G-Difficult Posted September 11, 2016 Report Share Posted September 11, 2016 Hey, I've had system hiss for a while now, nothing too bad but I'm sick of it and finally ready to (try) to take care of it once and for all. What I have is a powerbass processor that I plug my phone directly into, that goes low level to two amps, a RF T1000 and a RF 400.4, component set in the front, coaxials in the back,and two 12'' subs taking care of the bass. Power supply is factory alternator and battery with an additional small XS Power battery. what I've tried: Better Amp Ground: For awhile i have wanted an extra battery so I took this as my chance to give the amp a better ground as well. so i put in my battery in the trunk, ran 1/0 power and ground to the front and attached them to their respective terminals on the front battery. No change in noise. Better Ground for the Possessor: Then, I was sure it was the processor ground, because it started when I installed it and i just took a tap off of the radio ground. So I took a 14 gauge wire I had around and ran it directly to the front battery (about a 3'-4' run). No change in the noise. What I've tested: Unplugged the RCA's From the Amp: Noise persisted. Used Multi Meter to Measure Impedance: So next I tested impedance between the RCA jacks and the negative terminal to the battery in the trunk. It read as a direct short but I think the results were not accurate because all jacks read that on both amps...not sure. My questions to you guys are, what should I try next? i'm thinking about upgrading the factory ground to the chases. i know it should have been done sooner but i ran out of 1/0 and it looks like a huge PITA to do the big three because its a 13 ford fusion. i cant even find the factory grounds. Also, what may be wrong with the amp, if the problem is in the amp. Do you think it is most likely the amp? Also should I ground the second battery to the trunk? I'm not sure if that would have a positive or negative affect. Link to comment Share on other sites More sharing options...
Wehan Posted September 11, 2016 Report Share Posted September 11, 2016 Pull the amp and bench test it, will save you a ton of work if its the amp and not the install/car. Link to comment Share on other sites More sharing options...
SkarredSierra Posted September 11, 2016 Report Share Posted September 11, 2016 Maybe its the processor. Try plugging your phone directly into your amp using an aux jack to rca converter and play music to see if it goes away. May also be your rcas. Link to comment Share on other sites More sharing options...
MrSkippyJ Posted September 11, 2016 Report Share Posted September 11, 2016 Maybe its the processor. Try plugging your phone directly into your amp using an aux jack to rca converter and play music to see if it goes away. May also be your rcas. probably none of that, he said the problem existed without RCAs plugged in. F150: Stock 2019 Harley Road Glide: Amp: TM400Xad - 4 channel 400 watt Processor: DSR1 Fairing (Front) 6.5s -MMats PA601cx Lid (Rear) 6x9s - TMS69 Link to comment Share on other sites More sharing options...
SkarredSierra Posted September 11, 2016 Report Share Posted September 11, 2016 My bad. Missed that part. Link to comment Share on other sites More sharing options...
G-Difficult Posted September 11, 2016 Author Report Share Posted September 11, 2016 Maybe its the processor. Try plugging your phone directly into your amp using an aux jack to rca converter and play music to see if it goes away. May also be your rcas. Maybe its the processor. Try plugging your phone directly into your amp using an aux jack to rca converter and play music to see if it goes away. May also be your rcas.probably none of that, he said the problem existed without RCAs plugged in. Yeah like he said, that's what I was hoping, but when I unplugged them and it kept going. I'm going to take it to an audio shop tomorrow and see. Ill keep update on the results Link to comment Share on other sites More sharing options...
MrSkippyJ Posted September 11, 2016 Report Share Posted September 11, 2016 My bad. Missed that part. figured so F150: Stock 2019 Harley Road Glide: Amp: TM400Xad - 4 channel 400 watt Processor: DSR1 Fairing (Front) 6.5s -MMats PA601cx Lid (Rear) 6x9s - TMS69 Link to comment Share on other sites More sharing options...
ShadeTreeMechanic Posted September 12, 2016 Report Share Posted September 12, 2016 Turn the amp gain down. 91 C350 Centurion conversion ( Four Door One Ton Bronco) 250A Alternator (Second Alternator Coming Soon) G65 AGM Up Front / Two G31 AGM in Back Pioneer 80PRS CT Sounds AT125.2 / CT Sounds 6.5 Strato Pro component Front Stage CT Sounds AT125.2 / Lanzar Pro 8" coax w/compression horn tweeter Rear Fill FSD 5000D 1/2 ohm (SoundQubed 7k Coming Soon) Two HDS315 Four Qubes Each 34hz (Two HDC3.118 and New Box Coming Soon) Link to comment Share on other sites More sharing options...
G-Difficult Posted September 12, 2016 Author Report Share Posted September 12, 2016 Turn the amp gain down. I tuned it with the dd-1. And before I did that, I had the gain turned down significantly lower, it still had the hissing but not as loud. Link to comment Share on other sites More sharing options...
MrSkippyJ Posted September 12, 2016 Report Share Posted September 12, 2016 have you taken the amp out of the car and bench tested it yet? Or at least tested it inside the car without using the wiring that is in the car right now? If not get a pair of speakers and wire them directly to the amp and see if the sound is still there. No RCA input hooked up, just power and speaker wires/speakers. F150: Stock 2019 Harley Road Glide: Amp: TM400Xad - 4 channel 400 watt Processor: DSR1 Fairing (Front) 6.5s -MMats PA601cx Lid (Rear) 6x9s - TMS69 Link to comment Share on other sites More sharing options...
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