Antithesis Subwoofer

System Design

There are two main engineering challenges for the Antithesis system. The first challenge is properly implementing a servomechanism for a closed loop feedback control system. The second challenge is building a high quality transmission-line enclosure and matching it to the chosen driver. The phrase, "A system is only as good as the sum of its parts," is not true in this case, as proper engineering can make the system better than just the sum of its parts. This is the goal of Antithesis, to make a standard electrodynamic loudspeaker perform better than it would normally be capable of.

Driver

• High Power, Long-throw Subwoofer
• Low resonant frequency (f_s), high cone stiffness
• Low Q_ts (0.25-0.4), Q_es (0.3-0.4)

Transmission Line Enclosure

• 1/4 wavelength (f_s) stuffed T-Line
• Possibility to use "Exolinear Tapered Quarter-Wave Tube" (TQWT) design
• ~4 ft. tall, folded line

Accelerometer

• Silicon MEMS (Micro Electro-Mechanical System) Accelerometer
• +/- 50g, <10mg accuracy, linear voltage output

Error Amplifier

• High slew-rate, low-distortion op-amp based
• Produces difference signal between Input and Feedback

Power Amplifier

• High Power Amplifier to drive Subwoofer
• ~500W RMS @ 4ohms