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Related Manuals for Pass Laboratories Pass X250
Summary of Contents for Pass Laboratories Pass X250
- Page 1 Pass X250 Owner's Manual Page 1...
- Page 2 The X250 stereo amplifier embodies the design technology and refinements of the larger "X" series amplifiers including extensions of the patented Supersymmetry circuit. The Supersymmetry circuit topology was granted a U.S. patent in 1994, and is the result of 19 years of effort by Nelson Pass.
- Page 3 Setup You can position the amplifier anywhere you want, but it requires ventilation. We do not recommend placing it in enclosed cabinets or small closets without means for air to circulate freely. The amplifier idles at about 270 watts. Let’s talk about power requirements. The amplifier draws about 2.3 amps (continuous rms) out of the wall during normal audio operation, and this reflects mostly the idle current that we run through the output stage.
- Page 4 get fixed. We go to a lot of trouble to make products reliable, and the failure rate of our amplifiers is very low. This is small comfort to the few, but take it easy and give us a call if you have problems.
- Page 5 Interconnects and Speaker Cables We have a general recommendation about interconnects, which is that they should cost less than the amplifier. We have tried a lot of products and most of them work well, but as a practical matter we cannot make blanket recommendations. The amplifier is not sensitive to source interconnects.
- Page 6 Warranty Information This product is warranted for parts and labor from the date we ship it. Check with the factory authorized distributor in the country you are purchasing this product for specific warranty information. Distributors are only required to offer warranty service on Pass products that they have sold. They are not obligated to offer warranty repair for products purchased from other distributors.
- Page 7 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.
- Page 8 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.
- Page 9 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.
- Page 10 ultimately we found that we could operate it without feedback as long as we put a healthy bias current through it. For these amplifiers this is about 600 watts worth. This is not pure Class A operation in the context of 1000 watts output, but it has proven to be the appropriate amount. The result is a series of amplifiers using the supersymmetric topology delivering up to 1000 watts per channel into 8 ohms with good distortion and noise figures.
- Page 11 intrinsic matching between the circuits, (c) the distortion of each half with supersymmetry, and (d) the differential distortion with supersymmetry. On this curve (B) we can clearly see that intrinsic symmetry due to the matching of the two halves reduces the distortion by a factor of 10. Supersymmetry (D) creates a more perfect match, and results in an additional reduction by a factor of 10.
- Page 12 X250 SPECIFICATIONS All figures obtained after 1 hour warmup, with regulated 120 VAC power line. See manual notes about AC power line regulation. Gain 30 dB Freq. Response -0 dB at DC, -3 dB at 100 kHz Power Output 250 watts maximum @ 1% THD, 1 kHz, 8 ohms Distortion refer to accompanying distortion curve Maximum Output Voltage...
- Page 13 tel: (530) 367 3690 fax: (530) 367 2193 Page 13...
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