I use Ricci’s write up as a way to calibrate my subs. Yours may be little different since they are opposing ones though, so if it is really different than hopefully someone will chime in.
Ricci’s write up (entire thread it is from is also below):
1. Pull both SW's out into the middle of the room and place the mic or SPL meter close and facing the cone. Calibrate the first sub(whatever, doesn't really matter what level yet so long as you match this with the 2nd sw). Move the first sw out of the way.
2.Then move the other sub to the exact same spot as the first sub was measured and set it for an identical level. At this point you should leave the SW gains on the plate amps, if applicable alone and start messing with placement of the 2 subs if you can.
3.Find the spot with the flattest FR or most deep bass reinforcement (take your pick) for the 1st sw.
4.Then identify what the weaknesses in that response are and play around with positioning of the 2nd sw and try to find a spot that ends up with the best combined response at the listening position.
5.Then EQ both sw's together to further shape things up.
6.Finally recalibrate to whatever overall SW level you wish using the reciever/ processor sw level control.
This would only work for identical subs.
It's very simple. This is the only way to ensure that the subwoofers are truly level/gain/SPL matched(whatever you want to call it. It's all the same thing. Gain does not mean that little knob on the back of a SW plate amp necessarily.) . This will insure that both subs are working equally hard and will run out of gas or be overdriven at the same time You do not want to level match them from different positions. Of course one sub may be contributing the majority of the output at the listening position when it's all said and done, but that does not matter. It's about using the subs to the best of BOTH of their abilities and even power distribution between them. Completely regardless of where your SW's will be placed finally in the room, or car, or outside or wherever they finally end up.
During initial set-up pull both subs out into the middle of the room and put your mic or SPL meter close to the driver pointed directly at the cone. Set the level of the first one to whatever you want. Move it out of the way and repeat with the 2nd sw . Now they are level/gain matched and you then proceed with your calibrations from there. Mess with positioning, EQ, overall SW level from your preamp or reciever, whatever. Just apply it to both subs equally.
Thread it came from:http://www.avsforum.com/avs-vb/showt...t=calibrate+eq