I would do a volt test one the channel that works, then take the volt on the one that is blown and compare if voltage is lower or none at all you could have burned up a wire or a circuit inside of the amp.
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If you remove the signal cable from the amplifier while the Sub is switched on (turned down about half way) you should hear a thump sound. If you do that proves that your sub is working and you need to look at your Yamaha. Perhaps the sub channel has been disabled in the logic settings. Check the speaker configuration pages. If all looks well reset your amp to factory settings and try again. I have had a logic glitch which was fixed in this way.
The sub speaker is normally connected to a sub outlet on the amp because the sub circuit outlet is designed for low frequency sound output.. I would not connect the sub speaker as it will affect the left and right channel sound of the left and right speakers.
Have you checked the final transistors on that weak channel? They may look fine but may be weak. You can pull them and check them on your multimeter with the diode check and cross it with the data sheet for that transistor.
havent heard of too many 14" speakers... but it all depends on what ohm the speaker is. single 4 ohm- bridge it on one set of channels. left + right- . if its a dual 4 ohm i wouldnt reccomend using it at all. you could technically bridge each coil on each set of channels. but it may not sound right. kinda hard to set the gains and match them. dual 2 ohm- run the sub stereo. one coil to one channel, the other coil to the other channel. single 2 ohm. dont use it unless you get another sub like what you have. then run it stereo. one sub to one channel. the other sub to the other channel.
try reconnecting your rca's from the deck to the amp when finished wire one speaker positive to positive on left channel and negative to negative on right channel then connect the 1st subwoofer. if all power and sound is fine and working turn off power to amp and connect negative terminal of 1st sub to positive on 2nd sub and positive from first sub to negative on second crossing the wires runs the speakers in series another way to try is parralel the speakers wiring by connecting positive left channel output of amp to positive on 1st sub same with the negative then splice positive to positive on second sub and same with negative.
This means you have a dual voice coil sub. It is probably a dual 4 ohm voice coil. If you hook up the left channel to one input and the right to the other you can safely push the sub but the amp will be running at a lower efficency. In other words it isn't the best amp for the job because it can't push max power to a dual voice coil speaker but it will work.
try hooking up your subwoofers in series. then connecting them bridged to the amplifier. as follows: positive from sub#1 into positive of amplifier left channel.. negative sub#1 into positive sub#2. negative sub#2 into negative amplifier right channel. turn the gain down as this will sound pretty loud.
You can plug into the left channel and it will feed both the left and right channels.
To confirm that it's feeding both channels, connect the speaker to one channel at a time. With signal fed into the left channel only, you should get sound when you connect the speaker to either channel.
I'm not understanding what you mean by the "Sub doesn't even sound blown" if it doesn't play at all. One thing you can check is if you gently push in on the cone you shouldn't hear anything, if you hear a scratching noise and can feel resistance then you have a problem. If you have an OHM meter, you can check the voice coil impedance, it is a down and dirty way of checking to see if it is good or not. Measure all of the voice coils that you have and they should all read about the same, not necessarily exactly the same but pretty close. This test should tell you a lot. If it seems to test out fine there is something wrong else where. Let me know if you need more help. -Andrew Hawkins
The unique Dual Voice-Coil design allows both left and right channel
sound from just one speaker. Simply hook up both the left and the right
channels to the special terminals on the speaker. Hook up one channel
only, if the speaker is to be used in a conventional stereo set-up. I found this on jamo site hope that will help you