Sterling Audio’s new line of professional headphone amplifiers feature gold-plated inputs and outputs for superior conductivity, power-on status LEDs, and low-noise operation. The four-channel S104HA is designed for personal recording studios or other uses where space is at a premium. Housed in aluminum chassis with nonslip rubber feet, it offers one rear-panel stereo, TRS line input, plus four front-panel stereo headphone outputs, each with a 10-increment level slider. The four-channel S204HA features more flexible inputs and robust chassis. Its front panel offers four stereo headphone outputs and balanced TRS left and right line inputs on the rear panel. For demanding professional applications, the S418HA (pictured) features two stereo main line inputs, eight direct line-level inputs for individual monitor mixes, and eight discrete, stereo headphone amplifiers, each with two headphone outputs in a steel, 1U rack chassis. An elegant faceplate with backlighting enables easy operation in low-light situations.