ORIGINAL: bitflipper
There is nothing wrong with the ARC approach, and it can in fact help despite the widely-held opinion that it is snake oil. (Ethan Winer has called ARC "a joke".)
You just have to be aware of its limitations.
I've read far more good things about ARC than bad. That's why I hesitantly, but now thankfully, took the plunge. My decision was based on all the views I read and finally my own choice. Considering that Ethan sells an expensive room treatment option, I'm not surprised that he thinks that the ARC system is "a joke".
It cannot "correct" a room. Its effect is only valid in the mix position, and in fact might make your output sound worse to listeners positioned elsewhere in the room.
It cannot compensate for a resonant null. No equalization scheme can. A null is a null is a null and it doesn't matter if you blast that frequency out at jet-engine volume, the null remains.
With the ARC system even though the "correction" is done for the listening position I found that anywhere in the room sounds better with ARC than not. For me, working on my own though, its only the listening position I need to improve. The same can be said about the DEQ2496 though, as I said already I don't think it does as good a job as ARC. Of course the hardware is more flexible as I can use it live as well as in the studio and it has extra features not found in the ARC system.
Doing the calibration measurements was a learning experience in itself as the system obviously is able to calibrate very fine changes in mic position. I took 14 samples within an ellipse only 1.4 meters at its widest. My listening position is at the apex of an equilateral triangle of 1.4 metre sides formed between the 2 speakers and the centre of my head.
You should not think of ARC as a substitute for acoustic treatments, but rather as a way to augment them, to reduce the worst resonant peaks that your traps cannot fully mitigate.
I recognize the value of room treatment (and said so in my first post) but I'm a long way off being able to do it. So in the mean time I'll be using ARC.
I'd like to add that if you're not willing to spend the money on ARC you can achieve the same result with an inexpensive outboard parametric equalizer such as the Behringer FBQ2496 and a little manual testing and tweaking. Not only will it cost less, since it's a hardware rather than a software solution you also avoid the CPU overhead.
I have a Behringer DEQ 2496 (many more features than the FBQ AUD$349) and it doesn't do as well with the room as the ARC does.
It cost me more than the ARC system did. Of course it has more features too.
DEQ2496 AUD$449 + Mic AUD$85
ARC AUD$384. inc Mic (US$307 inc free shipping@ ezounds IKM Crossgrade price)
I've had my DEQ for about 3 or 4 years now and use it for live work and external processing as it is a Graphic EQ, Parametric EQ, Compressor, Limiter, Expander, Feedback detection, as well as providing upto 24bit @ 96khz ADDA up to now doing some basic room eq and for reducing feedback, when I have a few folks playing live in my "studio" with mics.
I've now burnt a CD of a single song (before and after) in the soft Rock genre and all I can say is I'm happy I spent the money on the ARC. On my HiFi Audio system (with subwoofer) and in the car I now have what sounds like a well balanced mix.
Incidentally it will be interesting to find any differences introduced by use of the test microphone. One being a Behringer as recommended for use with the DEQ2496 and the other being the one shipped with the ARC system. Incidentally both mics are made in China and look almost identical??
OVERHEAD:
The overhead for ARC is negligible, and by that I mean that the CPU hit was maybe 1-2% on the SONAR CPU meter. (I'm running an Intel i7 920 with 6 GIG DDR3 RAM on VISTA x64) You only use 1 instance of it as the last plugin on the Master bus.
So far in testing, (just got it yesterday) I've only gone back to a previously completed song and put ARC across the Master bus. No remixing done at all. It will be interesting to set up a project with ARC on from beginning to end so that all sonic related decisions are made monitoring through ARC.
I'll reiterate that it was the most effective
SINGLE thing I have done for improved overall sound. Its another tool. There's so much subjectivity in evaluating what amounts to good quality sound. One man's improved sound apparently is another man's snake oil.