The Bose 802 is a high-end professional speaker, commonly used in sound stage performances. These speakers do not connect directly to a sound receiver, but instead a power amp, which itself is connected to an audio mixer. Although the overall connection process only requires one cable per speaker, it is different from a standard home stereo system, so if you are new to using larger, high-end speakers, it is important to know exactly how to connect the equipment.
Insert the quarter inch cable into one of the "Channel Out" ports on the mixing board. Plug the opposite end of the cable (both ends of the quarter-inch cable are the same, so it does not matter which end you use) into the "In" port on the power amp.
Connect a second quarter-inch cable into one of the "Out" ports on the power amp. Then insert it into the "In" port on the Bose 802 speaker.
Connect a second Bose 802 speaker to the same channel by inserting another quarter-inch cable into the "Out" port on the first Bose speaker. Then connect the opposite end of the cable into the "In" port on the second Bose speaker.
Repeat this entire connection process with the second "Channel Out" connection on the mixing board, if you want a stereo sound instead of a mono sound system.