Subwoofer Installation on left channel speaker level signal

[salcedo5]

Hi, 

I need some help. I installed a 4 channel amplifier. Front 2 channels are driving the front speakers. The 2 rear channels bridged will drive a 10" inch subwoofer. 

I tapped the left rear speaker signal and I'm using a Y RCA cable to give this one signal (left rear speaker) to the 2 rear channels to be bridged. This amplifier takes both high level and low level signals on the same RCA connectors.

Is this a proper way to do this? 

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