CROSSOVER AND CABINET DESIGN
As with conventional cone drivers, the DDD driver requires an enclosure to contain the back wave. In all our models except the Unicorn, which is fully horn loaded, the DDD driver is loaded into a sealed chamber. In addition, with the exception of the Unicorn and Troubadour range, all of our speaker systems are augmented with integral sub-woofers.
Extensive listening tests and detailed measurements have revealed that, “cabinet talk”, i.e. the re-radiation of sound through the walls of the cabinet, is one of the principle causes of degradation of the sense of realism and perceived resolution in a speaker system. To minimise cabinet talk we damp the walls of our cabinets with a highly effective material called Hawaphon®. This consists of a polymer sheet containing a matrix of small cells filled with fine steel shot. It adds mass to the panels to reduce the resonant frequency and the ability of the balls in each cell to move against each other provides a very effective way of converting vibration energy into heat. Originally developed as an anti-surveillance measure for use in military and government buildings, Hawaphon® achieves broadband attenuation of structure-borne sound of more than 50dB, a remarkably high figure. Loudspeaker enclosure panels treated with Hawaphon® generate almost no spurious output. To damp resonances of the air within the cabinet, the whole inside of the cabinet is lined with a 1 cm layer of high density felt. This is achieved by fitting pieces of felt that are precisely cut to fit each panel, rather than just inserting a roll of felt into the cabinet. Our approach takes longer and costs more, but we believe it produces better results.
As an option, we offer an ultimate level of cabinet construction using dual laminations of resin impregnated, bi-directional woven carbon fibre, bonded to an MDF core. This together with Hawaphon damping achieves a level of vibration suppression that we believe leads the industry. Carbon fibre cabinets are significantly more expensive to build, but the improvement in performance they yield is not subtle. For the most dedicated audiophile, for whom even the slightest compromise is unacceptable, our carbon fibre cabinets are the only choice.
German Physiks passive crossovers are the product of extensive computer modelling using our own in-house developed design software. To date, over 20,000 copies have been sold to customers including many world famous companies both within and outside of the audio industry. We take the same no compromise approach in the design of our crossovers as we do in the design of our drivers and cabinets. Components are selected first and foremost for their technical performance, with cost a secondary consideration. For this reason, the custom electronic crossover for our Gaudi is a fully mono design, with a separate power transformer for each channel. These units are meticulously engineered and all components are generously rated to ensure stable operation and long life. The result is a crossover that is free of the veiling that less well engineered designs exhibit.
We acknowledge the following trademarks:
Hawaphon® is the trademark of Korff AG, Switzerland. www.korff.ch
Jordan Module® is the trademark of E.J. Jordan Designs, UK. www.ejjordan.co.uk
Manger® is the trademark of Manger Products, Germany. www.manger-msw.com
NXT® and BMR® are the trademarks of NXT PLC., UK. www.nxtsound.com
TDL® is the trademark of Audio Partnership PLC., UK. www.audiopartnership.com
Walsh® is the trademark of Ohm Acoustics Corporation, USA. www.ohmspeakers.com