Out of band filters in speaker DSP presets

Michael John

Michael John

Junior
Jun 25, 2011
352
9
18
Sydney, Australia
eclipseaudio.com
Hi,

I've been looking over 3-way DSP presets for some high end touring products and occasionally I notice odd out-of-band filters. For example in one preset, the mid range channel has a narrow boost of about 6 dB at a frequency that's at least 1 octave lower than the low-mid crossover frequency and where its high-pass filter is at least 20 dB down. (I could understand a cut, to reduce a resonance, but not a boost.)

Can anyone explain why there might be narrow out-of-band parametric filters? Boost or cut.

Cheers,
Michael
 
Re: Out of band filters in speaker DSP presets

Michael,

Whenever I build a loudspeaker preset I always measure the raw driver response first and flatten it as much as possible, even several octaves out of band. This makes building crossovers a lot easier. However, I don't know that I've ever used a boost... I do make some EQ corrections to try and make the drivers sound good at this point, so perhaps this is what they are doing.
 
Re: Out of band filters in speaker DSP presets

Bennett Prescott said:
Michael,

Whenever I build a loudspeaker preset I always measure the raw driver response first and flatten it as much as possible, even several octaves out of band. This makes building crossovers a lot easier. However, I don't know that I've ever used a boost... I do make some EQ corrections to try and make the drivers sound good at this point, so perhaps this is what they are doing.
Click to expand...

Thanks very much. Makes sense.
 
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