I connected a volt meter to one of the speaker terminals and selected the 0-15 Volt AC mode. When playing a song with heavy bass at loud levels I'm using anywhere from 3-6 volts AC.

The 4200B is an RMS voltmeter and is selective because it has a tuned circuit to adjust to a particular frequency. The unit uses discrete components and has an analog meter along with an LCD counter.

PG&E began replacing analog meters in 2007; as of the end of August, about 8.5 million of the SmartMeters had been installed, Raftery said. PG&E has about 10 million customers statewide.