I have build 4 columns for my back 7.1 surround system. (1 shown in pic. below) Last night I was playing around with some CD's in the room and noticed that when I suddenly stop any song my rear surround speakers would decay at a very slow rate. I do not have any way of measuring it but I can...

A few months ago, I made two three ways active Columns comprising each: one Atohm D300-P04 for the low frequencies, two Dynaudio 20W75 8 Ohms for medium freq and one Dynaudio D260 for highs. The enclosure is filtered and amplified by Digmoda DDC552. The project was born from the will to...