RCA to XLR preamplifier

Bridged or XLR amplifier requires two input signals, HOT (in phase) and COLD (180deg inverted) but most of the CD players, DACs, receivers have only RCA outputs, so I decided to prepare simple preamplifier which provides both signals for bridged or fully differential amplifiers. First stage of the preamp have voltage gain of approx 3,2x and second stage is a simple unity gain inverter. As the series and feedback resistors in inverter circuit have quite low resistance 1kR , chosen OPamps should have be able to drive as low as 600R loads and must be unity gain stable.

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