Re: Hyperion 968 ολική αναβάθμιση
καλοριζικος....
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Good as all that stuff is, the real mojo behind the KA I-180 is the claimed capability of delivering roughly 70% of its rated output power en’ pure class-A all the while remaining nearly as efficient as a class D amp. Sound impossible? You’d be right to cast a serious doubt or two. After all, this claim slaps the face of everything we’ve been taught about conventional class-A design. The KA I-180 is not a large amplifier that requires small rainforests for energy, and it doesn’t even run hot enough to cook a meal on. Instead, it’s small, efficient, and only requires two small heat sinks for proper heat dissipation. There are also no ventilation holes found anywhere on the chassis. How does Milan get away with this?
Here is how it works. While most bi-polar circuits have fixed DC voltage rails, Milan sums the voltage rails on the KA I-180 near zero, allowing only minimal current to pass through. While this allows for very cool and efficient operation, the problem is that a certain level of voltage must be kept in order to maintain class-A bias, and you cannot put more voltage across the rails than what they are summed around. One of the only ways around this problem is to have a separate circuit send out a signal across the rails to yank up the voltage along the supply rails before the main signal hits them. At this point, Milan defers operation to a sliding bias which adjusts the voltage as needed. Melding together all of the above into a workable good sounding product is no easy task, but when done right, you will get great power efficiency, cool operation, and true class-A output – at least to a point.