i have: pioneer 960 deck, JL 6.5, 6*9, and 10's, eclipse 33230 2 ch amp, coustic 625x 6 ch (only using 4 ch)
i put everything in about 7 months ago and everything worked great untill about a month ago something happened and i got alot of engine hiss and even when the car is off there is hiss but not much....i have checked all the the connections twice now and everything is good, i ran an outside audio source into the amps and everything sounds great so that means the problem is in the deck....i have taken it out and ran it strait off the battery to makesure it wasnt something is the wire harnis and i still have all of the noise.......PLEASE HELP ME im starting to pull my hair out.
Replies (12)
ttocs on 07/18/2006 09:47:43
what kind of car? Of course always start simple by checking the ground and power connections.
swez on 07/18/2006 12:18:49
Hummm, seems like the amp is not the source as you tested it with another player.
The next place to look would be the HU grounding line. The Premier P890 has a black wire with a metal clip on it, coming off the main harness. It needs to be well grounded to metal in the dash, floor pan or firewall. That cures about 90% of noise problems in most Aftermarket HU systems.
If the orginal ground was only to the OEM harness and then to stock wiring ground, that may be inadequate now. Something has changed since the original install was done. The trick is to find out what changed.
As ttocs mentioned, start with the simple things and then go deeper as needed.
Swez
lilschtive on 07/18/2006 12:19:46
If you have a wire brush, unplug both the plugs on your battery. Then, scrub the battery connections on both sides to get all the grim off of them and to make the connection more liable. Make sure everything on the battery that goes to the audio is nice and tight and cleaned up to get the most powerfull connection.
ralter649 on 07/18/2006 14:14:07
it is in an 03 cavalier....i took the deck out and hooked it up off the gold post on the battery so i know its not in the connections or the wire harnis and i know batttery is clean
swez on 07/18/2006 17:54:00
Good that you mentioned that point.
Best guess, based on what you have done already and how it came on suddenly after being AOK for several months, it seems to point to a faulty HU. Question now is, do you have a good warranty plan from the seller?
Give them a heads up and see what options are available for repairs or a swap out for a known good HU replacement.
Good luck,
Swez
ttocs on 07/18/2006 20:42:34
wait wait wait..... I had a though(that happens from time to time). You ran a new source into the amps but did you run it through the same rca's? Its unlikely but you could have a bad rca. Try a new set just temporarily ran above everything from the HU to the amp to see what happens. If you still have noise then I will agree it is the HU.
swez on 07/19/2006 07:41:20
A constant high frequency buzz or hiss from the tweeters is often a sign of improper gain matching between the HU (Source) and the amplifier(s) used for mid/highs.
Also, there are filters (in the HU board design) that should normally limit this problem. If the problem is heard with or without the engine running, but was not there before, something has changed.
1. The amp gains for the mid/highs are set too high (sensitivity)
2. Noisy preamps in the source unit (some internal noise blanking filters have failed)
If RCA's are suspect, we usually get engine whine or a constant low frequency hum or buzz out of the speakers. In this case, he stated that he connected the HU directly to a car BAT and the noise was still there.
Three questions...
1. When you performed this test, did you use RCA's to amped speakers or just the HU amplifiers to power a test speaker?
2. Have you installed any new speakers (tweeters) of late and all of a sudden, you have this hiss?
3. What is the amp gain sensitivity settings for your Mid/highs?
Swez
ttocs on 07/19/2006 09:50:10
like I said it is a long shot but we should check the cables before replacing the deck......
swez on 07/19/2006 12:31:52
Right, an obvious/not so obvious step in certain types of noise issues. Unfortunately, this one may be less easy to resolve.
The best way to determine if the HU is faulty, hook it up to a power supply like a car battery (not in the a car) and some decent full range speakers. (4-8 ohms) Then, toss in a CD with some very quiet passages of music and listen for that "HISS".
If the hiss is present, then we know the HU is likely to have some internal problems.
Swez
ralter649 on 07/19/2006 14:47:53
swez.....i ran a new set of RCAs when i did the test, no i didnt put in new speakers (when i when from factory i hanged everything at once), and it doesnt matter where the gain is set it hisses and crakles all the time.
ttocs....i have replaced the RCAs and it didnt help
i dont know if this matters but the noise not like a little noise its loud like im afraid its going to hurt the speakers its so loud.....and the noise is there even when the vol. is all the way down
ttocs on 07/19/2006 16:39:18
then it does sound like you HU.
swez on 07/19/2006 19:02:31
Agreed! If you still have a warranty, give the seller a call and arrange for a service RMA.
In the meantime, consider buying a low cost HU as a backup while your Premier is out of commission. At least you'll have music while you wait it out.
Swez
i put everything in about 7 months ago and everything worked great untill about a month ago something happened and i got alot of engine hiss and even when the car is off there is hiss but not much....i have checked all the the connections twice now and everything is good, i ran an outside audio source into the amps and everything sounds great so that means the problem is in the deck....i have taken it out and ran it strait off the battery to makesure it wasnt something is the wire harnis and i still have all of the noise.......PLEASE HELP ME im starting to pull my hair out.
Replies (12)
ttocs on 07/18/2006 09:47:43
what kind of car? Of course always start simple by checking the ground and power connections.
swez on 07/18/2006 12:18:49
Hummm, seems like the amp is not the source as you tested it with another player.
The next place to look would be the HU grounding line. The Premier P890 has a black wire with a metal clip on it, coming off the main harness. It needs to be well grounded to metal in the dash, floor pan or firewall. That cures about 90% of noise problems in most Aftermarket HU systems.
If the orginal ground was only to the OEM harness and then to stock wiring ground, that may be inadequate now. Something has changed since the original install was done. The trick is to find out what changed.
As ttocs mentioned, start with the simple things and then go deeper as needed.
Swez
lilschtive on 07/18/2006 12:19:46
If you have a wire brush, unplug both the plugs on your battery. Then, scrub the battery connections on both sides to get all the grim off of them and to make the connection more liable. Make sure everything on the battery that goes to the audio is nice and tight and cleaned up to get the most powerfull connection.
ralter649 on 07/18/2006 14:14:07
it is in an 03 cavalier....i took the deck out and hooked it up off the gold post on the battery so i know its not in the connections or the wire harnis and i know batttery is clean
swez on 07/18/2006 17:54:00
Good that you mentioned that point.
Best guess, based on what you have done already and how it came on suddenly after being AOK for several months, it seems to point to a faulty HU. Question now is, do you have a good warranty plan from the seller?
Give them a heads up and see what options are available for repairs or a swap out for a known good HU replacement.
Good luck,
Swez
ttocs on 07/18/2006 20:42:34
wait wait wait..... I had a though(that happens from time to time). You ran a new source into the amps but did you run it through the same rca's? Its unlikely but you could have a bad rca. Try a new set just temporarily ran above everything from the HU to the amp to see what happens. If you still have noise then I will agree it is the HU.
swez on 07/19/2006 07:41:20
A constant high frequency buzz or hiss from the tweeters is often a sign of improper gain matching between the HU (Source) and the amplifier(s) used for mid/highs.
Also, there are filters (in the HU board design) that should normally limit this problem. If the problem is heard with or without the engine running, but was not there before, something has changed.
1. The amp gains for the mid/highs are set too high (sensitivity)
2. Noisy preamps in the source unit (some internal noise blanking filters have failed)
If RCA's are suspect, we usually get engine whine or a constant low frequency hum or buzz out of the speakers. In this case, he stated that he connected the HU directly to a car BAT and the noise was still there.
Three questions...
1. When you performed this test, did you use RCA's to amped speakers or just the HU amplifiers to power a test speaker?
2. Have you installed any new speakers (tweeters) of late and all of a sudden, you have this hiss?
3. What is the amp gain sensitivity settings for your Mid/highs?
Swez
ttocs on 07/19/2006 09:50:10
like I said it is a long shot but we should check the cables before replacing the deck......
swez on 07/19/2006 12:31:52
Right, an obvious/not so obvious step in certain types of noise issues. Unfortunately, this one may be less easy to resolve.
The best way to determine if the HU is faulty, hook it up to a power supply like a car battery (not in the a car) and some decent full range speakers. (4-8 ohms) Then, toss in a CD with some very quiet passages of music and listen for that "HISS".
If the hiss is present, then we know the HU is likely to have some internal problems.
Swez
ralter649 on 07/19/2006 14:47:53
swez.....i ran a new set of RCAs when i did the test, no i didnt put in new speakers (when i when from factory i hanged everything at once), and it doesnt matter where the gain is set it hisses and crakles all the time.
ttocs....i have replaced the RCAs and it didnt help
i dont know if this matters but the noise not like a little noise its loud like im afraid its going to hurt the speakers its so loud.....and the noise is there even when the vol. is all the way down
ttocs on 07/19/2006 16:39:18
then it does sound like you HU.
swez on 07/19/2006 19:02:31
Agreed! If you still have a warranty, give the seller a call and arrange for a service RMA.
In the meantime, consider buying a low cost HU as a backup while your Premier is out of commission. At least you'll have music while you wait it out.
Swez
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