Originally Posted by AVfile
Originally Posted by Bob Pariseau
All the 1-Sub vs. 2-Sub setting does is change the way the Sub volume trim value is applied.
What are the different ways the sub trim can be applied, and is it ok to change it after ARC solution is uploaded?
I recommend you leave the Sub volume trim (Setup > Level Calibration) as ARC Uploaded it. If you feel the need to adjust Sub output for particular content, you can do that with the "temporary" volume trim buttons on the remote (just above the digits). See Section 4.6 in the Manual. Such "temporary" changes do not alter the values in Setup > Level Calibration. IMPORTANT NOTE: These "temporary" settings are remember per type of Input Format, NOT per Source. So a change you make for DTS-HD MA input, for example, will apply to ANY Source feeding that Bitstream.
If you get confused about what you have set with the "temporary" settings, you can reset ALL of them at one go as follows:
Go into Setup and
1) Save User Settings
2) Reload Factory Defaults. If you lose video, continue using the Front Panel Display.
3) Reload Saved User Settings
Since the "temporary" settings are not Saved, this Resets all of them.
If instead of a content specific adjustment like this you feel that ARC has built too much or too little bass into your solution altogether, I suggest you approach that by changing Targets > Room Gain up or down a couple dB. Then re-Calculate and re-Upload. No need to re-Measure. This is mostly appropriate if you think you are getting too MUCH bass (i.e., adjust Room Gain down). On the charts, Room Gain is the shallow hump in the Target and Calculated curves near and below the Crossover frequencies. The Room Gain value is simply the height, in dB, of the peak of that hump over the normal volume level of the curve for that speaker. The effect of Room Gain on what you hear is exactly what you would expect from the shape and height of that hump.
If, on the other hand, you feel you are getting too LITTLE bass (despite the Sub's Calculated curve looking good in ARC), the first thing you should do is verify that the Polarity and Phase of your Sub are properly set to match your main speakers. Since the mains and sub are BOTH playing the same bass at the same time through the octave below the Crossover frequency, if the Sub is out of Phase with the mains you can get phase cancellation. This would sound like anemic bass.
If you only have ONE Subwoofer, you can correct Polarity and Phase for that Sub without having to redo ARC -- your existing ARC solution will just sound better. But if you have MORE than one Sub, and adjust Polarity or Phase in any of them, then you need to re-Measure for ARC as the adjustment you made will alter the combined bass output of the Subs playing together -- which is what ARC hears during Measurement.
As always, if this is your first experience with ARC do not jump to the conclusion that ARC has made a mistake you need to fix. It may simply be that you are not used to listening to properly calibrated audio in your room. Give it some time, before you make "fixes" to what ARC has done. And then periodically go back to what ARC did on its own to reconfirm your "fixes" really are better. But the basic stuff like entering proper speaker distances and setting proper Polarity/Phase for your Sub are your responsibility. ARC can't set those.