When a conventional speaker is fed with a signal, its drivers radiate sound into a room to be heard by a listener. But much more is happening in this transaction.

Here's the full kit as you would receive it from VAF, including enclosure, drivers, crossovers and the all important foam pieces. (OK, it's half the kit - for one enclosure. Sorry!). Each of the items is detailed in the parts list.

Energy is continually being stored and released by various resonances within the speaker system or between its key elements.

Consider a conventional speaker. Sound radiates from the front of the driver and is heard by the listener. Sound also radiates from the rear of the driver into the cabinet.

This rear energy is reflected off the internal surfaces of the cabinet back to the driver and some of it will be transmitted through the driver’s cone to be heard by the listener a moment after the original sound. Further reflections inside the cabinet will occur until all the energy is dissipated.

This stored energy is released at many different moments in time after the original (direct) sound has projected from the drivers’ diaphragms.

So in reality a conventional speaker system’s output is a blend of direct and delayed signals.

A conventional crossover network can tailor the system’s output but cannot significantly compensate for Stored Energy.

In the original VAF DC-X loudspeaker, the rear energy from the drivers was directed into a long tapered lossy transmission line to dissipate it, eliminating any need for compensation.