PASS LABS NEW Xs-300 and Xs-150
"... Made out of billet gold and platinum... just kidding... The new Pass Labs amplifiers are designed to measure well objectively. But they are also designed to perform subjectively as well as they measure. Pass Labs claims their new enhancements further narrow the gap between what scientific measurements report about amplifier performance and what the human ear subjectively hears. That's pretty cool - and for the asking price we'd expect nothing less."
The Xs-300 and Xs-150 Amplifiers are monoblock models delivering 300 and 150 watts, respectively. Both models employ double-stacked chassis, with the power supply and current source in one chassis and the input and main output stage in the other chassis. The separate power supplies enable a bounty of benefits, including lower electromagnetic noise, twice as much storage capacitance as earlier Pass Labs amps, banks of high-speed/soft-recovery rectifiers, improved high-frequency noise filters, bigger and better transformers, improved passive decoupling, massive heat sinks, and lower standby currents
The Xs Series has been three years in development. The first year, Pass Labs settled on the power supply and physical package. The second year, Pass Labs finalized the output stage and front end. The third year, the company refined the front end and the biasing of the output stage.
But now it's deploying.
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In the development and refinement process, Pass Labs applied a number of new tweaks, including adjusting the values for push-pull Class A biasing and the amount of single-ended bias in the output stage. It also significantly increased the single-ended bias in the output stage over earlier Pass Labs amplifiers. All three changes delivered major improvements. Pass Labs also installed sturdy output stage transistors, with a combined capacity well over 10 KW, and massive heat sink assemblies capable of 2 KW all day long.
The Xs-300 and Xs-150 Amplifiers are now available through selected dealers.