Sloped baffle

Getting back to the original question concerning sloped baffles and time alignment, Mofimadness commented:

"It is used to time align the drivers. Some manufacturers do this physically, (with the cabinet) and some do it electronically (in the crossover)."

No knowing a whole lot about speaker design, my guess is that it is more difficult and expensive to design and produce a speaker with a sloped baffle. Wouldn't that imply that there is some perceived advantage to doing so?

Maybe this is a subject for another discussion, but I was wondering if coaxial drivers (TAD, KEF, Tannoy) are more likely to be time and phase coherent?

Al, You are welcome. The U.S. distributor, based in Colorado, knows the DEQX unit inside and out, so service is absolutely not an issue.
Bifwynne, the input impedance is 30-40 K and the output impedance is about 100 ohm on each signal line. My line stage is also ARC (Reference 10). I have paired subwoofers in my system that receive signal from the DEQX. The only output from the ARC is directly to the DEQX. The DEQX handles everything after that.
Every once in a while I take the DEXQ out of the system to reassure myself that its truly transparent when in bypass mode, most recently last week. To my ears, despite the extra A/D and D/A conversion (analog source) it is transparent.

Regarding digital signal processing as it relates to these issues, this from the DEQX website:

"In addition to frequency-response errors DEQX’s biggest strength is restoring phase and time-domain coherence by delaying faster-arriving frequencies until slower-arriving frequencies catch up for a coherent Impulse-response. DEQX even corrects timing delays in frequency groups within the drivers themselves rather than just time-aligning one driver to the next."

Bombaywalla, I use the DEQX, and I can tell you its tranformative. Because it 'corrects' the drivers, it has a way of making different speakers sound more similar, which would no doubt be disturbing to some potential users. Also, it makes some recordings sound somewhat different than we are used to hearing them, which is something that also takes some getting used to.

Bifwynne, I'd say that the cost is substantial but fair. The vendor is located in Colorado, and he came to my home in Arizona for the calibration and installation. I don't know if there is a trial program. The DEQX corrects the room acoustics, and it also corrects the speaker, as outlined in my previous post. The unit resides between my conventional preamp and the amps, but it also has full preamp capabilities if needed. A less expensive option deletes the preamp functions.

Bifwynne, the DEQX unit that I have also has active crossover capability, although I do not use that feature. Unfortunately, the designer of my speakers had no interest in helping me to disengage the internal passive crossovers.

Bombaywalla, the DEQX is not plug and play. The correction requires separate measurements of the drivers and the room. Generating the appropriate corrections is not a trivial matter. For me, having the distributor come to my home to do the installation was the only way to go, but some do it themselves. Once a year or so, we will meet up in a remote session over the internet to remeasure and tweak the curves.

Levinskih01, the volume control is superb, although it does not have as many steps as my ARC preamp. One nice thing is that I can keep the ARC at its optimal volume level and do the volume adjustments with the DEXQ. For digital sources, I bypass the preamp. Although some tube richness is lost, I want to get the maximum resolution possible from the digital source. With an analogue source I slightly prefer having the tube preamp before the DEQX, but I don't consider it essential.