Main

Tech

Construction

Documents & links

Documents relating to this system

• Description of the prototypes - PDF file, 403kB. Theory, info of the prototypes and measurements.
• Patent application WO 2004/082330 - PDF file, 644kB, Downloaded from espacenet.

Info about other motional feedback systems

• Velodyne - Maybe the most well known manufacturer of motional feedback (accelerometer) subwoofers.
• John's Radio Web - Philips MFB speaker (22RH532) (Dutch)- Uses piezo-accelerometer.
• MFBFreaks (Dutch) - Another dutch page about Philips MFB.
• Rythmik Audio - Manufacturer of "DirectServo" subs (velocity sensing coil?).
• Paradigm Servo-15 subwoofer - Accelerometer feedback
• ServoDrive - Manufacturer of ContraBass subwoofers.

Misc

• Speaker Workshop (by Audua inc) - Good program for loudspeaker measurements. Freeware!
• DiyAudio.com - Lively forum (and more) for DIYers.
• Tymphany - Parent company of Peerless, manufacturer of XLS-line subwoofers.
• SEAS - Loudspeaker driver manufacturer. L17REX/P driver was in use in one capacitive motional feedback prototype.
• LinkwitzLab - Contains a lot of comprehensive info about speaker building. Also home of some interesting speaker designs.