DEQX

From DRC

I work at DEQX. As none of our customers have added any feedback to this discussion yet, I hope you'll allow me to offer what I hope will be a few enlightening comments.

The DEQX PDC-2.6 and PDC-2.6P are different to any other products because the DEQX process can include three very distinct stages to create the final correction filters:

1. Measure and correct the loudspeaker drivers 2. Add a digital linear phase crossover (not just a digital version of a traditional analog crossover). Very steep slopes are now possible, eg 100 dB/octave or even 300 dB/octave 3. measure and correct room problems.

That is, the DEQX process deals with getting the drivers right first, then perhaps adding the high order linear phase crossovers (at any suitable frequency - you can experiment with different crossover points). This can virtually eliminate driver distortion and really improves the power handling. THEN look at the room. Not much point in using wonderful DSP power for the room, and forgetting the part that excites the room.

The room becomes less of an issue if the speaker is operating optimally. Most speakers' "off-axis" response is poor even if the "on-axis" (ie. sweet spot) response is exceptionally good. So the sound changes tonal character when you stand, sit or move around the room. One of the most noticeable things that happens when the DEQX is introduced into a loudspeaker system is dramatic improvement to the off-axis response. The soundstage really opens out, sometimes you can even walk behind the speaker and the sound is amazing.

There's a good article by Vance Dickason in Voicecoil magazine. He says "...I've reviewed alot of software over the years for Voice Coil, and the DEQX software ranks among the very best...You go from initializing the software to a complete crossover design so fast, you'll be wondering whether you did something wrong, but you didn't."

Carrie cgrimes@deqx.com

Get more info here: http://www.deqx.com/

http://www.deqx.com/images/product/PDC-Preamp-lowres%20.jpg