Bridging deck amp for front speakers

Hey i just stumbled upon this site when i was looking for an answer to this question.

I have 2 amps running my subs and rear speakers in my Legend. they sound great, but my front speakers are weak now, because theyre running off the deck power. So my question is this, is it wise to bridge a deck amp (taking the positive from the front left output, the negitive from the rear left output, and connecting it to one speaker in the front) to gain more power? I realize ill be running at 2 ohms, so would that be a problem for my 4 ohm pioneers in front? I checked the wiring diagram and it shows that in a 2 speaker system you still only hook up to the front channel, but that seems liek a waste. am i missing something here?

The amplifiers built into head units are not bridgeable and they will not even recognize/acknowledge a bridged connection.  Usually the internal amplifier is split up into the two front output channels, and the two rear output channels.  Each pair is completely independent of the other one, and thus it would never even give you any sound output if you tried to bridge them.

It may possibly give you sound if you were talking about combining the front left positive and the front right negative outputs, to power a single speaker.  However, even if it gave you sound, it'd fry the radio pretty quickly because they're just not made to be bridged.

It would not be a 2-ohm load because you still only have one speaker hooked up.  A lot of head units actually can handle a 2-ohm STEREO load, which is basically just hooking up two 4-ohm speakers to a single speaker output.  So technically you can run like 6 or sometimes even 8 speakers total.  But none of them can be bridged because like I said before the head unit won't be able to sense when a bridged connection exists.