IFB Amplifier
The C1MB battery-powered belt-pack unit allows
either loudspeaker or headphone monitoring of a cable- connected audio signal,
and would typically be used to drive a presenter's earpiece with an IFB feed.
- Output stage senses load-impedance to provide near-constant sound level in all headphone types.
- Selectable limiter prevents clipping distortion and damage to hearing with earpieces & headphones.
- Built-in 0.5W speaker & 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 - up to 200 hours use when driving a high impedance earpiece.
- Low battery voltage indicator.
Line Input |
Input Impedance |
200k ohms, active balanced |
Input Connectors |
XLR3 plug & socket |
Input Signal Limiter Threshold (max gain) |
Adjustable -3dBU to +3dBU |
Input Signal Clipping |
|
|
Battery 9V (max)
| Battery 6V (min)
| |
Gain Switch Setting
| 0dB |
20dB |
0dB |
20dB |
Max Input Level
| +16dBU |
-4dBU |
+10dBU |
-10dBU |
|
|
Headphone Output |
Max Headphone O/P Level - No Limiter |
+15dBU @ 9V,+9dBU @ 6V (no load) |
Max Headphone O/P Level - With Limiter |
Threshold level +6dB (no load) |
Headphone Output Impedance |
280 ohms |
Headphone Connector |
A gauge 6.35mm stereo jack, tip & ring. |
Battery Voltage for Constant Limiter Output |
9V to 6V |
Maximum Gain I/P Level to Produce Clipping at the Headphone Output
|
(As the gain of the headphone amplifier is set by the load impedance, only high impedance loads
are affected by signal clipping. The input signal levels shown are for a 2000-ohm earpiece load
and correspond with the levels which produce signal clipping in the loudspeaker amplifier.) |
|
|
Battery 9V (max)
| Battery 6V (min)
| |
Gain Switch Setting
| 0dB |
20dB |
0dB |
20dB |
Input level (max gain)
| +6dBU |
-14dBU |
0dBU |
-20dBU |
|
|
L.S. Amplifier |
Maximum Loudspeaker Power |
0.5W with 9V battery |
|
Power Supply |
Power |
9V PP3 battery (500mAh, typical) |
Low Battery Indicator Threshold |
6V |
Quiescent Current |
|
|
Headphone
| Headphone with Limiter
| L.S.
| L.S. with Limiter
| |
Current (no signal)
| 1.5mA |
5mA |
5.5mA |
9mA |
|
|
Physical |
Dimensions |
W65mm H40mm D150mm |
Weight |
290g |
Case |
Diecast metal with light grey finish |