Using two amplifiers in a DJ set-up can be useful if you want to reinforce your sound throughout larger venues or set up speakers projecting in different directions. The most common use is to send the same signal to multiple outputs and split the frequency spectrum so that one amplifier powers mid-high speakers and the second amplifier powers subwoofers. Remember to never plug the output of one amplifier into the input of another. You could damage your speakers and amplifiers and possibly injure yourself or others through electrocution or explosion of components.
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Things you need
- DJ equipment
- XLR, Neutrik or 1/4-inch speaker cables
- Multiple output EQ or crossover
Take the left output from the DJ mixer or house mixer and connect it to the first channel of amplifier one. Connect the right output of the mixer to the first channel of amplifier two.
Set each amplifier to "bridge" mode. This is usually found as a switch on the back of the amplifier near the input connection. Bridge mode will send a mono signal to as many speakers as match the amplifier's impedance.
Connect amplifier one's outputs to a set of speakers. Connect amplifier two's outputs to a separate set of speakers.
Ensure that the added impedance of your speakers (4, 8, or 16 Ohms) does not exceed the maximum impedance for the amplifier.
Connect the left and right outputs of the mixer into the inputs of your crossover or equaliser.
Set your crossover or equaliser outputs so that the first two outputs are set to the mid- and high-range frequencies. The exact frequency crossover is up to the preference of the sound engineer, though it is generally in the 160Hz to 440Hz range for a DJ sound system.
Set a third output to the lower frequencies–generally anything below 440Hz to 640Hz.
Connect the first and second output of the crossover/EQ to the two inputs on the first amplifier. Connect the amplifier outputs to the left and right main mid-high speakers.
Connect the third output of the crossover/EQ to the first input on the second amplifier. Set this amplifier to bridge mode.
Connect the second amplifier to your subwoofers.
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