John, I would echo a good < USD $1000 power amplifier for Pro Audio use that compares well with benchmark. It can have a volume pot, as long as it can be defeated, balanced only (disqualify warranty for any users using RCA to balanced gizmos). Sensitivity switch on input would be fine. Make it bulletproof. I just donated an '80s Mitsubishi power amp that was only 100WPC, but never broke down, it would go red "clipping" and shutdown if loads were inappropriate, but always came back.
If you haven't, study the designs of the Marantz Reference series. These are made in Japan and have 5 year warranties. The newer models can disable the digital and tone controls for a pure analog amp. I never use the built-in CS4398 DAC, and rarely the tone controls, but the amp is Class A/B bulletproof, or at least 4 years into it so far.
I would pay $100 more (than current PA5 prices) for a PA5 v2 if it had this bulletproof capability. I love my PA5 as it is though, and only use balanced, and with decent ventilation and not too hot ambient temps.
Of course, most consumers have a turntable or sources with RCA. So keep making those amps, but specify that there are no inexpensive adapters like Amir sometimes references (the cheap Neutriks), Even the dive bars with lowest of low PA systems use > $150 Whirlwind or other transformer based unbal to bal adapters, if the house board doesn't handle it, so for RCA line level users, the current product lines may be fine for that.
