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X250 owner manual Page
Models:
X250
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Specs
Warranty
Setup
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Pass X250
Owner's Manual
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Contents
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The X250 stereo amplifier embodies the design technology and refinements of the larger X series amplifiers including extensions of the patented Supersymmetry circuit
Setup
Speaker Interface
Fun Hardware Facts
Interconnects and Speaker Cables
Warranty Information
Once it was recognized that excessive use of negative feedback was creating problems with the sound, several designers addressed the problem by simply reducing the amount of feedback and regaining the performance by paying more attention to the character of the amplifying circuit itself. Feedback stopped being a “something for nothing” idea, and became more like a credit card, which is OK to use as long as you can afford to pay when the statement arrives. In this case, the ability to pay involves the intrinsic quality of the amplifier circuit. The paradox is that feedback is best applied around circuits that need it the least
Rushing to market in the 70’s with their low TIM distortion designs, companies employed either simpler or more complex circuits to achieve high slew rates. The amplifiers that had simpler circuits with fewer parts tended to sound better than the amplifiers with complex circuits and a lot of parts. They also cost less and broke down less often, not an unimportant benefit
Supersymmetry does not reduce the distortion and noise present in either half of the output of the balanced circuit. Comparing the distortion curves before and after the application of supersymmetry, we see essentially no difference in either half of the balanced pair considered alone. It is the balanced differential characteristic that improves dramatically, and that leads to one singular requirement of supersymmetric operation it must be driven by a balanced input signal and it only produces a balanced output signal. You could drive it with a single-endedinput and hook a speaker up to only one output and ground, but there would be no point to it at all
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d the differential distortion with supersymmetry
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X250 distortion curve
PASS
X250 SPECIFICATIONS
