It's old and retro - not dirty. For those who aren't aware of the history, the Axiom factory was a closed down furniture factory when Ian purchased it. Legend has it, the owner of the factory heard a pair of Ian's home-made speakers and agreed to trade the factory for the speaker pair. Eventually he expanded it.

You heard it. He's torture-testing a 1500W mono amp.

At around 17 minutes in, there are some weird-looking speaker topologies that never saw the light of the production floor.

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated