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Old 23rd January 2014, 05:19 PM   #1
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Default Analogue Crossover with 20hz Low Cut

Does such a thing exist ? I'm building a 10" reflex sub for a home cinema set-up I'm building up with biggest possible low end extension being the primary goal.

I've come up with something but I need a 20hz low cut filter on it, I know the Behringer Super-X Pro's have a 25hz low cut but that's not really enough. Was wandering if there was another analogue crossover with a 20hz low cut.

I'm rebuilding some JBL 8340 cinema speakers into square boxes for mid/highs.

Wanted a crossover with build in 20hz low cut to minimize connections etc.

Thanks in advance,

Myles
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Old 23rd January 2014, 05:33 PM   #2
tinitus is offline tinitus  Europe
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Thel in Germany have designed a new sub xo with a steep high pass filter, exactly for this reason ... the excursion problem related to the very low bass EQ with vented systems

edit
actually that is rubbish ... it is not a xo, but 'only' a adjustable high pass sub filter, but with integrated subbass EQ, which probably is the special trick (lowest cut frequency is 13hz)
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Old 23rd January 2014, 06:30 PM   #3
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Ahhhh, fair play !

I've been toying with the idea of getting a miniDSP if I'm honest !

With the excursion below 20hz going through the roof with my design, the 48db/octave slopes possible on the miniDSP will be greatly appreciated.

Myles
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Old 23rd January 2014, 06:34 PM   #4
tinitus is offline tinitus  Europe
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ok
we can change/widen your thread title ?
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Old 23rd January 2014, 06:44 PM   #5
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Would still like use an analogue crossover if there was one that does what I need it too.

There is a citronic crossover that has a 40hz low cut. Not seen another analogue crossover with a low cut on other than the Super-X Pro's as mentioned above.

Some people have mentioned modifying the low cut/HPF on the Behringer Super-X Pro 2310 but would rather something that's designed from a manufacturer with 20hz cut on it, rather than modifying one.

Myles
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Old 23rd January 2014, 07:53 PM   #6
sreten is offline sreten  United Kingdom
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Hi,

Its easy to modify any high pass filter down in frequency
by simply increasing the capacitors by a fixed ratio.

Another option is to use a peaking high bass filter with
an overdamped vented alignment to get the extension.
The high pass then does 2 jobs, EQ and roll-off.

To change Q you need to manipulate capacitor values
and ratio's for a typical maximally flat Butterworth filter.

rgds, sreten.
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Old 23rd January 2014, 11:48 PM   #7
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The Rane AC22 has a 20hz 18db Butterworth low cut filter.
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