Hollyland HL-2/4 Wire Converter for Intercom Systems

The Hollyland HL-2/4 Wire Converter bridges legacy 2-wire party-line and modern 4-wire matrix intercom infrastructures in broadcast trucks, studios, and live-event venues. Its industrial metal housing, flexible 12–36 VDC powering, and auto-null echo suppression deliver reliable, low-noise communication over long cable runs.

Distance compensation switches let you fine-tune for up to 656 ft (200 m) of cable, while front-panel gain trims and six-segment LED meters provide precise level control. Built-in static and voltage protection guards connected systems, and the compact enclosure integrates easily into existing racks or mobile kits.

This converter supports bi-directional audio and call signalling, making it ideal for integrating Clear-Com®, RTS®, Datavideo®, Syscom 1000T, and similar intercom models without additional hardware.

Key Features

• 2-/4-Wire Conversion: Bi-directional audio & call-signal compatibility
• Auto Nulling: One-button echo cancellation for clean circuits
• Distance Compensation: Switchable for 50 m, 100 m, 150 m, 200 m lines
• Gain Control: ±6 dB trims on 4-wire I/O; 12 dB gain to 2-wire bus
• LED Level Meters: Six-segment indicators for real-time monitoring
• Static & Voltage Protection: Safeguards connected intercom equipment
• Interfaces: 3-pin XLR F (2-wire), 3-pin XLR M (2-wire), 3-pin XLR F (4-wire In), 3-pin XLR M (4-wire Out), USB-C service port
• Wide DC Input: 12 – 36 V 2-wire powering; <1.5 W consumption
• Industrial Build: Powder-coated metal chassis, –4 °F to 140 °F operating range

Technical Specifications

• Dimensions: 4.72? × 4.29? × 1.69? (12.0 × 10.9 × 4.3 cm)
• Weight: 1.14 lbs (0.52 kg)
• Power Supply: 12 – 36 V DC via 2-wire line
• Power Consumption: <1.5 W
• 2-Wire Output
• Noise: <–68 dBu
• Impedance: 104 ? – 240 ?
• Frequency Response: 100 Hz – 5 kHz ±3 dB
• Distortion: <1 % @ 1 kHz
• S/N Ratio: >55 dB @ –12 dBu
• 2-Wire Input
• Max Level: ?6 dBu (uncompressed)
• Input Impedance: >10 k?
• Gain to 4-Wire Out: 12 dB ±1 dB
• 4-Wire Output
• Noise: <–60 dBu
• Output Impedance: <400 ?
• Frequency Response: 100 Hz – 5 kHz ±3 dB
• Distortion: <1 % @ 1 kHz
• S/N Ratio: >55 dB @ 0 dBu
• 4-Wire Input
• Max Level: ?18 dBu (uncompressed)
• Input Impedance: <10 k?
• Gain to 2-Wire Out: –12 dB ±1 dB
• Operating Temperature: –20 °C to +60 °C (–4 °F to 140 °F)

What's Included

• HL-2/4 Wire Converter × 1
• USB Type-C Cable × 1
• Mounting Screws × 5
• User Guide × 1