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#1
Posted to rec.audio.car
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Amp noise - I am going to torch the entire car soon
I have three amps in my Jeep. A month ago, all three were working.
Things were good. Then I decided to make the system better by building a little cabinet for the three amps, because I am an idiot and I can't just be happy with any system, ever. Now I can't get them to work again. THE PROBLEM: I can hook up any one amp, and it works beautifully with any speakers. Once I hook up the second amp, loud constant noise comes through the speakers. THE ATTEMPTED SOLUTIONS: I have replaced all of the ground wires but I don't think they're a problem anyway since any amp works with any set of wires. They're all grounded to separate points on the chassis. I tried running it without the capacitor and it was no different. I tried switching the speakers connected to the amps but it was no different. I tried praying to practically every diety from Zeus to Jesus to Haile Selasse but it was no different. I've been trying to figure this out for a few weeks. Pretty soon I'm going to stuff a rag in the gas tank and light it all on fire. Please help me. ------------- ----------------- | | | | | battery | | head unit | | | | | ----------- -------------- | | | + | | | 1 set | | of RCA | | output | GND | jacks | | | -------------- | | capacitor | | -------------- | | | | + | GND | V | --------------- ----------------- | distribution | + | | | block |----------| amp 1 | --------------- | RF 200.4 | | \ | (bridged) | |+ \+ | | | \ ------------------- | \ | | GND \ | | | \ | audio ---------------- ----------------- | pass | | | | | thru | amp 3 | | amp 2 | | | RF 600.4 | | RF 400.4 | | | | | | ----| --------------- ---------------- | | | | | | | audio pass thru | |-----------------------------| |
#2
Posted to rec.audio.car
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Amp noise - I am going to torch the entire car soon
I'm a bit confused regarding how your RCA cables are routed. Do the amps
have a a "pass-thru" where they can come out and drive the next amp in the chain? Is the noise coming from all the amps, or just the one hooked up to the RCA's? Generally speaking, if the power and ground are good, and the speakers are wired up correctly, you should start by unplugging all the RCA's and systematically going through the inputs. If you have shorting RCA plugs (for troubleshooting) place them on the inputs to all the amps. If you get noise with shorting plugs in place, either the amp is damaged or the power supply (or power source) is bad. Then one at a time begin replacing the shorting plugs with a real signal. It kinda sounds like you have an amp with an open input which is picking up noise from it's own switching power supply. Chris wrote in message ... I have three amps in my Jeep. A month ago, all three were working. Things were good. Then I decided to make the system better by building a little cabinet for the three amps, because I am an idiot and I can't just be happy with any system, ever. Now I can't get them to work again. THE PROBLEM: I can hook up any one amp, and it works beautifully with any speakers. Once I hook up the second amp, loud constant noise comes through the speakers. THE ATTEMPTED SOLUTIONS: I have replaced all of the ground wires but I don't think they're a problem anyway since any amp works with any set of wires. They're all grounded to separate points on the chassis. I tried running it without the capacitor and it was no different. I tried switching the speakers connected to the amps but it was no different. I tried praying to practically every diety from Zeus to Jesus to Haile Selasse but it was no different. I've been trying to figure this out for a few weeks. Pretty soon I'm going to stuff a rag in the gas tank and light it all on fire. Please help me. ------------- ----------------- | | | | | battery | | head unit | | | | | ----------- -------------- | | | + | | | 1 set | | of RCA | | output | GND | jacks | | | -------------- | | capacitor | | -------------- | | | | + | GND | V | --------------- ----------------- | distribution | + | | | block |----------| amp 1 | --------------- | RF 200.4 | | \ | (bridged) | |+ \+ | | | \ ------------------- | \ | | GND \ | | | \ | audio ---------------- ----------------- | pass | | | | | thru | amp 3 | | amp 2 | | | RF 600.4 | | RF 400.4 | | | | | | ----| --------------- ---------------- | | | | | | | audio pass thru | |-----------------------------| |
#3
Posted to rec.audio.car
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Amp noise - I am going to torch the entire car soon
On Nov 29, 5:37 pm, "Christopher \"Torroid\" Ott" spamtrap at
ottelectronics dot com wrote: I'm a bit confused regarding how your RCA cables are routed. Do the amps have a a "pass-thru" where they can come out and drive the next amp in the chain? Is the noise coming from all the amps, or just the one hooked up to the RCA's? Generally speaking, if the power and ground are good, and the speakers are wired up correctly, you should start by unplugging all the RCA's and systematically going through the inputs. If you have shorting RCA plugs (for troubleshooting) place them on the inputs to all the amps. If you get noise with shorting plugs in place, either the amp is damaged or the power supply (or power source) is bad. Then one at a time begin replacing the shorting plugs with a real signal. It kinda sounds like you have an amp with an open input which is picking up noise from it's own switching power supply. Chris wrote in message ... I have three amps in my Jeep. A month ago, all three were working. Things were good. Then I decided to make the system better by building a little cabinet for the three amps, because I am an idiot and I can't just be happy with any system, ever. Now I can't get them to work again. THE PROBLEM: I can hook up any one amp, and it works beautifully with any speakers. Once I hook up the second amp, loud constant noise comes through the speakers. THE ATTEMPTED SOLUTIONS: I have replaced all of the ground wires but I don't think they're a problem anyway since any amp works with any set of wires. They're all grounded to separate points on the chassis. I tried running it without the capacitor and it was no different. I tried switching the speakers connected to the amps but it was no different. I tried praying to practically every diety from Zeus to Jesus to Haile Selasse but it was no different. I've been trying to figure this out for a few weeks. Pretty soon I'm going to stuff a rag in the gas tank and light it all on fire. Please help me. ------------- ----------------- | | | | | battery | | head unit | | | | | ----------- -------------- | | | + | | | 1 set | | of RCA | | output | GND | jacks | | | -------------- | | capacitor | | -------------- | | | | + | GND | V | --------------- ----------------- | distribution | + | | | block |----------| amp 1 | --------------- | RF 200.4 | | \ | (bridged) | |+ \+ | | | \ ------------------- | \ | | GND \ | | | \ | audio ---------------- ----------------- | pass | | | | | thru | amp 3 | | amp 2 | | | RF 600.4 | | RF 400.4 | | | | | | ----| --------------- ---------------- | | | | | | | audio pass thru | |-----------------------------|- Hide quoted text - - Show quoted text - I have a really simple, easy to check, theory: How does the grounding strip look from the negative terminal of your battery to the chassis? Just another little something you might want to check... ~Mister.Lull |
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