Why is good, deep bass so difficult? - Myths and their Busters

The servo-controlled woofers in Rythmik subs are described as "stopping on a dime". I liken them to a high-torque engine---very responsive. They "track" the signal very closely; no overhang/overshoot, no bloat or plumpness. Lean and clean!

@soundsrealaudio 

So you obviously could not find any (not one) high end professional studio facility using 6 inch woofers for their main monitors!!!

I hope you learned something. 6 inch woofers being fast is a myth. As far as bass is concerned 6 inch woofers are woefully inadequate except in near field setups where a compromise in bass response, accuracy and dynamic range is acceptable for convenience and cost benefits.

The great myth about subs is - while many audiophiles expect their subs to be fast - there is nothing fast or quick about 20 HZ or even 30 HZ. While there are good and bad subs "there is no such thing as a fast sub". The job and the only job of a good sub should be to faithfully produce the bottom octave/octaves of your musical presentation. A good sub should always be filtered to operate only below 50 or 60 HZ, otherwise you're expecting it/them to do the job your high dollar stereo speakers (regardless if they are panels or boxes) should be doing. While I'll not argue the importance of the quality of driver/drivers, cabinet, electronics and design, needed to make a good sub, the size of drivers and cabinet and the amount of power needed to drive it to a level that meets your expectations, is completely dependent on the amount of space you're asking it to fill. Because frequencies below 60 HZ become non directional and interact differently with the room and to the listener than higher, more directional, frequencies. Even in a live performance the lower notes of a string base, base guitar, or organ sound displaced and more felt than heard. It is more critical to match your sub/subs and power to the room than to your speakers.

bdp24

I love that moniker.

You seem to reenforce the belief that subs are not in good control, if not they wouldn't need a servo.