Take out the connection between the pre-out and main in and buy yourself a Y adaptor. Take a set of interconnects and re-connect the pre-out and main in and now your left with a set of pre-outs for the sub.
The other method is by speaker line connections on the sub (if your sub has them). Hook up your speaker wires to the speaker input connections on the sub, then wire from the speaker output connections on the sub to your speakers and set the crossover appropriately.
coonass06
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how do you wire two 4 ohm subwoofers with dual voice coil into a mono amp and make it at 2 ohms
You can also connect crossover from Jamo to the speaker outputs on amp and speakers to crossover. In the middle you have rca sub pre out. Have a nice Day