Hardware & signal path
Signal chain
The signal chain is the ordered path a sound takes from file to room: player, mixer channel, master, amplifier, speaker. Each stage has its own level and can only pass on what the last one delivered.
In practice
Set the level at every stage, not just the last one. A chain is only as clean as its worst gain decision.
The working order is: file, player output, channel trim, EQ and filter, channel fader, crossfader, master, booth and zone taps, amplifier, speaker. Cue taps off before the channel fader, which is why pre-fade listen works. When something is wrong, halve the chain rather than walking it — check whether the master meters are moving. If they are, the fault is downstream of the mixer; if they are not, it is upstream, and you have just eliminated half the possibilities in one look.
5
Stages from file to room
Pre-fader
Where cue taps off
Master meter
The one look that halves the search
Where these come from: The standard club signal path and a fault-finding method — conventional practice, not catalog figures. For what we can measure, see setting the first stage.
Why it matters
Knowing the order is what makes a fault findable. Sound in the headphones but not the room is after the cue tap; sound on one channel but not another is before the master; distortion everywhere is at or before the earliest stage where the meters go red. Working along the chain in order takes a minute; guessing takes the whole changeover.
It is also the reason gain staging exists as a discipline. Every stage adds a little noise and has a ceiling, so the goal is a healthy level at each one rather than a quiet signal shouted at the end or a hot one squashed at the start.
Frequently asked
Where does the cue signal come from?+
Before the channel fader, which is the whole meaning of pre-fade listen. It is why you can hear a track in the headphones with its fader all the way down.
No sound in the room — where do I start?+
Look at the master meters. Moving means the mixer is fine and the fault is the amplifier, the speakers or the cabling; still means it is the channel, the source or the input select.
What is gain staging?+
Setting a healthy level at every stage rather than fixing everything at the end. Too quiet early means you amplify noise later; too hot early means you can never undo the distortion.
Related terms
Mixer channel
A channel is one vertical strip on the mixer and everything one source passes through: input select, trim, EQ, filter, cue, and the fader at the bottom. The controls act in that order from top to bottom.
Gain
Gain sets how hot a track arrives at the channel before anything else touches it. Most club mixers label the same control trim. It is a correction for how a record was mastered, not a volume control for the room.
Master output
The master output is the mixer socket that feeds the room. Everything you do on the channels arrives there summed, and its level knob decides how hard the club system is driven by the mix as a whole.
Amplifier
An amplifier takes the line-level signal leaving the mixer and raises it to the power a speaker needs. In a club it lives in a rack you will never see, usually behind a processor that handles crossover, delay and limiting.
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