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If by saying amp outputs you are refering to the RCA jacks on back of the head unit (Left and Right RCA jacks usually labeled FRONT, REAR, SUB, etc...) then you do have options even if your head unit doesn't provide a SUB channel. These RCA jacks/amp outputs carry the signal (music or whatever) at a lower voltage (and is typically more like DC voltage as there is a ground reference which is 0 volts and signal rides on the positive voltage), providing a cleaner signal to the amp which does all the work. The wires behind the amp that you connect directly to the speakers is typically amplified by the head unit itself and is a much higher voltage level and varies from negative to positive ( AC voltage.).
You could use the other channels (FRONT or REAR) if available, (a specific SUB amp output cuts all the higher frequencies out, passing just the lower subwofer frequencies inside the head unit).
if you want to strive for a more efficient use of your sub, use a low-pass/SUBwoffer filter (a crossover) in between the Head unit and amp, thus providing the amp with subwoffer signal, (or if for some odd reason you have SPEAKER level sub connections you can use a line output converter which will let you run RCA to the amp.)
Hope this helps u understand why I couldn't just say get a new stereo nor could I just say use splitters on available amp outs.
you are better off setting your deck speakers amp to a high pass filter setting on the amp. Adjust gains to increase desired bass and clarity. Turn off loud button if you have one, that will distort your deck speakers.
This one Wire should be for the +. Try connecting the + to the Head Unit and - to a Common Ground. At the Worst, You will Blow the Amp Fuse if not Correct. The Lead from the Head Unit is Only an Off and On from the Ignition. Please Rate My Response! Thanks!
It is what Turbo911 stated. If you switch the solid blue wire (powere antenna) with the blue&white wire (power control) this will solve the issue. The blue wire is made to power an antenna in which is only used when on FM source. When this is connected to amps, it will shut off your amp as soon as you leave FM radio
lol i had the exact problem that you are having with my alpine. The solution is taking the blue cord that was inside the vehicle (forgot what cord it was) and actually connecting it with the other blue cord thats different makes the factory amp read the cd player and ta-da it works. crazy isn't it
There should be some sort of outboard amplifier. Mine had an amp at each speaker, and also a receiver mounted behind the passenger seat. Could it be that the power antenna lead from your headunit is connected to the amp turn-on lead? That way, when the radio is playing, the antenna lead is powered and thus the amps are too, whereas when the CD is playing, the antenna lead would not be powered and thus no sound.
Try reversing these two wires (Power antenna and amplifier turn-on)
and your CD should work.