52 Bedrock SMxx operating manual © Bedrock Audio BV, 2019
53
9.2. AC Volt meter
The AC Volt meter module is a simple tool to quickly assess the output level of line-level
audio equipment. The line output of a device is connected directly to the XLR input of
the SMxx (after removing the microphone). The SMxx then measures the signal level and
expresses it in the following three units:
• V rms
• dBU
• dBV
AC Volt meter
The XLR connector supplies 48V phantom power to the microphone. This
phantom voltage can be switched on and off through the hardware settings
menu. IMPORTANT: connecting equipment not designed for 48V phan-
tom power to the XLR connector (with phantom power switched on) may
permanently damage the connected device and/or the SMxx. Disable phan-
tom power before connecting to external equipment.
The “AC Volt meter” function of the device is intended for measuring audio
output levels of amplifiers and other audio equipment. NEVER connect the
XLR input pins to AC voltages over 40V; do NOT try to measure the AC
mains with your SMxx.
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