SERVOBASS

During the last 15 years we provided design and analysis services to Waves Audio - a leading software and hardware tools provider  to the professional sound engineering community.

We realized that the 30-60 Hz  bottom octave reproduction by small near field monitor speakers is a significant issue for sound engineers while they do  their music processing jobs.

We took the challenge and developed  a new listening  concept with our ZRS-1 Desktop Near Field Subwoofers placed underneath near field Studio Monitor speakers at Home and  professional studios.

With these subwoofers , low cost monitors can be used with excellent  results because they do not have to reproduce bass notes and can blend perfectly with the subs. 

Subwoofers can only  be made  small by using some active control like Motion Feed Back (MFB). 

In 1968 Phillips published a paper describing the benefits of MFB for low frequency reproduction by small speakers.

Since then, many MFB related patents were issued, most of them were abandoned, terminated or expired after 20 years from their issue date and now can be used by the industry.

This mature  technology was implemented in our ZRS-1 design using on our custom  acceleration sensors.

By monitoring the woofer's Voice Coil dynamics and feeding back a signal to the amplifier's input,  the driver's non linearity and the sharp resonance that are inherent when using small sealed box can be rectified .