Groove skrev:
Hva sier dere som har teknisk innsikt om det Marklevinson skriver her?
"Switching power amplifiers get their name because they switch the output devices on and off in very rapid succession, mimicking the input signal. One set of output devices drives the positive half of the waveform, and a separate set drives the negative half. The result is less power being wasted as heat, as the workload is essentially cut in half. Unfortunately, it also creates some significant design challenges in terms of how to manage the switching noise the noise created from the output devices constantly turning on and off as well as a phenomenon called dead bands. Traditionally, these have been the two contributing factors to switching power amplifiers reputation for inferior sound quality. However, Mark Levinson has raised the bar by breaking through these barriers with the Nº53.
The Nº53 removes switching noise without affecting the audio with the introduction of the new patented and proprietary Interleaved Power Technology (IPT), which, among other things, raises the switching frequency of the Nº53 to an extremely high 2MHz. The advantages of this are twofold: first, it pushes the fundamental switching noise and its harmonics far above the limit of human hearing, so that they have no direct affect whatsoever on sound quality; second, it allows for easier removal of the switching noise from the signal by using much gentler filters, having no negative effect in the crucial audio band (the result is a frequency response that is ruler flat across the entire audio spectrum and is only a few dB down at 100kHz impressive for any power amplifier, but staggering for a switching design).
The Nº53 has also overcome the dead band problem. Dead bands are silent gaps in the audio output, created when the output devices driving the positive half of the signal and the negative half of the signal are both turned off. This generally occurs at every zero crossing point, whenever the audio waveform crosses over from positive amplitude to negative amplitude or vice versa."