7.2 surround sound uses dual subwoofers; usually it is only a 7.1 with only 1 subwoofer. If you have a 7.1 receiver then a simple “Y” cable will allow you to connect 2 powered subwoofers. True 7.2 surround is actually two different LFR (low frequency effects) with a left and a right channel. Using a “Y” cable would not give you true 7.2, but would in fact remain a 7.1 with 2 subwoofers.
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