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Use a Phonic crossover to get the most out of your amplifier. Separating the low and high frequencyes - and even the low- and high-mids - from your audio can allow you to amplify only those signals and vastly improves the amount of power you can get out to your speakers. Whether you're using a subwoofer and only need your low frequencies, or if you've got a 3- or 4-way speaker and want to independently amplify your signals, the various Phonic crossovers can help you achieve optimum separation.