Originally Posted by Thxtheater
A slight correction re: Anthem's ARC. You can take advantage of ARC with any Anthem pre-pro or receiver. It's not limited solely to the more expensive units. Anthem's ARC room correction is available on all their receivers and pre-pros. The pre-pros (D2v and 50v) have the "full version" of ARC that can correct up to any frequency. The receivers have a more limited version of ARC that can only correct up to 5000kHz if I recall correctly. The default setting—even on the more expensive pre-pros is for ARC to correct only up to 5000kHz. The receivers that were just announced at CEDIA now allow you to run ARC via an Ethernet network as opposed to via serial only.
That's not a limit, really. It's a feature. More importantly, all versions of ARC (including the implementation on the old MRX '00 AVRs) allow one to lower
the top setting down as low as one wants. So one can use it the way room correction should
be used: to fix modal region and bass loading issues caused by speaker placement, while not mucking with the direct field response of the speakers in the mids and highs. (I use ARC up to 500 or 550Hz, I think, in my current setup.)
Note that the audio-focused correction systems (Meridian's, Antimode, etc.) all stop touching the signal above the upper bass/lower mids. (Or they start with knowledge of the direct field performance, such as in the JBL Synthesis systems or the Genelec speakers.) The movie-focused ones generally go wideband, because fidelity of the mids and highs is less important there.
Originally Posted by comfynumb
That's kind of what I meant. My meaning was the version on the lower end models were a watered down version. Other manufacturers do the same thing with Audyssey. We can hear much higher than 5000khz, more like 16000khz for an adult. So why is the correction only to 5000khz?
Because wideband correction based on listening position (or listening "zone") measurements is a generally a bad idea. Mikes don't hear the way ears do, and can't discriminate first arrival from early reflections. For wideband correction to be done right, the system would need to know how the speakers perform in the direct field, either based on lab measurements (a la JBL Synthesis) or in-situ gated nearfield measurements (I think the HK990 may have worked in this way.).