Originally Posted by xtrips
After having had some misadventures lately where my D2 maybe was the cause (one mid-woofer coil burn and one tweeter seriously damaged) I am now back on track with almost brand new speakers.
So I ran ARC again but this time I made some modifications to the targets defined by ARC:
- For movie:
I used all my 7.1 speakers
Changed target freq from 5000 to 12000
Left the crossover points and gain as is
- For music:
I used only 2.1 speakers
Changed target freq from 5000 to 20000
Changed my L/R speaker cross point from 50 to 25
Changed my sub cross point from 120 to 60
Changed my gain from +0.000 (?????) to what was calculated for movie
Then I calculated and uploaded. I attached screenshots.
It sounds good.
What do you think of the procedure and settings?
Why do you think ARC set a value of +0.000 gain for music? To me it looks like a bug as I think that gain is room dependant and should be the same for both profile.
Your Movie results look OK to me. It looks like you've got a pretty severe room null around 30 Hz (affecting all speakers), and that's left a residual between 20Hz and 30Hz in your subwoofer. Adjusting room treatments might help with that (or some minor repositioning of the subwoofer), but ARC has tamed most of it and you might want to just leave well enough alone.
Now your Measured curves for LF/RF don't show any Room Gain that I can pick up by eye, so it appears ARC has detected the Room Gain by relying on the center, side and rear curves.
But you aren't using any of those speakers in your Music configuration and so ARC doesn't see the results from them.
All 3 of the Measured curves for Music look much worse in bass than the same speakers for Movie. Did you use different mic locations for Music compared to Movie? Are your mic positions properly spread apart?
I can see based on these Measured curves why ARC didn't find a Room Gain. The curves make it look like you've got NEGATIVE Room Gain. Adjusting the Room Gain to match what Movie found was probably wise.
However the bad Calculated curves you've got are probably a result of pushing the crossovers down too close to that severe room Null you've got at 30Hz -- as well as forcing ARC to divert too much of its attention to the high frequencies.
So I think there may have been a problem in the way you took the Measurements for the Music pass, and I think you should NOT push the Max EQ Frequency up so far for Music, and I think you should NOT try to lower the LF/RF crossover the way you did for Music. Putting in the manual Room Gain change was likely a good idea.
You should give some thought as to what you might be able to do with room treatment or speaker repositioning regarding that room null at 30Hz. Also, you may have OVER treated the LF/RF speakers in the region from 50Hz to 150Hz. Flattening out what should have been their normal response to the Room Gain of your room.