The manual is rather sparse, but as near as I can tell there is no defeat for the rumble filter- with so many ported systems these days, I suppose that's wise.
The built in low pass filter is 24 dB/octave nominal, but it does seem to cut some corners in the DSP processing area and levels out somewhat beyond -40 dB attenuation; I confirmed that measuring into a resistive load with voltage divider.
The built in low pass filter is 24 dB/octave nominal, but it does seem to cut some corners in the DSP processing area and levels out somewhat beyond -40 dB attenuation; I confirmed that measuring into a resistive load with voltage divider.
The manual states it's a 18dB/octave low pass, so thank you for giving some feedback on this unit.
The thing about rumber filters is that whilst it's a good idea for ported systems, for sealed systems it's a drawback. You'd want flat or increasing response in the low end, something similar to Linkwitz Transform. The trend I see is towards stuffing bigger drivers into smaller sealed boxes. Which I creates a whole set of new challenges, but if there's one thing the commercial manufacturers have over DIY is that they have plate amps carefully tuned to their woofer/cabinet system, with built in limiters etc.
I'm not sure if the LP crossover in the DS 4.0 is managed digitally, or analogue. Strange, about that -40dB floor
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