Yes, you can only bridge most 4 channel amps into 2. If you have a dual 4 or even 8ohm subwoofer it is possible, just bridge 2channels onto each voice coil.
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2013 Kia Rio -90a alternator
DDX470HD GTO14001 GTO1014D (x3)
Big3 in 1/0G
1/0G to GTO14001
If your goal is to use your entire amp on one woofer. You would need a Dual Voice Coil woofer. You could then bridge shannels 1 and 2 to one voice coil. Then bridge 3 and 4 to the other coil.
troyt. wrote:
If you cant what is the explaination on why.
Because to bridge an amplifier, you invert electrically (or reverse) the phase of one of the channels to provide twice the voltage and allow (in theory) twice the current across one, given load. Since there is only positive and negative - two positions - for a maximum and minimum voltage swing, you cannot bridge 4 channels. There would have to be 4 ways to swing the voltage. THAT is why you cannot bridge 4 channels.
Twice the voltage times twice the current equals 4 times the power, which is why you see higher quality amplifiers actually MAKING 4 times their single channel rated power, i.e. the classic Orion reds (the HCCA amps) were 100 watts bridged into 4 ohms, but only 25 watts per channel, in stereo mode into 4 ohms. These are examples of true high CURRENT amplifiers. The power supply tries to maintain the output voltage, no matter what the load attached, by increasing it's current output.
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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."