Sennheiser Amplifier Setup. Handset Jack Setup: Remove the CURLY CORD from the telephone base and plug it into the HANDSET JACK on the front of the amp. This is the jack on the right side and has a picture of a HANDSET. Plug one side of the CONNECTOR CORD provided with the amp into the jack on the back left side of the amp that has the picture of the whole telephone. Plug the other side of this cord into the HANDSET JACK of the telephone base. Connect the Sennheiser headset of your choice to the jack with the provided quick disconnect cord to RJ9 connection to the HEADSET JACK on the front side of the amp. This is the jack on the left side that has a picture of a headset. Set compat to A (most phones take A). ◘/▲ = ◘ (Triangle is European volume setting, Square is the American setting). Set mic (1-9 dial underneath the base) to about 5 or 5 How to use the headset: Take handset off of the cradle. Make sure the phone icon on the amp is not pressed down (if it is, that means the audio wi…