Due to popular demand, the SRPP+ is back, minus the power supplies. The new PCB is 6in by 5in and, like all GlassWare PCBs, is crazy overbuilt, with extra thick double-sided PCB material and heavy 2-ounce copper traces. Each channel gets its own large power supply RC filter, whose voltage rating can be a low 250Vdc, perfect for high idle current applications, such as headphone amplifiers; or, 400Vdc, perfect for line-amplifier use. The SRPP+ PCB holds pads for two sets of output coupling capacitors. All in all, it's a fun little board and I can imagine many different audio applications, from the input stage of single-ended amplifiers to headphone amplifiers for high-impedance cans, such as those offered by Beyer and Sennheiser.