To get it down too 2 ohms you need to parallel 2 of your four speakers and run them off one channel and same for the other two as most 4 channels are only 2 ohm stable in 4 channel mode not bridged. Which means you have 2 channels un-used. Most 4 channels do the following:

4 x ? in 4 ohms
4 x ? in 2 ohms (This is where the 2 ohm stable comes into play.)
or
2 x ? in 4 ohms

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