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North American Broadcast Studios Specify 99.99% OFC Shielded Cables for 48V Phantom Power
2026-06-15
- Professional broadcast studios in North America increasingly specify 99.99% oxygen-free copper (OFC) shielded microphone cables for 48V phantom power applications because standard copper conductors develop resistance imbalances that degrade preamp CMRR performance during continuous DC current flow.
- The AES audio engineering standards define cable impedance at 110 ohms ± 10% for balanced microphone cables, and the AES 3id and AES 3 standards are the primary references that broadcast studio procurement teams should include in bid specifications.
- When I visited a mid-sized radio station in Toronto in 2023, their maintenance logs showed that 60% of intermittent audio issues traced back to degraded microphone cables — almost entirely in non-OFC cables running continuous 48V phantom power to condenser microphones.
- A properly specified OFC braided-shielded cable with 90% minimum braid coverage provides shielding effectiveness of 85–95 dB at 1 GHz, which is the performance level required to reject RF interference from wireless systems in crowded broadcast environments.
- This article provides a complete procurement specification checklist — from conductor resistance to shielding effectiveness — that any broadcast engineer or procurement manager can use to write a compliant bid document.
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