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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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.
you may have to send it in or back to the company... being that its one side it could be a blown amp or perhaps a bad speaker on that side ..
hooking up two 6x9s and a sub in bridge mode you could have a wiring problem when i bridge an amp i go from positive of one side and negitive on the other to the same positive and negitive on the sub or box
+--------------------\ ` bridge =========== > SUB - --------------------/
This should work if channel 3 & 4 are bridged at 4 ohm.
channel 1 should be stable at 2ohm
channel 2 should be stable at 2 ohm
You can hook up the right side speakers together ( + with + and - with - ) . same thing with the left side. this will give you 2 ohm each channel. this will cause your amp to run hot (this might be tuff on the amp). It will give you right (2 speakers) and left ( 2 speakers ), no front and rear adjustement if you need to balance your sound. I think you should be better buying another amp for your sub and take your 4 channels for your 4 car speakers. this amp as a rca output that can feed the other amp ( sub amp ). it is possible to do it.
if you have dual voice coils connect on each seporate sub negative left channel to possative right channel of the subwoofer same to other sub then conect the left possative and the right neggative to your box power terminal same to other sub then conect the two sub outs on your box left speaker positive to your positive left channel bridge then conect left speaker negative to the right speaker possative then connect your right speaker negative to your right channel negative brigdeg to your amp is single coil hook the box its self up the same way to your amp i have two dual voice cooil 12" hooked up to the same amp that way and it rocks without the power protecter turning on
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