IsoTek, AV & Home Automation SMART DELTA

To ensure the best possible sound quality, the mains supply must meet two basic requirements: a clean 50 Hz sine wave provided by a source with the lowest possible impedance, and no high-frequency noise. Low impedance ensures an almost constant voltage, regardless of how much power is being consumed in the area. In practice, fluctuations of around
5% can typically be expected. The very low impedance of the mains supply, which is well below 1 ohm at 50 Hz, is not maintained when affected by radio frequencies (> 50 ohms > 100 kHz) and acts like an antenna that readily attracts interference. IsoTek's mains filter circuits are designed to reduce impedance, operate reliably and work well into the audio frequency band. They not only employ sound electrical engineering, but also reliably meet electrical safety requirements.

Power surges and voltage spikes in the mains supply pose a general risk to any electrical device, particularly the sensitive components of hi-fi and home cinema systems. Voltage spikes or surges occur when an electrical charge builds up somewhere in the mains supply – for example, due to a lightning strike or the switching on and off of high-power equipment such as lift motors or air-conditioning systems. The resulting changes in the magnetic or electric fields around their high-voltage lines can cause voltage spikes in nearby cables. IsoTek's protection system uses several varistors (VDRs = voltage-dependent resistors) to provide protection against current surges of up to more than 100,000 A. Depending on the magnitude of the surge or voltage spike, the system activates in a flash and in sequence, greatly extending its protection almost instantly when needed. The protection circuit has two main functions: to protect itself and to intervene very quickly and progressively when a problem occurs. The protection circuit also safeguards the filter stages against potential damage, while the filters themselves provide additional support when irregularities arise. Unlike many other protection systems, IsoTek components not only provide optimal protection, but also have a positive effect on sound quality. Studies suggest that voltage spikes occur fairly frequently, particularly in the range of 1,000 to 6,000 V. It is reasonable to assume that most protection systems do not provide comprehensive protection and are also likely to impair sound quality.