here is something crazy, i didnt notice until after i got home today, well i had all my stuff installed, you guys did help alot, ill donate a little something on this coming check. but check this if i turn my power button off so the radio is off, my subs some how come back on and a continous bass sound comes on, like no music just from the subs, bass blurrrrrrrr, one constant tone, doesnt change nothing,.. i mean when i turn my radio all the way down nothing happens, when i turn my car off nothing happens, just when i am riding with the power off on my radio, it will constantly blurr a nice sounding bass sound, but i dont keeep it on, im scared!!!! please help
Replies (8)
swez on 04/13/2007 21:23:41
That often signals a poorly grounded system. When RCA's are not well grounded to the system, this can happen. You can make it stop by pulling the input RCA's from the sub amp to proof this out. If the noise stops, you have a ground issue somewhere in the system. If the noise continues, the amp is the likely culprit and may have a loose RCA card to the board. (lifted ground)
Also, most guys wire their amps to turn off when the HU is shut off. Seems like you used an alternate method. Please explain after you try removing the RCA's from the sub amp. If the low hum still there?
Swez
30Hertz on 04/13/2007 21:45:38
I agree with Swez, sounds like a grounding issue.
However, how did you wire the REMote? Did you wire it to a constant hot? Or did you run it to the REM wire on the HU?
schust06 on 04/14/2007 09:11:46
no idea, i had this place called coast to coast customs install it for me, the RCA's and remote were already ran when i purchase the vehicle, so they didnt have to run any wires from the HU to the trunk since it was already there
swez on 04/14/2007 15:47:14
There have been a number of posts about some Pioneer HU's that are not well grounded at the RCA outs. If you have a Pioneer HU installed, we may have a fix for you.
You may need to go back to the place that did your install and have them look into the problem. Since you paid for a quality install, it should be just that... noise free.
Now, if the amp is actually the culprit, that is not an install issue. We can often test an amp for problems with a portable player that has a headphone jack and a pair of RCA's attached. (A patch cord) If the amp is quiet and perform well with this test rig, the amp is fine. The problem is upstream from that amp. Bad RCA cable, poor grounding at the HU or similar things of this nature are often the next place to look.
Swez
schust06 on 04/14/2007 20:08:14
well i know for sure i am going back to have them take a look at it, but , say its the amp!! it should be fine, right, there is no reason it should be messed up, the only time it does this is when i turn off the radio which i rarely do, i always hit mute or turn it all the way down, its just weird that now i decide to hit the power button and this happens. but of course by someone esle installing it, also they installed my amp normal, each sub getting a channel, its a Rockford Fosgate 800a2, now these subs are single 4 ohm subs, they are getting, what rockford says on there sheet 200x2 @ 4ohms, but i would say 250-280watts cause its RF,. now when the amp is bridged @ 4 ohms it gets 800x1, or as the birth sheet says 942watts, the place said since the subs are single voice coil if they bridged it, it will overheat the amp, and cause damage to the subs!??? is this true? should i say forget that an bridge it,.? these subs are 400RMS, and im giving them at the most 300 a piece if im lucky
UKinstaller on 04/15/2007 15:11:41
i don't even have to guess that this is the factory radio in the car?? it's definitely a line out converter issue, without a doubt.
the amp is still powered when you have the radio off, so the amp / rca's are looking for something to amplify, resulting in a non-stop blast of bass that won't stop until the amp is turned off, not just the radio. solution?? find the remote wire and put a switch in-line, mount it under the dash or something, and switch it off whenever the radio is off. either that or buy a little higher-ended line out converter.
-UK
swez on 04/15/2007 17:48:21
About the bridging this RF amp and running the subs @ 2 ohms... Not recommended as it is very hard on the amp. It may be fine at low-moderate listening levels, but when you kick it hard, the amp will heat up and possibley trip the thermal protection circuits. (Most likely trip I should say)
Not a fatal issue, but 2 ohms subs would be a very good option here if you bridge or go 2 channel. (A pair of stout 4+4 DVC's here, are recommended)
Comments?
Swez
schust06 on 04/16/2007 17:14:15
they are single voice coil 4ohm subs, so they should be dual 4ohm if i wanted to bridge them? and the amp would be fine? but if they were dual 4 ohm, i would just put them into a 2ohm load, and they would i know work better, cause they would be getting about 430watts a piece, instead i think as of right now like i said there probley getting just over 200 watts a piece, but there 400rms subs, i wanna give them 400 a piece, but if the amp will suffer i guess i cant.
Replies (8)
swez on 04/13/2007 21:23:41
That often signals a poorly grounded system. When RCA's are not well grounded to the system, this can happen. You can make it stop by pulling the input RCA's from the sub amp to proof this out. If the noise stops, you have a ground issue somewhere in the system. If the noise continues, the amp is the likely culprit and may have a loose RCA card to the board. (lifted ground)
Also, most guys wire their amps to turn off when the HU is shut off. Seems like you used an alternate method. Please explain after you try removing the RCA's from the sub amp. If the low hum still there?
Swez
30Hertz on 04/13/2007 21:45:38
I agree with Swez, sounds like a grounding issue.
However, how did you wire the REMote? Did you wire it to a constant hot? Or did you run it to the REM wire on the HU?
schust06 on 04/14/2007 09:11:46
no idea, i had this place called coast to coast customs install it for me, the RCA's and remote were already ran when i purchase the vehicle, so they didnt have to run any wires from the HU to the trunk since it was already there
swez on 04/14/2007 15:47:14
There have been a number of posts about some Pioneer HU's that are not well grounded at the RCA outs. If you have a Pioneer HU installed, we may have a fix for you.
You may need to go back to the place that did your install and have them look into the problem. Since you paid for a quality install, it should be just that... noise free.
Now, if the amp is actually the culprit, that is not an install issue. We can often test an amp for problems with a portable player that has a headphone jack and a pair of RCA's attached. (A patch cord) If the amp is quiet and perform well with this test rig, the amp is fine. The problem is upstream from that amp. Bad RCA cable, poor grounding at the HU or similar things of this nature are often the next place to look.
Swez
schust06 on 04/14/2007 20:08:14
well i know for sure i am going back to have them take a look at it, but , say its the amp!! it should be fine, right, there is no reason it should be messed up, the only time it does this is when i turn off the radio which i rarely do, i always hit mute or turn it all the way down, its just weird that now i decide to hit the power button and this happens. but of course by someone esle installing it, also they installed my amp normal, each sub getting a channel, its a Rockford Fosgate 800a2, now these subs are single 4 ohm subs, they are getting, what rockford says on there sheet 200x2 @ 4ohms, but i would say 250-280watts cause its RF,. now when the amp is bridged @ 4 ohms it gets 800x1, or as the birth sheet says 942watts, the place said since the subs are single voice coil if they bridged it, it will overheat the amp, and cause damage to the subs!??? is this true? should i say forget that an bridge it,.? these subs are 400RMS, and im giving them at the most 300 a piece if im lucky
UKinstaller on 04/15/2007 15:11:41
i don't even have to guess that this is the factory radio in the car?? it's definitely a line out converter issue, without a doubt.
the amp is still powered when you have the radio off, so the amp / rca's are looking for something to amplify, resulting in a non-stop blast of bass that won't stop until the amp is turned off, not just the radio. solution?? find the remote wire and put a switch in-line, mount it under the dash or something, and switch it off whenever the radio is off. either that or buy a little higher-ended line out converter.
-UK
swez on 04/15/2007 17:48:21
About the bridging this RF amp and running the subs @ 2 ohms... Not recommended as it is very hard on the amp. It may be fine at low-moderate listening levels, but when you kick it hard, the amp will heat up and possibley trip the thermal protection circuits. (Most likely trip I should say)
Not a fatal issue, but 2 ohms subs would be a very good option here if you bridge or go 2 channel. (A pair of stout 4+4 DVC's here, are recommended)
Comments?
Swez
schust06 on 04/16/2007 17:14:15
they are single voice coil 4ohm subs, so they should be dual 4ohm if i wanted to bridge them? and the amp would be fine? but if they were dual 4 ohm, i would just put them into a 2ohm load, and they would i know work better, cause they would be getting about 430watts a piece, instead i think as of right now like i said there probley getting just over 200 watts a piece, but there 400rms subs, i wanna give them 400 a piece, but if the amp will suffer i guess i cant.
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