German Physiks Unlimited Ultimate mini review

The Art+Sound mini-review of the superb German Physiks Unlimited Ultimate loudspeakers is now on our YouTube channel.

German Physiks truly bring something special to the speaker market with the DDD driver.

The DDD driver has two key distinguishing features:

  1. It is omnidirectional, meaning that it radiates the sound evenly around it.
  2. It has an exceptionally wide operating range. In most models it typically covers the range from 200Hz up to 24kHz – almost 7 octaves – though in the Unicorn Mk II, it covers the range 40Hz to 24kHz – over 9 octaves.

This extremely wide range is achieved by the use of 3 modes of radiation:

  • Pistonic radiation

Where the driver cone moves back and forward like the piston in a car engine.

  • Bending wave radiation

Where the driver cone flexes and a wave is made to travel down its side.

  • Modal radiation

Where the driver cone is allowed to go into break up and areas of excitation are created on the cone surface. In a simplified form we can think of these areas as looking like the pattern of waves we see when a stone is dropped into a pool of water. In reality the patterns will be more complex and they will change with frequency.

By comparison, most loudspeakers use drivers that only use pistonic radiation. These have a much narrower operating range and as the frequency rises, they tend to concentrate their energy into a progressively narrowing beam.