Sub low pass filter
I have a subwoofer specially designed for 15-25Hz (Visaton TL-SUB). Front speakers are full range Visaton Casablanca. Problem with all surround receiver-amps is, that the subwoofer cross over frequency is 40Hz as lowest choice. So what I like to develop is an active cross over with a stereo and mono subwoofer output with cross over frequency adjustable between 20 and 30 Hz.
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