Originally Posted by muad'dib
Have an interesting situation I need advice on..
I have 2 sub15's and an anthem avm60..
For now, I don't want to run ARC on anthem as I find without ARC in my room seems better..
Would I do a PBK reading from each sub separate, then, set levels and average distance for both subs together.?.
I know it's best to eq subs together, but since I want bass eq, with no ARC.. Or if down the road had to get a different preamp with no eq, what is recommended..
If yes to eq each sub seperate, then question on mic locations..
One sub is doing bass for center seat to extreme right seats... It does not really add do any good bass from center to left most seats...
So second sub, does the bass from center seat to extreme left seats.
Together both subs give even bass across the entire seating area...
What locations for each sub would be best for readings..
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I'm a firm believer in placing at least one sub close to you (or behind you) and the other up front. Not that you want to hear most from the closest sub but the bass sounds best to me, as I've had 2 SVS SB16 subs up front and 1 sub front and 2nd sub five feet to the left of me.
The trick to getting the best from dual subs is phase matching the subs. In my case, I left the phase of the first sub to its default 0 degrees. I then adjusted the phase of the 2nd sub, the one closest to me, until the combined frequency response was as even and maximal as possible.
Of course, each sub had been gain calibrated to produce 75dB at my MLP (Others use 72-73dB but I like mine a little hot). ARC's Live Measure tool will help you determine the best and optimal phase angle of the 2nd sub as you see how the shape of the combined frequency response varies with phase angle. Once this angle has been determined, you lock it in the sub and make sure you never change it, unless you relocate that sub.
Probably, the reason why you felt the subwoofer sound was better w/o ARC than with ARC was that the subs were not been optimized to play as 1 virtual sub. That's the key...to have them appear acoustically as one wide sub. Also, I use a D2v prepro and the Subwoofer Target Settings has an option setting to the set the HPF order to 'Flat' and not Auto or something else. "Flat" ensures ARC follows the frequency response of your virtual sub and not try to contour it like the "Auto" setting does...
The last thing to do is to time-align this 1 virtual sub to your mains by determining the optimal subwoofer distance to enter into your AVM60 within the xover region. The Anthem manual gives a few ways of doing it. I use a more advanced method which might or might not appeal to you (see my signature for details).
These two things are responsible for the best tactile, 3-dimensional bass I've ever had in my living room. Best of luck!