Thermionic Culture THE EARLYBIRD 4 4 Channel mic. Pre amp - Manual (Page 7)

©Thermionic Culture Ltd., July 2014 6
3 Metering
The meters are of a VU type, but they have a compressed
scale above 0VU. They measure the actual output of the
electronics, less 2dB, not necessarily the actual output as
they precede the Output Trim controls. They will only
measure the actual output when the Output Trim is set to the
‘M’ position (with a load impedance of 10kΩ).
NOTE:- 0 VU is set to the original British standard of +8 dBm
rather than the usual US standard or +4 dBm.