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Is it possible that there are two different crossovers set up? Perhaps something else going on?
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Of course. Most systems use a 2nd order HPF (x5) and a 4th order LPF. This then accounts for the 2nd order roll off of the mains to result in an effective 4th order.
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Any suggestions are welcome
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My feeling is that most receivers/processors will be perfect in their crossover execution and will have a flat line out to 20KHz without fail (your green line). The differences we're most interested in would be the low end response effect on our subwoofers. This is where you would find differences between products. I would rather see the graphs from 2Hz to 200Hz (or at least that in addition to what you're requesting), to better examine the drop below 20Hz. Certainly all the
crazies aficionados of bass down to 5Hz would be extremely interested in the constraint their equipment is placing on the final sound.
sp2 sub with adc dac.jpg
brucek