to have no sonic signature of its own. The unit's output stage is a high-bias class-A MOSFET design that is unaffected by cable and power amplifier interface challenges. The BHK Pre also includes a headphone amp possessing extremely low/near zero output impedance, zero feedback, and featuring discrete MOSFET circuitry. There are two amplifier models in the BHK Signature line: the Stereo 250 and Mono 300. Both utilize vacuum tube input stages and MOSFET outputs; the Stereo 250 produces 250 watts/per channel into an 8Ω loudspeaker, 500 watts/channel into 4Ω, and is stable into 2Ω. The Mono 300 produces 300 watts into 8Ω, 600 into 4Ω and more than 1,000 watts into 2Ω. The Mono 300 doubles the output current with half the impedance of the stereo model, by doubling every internal component of the 250 into one unit: double tubes, double power supplies, transistors, capacitors and resistors. The high-value Stellar line was introduced in 2017, designed to bring PS Audio performance to lower-priced, full-sized components. The line was launched with three products: the Gain Cell DAC/preamp. the S300 stereo amp, and the M700 mono amps. The Gain Cell DAC is a moderately-priced combination DAC and preamp that also incorporates a high-performance headphone amp; the S300 produces 140 watts per channel into 8Ω; 300 watts per channel into 4Ω; and is stable into a 2Ω load. The M700 offers a measurable increase in performance that is immediately audible, is the least-expensive amplifier listed in Class A of Stereophile magazines Recommended Components list, and is also one of the most powerful. Its 350 watts into 8Ω, 700 watts into 4Ω, and stability into a 2Ω load ensure that the M700 can drive any loudspeaker. In March 2019, the Stellar P3 Power Plant was introduced, bringing PS Power Regenerator power technology to a lower price-point. A Stellar phono preamp will be introduced in Q3 of 2019, and a Stellar integrated amplifier will be released in 2020. The Power Plant line of power regenerators has been periodically improved. Newer models consist of the P12, P15, and P20 Power Plants, differing primarily in their power-handling capacity and number of outlets. All three models utilize FPGA-based DSD sine wave generators. Both the P12 and P20 are listed in Stereophile's Recommended Components list. At Rocky Mountain Audio Fest in October 2018, PS exhibited the final prototype loudspeakers created by the late Arnie Nudell, founder of both Infinity