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Are you referring to something like this, using two different amps? It is a mono amp, meaning there's one amp in the box. "KAC-9105D also has a Dual Mono Drive connection that allows you to strap two KAC-9105D amps together to power a single subwoofer."Quoted fromhttp://www.kenwoodusa.com/Car_Entertainment/Amplifiers/KAC-9105D
Here's a link to a page out of the Yamaha Sound Reinforcement book. the top shows a stereo amp (1 box, two different amps inside) hooked up to drive two different speakers, which is known as 'stereo' mode.It then shows the two amps hooked to the opposite sides of the same speaker, which is known as 'bridge' mode.http://books57.net/ampOuts.gif
Have you tried your subs on another amp???? Or hook up a small speaker at low volume to the amp and see if it plays....If it doesnt, then the problem lies within your speaker output on your amp or your line out (rcas) on your stereo
As far as I know, your sound will drastically improve if you run them +- and +-. Connect the one speaker correctly (+-) and then with the music still playing, try swapping the wires on the other speaker around and see which sounds better + to + or + to -
Hope this helps
If you have an aftermarket stereo, the hook up is fairly simple. On your amp there should be a minimum of 5 terminals and an audio input. one is for remote which is connected to the blue wire on your stereo. Second is your ground which is your negative connection. it should be connected to the body of the car close to the frame. Third is your hotwire which is the positive lead, it should go straight to your battery. The fourth and fifth are speaker wires, you may have 2 or more of these that have + and - signs above or below them. When wiring the speakers make sure to match the positive and negative connections on the speakers. If your rewiring all of the door speakers to your new amp then the colors that you see once you have them out are the colors you route to the appropriate locations on your amp. If this is for a sub then you just the connect th positive terminal on the sub which is red to the + on the amp and the black terminal on the sub the the - location on the amp.
Lastley there should be an audio input that runs from your stereo to your amplifier. This wire should be ran as far away from the positive wire as possible to avoid engine noise coming through your speakers.
You can use either the high level (speaker) or the low-level (RCA's) inputs to the amp, but not both. Choose whichever one sounds the best or is more convenient to install and leave the other disconnected.
The only thing that hooks to the stereo are a remote cable should be labeles on the amp. and the rca cables (red and whites) the different channels go to different sets of speakers.right to right left to left. make sure your amp is grounded well or you'll throw the fuse. Hope this helps if you have questions contact me.
I often troubleshoot these issues via a stereo head set, modify the leads so you can "Touch" them onto the Speakers Output Terminals, connect the "Shields" together, thats "Earth" and the other Two, are Left & Right... with the Amp's volume turned to about 25% volume, connect up the Earth wires to the Chassis with a clip, under a srew etc, just make good contact... then touch the Left & right wires onto the output, ya should hear sound... if not most probably the Output device(s) may have gone faulty.