Turn the "Main" volume dial to zero. This is a good safety precaution to adhere to because it eliminates the risk of unexpected sounds reaching the speakers. For example, a fault with the mixer or a damaged cable can result in buzzing. If the Peavey 8600D is turned up, this can be an extremely unpleasant experience for anyone within earshot.
Fit a 1/4-inch jack cable to each of the “Main (Monitor)” jacks.
Connect the other end of each jack cable to the “Input” jack on each speaker, respectively. If there is only a short distance between speakers and Peavey 8600D, coil the cables and tape the coils before connecting to avoid having loose cable on the floor. If the cables are too short to comfortably reach the speaker, move the Peavey 8600D closer to the speakers. It’s dangerous to have speaker cable stretched between two points, especially if it runs above ground to connect the two points.
Connect all required audio sources to the Peavey 8600D mixer section. There are eight channels, each with an XLR input and a 1/4-inch jack input. The former is for microphone cables and the latter is for instruments such as electric guitar, synthesizer and guitar amplifier line-out sockets.
Turn the “Gain” dial for each channel to zero.
Fit the three-pin power adapter to the socket on the rear of the Peavey 8600D. Connect the power adapter plug to the wall socket.
Turn on the Peavey 8600D. The power switch is located to the left of the three-pin power adapter.
Turn the “Gain” dial of the first channel up to around 50 percent.
Gradually increase the "Main" level up as you audition the input device. For example, sing into the microphone or play the guitar. Adjust the "Main" to your preferred volume and listen to the sound as it comes from the speakers. If the speakers start to feedback, reduce the channel “Gain” level.