A preamp connects with stereo components to process an audio signal before it passes on to an amplifier that boosts the signal within a speaker system. Hooking up a graphic equaliser to the preamp helps shape the tonal qualities of the audio signal by adjusting different frequencies. Pre-amps are equipped with an EQ Loop button which disables the equaliser connection when a button is pressed so an unprocessed audio signal goers directly to the amp. The components connect with standard stereo cables.
Connect the white and red plugs on one end of the stereo cable to the "OUT to EQ" jacks on the back of the preamp by inserting the white plug into the left audio jack and the red plug into the right.
Insert the plugs on the other end to the input jacks labelled "equaliser loop input" or similar wording on the back of the equaliser.
Hook up a second stereo cable from the "Out to AMP" jacks on the equaliser to a set of audio inputs on the amplifier, matching white to left and red to right.
Press the "EQ Bypass" button or similar wording on the equaliser, depending on the model, to send an unprocessed audio signal from the preamp to the amplifier without equalisation. Press the button a second time to stop the bypass and adjust frequency settings on the equaliser, which will then send the signal to the amp.
Connect the stereo cables between the preamp, equaliser and amplifier before plugging in the power cords.