DeeringAmps
I ran Mikes test tones (thanks for that Mike!).
Below are the results:

The results look pretty similar to the Pink Noise. The "brighter" line is the ARC corrected capture.
I think I had the 10k roll off engaged on ARC, I usually mix that way the A7's are pretty "bright".
I guess we need the "pretty waterfall" software!
 
T

my ears must be fried....   but I use Harbal also for various things and the difference I'm seeing here, would basically almost be inaudible to me.  Very minor.  What am I missing in this thread, that to me appears to be very minor adjustments -  to the point of not much difference?  Yes, the ear can hear 1dB change or so, but those graphs look almost identical.  Certainly MUCH less than what I might adjust using Harbal.   Interesting the drop off at 25Htz like that...and then back UP.  You're getting some pretty low freq response there too, on playback.  That's good.  Solid down to 30 Htz

mike_mccue
 
 
I often wonder why folks don't just buy an Audyssey MultEQ equipped receiver from one of the big name manufacturers and stop messing around with routing stuff through VSTs.
 
:-)
 
http://www.audyssey.com/solutions/home-theater

 
Mike I am with you on this. I don't use ARC because I don't believe I need it.  I am hearing things pretty nice here without it.  Also I don't like the VST concept either.  KRK make a hardware based system and that would be the only way I would do it. In between the mixer monitor outs and the active monitors.
 
http://www.krksys.com/krk-ergo.html
 
I am not sure if it is running the same system as the ARC though.

Hi Tom,
 I think you have posted some interesting results. The use of the frequency sweep should negate any concern that the variety of levels found in an instantaneous sample of pink noise may have contributed to the wiggly response displayed by Har-Bal.
 
 Having said that, it's interesting to note how the results from a sweep are so similar to the results from the pink noise analysis. I guess that's why pink noise seems to work so well in practice. :-)
 
 The peaks and nulls you see when you use the sweep are a good representation of the room modes as, unlike pink noise each frequency is presented in sequence and at a predictable time and a predictable amplitude. There is no need to second guess how an "average" value for pink noise was established.
 
 It would be very interesting to see detailed waterfall graphs of the sweeps and to see if a characteristic such as RT60 would appear different with and without ARC. I am assuming that it would be much easier to see the differences with the sweep than with the pink noise as the pink noise analysis would include the seemingly random movement of the noise itself.
 
I suspect that my use of some terms is too generalized or perhaps even misplaced. I'm hoping drew, Bit, or Bill will stop by and fact check my comments! :-) :-)
 
 Thanks for making the tests!

double post.