Sonifex CM-BH4W Belt-Pack 4-Wire Headphone Amp
The Sonifex CM-BH4W Belt-Pack 4-Wire Headphone Amp is a portable communication unit built for the fast-paced world of broadcasting. With its long battery life and crystal-clear audio, it ensures reliable performance whether you’re working on TV or radio productions.
Sonifex CM-BH4W Belt-Pack 4-Wire Headphone Amp Review
Designed with durability and clarity in mind, the CM-BH4W uses transformer-balanced input and output to reduce interference and deliver dependable sound. It can operate in both 4-wire and IFB modes, giving users the flexibility they need for smooth communication. The built-in automatic gain control keeps audio levels steady, while the low-battery warning and extended 150-hour battery life mean fewer interruptions during critical moments.
Sonifex CM-BH4W Belt-Pack 4-Wire Headphone Amp Features
- Compact and lightweight design that’s easy to wear
- Up to 150 hours of use on one 9V battery
- Built-in level control for clear and steady sound
- Low-battery warning light for peace of mind
- Talk switch can be set for push-to-talk or latch mode
Sonifex CM-BH4W Belt-Pack 4-Wire Headphone Amp Specs
- Power supply one 9V PP3 alkaline battery with up to 150 hours of use
- Dimensions 4.9 in wide x 2.6 in deep x 1.9 in high (unit only)
- Weight net 0.6 lbs and gross 1.0 lbs
- Line input impedance greater than 10kΩ transformer balanced
- Line output level +2dBu with 150Ω transformer balanced impedance
- Maximum headphone output level +7dBu with minimum 100Ω load
- Headphone output jack options
- CM-BH4W with ¼ in mono headset jack
- CM-BH4WX with 4-pin XLR headset socket






