Cant seem to find much info out there so I figured I was ask the question here. Building a house with media room and plan on using mrx 1120. My question is do I need any kind of dsp for the subs? I can get a great deal on a dbx driverack 260 but I am just wondering if its really neccesary.
Assuming you will be running two or more subs, it depends on two things:
1. Will your subs located in a way which requires them to be time-aligned?
* If your subs will be located on the same wall (hopefully not!) and are roughly same distance from listening area, then they 'shouldn't' need paired alignment. Otherwise, it's hard to say without measuring (ARC quick measure is good for this) or listening for phase anomalies.
2. If your subs would benefit from alignment, do your subs have variable phase adjustment?
The sub outputs on the Anthems are paralleled, basically a fancy y-splitter. Therefore the Anthem cannot individually adjust them for phase and level, this needs to be done with either your subs adjustment controls, or an outboard DSP.
I have my two subs located in opposing corners, front and back. I am sitting closer to the rear, and can hear and measure a significant improvement with the rear sub delayed 5.5ms behind the front sub. I do this with a miniDSP 2x4 as I just happen to have one, but could also do it with my subs controls.
Most literature I have read on running ARC, suggests using ARC's 'Quick Measure' to time-align and SPL match multiple subs before running ARC proper.
If you have subs with variable phase adjustment, run ARC Quick Measure and adjust the phase on one sub (the one closest to you if applicable) and see what happens to the response... You want to aim for the smoothest curve with the fewest dips...Boosts can be fixed with EQ, big dips cannot.
Good times :-)