Sonifex CM-BHA Belt Pack Headphone Amplifier With Limiter and Loudspeaker

The CM-BHA is a portable, battery powered headphone amplifier for use in live applications such as in-the-field news reports. The CM-BHA can apply gain of up to +30dB to the incoming signal. The volume control simultaneously modifies the output volume and the input gain, allowing input signals op up to +18dBu be reproduced without distortion. The CM-BHA has an adjustable limiter to protect the listener from excessive levels indicated by a blue LED. The limiter is only enabled when an earpiece or headphones are used, and when it is activated by the toggle switch. It is disabled when no jack is inserted, allowing a higher volume to be passed to the speaker for “squawk mode” use..

Technical Specifications

Input Impedance
200kohms electronically balanced
Input Limiter Threshold
Adjustable -6dBu to +16dBu
Maximum Input Level
+18dBu
Input Gain/Volume
Adjustable -60dB to +30dB
Frequency Response
20Hz - 20kHz -0.5 (ref 0dBu 1kHz)
Distortion
<0.015% (ref +8dBu input, 0dB gain,10kohms load)
Maximum HP Output Level
+16dBu (ref 9V battery voltage, <1% THD, 2kohms load)
+12dBu (ref 6V battery voltage, <1% THD , 2kohms load)
Minimum HP Impedance
32ohms
Maximum Speaker Level
+12dBu (ref 9V battery voltage, <1% THD)
+6dBu (ref 6V battery voltage, <1% THD)
Physical
Dimensions (Raw)
12.5cm (W) x 6.7cm (D) x 4.8cm (H)
4.9” (W) x 2.6” (D) x 1.9” (H)
Dimensions (Boxed)
23cm (W) x 13cm (D) x 8cm (H)
9.1 ” (W) x 5.1” (D) x 3.1” (H)
Weight
Nett: 0.3kg Gross: 0.4kg
Nett: 0.7lbs Gross: 0.9lbs