How can multiple woofers generate lower frequency?

There are several factors at work here. Bigger cabinet size results in deeper bass. Something else to consider is that the electrical characteristics of the driver change as more power is applied. By sharing the load with multiple drivers, less heat is generated in the motor and the electrical characteristics ( and therefore the tuning ) remain more consistent over a wider range. On top of this, bass extension is rolled off as the driver has to make longer excursions. Using multiple drivers reduces the excursion level that any individual driver has to make, resulting in greater extension. This is especially noticeable when listening at volume. Besides frequency response, reduced excursion due to sharing the load also reduces distortion. The further that the driver "throws", the more distortion that you have. Therefore having two ( or more drivers ) throw only half as far as one would will typically be slightly "cleaner" than if you just had one doing the work.

With all of that in mind, multiple drivers give you greater extension, more consistent extension regardless of volume, better power handling, lower distortion AND a bigger piece of furniture to move around : ) Sean
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PS.... Multiple drivers also have their drawbacks but that is another subject and thread : )

Thank you for all your inputs. It is very educational to me.

Happy Listening.

Otto

As a Soliloquy 6.5 owner, I can verify it works very well. I have a pipe-organ CD with 24Hz tones and this speaker can rattle the room with them. I tried this CD on a pair of Avalon Eidolons and they were pitiful. You could hear the 2nd harmonic but not the fundamental. In general, for HT I don't really need a subwoofer, but for the sub-20Hz effects the SVS sub I have does have a little more oomph.

The small drivers also allow them to be very quick on transients. Kick drums, etc. sound very realistic.

One thing is kind of unusual, the 3 bass drivers are not all just driven in parallel. They each have different crossover frequencies. Not sure why this is but the speakers have a very coherent presentation.

I would add to Sean's thoughts that a larger woofer, with its greater diaphragm area, also doesn't have to make as large an excursion as a smaller woofer would. The more cone area you get - whether by using multiple smaller woofers or one larger woofer - the less excursion is required to reach the same SPL. A larger woofer also can (up to a point) use a larger motor/coil assembly, which can handle higher power (dissipate more heat), just like multiple smaller ones. Point being, either way you go (bigger woofers, more woofers), the method and goal are the same: Increase total cone and motor size, along with cabinet size, and it will give increased bass capacity.