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BIA - beltpack IFB amplifier
communications monitor with embedded
loudspeaker and headset jack

BIA - beltpack IFB amplifier BIA - beltpack IFB amplifier


The BIA (Beltpack IFB Amplifier), battery-powered belt-pack unit, allows either loudspeaker or headphone monitoring of a communication or audio feed, and is typically used with a presenter's earpiece as part of an IFB kit.

Standard Features

• Selectable limiter: prevents clipping distortion and damage to hearing with earpieces & headphone types
• Built-in 0.5W loudspeaker & amplifier (power to the amplifier is cut when headphones are connected)
• Loop-through male & female XLR connectors enable several units to be driven from a single feed.
• Headphone output on “A” gauge 6.35mm jack.
• Very low battery consumption.
• Low battery voltage indicator.



The input gain is controlled by a potentiometer, a 0/20dB gain switch and a selectable limiter. The limiter can be used to ensure a safe listening level over a wide range of input signal levels and also improves signal intelligibility by preventing clipping of the output signal as the battery discharges. The balanced output stage of the headphone amplifier drives earpieces and headphone, having either mono or stereo jack plugs, with connections to the tip and ring only .
Although this cause headphones to driven in anti-phase, intelligibility of speak is unaffected, and the higher impedances of the series connection ensures the most efficient impedance match to the output stage.

BIA is compatible with similar apparatuses of other brands in commerce.



Battery voltage: 6-9 V
Gain switch setting
0 dB
20 dB
Max input level
+14 dBU
-6 dBU


In accordance with constant improvement policy of products, El.Man (Elettronica Mangione) reserves the right to modify without notice and at any time, features and prices of its own apparatus.

Other Elman intercom and beltpack

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beltpackBIA - Beltpack IFB Amplifier (usable with tbp8)

beltpackDual TBP (Dual Talkback Plus) 8 channels intercom

beltpackEL4400 - Intercom Stations  

beltpackEL4400/S - Terminal for TBP10 10 channels intercom  

beltpackGenius Intercom - 7 channels with interrupted feedback

beltpackTALKBACK PLUS Instant Program 4 Wires Intercom (1RU)

beltpackTBP8 - 2/4 wires 8 channels intercom with interrupted feedback (1RU)

beltpackTBP10 - 4 wires handsfree full duplex 10 channels intercom with interrupted feedback (1RU)

beltpackTBP16 - 4 wires handsfree full duplex 16 channels intercom with interrupted feedback (2RU)

beltpackTBU - Telephone Balance Unit (telephone to 4 wires) (usable with tbp8)