Description
About German Physiks Unlimited Black
- Lincoln Walsh isnt exactly a household name in audiophile circles, but he literally turned driver design on its head in the early 1960s with his revolutionary bending-wave transducer.
- The Walsh driver looked like a giant inverted ice cream cone, terminated at the wide end and driven by a voice coil at the narrow one so that that sound was only radiated from its convex side.
- The cone was made thin enough so that its mode of operation transitioned from being piston-like in the bass range to bending wave in the lower midrange. Imagine vibrational waves rippling down the cone at a speed exceeding that of the speed of sound in air.
- By judicious choice of materials and variation of the cones stiffness profile over its length Walsh was able to achieve a coherent propagated wavefront perpendicular to the cone axis. Sonically the cone behaved much like a pulsating cylinder with all frequencies in phase with the input signal.
- Two other important benefits ensued from this design: wide-range operation from a single driver and an omnidirectional radiation pattern approximating that formed by an ideal pulsating sphere.
- The conceptual beauty of a bending-wave transducer resides in the fact that it exploits the non-rigidity of the diaphragm material, working with it rather than fighting it.
- Walsh experimented with several cone materials and obtained excellent results using a 0.002-inch thick aluminiumsheet formed to give a 6-inch diameter at the large end.
Technical Specifications
- Drivers:One carbon-fiber DD driver, one 8-inch woofer
- Frequency response:32Hz24kHz
- Nominal impedance:4 ohms
- Sensitivity:88dB 1W/1m
- Crossover frequency:200Hz
- Power handling:Nominal 110W; short-term, 170W
- Minimum amplifier power:90Wpc/4 ohms
- Dimensions:9.5 x 41.3 x 9.5
- Weight:28.8 kg
Reviews
There are no reviews yet.