I have two rca input jacks on the amp for left/right...though there is only 1 rca output on my head unit... i want to amplify 2 180watt speakers, and 1 400watt sub... though each channel is asking for a rca input.. how would i use one rca input for both channels...is there a adapter for this???
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Re: 3/4 channel sony amp
Yep! It's called a Y-Splitter. They make different variations of them:
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Just to the left of the output (speaker) terminals, near the top of the amp, there's an LED marked "POWER/PROTECTOR". If the amp is connected properly and powered on, the LED is ON.
If the amp is being used for normal speakers, use a pair of RCA cables and connect the left/right channels to the appropriate inputs on the amp. The switch marked "LPF" should be "OFF".
If the amp is being used with the channels bridged for a subwoofer, use an RCA "Y" adapter and connect the single "Sub Out" preamp output from the head unit to both amp inputs. The switch marked "LPF" should be "ON" and the crossover set to about 80-100Hz.
I have a similar setup & I just run the second amp straight off the other amp by running positive & remote wires directly from 1 amps positive & remote inputs to the others amps inputs. But my head unit has RCA inputs, (sub in & front & rear inputs) so from my 4 channel amp I run 2 6 inch alpine S's to the front to the front RCA inputs of the head unit, & 2 Pioneer 440w 6x9 inch speakers to the rear inputs. & my 800w 12 inch sub from my 2 channel amp to the sub woofer inputs on the head unit. Has blown my eardrums for nearly 12 months now great stuff!
Hope this has helped
YOUR METHOD OF TROUBLESHOOTING USING THE PROCESS OF ELIMINATION IS RIGHT ON AND PERFECT. IT INDICATES A BAD AMPLIFIER CHANNEL. I KNOW THIS SOUNDS ODD, AS YOU HAVE TWO OF THESE NOW. IT IS RARE, BUT I HAVE SEEN INPUT CONFIGURATION SWITCHES WIRED BACKWARDS, SO THE ONLY THING LEFT TO DO IS TO HOOK UP THE BAD CHANNEL TO ONE SPEAKER ONLY, BY ITSELF. THEN TAKE ONE RCA ONLY AND PLUG IT INTO ONE RCA INPUT AT A TIME. THEN MOVE THE INPUT SWITCHES AND REPEAT THIS PROCEDURE UNTIL YOU HAVE TRIED ALL SWITCH COMBINATIONS AND ALL INPUT JACKS. WHAT YOU ARE TRYING TO DO AT THIS POINT IS TO DETERMINE IF THERE IS ANY RCA JACK WITH ANY SWITCH POSITION, THAT WILL ALLOW YOU TO GET OUTPUT FROM THAT CHANNEL. IF AFTER THIS TEST, YOU STILL HAVE NO OUTPUT, THEN NO MATTER HOW ODD, IT WOULD INDICATE THAT YOU DO IN FACT HAVE A SECOND DEFECTIVE AMPLIFIER. LET ME KNOW IF YOU NEED FURTHER ASSISTANCE.....V
It sounds like there is a difference in the signal levels on the inputs to the amps. You did not specify what the RCA's are connected to on the head unit side. If they are connected to a stereo pair of preamp outputs, you may be able to solve the problem by using only the channel with the higher signal and use an RCA "Y" adapter to split it to both amps. If they are connected to a dedicated subwoofer output on the head unit, make sure that the head unit is set for "subwoofer". Some less expensive head units, I know JVC in particular, has only 1 set of line outputs and requires you to go into their "PSM" (Preferred Setting Mode) to set the line output mode and if you select "subwoofer", then allows you to select the low pass frequency.
If you are converting speaker-level outputs through a "line out converter", check both the input and output levels.
Also, if you are splitting an output from the head unit, you still need to connect 2 RCA's to the amp inputs. The signal will be properly split if you use a 1-female to 2-male "Y" adapter. To feed the same signal to both amps, you would need 3 "Y" adapters. Feed the output signal to the female end of the first "Y", and plug the male ends into the other 2 "Y" adapters. Then, the 4 plugs you have left on the ends go into your amp inputs.
Cables are either shorted, or deck is putting out too much power for input on amp... many new head-units will put out up to 7v on the output jacks (RCA) the amp may only want to see up to 1v will need to consult head-unit manual for adjustment of outputs.
First off, if you're using RCA preamp connections from the head unit to the amp, you don't need to put anything into the high level input connector. But if your head unit doesn't have RCA preamp outputs, then connect the front left to the white (+) and white/black stripped (-) wires and the front right to the grey (+) and grey/black stripped (-) wires. There is no need to connect the rear speaker outputs of the head unit to the high level input of the amp.
Unless your amp is 1 (one) ohm stable then you may have fried it. When you attach a 2 ohm load across a bridged amp then you have effectivly placed each output channel on a 1 ohm load. Not a good thing in most cases. Try hooking up ONE speaker on one channel and one input to that one channel one at a time. Then switch the speaker/input to the other channel and see if you can get either or both channels to work independently. Needless to say you must turn the amp off before you make ANY change in the wiring.