Audiophile music sub for small speakers

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Hi all

I use a pair of audiophysic steps as my main loudspeakers. Love the resolution and imaging.
I would like to try my hand at building a decent small tight fast subwoofer to use with them.
Probably a passive design with a DVC drive unit. Perhaps in a box of approximately .35*.35*.35 m or so.

The speaker specs are:
Power rating : 10 - 60 watts
Impedance : 4 ohms
Frequency range : 60 Hz - 25 kHz (-3dB)
Sensitivity : 84 dB / 1 W (1m)

I know, by the time they get going they are about to run out of power capacity.... But I love em, like many love those Quad ESL57s.

Where do I start?
 
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