In class-A, it consumes 485W at idle in class-AB, that drops to 92W. The Plinius A-150 has one fairly rare feature: selectable class-A or class-AB output. Hum and noise are specced as 100dB below rated output, 20Hz-20kHz, A-weighted, and total harmonic distortion (THD) as <0.03% at rated output power. There are four pairs of output devices per channel, totaling 16 output devices per amp. These considerable power outputs are made possible by transformers specified to supply over 1000VA into the output stages, supported by 14,700в™џ of capacitance per rail per channel, or 58,800в™џ per amplifier. As a monoblock, the A-150 will produce 450W into 8 ohms or 600W into 4 ohms. In stereo, as I used it, the A-150 is specified to deliver 150Wpc into 8 ohms or 250Wpc into 4 ohms, and will produce current peaks of 50A per channel. Plinius Audio Limited has been producing electronic components since 1980, so itвЂ™s probably safe to assume that they know a thing or two. The Reference A-150 is a medium-size (20вЂќW x 8.75вЂќH x 18вЂќD and 83 pounds), solid-state, stereo/mono power amplifier manufactured in New Zealand. I donвЂ™t exaggerate - as you know, we audio reviewers never exaggerate - when I say that it took me all of five seconds to hear a dramatic difference between the Plinius and my reference Boulder Amplifiers 2060 stereo power amp. That story of the Krell and the ClassГ© instantly came to mind when I installed in my system the Plinius Reference A-150 power amplifier ($13,000 USD). Ever since, IвЂ™ve enjoyed comparing power amplifiers and listening for just these crucial differences. But from that day on I knew that even two power amps that met all of those requirements could still differ greatly in terms of something just as important: sound quality. IвЂ™d known that the choice of power amp was important in terms of ensuring that it could drive my speakers properly and to sufficient sound-pressure levels. I switched back and forth between the Krell and ClassГ© many times, marveling at the differences I heard. The Krell sounded open, alive, and vivid - by comparison, the ClassГ© now sounded closed-in and dark. I donвЂ™t recall what I expected when I swapped in the Krell, but what I heard shocked me. I owned a ClassГ© Audio CA-100 power amp, and had bought a used Krell KSA-50S to compare to it. I had a pair of Bowers & Wilkins P4 floorstanding speakers in Rosenut finish. I vividly remember the first time, over 20 years ago, when I realized just how much the sound of a system could be changed by swapping in a different power amp. But most things, of course, do matter, and thatвЂ™s where I focus my attention.Д¬ase in point: power amplifiers. I wonвЂ™t list here all the things audiophiles do to alter the sound of their systems, but suffice it to say that I donвЂ™t spend hour after hour comparing footers or cable elevators in attempts to season the sound of my stereo to suit my palate. IвЂ™m not a member of the Everything Matters camp.

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