balanced, subsonic, 24dB/oct filter anywhere?

Hi,

I'm looking for a balanced input, 24dB/oct infrabass (cca. 20Hz) HP filter to protect the vented subwoofer under the operation freq.

Is there any available to buy somewhere?

Or a schematic to start with?
I found some subsonic filters, and LR filters or balanced ones, but NONE that have ALL, in one solution.

Passive or active, no problem.
Thanks for any advise
 
Do you need a balanced output as well? If not, the filter circuit does not really need to have a balanced input,
just a compatible connector for your cable. If you need an XLR input socket, but not a balanced output,
you can just use one phase of the balanced input signal, and a single ended filter circuit.

For such a high order filter, it would have to be active. This obsolete one seems to be what you want.
Maybe a schematic is available.
PP IA18 A-series input amplifier & 24 dB/octave HP-filter module.
 
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