I have a pioneer deck [DEH-P4650mp] running via 2 rca cables to a boss BA2900 anp [1000 watt 4 chennel] the amp is powering a set of pioneer 6 inch splits and pioneer 6*9s in the back, then i have twin pioneer 15 inch 700watt max subs being powered of a sound storm D500.4 [2000wat max, 220 watt rms 4 chennel] the chennels are bridged so each sub has 2 chennels. with my rca cables the deck only has 2 outputs so have "y splits" so that there are then 4 rca cables which all go to my boss amp, then on the boss amp there are 2 rca outputs which also have "y slpits" into 4 rca outputs which go into the sound storm amp which powers the subs.
My problem is when I turn off the deck or turn off the car or change radio station or put in a cd there is a loud pop out of the 6inch splits and the 6*9s and at the same time the subs go nuts and for about 2-3 seconds will give out a loud bass boom sound, i think the problem slightly lessens when i turn down the volume and the sub control on the sound storm amp that is powering the subs but i cant seem to get rid of it and it sounds like it could be doing dammage,
The battery in the car is a standard but old 7 plate im planning to upgrade to a 15 plate battery but i have not had time to yet, im guess ing that either the old not very good battery or the rca cables have something to do with it.
Replies (20)
ttocs on 01/24/2005 22:43:45
I would guess that it as something to do with the deck. It is possable that it has something to do with the signal being very weak from splitting it so many times, and you have to compensate by turning the amp up. By doing this you are probably picking up a little of the noise from the deck. Try disconnecting 2, then 4 of the rca's until you have only two speakers hooked up and see what happens.
If this is the problem you can probably fix it with a line driver, or maybe an EQ.
Let me/us know what happens and we will go from there.
danielm87 on 01/24/2005 22:50:57
Check and make sure that your remote lead wire for the amp is going to the blue wire at the HU. I had a friend who had some idiot electrician put his remote turn on wire in the car's fuse box, and whenever someone opened a door or the trunk or turned the key the subs would play a monotonous booming sound for a few seconds. Other wise ya know, just listen to the experts.
15-11-1988 on 01/24/2005 23:35:54
that sound right because i never had the problem untill i put in the second amp and subs, could adjusting the gain do anything?? The remote is going to the first amp [the boss] then another blue wire is bridged to the second amp
15-11-1988 on 01/25/2005 00:03:28
I tryed taking out the fuse for the amp that runs the subs so that it wouldnt turn on, when i turned on the deck so that it just played with the splits and 6*9s there was no deafining noise, there was a little noise but not enough to worry about nothing out of the ordanary. Should i try shortening the rca cables that go from the boss amp to the second amp as they are about 1.5 meters long [4 feet] and then there are the y splits on the end.
15-11-1988 on 01/25/2005 07:25:57
Just had an idea the sound storm amp that is powering the subs has a high level inputs, if i use the high level inputs to the sound storm amp and rca cabels to the first boss amp I think it shoud fix the problem. If this sound right or wrong please tell me!!!
15-11-1988 on 01/25/2005 20:09:34
anyone???
UKinstaller on 01/25/2005 20:21:22
check the grounds on your amps. what are they grounded to?? sometimes random popping noises are caused by the amp or amps not being properly grounded, and they attempt to ground through the RCA's.
-UK
15-11-1988 on 01/25/2005 20:39:28
yeah the grounds are good, they are grounged to bair metal that was sanded to romove paint and bolted down, do you think using the high level input for my sub amps will work, it sounds like the only logical thing, having 2 outputs from the deck split into 8 to power the amps sound like asking a bit to much to me.
ttocs on 01/25/2005 23:49:20
What is the gain on the sub amp turned to? Try turning it down.
15-11-1988 on 01/26/2005 02:09:54
15-11-1988 on 01/26/2005 02:11:39
It gets less with the gain turned all the way down, sould i leave the gain at the lowest setting and use more volume or will it be bad for my amp and deck
ttocs on 01/26/2005 09:20:03
what was it at? The gain should probably not be more the 2/3 -3/4 of the ax. I think spitting the decks 2 outputs, 3 times each has caused it to become a little weak. Now the signal to noise ratio is lower, and you have to compensate by turning the amp up which is amplifying the noise, as well as the music, but in that order. just for kicks try disconnecting everything but the subs. Bet the noise goes away when the deck only drives 2 speakers....
15-11-1988 on 01/26/2005 19:23:36
The gain was at half on the boss amp, the sound storm amp doesnt have any controls labled gain but there is one labeled level is that the same as gain?? The level controll is at min.
When either of the amps is disconected by remomving the fuse so that it wont turn on there is no noise but when both of the amps are on there is. What else should I do?
15-11-1988 on 01/26/2005 23:03:54
I still think using high level inputs for the sand storm amp will work, any comments??
MrBrownstone on 01/27/2005 02:33:46
The RCAs probably isn't the issue, it's probably an issue with the deck. Gains turned up to high attracts a lot of noise issues. You can probably split the RCAs 4 or 5 times...although why would be a better question.
try using the system with the gains turned all the way down. Grounding may be an issue, but we need to limit all the factors first.
My guess, it's the new amp or a setting you are using.
My guess is that one of your amps is not properly isolated (defective either by design or accident) and is picking up some noise.
Are you using any external crossovers, EQs? etc.?
Bigeazy4387 on 01/27/2005 11:02:07
aight check it out man i had the same prob with my power acoustik amp it turned out that the rca connections on the amp were loose check them if they are just take the amp apart and tighten them
swez on 01/27/2005 12:59:23
Amp gain settings have a good deal to do with unwanted noise intrusions. Also, if the HU is not properly grounded (bare metal) it may give problems as mentioned too.
It seems as though the HU is not putting out enough RCA voltage. Splitting them only worsens the situation. Proof... when you disconnected the sub amp from the circuit, the other amp was OK.
The best fix, would be to install a Line driver or EQ/LD between HU and amps. It would need 2-4 inputs and 6 outs. The other option would be to replace the older HU with a newer model that has additional RCA outs and a 4 volt output. In the long run, that's probably the most cost effective way to go.
Swez
PS DO NOT USE HIGH LEVEL AND RCA INPUTS OFF THE SAME AMP. They are not suited for that kind of hookup and damage to amp is likely.
15-11-1988 on 01/27/2005 21:32:50
The head unit I have is brand new 2004 model [ DEH-P4650MP ][its the one with blue screen and green buttons] when I bought it I asumed for the price I was paying it shoud have everything I needed.
Today i put a new ground wire on the head unit, I used the negative cable that comes of the cigaret lighter so it should be quiet good.
But when I pulled out the head unit the blue remote wire got caught on the heater controls under where the head unit is and it got pulled out of the the plastic thing that all the cables are in [power cables and high level outputs] so at the moment there are 12 possible holes that the remote wire could be pluged into, I put it in the one I thought was right one but nothing happened, so I tessted all fuses and that the blue controll cable wasnt broken and they were all good.
So I wont know if I fixed the problem untill I find out where the remote cable is ment to be pluged in. In australia we call this kind of extreme bad luck murphys law.
15-11-1988 on 01/28/2005 00:38:36
After trying different places for a long time I found where the blue remote cable goes. With the gain dials all turned to minimum the noise is alot less and only comes when the head unit is turned off. So I think I will just leave all the gains down and not bother trying the high level inputs.
swez on 01/28/2005 09:11:00
O'Brian's Law: "Murphy was an optimist"
OK, seems like the noise issues are getting better here. If that HU has a low RCA output voltage (<2.5 volts) it may need some extra help to boost the line voltage above 4 volts or so.
A Line Driver will help a lot to boost RCA line voltage to a point where you can get more power from amps with adequate gain settings. The LD will raise signal levels above noise you have noted, assuming the noise is not coming from your HU.
Swez
My problem is when I turn off the deck or turn off the car or change radio station or put in a cd there is a loud pop out of the 6inch splits and the 6*9s and at the same time the subs go nuts and for about 2-3 seconds will give out a loud bass boom sound, i think the problem slightly lessens when i turn down the volume and the sub control on the sound storm amp that is powering the subs but i cant seem to get rid of it and it sounds like it could be doing dammage,
The battery in the car is a standard but old 7 plate im planning to upgrade to a 15 plate battery but i have not had time to yet, im guess ing that either the old not very good battery or the rca cables have something to do with it.
Replies (20)
ttocs on 01/24/2005 22:43:45
I would guess that it as something to do with the deck. It is possable that it has something to do with the signal being very weak from splitting it so many times, and you have to compensate by turning the amp up. By doing this you are probably picking up a little of the noise from the deck. Try disconnecting 2, then 4 of the rca's until you have only two speakers hooked up and see what happens.
If this is the problem you can probably fix it with a line driver, or maybe an EQ.
Let me/us know what happens and we will go from there.
danielm87 on 01/24/2005 22:50:57
Check and make sure that your remote lead wire for the amp is going to the blue wire at the HU. I had a friend who had some idiot electrician put his remote turn on wire in the car's fuse box, and whenever someone opened a door or the trunk or turned the key the subs would play a monotonous booming sound for a few seconds. Other wise ya know, just listen to the experts.
15-11-1988 on 01/24/2005 23:35:54
that sound right because i never had the problem untill i put in the second amp and subs, could adjusting the gain do anything?? The remote is going to the first amp [the boss] then another blue wire is bridged to the second amp
15-11-1988 on 01/25/2005 00:03:28
I tryed taking out the fuse for the amp that runs the subs so that it wouldnt turn on, when i turned on the deck so that it just played with the splits and 6*9s there was no deafining noise, there was a little noise but not enough to worry about nothing out of the ordanary. Should i try shortening the rca cables that go from the boss amp to the second amp as they are about 1.5 meters long [4 feet] and then there are the y splits on the end.
15-11-1988 on 01/25/2005 07:25:57
Just had an idea the sound storm amp that is powering the subs has a high level inputs, if i use the high level inputs to the sound storm amp and rca cabels to the first boss amp I think it shoud fix the problem. If this sound right or wrong please tell me!!!
15-11-1988 on 01/25/2005 20:09:34
anyone???
UKinstaller on 01/25/2005 20:21:22
check the grounds on your amps. what are they grounded to?? sometimes random popping noises are caused by the amp or amps not being properly grounded, and they attempt to ground through the RCA's.
-UK
15-11-1988 on 01/25/2005 20:39:28
yeah the grounds are good, they are grounged to bair metal that was sanded to romove paint and bolted down, do you think using the high level input for my sub amps will work, it sounds like the only logical thing, having 2 outputs from the deck split into 8 to power the amps sound like asking a bit to much to me.
ttocs on 01/25/2005 23:49:20
What is the gain on the sub amp turned to? Try turning it down.
15-11-1988 on 01/26/2005 02:09:54
15-11-1988 on 01/26/2005 02:11:39
It gets less with the gain turned all the way down, sould i leave the gain at the lowest setting and use more volume or will it be bad for my amp and deck
ttocs on 01/26/2005 09:20:03
what was it at? The gain should probably not be more the 2/3 -3/4 of the ax. I think spitting the decks 2 outputs, 3 times each has caused it to become a little weak. Now the signal to noise ratio is lower, and you have to compensate by turning the amp up which is amplifying the noise, as well as the music, but in that order. just for kicks try disconnecting everything but the subs. Bet the noise goes away when the deck only drives 2 speakers....
15-11-1988 on 01/26/2005 19:23:36
The gain was at half on the boss amp, the sound storm amp doesnt have any controls labled gain but there is one labeled level is that the same as gain?? The level controll is at min.
When either of the amps is disconected by remomving the fuse so that it wont turn on there is no noise but when both of the amps are on there is. What else should I do?
15-11-1988 on 01/26/2005 23:03:54
I still think using high level inputs for the sand storm amp will work, any comments??
MrBrownstone on 01/27/2005 02:33:46
The RCAs probably isn't the issue, it's probably an issue with the deck. Gains turned up to high attracts a lot of noise issues. You can probably split the RCAs 4 or 5 times...although why would be a better question.
try using the system with the gains turned all the way down. Grounding may be an issue, but we need to limit all the factors first.
My guess, it's the new amp or a setting you are using.
My guess is that one of your amps is not properly isolated (defective either by design or accident) and is picking up some noise.
Are you using any external crossovers, EQs? etc.?
Bigeazy4387 on 01/27/2005 11:02:07
aight check it out man i had the same prob with my power acoustik amp it turned out that the rca connections on the amp were loose check them if they are just take the amp apart and tighten them
swez on 01/27/2005 12:59:23
Amp gain settings have a good deal to do with unwanted noise intrusions. Also, if the HU is not properly grounded (bare metal) it may give problems as mentioned too.
It seems as though the HU is not putting out enough RCA voltage. Splitting them only worsens the situation. Proof... when you disconnected the sub amp from the circuit, the other amp was OK.
The best fix, would be to install a Line driver or EQ/LD between HU and amps. It would need 2-4 inputs and 6 outs. The other option would be to replace the older HU with a newer model that has additional RCA outs and a 4 volt output. In the long run, that's probably the most cost effective way to go.
Swez
PS DO NOT USE HIGH LEVEL AND RCA INPUTS OFF THE SAME AMP. They are not suited for that kind of hookup and damage to amp is likely.
15-11-1988 on 01/27/2005 21:32:50
The head unit I have is brand new 2004 model [ DEH-P4650MP ][its the one with blue screen and green buttons] when I bought it I asumed for the price I was paying it shoud have everything I needed.
Today i put a new ground wire on the head unit, I used the negative cable that comes of the cigaret lighter so it should be quiet good.
But when I pulled out the head unit the blue remote wire got caught on the heater controls under where the head unit is and it got pulled out of the the plastic thing that all the cables are in [power cables and high level outputs] so at the moment there are 12 possible holes that the remote wire could be pluged into, I put it in the one I thought was right one but nothing happened, so I tessted all fuses and that the blue controll cable wasnt broken and they were all good.
So I wont know if I fixed the problem untill I find out where the remote cable is ment to be pluged in. In australia we call this kind of extreme bad luck murphys law.
15-11-1988 on 01/28/2005 00:38:36
After trying different places for a long time I found where the blue remote cable goes. With the gain dials all turned to minimum the noise is alot less and only comes when the head unit is turned off. So I think I will just leave all the gains down and not bother trying the high level inputs.
swez on 01/28/2005 09:11:00
O'Brian's Law: "Murphy was an optimist"
OK, seems like the noise issues are getting better here. If that HU has a low RCA output voltage (<2.5 volts) it may need some extra help to boost the line voltage above 4 volts or so.
A Line Driver will help a lot to boost RCA line voltage to a point where you can get more power from amps with adequate gain settings. The LD will raise signal levels above noise you have noted, assuming the noise is not coming from your HU.
Swez
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