![]() I don’t know what Ted Denney/SR had in mind so I can only offer an opinion. You’re a professional writer - use English accurately.Īs for anything fraudulent taking place, I can’t say. There’s no faulty test because no test was done in the first place. A test implies valid comparisons (no valid comparisons were presented - only demos), and/or measurements of a system prior to changing a power supply and comparing the measurement taken after changing the power supply, and/or several other possibilities. The power supply regulation takes the place of energy storage, responds quickly to peak loading, maintains very low ripple voltage, and provides immunity to AC line-voltage fluctuationsĬlick to expand.It wasn’t a test. Benchmark's approach is to nearly eliminate all storage after the power supply. Unfortunately, these capacitors also slow down the recovery from voltage sag due to peak loading. These capacitors remove some of the ripple produced by an unregulated linear supply, and help reduce supply sag in order to maintain a high output level immediately following musical peaks. Low Stored Energy - Most audio power amplifiers rely on a bank of large capacitors for energy storage.The switching supply in the AHB2 responds to bass frequencies, maintains a constant low-ripple output voltage, and delivers very predictable output power. A further advantage of regulation is that the output voltage is not a function of AC line voltage, prior audio content, or speaker loading. Switching supplies can produce a regulated output without wasting power and without creating unwanted heat. Benchmark's move to switching supplies changes the efficiency equations. Linear regulation would throw away power that could be delivered to the output devices. The theory is that the amplifier can produce higher peak output power for a given power supply size. Regulated Power Supply - Audio amplifiers usually use unregulated supplies.Resonant supplies switch at low voltage and low current and are much quieter than traditional switching supplies. Resonant switching is used in the AHB2to minimize switching noise. More importantly, the high switching frequency greatly reduces the size of the magnetic components and the magnitude of the stray magnetic fields. Switching frequencies are set well above the audio band. To solve these problems, Benchmark now uses switching power supplies in all of its newer products. This hum is often magnetically induced and is very hard to eliminate. The noise performance of many traditional power amplifiers is limited by the amplitude of the AC line-related hum. These large low-frequency transformers generate large stray magnetic fields that can interfere with other nearby devices, and with the amplifier itself. The problem with these 50 to 60 Hz transformers is that they must be very large in order to supply the required power. Linear supplies have transformers that operate at the AC mains frequency. Benchmark's research shows that this is a myth. The conventional wisdom is that linear supplies are electrically quieter than switching supplies. Resonant Switch-Mode Power Supply –Most high-end power amplifiers use unregulated linear power supplies.Their tech, it has cas, for filtering, not storage. Click to expand.It is not linear, it is a switching power supply. ![]()
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