The system that 'won' was simply ~4 x 12" woofers,they shouldve compared similar sized systems,or similar displacement for more apples vs apples comparison,but its still good.

There are a few funny systems around- just look at the link

Notice how servo feedback systems simply dont occur in this top end stuff,must be too hard to implement or simply not effective enough.

Mike.e

• heavy, non portable monster from NZ company