Sonifex CM-BH4WX Belt-Pack 4-Wire Headphone Amplifier with 4-Pin XLR Headset Socket
Product worked without any issues. Battery lasted for at least 8 hours. (That's as long as I was using it.) Connected the unit to a 4 wire matrix intercom system to bypass the need for a 2 wire com converter. Worked with the 4 wire intercom headsets from the clear-com belt pack I was eliminating. Also worked well as a testing tool to send audio through the mixer and to listen to mic/line XLR connection.
Specifications
Mic Input Impedance
1k5Ohms Unbalanced for 200Ohms dynamic microphone
Limiter Input Threshold
-60dBu
Line Output Level
+2dBu
Line Output Impedance
150Ohms Transformer balanced
Line Input Impedance
>10kOhms Transformer balanced
Input Gain/Volume
Adjustable off to +10dB
Maximum Input Level
+24dBu
Maximum HP Output Level
+7dBu (ref 9V battery voltage, <1% THD, 100Ohms load)
Minimum HP Impedance
100Ohms
Connections: Line Input
1x XLR 3 pin female socket (balanced)
Connections: Line Output
1x XLR 3 pin male plug (balanced)
Connections: Headset
1x XLR 4 pin male plug (balanced)
Equipment Type
Belt-pack 4-wire headphone amplifier with 4 pin XLR headset connector
Dimensions (W x D x H)
4.92 x 2.64 x 1.89" / 12.5 x 6.7 x 4.8cm
Weight
0.66lbs / 0.3kg