I have a JBL PB10, and used VE to calibrate it. I use the standard Radio Shack sound meter. When playing the test tone for the sub, it bounces the needle back and forth, and as I move the meter away from the sweet spot (further from the sub), the sound increases, but the needle still jumbs back and forth. It's been a while since I calibrated, but I'd say it's about a 5db span the needle moves when it goes back and forth. With my other speakers and test tones, the needle is near rock solid. I currently have my sub in the front, right corner of my room. I'd rather not move it since space is tight until I get a bigger place. Is this normal, or should the test tone for the sub have a steady reading like the rest of my speakers? Thanks in advance, Mike D.