What they call "servo" control is actually an accelerometer on the woofer's cone that reports back the movement of the cone. The servo box compares the report from the accelerometer to the actual signal and corrects the differences.
Problem is with long control cable is the woofers tend to be slow in relation to the music. The Infinity IRS Beta suffered from this especially. Newer and faster designs are out there in most of the newer servo subs/woofer/speakers.
The "servo control" is in addition to an amplifier. A "regular" amplifier is still powering the woofer.
Best,
Paul :-)
Problem is with long control cable is the woofers tend to be slow in relation to the music. The Infinity IRS Beta suffered from this especially. Newer and faster designs are out there in most of the newer servo subs/woofer/speakers.
The "servo control" is in addition to an amplifier. A "regular" amplifier is still powering the woofer.
Best,
Paul :-)