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    Xtremevette's Avatar
    Xtremevette is offline Junior Member



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    Got a weird noise in my system after new amp installed...need some help

    Ok so before everybody hits me with SEARCH....my problem is pretty unique in the sound it is making.

    I have a 5 channel amp and it is noise free...no problems. (except some minor alternator whine)
    I have a 4 channel amp and it too was noise free. (except some minor alternator whine)

    I decided to try a different 4 channel and after I installed it with no other changes, I now have a weird noise that I had originally but thought I got rid of by changing grounds and moving wires around. With the car off, not running, when I power up the amps and have the gains all the way down, volume all the way down, I get a medium/high pitch hum that after a second or two starts to play random tones. Sounds like a computer star trek hearing test or something. If I increase the gains...the noise gets worst.

    This amp is brand new. It is a Soundstream Picasso Nano 4.320. My old amp is a Boss Chaos.

    Now I have had this system noise since day one but after messing around with grounds and moving wires I was able to get rid of it with the Boss Amp. Now its back when the only thing I have done is change amps. ???

    Need some help/advice. I have tried everything. It is really weird.
    Could the Picasso 4 channel be bad or just built differently that it picks up noise more? Iam not sure how amps work to pick up on noise or filter it out.

    My 5 channel (Planet Audio amp) doesn't have this problem at all. I tried my new Soundstream Ref 5.1000 amp and it to does not have the problem.

    I do have an elaborate setup since Iam running a 5 channel and 4 channel amp. I have 2 sets of RCAs (front and rear) coming from my head unit going into a DSP/EQ. The DSP/EQ has 3 sets of RCA's that come out of it, 1 set is for subs and 1 set is for Ch 1&2 and both sets go directly to the 5 channel. The last set goes to a line driver/center channel processor as it's main input. The line driver/center channel processor then has 1 set going to the 5 channel as Ch 3&4 and 2 sets go to the 4 channel. This way I have not used Y adapters and all the splitting is being done actively by the processor.

    With the line driver/center processor out of the loop I still get the same problem.

    This has been driving me nuts. I mean I am grateful that I got rid of it with my old amp, but puzzled why with only changing to the new amp that the noise is back only x10 worst then when I started. Are amps picky and require you to move the grounds? Meaning one amp may like ground point A and another may like ground point B?

    I dunno its a very strange sound..not a typical hum or hiss. This sounds more like I am hearing my cars computer through my speakers when I turn my amps on.

    I also get alternator whine too with either amp. With the Boss I get less.

    Iam using premium top notch monster cables.
    I have my RCAs running down the center of my car and have tried moving them...doesn't help.
    I have my power running all by itself down the right side of the car...it doesn't come near the RCA's except in the rear where it has to cross over them. I did hold the RCA's up at this position, it didn't make any difference. Noise still present.

    I was going to try to remove the EQ just for ha'ha's but was still thinking...the probably had been eliminated to the point I can't hear it with my old amp but yet can with the new amp...so hmmm do I really want to try this. Sounds like the amp is faulty or just overly sensitive in amplifying the noise vs my boss unit?

    Oh and I pulled both RCA's off the input to the amp. Problem when away. Of course I have no sound then at all though. So the sound is being introduced through the RCAs or a combination of something once the RCAs are plugged in. I tried using a set that was originally going directly from the DSP to the 5 channel, I still get the same problem out of the 4 channel but not out of the 5 channel.







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    Re: Got a weird noise in my system after new amp installed...need some help

    What HU are you using?




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    knightsdaze's Avatar
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    Re: Got a weird noise in my system after new amp installed...need some help

    Quote Originally Posted by Xtremevette View Post
    Ok so before everybody hits me with SEARCH....my problem is pretty unique in the sound it is making.

    I have a 5 channel amp and it is noise free...no problems. (except some minor alternator whine)
    I have a 4 channel amp and it too was noise free. (except some minor alternator whine)

    I decided to try a different 4 channel and after I installed it with no other changes, I now have a weird noise that I had originally but thought I got rid of by changing grounds and moving wires around. With the car off, not running, when I power up the amps and have the gains all the way down, volume all the way down, I get a medium/high pitch hum that after a second or two starts to play random tones. Sounds like a computer star trek hearing test or something. If I increase the gains...the noise gets worst.

    This amp is brand new. It is a Soundstream Picasso Nano 4.320. My old amp is a Boss Chaos.

    Now I have had this system noise since day one but after messing around with grounds and moving wires I was able to get rid of it with the Boss Amp. Now its back when the only thing I have done is change amps. ???

    Need some help/advice. I have tried everything. It is really weird.
    Could the Picasso 4 channel be bad or just built differently that it picks up noise more? Iam not sure how amps work to pick up on noise or filter it out.

    My 5 channel (Planet Audio amp) doesn't have this problem at all. I tried my new Soundstream Ref 5.1000 amp and it to does not have the problem.

    I do have an elaborate setup since Iam running a 5 channel and 4 channel amp. I have 2 sets of RCAs (front and rear) coming from my head unit going into a DSP/EQ. The DSP/EQ has 3 sets of RCA's that come out of it, 1 set is for subs and 1 set is for Ch 1&2 and both sets go directly to the 5 channel. The last set goes to a line driver/center channel processor as it's main input. The line driver/center channel processor then has 1 set going to the 5 channel as Ch 3&4 and 2 sets go to the 4 channel. This way I have not used Y adapters and all the splitting is being done actively by the processor.

    With the line driver/center processor out of the loop I still get the same problem.

    This has been driving me nuts. I mean I am grateful that I got rid of it with my old amp, but puzzled why with only changing to the new amp that the noise is back only x10 worst then when I started. Are amps picky and require you to move the grounds? Meaning one amp may like ground point A and another may like ground point B?

    I dunno its a very strange sound..not a typical hum or hiss. This sounds more like I am hearing my cars computer through my speakers when I turn my amps on.

    I also get alternator whine too with either amp. With the Boss I get less.

    Iam using premium top notch monster cables.
    I have my RCAs running down the center of my car and have tried moving them...doesn't help.
    I have my power running all by itself down the right side of the car...it doesn't come near the RCA's except in the rear where it has to cross over them. I did hold the RCA's up at this position, it didn't make any difference. Noise still present.

    I was going to try to remove the EQ just for ha'ha's but was still thinking...the probably had been eliminated to the point I can't hear it with my old amp but yet can with the new amp...so hmmm do I really want to try this. Sounds like the amp is faulty or just overly sensitive in amplifying the noise vs my boss unit?

    Oh and I pulled both RCA's off the input to the amp. Problem when away. Of course I have no sound then at all though. So the sound is being introduced through the RCAs or a combination of something once the RCAs are plugged in. I tried using a set that was originally going directly from the DSP to the 5 channel, I still get the same problem out of the 4 channel but not out of the 5 channel.
    Schizophrenics are people too!!



    Electrical- 200amp alt- Optima yellow tops front+back- stinger 10 farad cap- cadence 1/0awg+stinger+knu fuses
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    EQ- Audiocontrol Four.1
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    Front stage-B.A pro 50se (in sealed centrapod)
    Soundbar- Jbl p652 (NOT for long)
    Midbass- Jl cw800 (in sealed intrapod)
    Subs- 1 RExxx 12 in cust tuned 33hz box@1ohm (thank u Mobile Enclosures)
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    knightsdaze's Avatar
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    Re: Got a weird noise in my system after new amp installed...need some help

    I'm sorry.. I feel like,. I just got hit with.. ummmm , a 2 ton.. heavy thing



    Electrical- 200amp alt- Optima yellow tops front+back- stinger 10 farad cap- cadence 1/0awg+stinger+knu fuses
    Head unit- Pioneer 9400bh
    EQ- Audiocontrol Four.1
    Active x/over- Audiocontrol 6xs
    Front stage-B.A pro 50se (in sealed centrapod)
    Soundbar- Jbl p652 (NOT for long)
    Midbass- Jl cw800 (in sealed intrapod)
    Subs- 1 RExxx 12 in cust tuned 33hz box@1ohm (thank u Mobile Enclosures)
    Amps- Sub-Orion hcca 2500.1/ Midbass-Alpine pdx 2.150/Components- Alpine pdx 4.150

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    butterMilk's Avatar
    butterMilk is offline Senior VIP Member



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    Re: Got a weird noise in my system after new amp installed...need some help

    Bet ya didnt even read it




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