Originally Posted by
doctordata
I build a K140 sub with one driver in a 57 litres ported box , tuned to 20 Hz combined with a electronic filter as published in "Luidsprekers fabels en feiten"
( That's Dutch for "loudspeakers Myths and facts" ) ISBN 90-70160-46-3 The electronic filter contains only three Op-Amps , 9 resistors and one capacitor and is based on the patented "ACE" principle by K.E.Stahl . I use the system for 4 years now, combined with a 150W RMS amp module in my Denon and Tannoy Home theatre and I'm still impressed with the stunning performance of this combinaton , down to 20 Hz - 3dB and loud enough for my 10 x 6 metres living room .
Happy converting ,
Cheers ,
Rens
Brisbane