has 4 negative input and 4 positive input. Is that just a way to get more power to the dual voice coils or is it 4 voice coils? There is two (-) next to each other and two (+) right next to each other, and the same on the other side. if that is 4 voice coils i`d be running about a .5 ohm load per channel. I`ll try to find a pic of the speaker.
Oh yeah, you said the amp is 800w X 1, which is true, but please note that Audiobahn rates everything in RMS, so its about 1600w peak.
Posted By: bullard2003
Date Posted: April 01, 2004 at 11:55 PM
here is a pic of the speakers, of course you cant tell but like i said, the left two are + and right two are -. Its the same on the other side.
Posted By: superstreet786
Date Posted: April 01, 2004 at 11:58 PM
pic doesnt show?
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---- 1996 Chevy S10 ----
1 Lightning Audio S2.600.2 Amp
2 Lightning Audio 12" Subs
1 Lightning Audio 1 Farad Cap
Posted By: bullard2003
Date Posted: April 02, 2004 at 12:02 AM
sorry, here it is (hopefully):
its here.....
Posted By: forbidden
Date Posted: April 02, 2004 at 12:27 AM
No you do not have 4 voice coils, what the extra terminals are for is for ease of wire connection for parallel and series wiring for multiple speakers. Nice try though.
-------------
Top Secret, I can tell you but then my wife will kill me.
Posted By: Paradigm
Date Posted: April 02, 2004 at 7:49 AM
Don't even worry about the peak power. What you should know and pay attention to is the RMS power.
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VEHICLE: 2002 GMC Sonoma ZR2
Alpine CDA-7940
AudioControl EQT x2
JL Audio 1000/1
JL Audio 10W6 (originals) x3
Kicker ZR120
Kicker ZR460
Polk GXR-6 x4
Polk GXR-4 x2
Posted By: DYohn
Date Posted: April 02, 2004 at 8:43 AM
The A8000T has two 30-amp fuses, so the peak power will be around 875 watts at 14.4volts. This amp is rated at 400 watts RMS into 4 ohms to achieve the S/N, frequency response and THD numbers it publishes. It is not a bad amp as long as you don't push it too hard. It is 2-ohm stable.
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