I have a Marantz SR4600 receiver.I wanted to measure it's approximated performance with an excellent quality sound card and RightMark AudioAnalyzer.
I have a neccessary voltage divider for speaker-to-line levels conversion. My other amp, Technics SU-V4X works ok.No problems at all.
With Marantz, I have no voltage reported across speaker terminals when measuring with a multimeter and playing a sine tone through speaker.
Still the speaker is playing very loud.
To be assured, I also connected the receiver to pc's line in. Here a signal is not sensed too, although I've fiddled with volume. So, I doubt it is a multimeter's fault.
I don't have much experience with various exotic amp designs... So possibly I'm missing something.
Maybe, this has something to do that (perhaps) Marantz used switching mode discrete amps?
With sincere greetings, Daniel K.