Level matching your speakers isn’t a topic that gets talked about much these days. With auto-calibration systems like Audyssey MultEQ, Yamaha’s YPAO, Anthem’s ARC, etc., it’s generally done for you.
Microchip Technology’s new MCP651/2/5 operational amplifier targets use in microphone preamplifiers, optical-detector circuitry, digital scales, industrial instrumentation, H-bridge drivers, bar-code ...