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Pass Laboratories, an audio innovator renowned for its unique high-performance products, will introduce the XA.5 series of power amplifiers at the 2008 International Consumer Electronics Show (prices range from $5000 to $31,000).
The XA.5 Series consists of five models: the XA200.5, the XA160.5, the XA100.5, the XA60.5 and XA30.5. All models offer significant improvements on their classic Pass Labs predecessors and are said to possess the dynamic range to do justice to the 24-bit recordings yet retain subtle nuances of micro-dynamics.
The top-of-the-range XA30.5 provides larger output current capacity than corresponding models from Pass labs' earlier XA Series, with more than five times the current capability! All models feature pure Class A operation with circuitry that does not compensate for any type of high frequency by using little frequency roll-offs, lag capacitors, output coils, Zobel networks, or other techniques. The amplifiers are stable because they are simple gain stages with minimal feedback. Pass Labs replaced input differential MOSFETs with JFETs possessing much less noise, higher input impedance and greater linearity. A new bias generator was developed that eliminated three sources of variation in the output stage bias current. They improved the power supplies by adding storage capacitance, larger and quieter power transformers, and fast-recovery rectifiers. The XA30.5 amplifier ($5000), smallest model in the line, produces 30 wpc at 8 Ohms with 1 percent THD. Its input impedance is 30 kOhms balanced, 15 kOhms unbalanced, measures 19 x 7 x 19 (WxHxD in inches) and weighs 75 lbs. The top line XA200.5 monoblock amplifier ($31,00 per pair) drives 200 wpc at 8 Ohms with 1 percent THD. Its input impedance is 30 kOhms balanced, 15 kOhms unbalanced, measures 19 x 11 x 28 (WxHxD in inches) and weighs an impressive 180 lbs.
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