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Originally Posted by kaigoss69
One MAJOR drawback of the H660 (and the 650) is the front low/hi crossover, which can not be set lower than 200Hz, and the slope is fixed 12dB/oct. If you cross the underseats that high, you would probably want a steeper slope.
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Only applies to 'Front 1' which is 200 Hz to 5 kHz, the slope is 12 dB/octave. Fixed as HP tweeter output on bi-amp.
'Front 2' (which is the one alpine recommends to use) is a bi-amp output, which is HPF: 200 Hz to 5 kHz, LPF: 40 Hz to 200 Hz, both 12 dB/octav.
On sub output LPF is 40Hz to 200Hz 12 or 24 dB/octav
The H650 goes as low as 50Hz in bi-amp, rear and sub. So as far as I can see it should be more then fine...