George,
I first placed the Sp101 platforms so that one leg fell with in the footprint of the stands that hold my mains. This way I could place each sub as close to its partner as possible. I then aligned the sub on its platform so its voice coil was as close as I could measure to that of the mains. I played a test tone that was about the same frequency as the crossover point. Having an RTA allowed me to measure the frequency response of the mains and the subs. Adjusting the phase control from zero to 180 degrees while viewing the RTA screen I found that the subs measured and also sounded best with a 70 degree phase angle. My mains have a first order crossover at 2400hz and are run full range. Tom
I first placed the Sp101 platforms so that one leg fell with in the footprint of the stands that hold my mains. This way I could place each sub as close to its partner as possible. I then aligned the sub on its platform so its voice coil was as close as I could measure to that of the mains. I played a test tone that was about the same frequency as the crossover point. Having an RTA allowed me to measure the frequency response of the mains and the subs. Adjusting the phase control from zero to 180 degrees while viewing the RTA screen I found that the subs measured and also sounded best with a 70 degree phase angle. My mains have a first order crossover at 2400hz and are run full range. Tom