This special adapter cable connects unbalanced analog RCA outputs to balanced analog XLR inputs.
Use this cable to connect unbalanced line-level RCA analog outputs to the balanced analog inputs on an AHB2 or an ADC1. May also be used to connect the unbalanced outputs on a DAC1 or DAC2 converter to the balanced inputs on an amplifier (if the balanced outputs on the DAC1 or DAC2 are already in use). This adapter cable will work with electronically-balanced XLR inputs or with transformer-coupled XLR inputs. Do not use this cable with digital signals.
Special Wiring to Reduce Hum and Interference
- Back-referenced audio ground - for common-mode rejection
- Star-quad conductors - for magnetic immunity
- Dedicated shield connection - for immunity to ground loop problems
This adapter cable extends balanced wiring to the RCA connector using star-quad wire to maximize the effectiveness of the balanced input: One half of the star-quad ties Pin 3 of the XLR to the shield of the RCA connector. The other half of the star-quad ties pin 2 of the XLR to the center pin on the RCA. The braided shield ties pin 1 of the XLR to the shield of the RCA.
Using this special wiring, a ground-loop between the two audio devices will produce a current in the braided shield, but not in the audio signal lines. This keeps ground-loop currents out of the critical signal lines and greatly reduces the potential for interference. The separate connection from the RCA ground to pin 2 of the XLR provides a dedicated path for the audio ground reference. This wiring leverages the common-mode rejection of the balanced XLR input to reduce conducted interference.
To reduce magnetic interference, the audio signal is carried on two twisted pairs arranged in a star-quad configuration. This star-quad configuration provides immunity to hum-inducing magnetic fields produced by nearby electronic devices.
This cable provides the best method for directly interfacing an unbalanced output to a balanced input. Do not confuse this cable with similar-looking RCA to XLR cables and adapters!
Benchmark Adapter Cables
Benchmark Adapter Cables combine the best cable, connectors, and construction techniques in order to offer high performance and excellent durability. Canare StarQuad L-4E6S Microphone and Audio Line Cable is flexible, satin smooth to the touch, and extra strong. The cable offers excellent immunity to hum-inducing magnetic fields (due to 4-conductor StarQuad construction), excellent shielding from RF interference (due to high-density braided shield), very low handling noise (due to internal construction), excellent flexibility (due to 40-strand conductors and special super-flexible insulation), and extended frequency response (due to low capacitance). Benchmark Adapter Cables are handcrafted with true silver solder, using gold-contact Neutrik XX series connectors. The XX series are the most reliable XLR connectors available - providing excellent contact quality, strain relief, pullout resistance, and durability. Neutrik XXR color coding rings can easily be added to assembled cables if desired - order rings separately. A Benchmark-branded sleeve is your assurance that you have purchased a genuine Benchmark Adapter Cable.