Assertion: subwoofer | /r/HasProperty | upper frequencies
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text: If you have a preamp (in your case, your mixer) that has an electronic crossover in it, then using that to send the signal directly to both the power amplifier and the subwoofer (upper frequencies to main amplifier, lower to subwoofer, obviously) is likely the best approach, assuming that you want to not send the full range signal to your main speakers (which, if you need a subwoofer, you probably do not want to send the full range signal to the main speakers).