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    I'm considering using Bona Fide buffers between a volume controlled preamp output of a vacuum tube integrated amplifier to drive the line level input of powered subwoofers which have an input impedance of only 20K ohms.  The output from the vacuum tube amp is going off the wiper tap of a 100k ohm stepped attenuator and should only see an input impedance of at least 1 M ohm.  The amps in the subwoofer are dc coupled and therefore I am concerned about the low frequecy response / roll off of the Bona Fide buffer.  I was unable to find any specification or discussion of the low frequency response.  Does anybody have that information or experience with using the Bona Fide buffer in a similar application?

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