The PM57 is for connecting headphones to a speaker line. The 1/4 Mono/stereo loop jacks are for connecting many boxes in series. There are 2 headphone jacks and volume control. The PM57 uses the speaker line signal for power, and uses no batteries. The attenuation switch on the PM57 helps match the correct level input to get the desired headphone level.
- No external power or batteries required.
- Power Amp loop through
- Mono/Stereo mode
- Converts speaker level signals to headphone level
- Attenuation switch to match up proper input level
- Will monitor 25, 70 and 100V lines
World of Stereo, Inc. is an Authorized Rolls Retailer.