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Noise Coming Through Sound System
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<blockquote data-quote="PianoPlayer07" data-source="post: 7765678" data-attributes="member: 642119"><p>I've had a few say I've got the input gains on the amp set up wrong. Regarding input gains on the amps, they can be all the way down with the gain on the radio about 3/4 of the way turned up and the noise is still audible enough to bother you. Believe me, I know the importance of gain structure since I am a musician and am around all kinds of audio equipment all the time.</p><p></p><p>I did pick up a power filter and put it on both the constant and accessory power feeds (They only had one, will pick up another when available) and the alternator noise was removed to the point to where you would really have to be listening for it to notice. Just to verify, do I need one for the turn on wire as well or just the two power feeds? Anyways that should take care of that problem. It did NOT however affect the high pitched tone that comes through. If you'll remember I said it will not come through when I have all connections on the radio hooked up where the amps are as well as running everything off of the battery. It only happens when the unit is hooked up front in the console. What I did to find the source was I unhooked everything from the hu except the RCA cables running to the amps and the ground wire. No power connections were connected. The hu was obviously turned off since no power was connected. This high pitched tone was coming through. I could disconnect the ground wire and all noise would disappear. The noise would return by hooking the ground back up. That leads me to believe the source of this sound is through the ground wire. Even though the ground point seemed to check out as being alright and I'm using a heavier gauge wire, it must be picking up interference along the wire run somehow. I'll try grounding the hu somewhere in the back where the amps are grounded.</p><p></p><p>I hope this is a good sign, working towards a noise free system. Does my above thinking seem to be correct? Or do I need to do something different? Again, this is certainly not a gain structure issue. I'm very familiar with how to set all of that up.</p></blockquote><p></p>
[QUOTE="PianoPlayer07, post: 7765678, member: 642119"] I've had a few say I've got the input gains on the amp set up wrong. Regarding input gains on the amps, they can be all the way down with the gain on the radio about 3/4 of the way turned up and the noise is still audible enough to bother you. Believe me, I know the importance of gain structure since I am a musician and am around all kinds of audio equipment all the time. I did pick up a power filter and put it on both the constant and accessory power feeds (They only had one, will pick up another when available) and the alternator noise was removed to the point to where you would really have to be listening for it to notice. Just to verify, do I need one for the turn on wire as well or just the two power feeds? Anyways that should take care of that problem. It did NOT however affect the high pitched tone that comes through. If you'll remember I said it will not come through when I have all connections on the radio hooked up where the amps are as well as running everything off of the battery. It only happens when the unit is hooked up front in the console. What I did to find the source was I unhooked everything from the hu except the RCA cables running to the amps and the ground wire. No power connections were connected. The hu was obviously turned off since no power was connected. This high pitched tone was coming through. I could disconnect the ground wire and all noise would disappear. The noise would return by hooking the ground back up. That leads me to believe the source of this sound is through the ground wire. Even though the ground point seemed to check out as being alright and I'm using a heavier gauge wire, it must be picking up interference along the wire run somehow. I'll try grounding the hu somewhere in the back where the amps are grounded. I hope this is a good sign, working towards a noise free system. Does my above thinking seem to be correct? Or do I need to do something different? Again, this is certainly not a gain structure issue. I'm very familiar with how to set all of that up. [/QUOTE]
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