Adapter cable 2 x TRS to 2 x RCA / 3.3ft / 1m / black - audio jack to cinch - showking

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The transformer-based approach (like with Neutrik NA2F-DOB-TX or much more expensive Jensen transformers) will work and avoid ground loop issues. Transformers also have higher common-mode rejection ratio than what can be achieved with semiconductors. The distortion might not matter for use with tube amplifiers that already have a transformer in the signal path or with subwoofers.

A more sophisticated connection may be needed for aggressive common-mode rejection, which may require modifying the equipment. For information about this type of setup, refer to the "Shield Wires" section (5.4) of The Clean Audio Installation Guide.

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Transformer-balanced outputs must have the cold output tied to the shield conductor when connecting to an unbalanced load. Using an XLR connector, this corresponds to tying pin-3 to pin-1. The hot signal conductor will be connected to pin-2, as usual, and it will carry the audio information. The shield conductor will be connected, as usual, to pin-1.

The Flex balanced is balanced in/out. If you'd like to use an unbalanced amplifier (e.g. Powered subwoofer) downstream of the Flex series, here is the recommended TRS to RCA cable to minimize detrimental effect on the audio quality. Digital Audio Processor — Flex based on the I/O configuration selected. No Dirac Live license for default configuration Note how the TRS side is only connected with Tip and Sleeve while RCA side is not using the shield.Only fully-floating, transformer-balanced outputs require that the ring terminal is grounded when driving an unbalanced input. Impedance balanced or electronically balanced outputs do not. Your US-1800 is not transformer-balanced. Now the thing is that pins 2 & 3 in a balanced arrangement, never have a potential with respect to ground, just each other.