Is Direct Servo stable?
When it comes to DIY servo subs, the first concern that comes to mind is the stability. Servo subs at one point had bad press because too many poorly executed projects were out there. These were too often done on a trial-and-error basis, without considering the control system or theories behind them. We can assure everyone that Direct servo system is absolutely stable. A few of the features of the Direct servo system can further demonstrate that. First, the system is stable even when the amp is in clipping. Most accelerometer-based systems are not stable when the amp clips. So the protection circuit in those systems is a necessity, rather than a value added feature. We choose not to put in any anti-clipping circuitry, because such circuitry reduces linear dynamic range. Second, there is no relay in our amps. Some servo system cannot work without relays of instability during power-on. The power on noise of our system is just like that of a regular non-servo system.
