I was hoping the Pass ACA amp would be enough to drive my open baffle horns but it’s not quite up to the task, so I’m reluctantly letting it go.
Maybe you wanted to give one a try but didn’t want to build a kit? Maybe you always wanted to try a Class A amp? Maybe you want to add another for mono-blocks? Regardless, this one is from the most recent version, built, tested and ready to go with less than 10 hours time on it. While it couldn’t quit get the big OBs up to full speed, it sounded exceptional with an older pair of Diapason Prelude II bookshelf speakers...remarkable for the price. I imagine it would be brilliant with vintage, Altecs, Klipsch, Tannoys, etc.Includes Herbie’s Audio Lab Tender Feet ($60.) which were added to damp vibration and provide additional clearance beneath chassis for improved air circulation. Will be packed to ensure safe arrival. Buyer responsible for shipping and any PayPal fees. Designed by an Audio Legend - Nelson Pass
Nelson's company, Pass Labs, makes some of the finest (and most expensive) amplifiers in the world. This amplifier has its roots in decades of award winning amplifier design experience. Minimalist Amplifier Topology
Less is more. Nelson is famous for his "Zen" approach to design and this amp is no exception - it's a minimalist circuit that delivers purity through simplicity. Pure "Class A" Design
Most amplifier designs switch transistors on and off causing noise. Class A amplifiers are always operating in their sweet spot, which is why people say they sound "silky smooth". TECHNICAL SPECIFICATIONS Frequency response = 10 - 20 kHz +/- 0.1 dB Power (stereo) = 8W into 8 Ohms per channel Power (monoblock) = 15W into 8 Ohms per channel. See ACA operation modes for details on monoblock operation. Power Measurement = Measured at clipping with 3% distortion Distortion = 0.7% at 1 Watt (primarily second order harmonic which being even-order is described as "sweet, tubey" and being low-order as "benign/inaudible") Input impedance = 10 Kohm Max Gain = 14dB Damping factor = 10 Output noise = 100 uV Power supply input = Universal 86-264VAC 47-63HZ Power supply output = 24V 5A Heat dissipation = 20 Watts per Channel
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