Adire has come up with a new Subwoofer motor. One that has BLOWN me away with it's potential SPL. About 80 mm one way linear X-max. This is one sub motor to recognize with. Read about it here: http://www.adireaudio.com/Files/Dan/Parthenon/ 121dB reference volume NAKED, without a box. This sub will be THE sub for the future DIY'ers IMO.