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RE: 26 preamp

High pass frequency will depend on the input impedance of HF power amplifier. It can be determined using an online RC calculator.
Active crossovers are used to eliminate passive speaker crossovers. If a standard two-way speaker is used in an active crossover system, its own crossover should be gutted; woofer and tweeter should be then directly connected to outputs of their respective power amplifiers. This is called bi-amping.

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