When we interface with a factory car audio system we often times face challenges to use the factory signal for an aftermarket speaker system. There might be equalization we need to correct, or channel summing may be required to achieve a full range signal. But another challenge in today's latest vehicles is All-Pass Filters. What is an All Pass Filter? Why do the OEM's use all pass filters and how do we correct for them with a DSP? Should we? Can they be used to create a two seat tune? Let's learn about all pass filters and their use in car audio!

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