K4307 Audio power meter

Can this meter safely be operated on a 100 volt line output amplifier; or can it be adapted to read 100v line output?

maximum input voltage: 130Vpeak (high power mode) among the specs from Velleman.

The thing I would do. snab of the audio signal somewere on a line-level.
0dB corresponds to 0,775Vrms nowadays. I have the same problem as my main amplifier has a higher input sensitivity than this “so called” line level.

I hope this kit has a high input impedance (probabely it has). Velleman can provide this answer. or just look at the schematic.

Please note that this item is powered from the signal that is applied to it (speaker signal).
It will not work with a line level signal.