So you want to use a room correction system? One of the questions you will face is how to implement it within your system. There are five different ways to do this:
Between a digital source (disc player or music server) and a digital analog converter (DAC). A room correction device used in this capacity must have digital inputs and outputs.
On a music server. In this case room correction software resides on your PC or Mac and implements the correction filter before the signal is output to an external DAC.
Using an external room correction box that takes an inputted digital signal, applies correction filters and performs a digital to analog conversion. The DEQX HDP-3 and HDP-Express work in this manner.
Similar to above but taking an analog input signal but performing an analog to digital conversion before application of correction filters and digital to analog conversion. The DEQX HDP-3 and HDP-Express both have capability to take analog inputs.
A room correction device that operates only in the analog domain using op-amps and therefore has analog inputs and analog outputs.