Burmester 948 Power Conditioner

  • Power Conditioner
  • On Demo in Scottsdale

The quality of the power supply has become one of the most important components of a high-end music system. Because of the switchable power supplies of computers, TV sets, microwave ovens or light dimmers high-frequency noise and DC components are super- imposed on the mains supply. At times the standing DC component is big enough to cause hum in normally quiet transformers. For the dynamic suppression of superimposed DC components Burmester has developed a patented switching circuitry. Additionally, the 948 contains top-quality filters against high-frequency noise.


Increasing noise pollution in our power lines renders the AC voltage (nominal 120 volts, 60 Hertz) that comes out of our wall outlets one of the weakest links in the high end audio chain. Who has not experienced the phenomenon that a music system doesn’t sound as good between six and ten in the evening as it does at midnight? The reason: The power that flows from the wall outlet at midnight is much cleaner than that of a few hours earlier.

What causes this effect? Burmester Audiosystems identified after some basic research a noise component in the power supply that is solely responsible for the sound deterioration. We measured a miniscule direct current of a few millivolts in the AC voltage. Not only was this DC component not supposed to be there it also varied it’s strength over time. As it increased the sound of the system got worse. Available line filters did nothing to deal with this kind of line pollution. This is too bad because a few millivolts of DC are enough to drive amp transformers of any brand to the saturation point which becomes audible as transformer hum. As is widely known, the purebred transformers of high end amplifiers are particularly susceptible to DC components in the power supply.

The power conditioner 948 functions unlike any other line filter on the world market. Basically, the 948 is a 500 W power amplifier that works in parallel with the AC power supply and compensates as an active system any DC components in the 120 volts AC from the wall outlet. With common passive filters this would only be possible at the price of deteriorating sound. The active DC suppression works on all eight outlets of the 948 and it can be switched on and off.


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