As promised here is a picture of my subwoofer. I have pushed a settee
out of the way so it can be seen, and also removed a white cloth
screen that normally covers it. So in use it is totally invisible.

http://www.donepearce.plus.com/odds/sub.jpg

The driver is a 15 inch Adire Tempest mounted in an 80 cubic foot
concrete cupboard, which extends under a staircase on the other side
of the wall. The mounting board, which replaces the cupboard door, is
18mm MDF, braced extensively with scaffolding board, screwed and glued
edgewise onto it. It is very solid.

The whole thing tunes pretty nicely with the room to make an almost
flat response down to something very low indeed. At the top end, it
merges and integrates very nicely with the Sonus Fabers, which take
over from about 60Hz.

Last night's Bach was as much a visceral as an auditory experience.

d

Pearce Consulting
http://www.pearce.uk.com