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Rolls HE18 — passive bi-directional hum eliminator using transformer isolation to eliminate ground loop hum from balanced and unbalanced audio connections. The HE18 uses audio-grade transformers to break the ground loop path between audio equipment, removing the 50/60Hz hum that appears when connecting multiple devices to a shared mains supply. Bi-directional design means the same unit works in either signal direction — useful at the input or output stage of a signal chain. Passive operation requires no power. Suitable for home studio, live sound, installed audio, and broadcast applications where ground loop hum between interconnected equipment is a recurring problem. Key features Passive transformer-based isolation — no power required Eliminates 50/60Hz ground loop hum Bi-directional signal path Compatible with balanced and unbalanced audio Suitable for studio, live, installed audio, and broadcast Specifications Brand: Rolls Model: HE18 Type: Passive transformer hum eliminator Signal direction: Bi-directional Power: None required (passive) Need help choosing? Contact us at +27 32 586 3694 or support@audicoonline.co.za.