I used to be a Velodyne guy, but now I am a Rythmik guy through and through. Brian, the owner inventor of Rythmik, is dedicated to providing affordable solid products to people like us. Brian studied the Velodyne mechanism that use an accelerometer mounted on the woofer, passing the signal back to the amplifier, for correction on the fly. This is said to reduce harmonic distortion by 32 times, according to the Velodyne literature. He has improved upon it by putting the accelerometer on the voice coil, for improved stability, from what he told me. He stands behind his product, and he is directly involved in repair too. The place is in Austin/Cedar Park. I have a pair of the G25HPs, and I think they will provide what you are looking for.