At long last my sub is finally complete! I was quite nervous hooking it up for the first time but it all seems well and good. I have a couple of questions. I am using the Parts Express 250W plate amp. I took the single RCA subwoofer out and hooked it up to just the right line level input of the mixer as I do not have a Y cable. What is the impact of this. Tomorrow I am going to go buy a Y cable, just curious to know what the single side hook-up will do versus both sides. Should I expect even more from this sub? I am impressed enough as it is! My second question relates to calibration. What is the correct way to calibrate the level on this thing? So far I ahve just listen to a 200 - 20 Hz sweep and tried to even the sound out by ear. What is the "proper" way to calibrate this beast. Last of all, I have not modded my amp in the way many others have. If I do the resistor mod, what change in performance can I expect. While it is tuned to 15.4Hz, it does not seem to go as low as this? Will the mod allow it to go lower. Thanks in advance. Robin Smith.