The Cultivation Foundation Seal
Front of House · Module 1 of 8 · 4 hours

Signal flow, end to end

The one idea the whole trade rests on. Once you can trace a signal from a singer's mouth to the speaker and back to the singer's ear, every console you ever meet looks the same.

6 lessons · 3 paper · 2 practice desk · 1 the room

Every lesson is read, then do, then check.

The check carries its answer underneath it. Look only after you have tried — the attempt is what teaches, not the answer.

Lesson 1 of 6Paper · Needs nothing but a pen

The nine links, in order

Read
A sound has to physically travel through nine things before an audience hears it: mouth → microphone → cable → input → preamp → channel → bus → output → amplifier → speaker. That is the whole chain. Every piece of equipment you will ever be handed is one of those nine links wearing a different brand name. Nothing in live sound happens outside this chain — which is why a fault is always somewhere on it, and why guessing is never necessary.
Do
Write the nine links down the left side of a page, in order, from memory where you can. Then beside each one write what it would look like if that link were the broken one. Keep this page. You will use it at the Depot.
Check

A singer is inaudible. How many places can the fault possibly be?

Lesson 2 of 6Paper · Needs nothing but a pen

Draw it without looking

Read
Knowing a list and owning it are different. The test is whether you can produce the chain cold, with nothing in front of you, while somebody is waiting. That is the condition you will actually use it in — not at a desk with notes, but on a stage four minutes before doors with a band watching.
Do
Put your notes face down. Draw the full chain from memory, left to right, labeled. Then turn the notes over and mark what you missed. Repeat it until you get all nine with nothing missing. Most people need three or four attempts; that is normal and it is the point.
Check

Why is this done from memory rather than from a diagram on the wall?

Lesson 3 of 6Practice desk · Runs in a browser, including a phone

Mic level, line level, speaker level

Read
The same sound exists at three wildly different strengths on its way through the chain. A microphone puts out a tiny signal — thousandths of a volt. The preamp lifts it to line level, which is what the rest of the desk expects to see. The amplifier lifts it again to speaker level, which is strong enough to physically move a cone. Plugging one level into a socket expecting another is the cause of a whole family of faults: nothing at all, barely anything, or a horrible distorted roar.
Do
On the practice desk, bring up one channel and watch its meter. Then set the gain to its lowest setting and look again, and to its highest and look again. You are watching mic level become line level. Note what the meter does at each end.
Check

You plug a microphone into a socket expecting line level. What do you hear?

Lesson 4 of 6Paper · Needs nothing but a pen

Balanced, and why a cable has three pins

Read
An XLR cable has three pins: one is the shield, and the other two carry the same signal with one of them flipped upside down. At the far end the equipment flips it back and adds them together. Any interference the cable picked up along the way got picked up by both wires equally — so when one is flipped, the interference cancels itself out and the music does not. That is balanced, and it is why a 100-foot XLR run is quiet while a 100-foot guitar lead hums.
Do
Look at the end of an XLR connector and count the pins. Then write, in your own words and in one sentence, why flipping one wire removes noise. If you cannot say it in a sentence you do not have it yet.
Check

Why does a long unbalanced cable hum when a long balanced one does not?

Lesson 5 of 6Practice desk · Runs in a browser, including a phone

The path back to the singer's ear

Read
The chain does not stop at the audience. A performer has to hear themselves, so the signal also leaves the channel on a separate path — an aux or monitor send — and goes to its own amplifier and its own speaker pointed back at the stage. You are therefore always running at least two mixes from the same sources: one for the room, one for the band. They are independent. Turning a singer up in the room does nothing for what the singer can hear, and this misunderstanding is behind most of the arguments between a band and a sound engineer.
Do
On the practice desk, raise a channel's fader and watch the main meter move. Now raise that same channel's monitor send and watch the monitor meter move instead. Prove to yourself that one does not affect the other.
Check

A singer says they cannot hear themselves. You push the fader up. Did that help them?

Lesson 6 of 6The room · Needs real equipment · the Depot

Finding the break

Read
This is the lesson the other five exist for. A channel is dead. You do not swap parts hoping, and you do not start at the end you can reach most easily. You walk the chain in order, and at each link you ask one question: is the signal here yet? The first link where the answer is no is the fault. A trained person finds a dead channel in under a minute with no spare equipment at all; an untrained person replaces three working microphones first.
Do
At the Depot, an instructor breaks one channel while you are not looking. Find it by walking the chain, out loud, saying which link you are testing and how. Then do it again with a different fault. Then watch somebody else do it and catch where they skipped a step.
Check

You have found that signal reaches the preamp but not the channel. What have you learned, and what have you ruled out?

For whoever is teaching it

Instructor notes

  1. This module decides whether the rest of the course lands. Do not rush it to get to the exciting equipment — a student who owns the chain learns modules 3 to 8 roughly twice as fast.
  2. Make them draw it rather than recite it. Recitation hides gaps; a drawing shows you exactly which link they do not really believe in.
  3. The three levels (mic, line, speaker) are where adult students most often nod without understanding. Ask what happens if you get it wrong, not what the levels are.
  4. Expect the monitor-path lesson to be the first genuine surprise for anyone who has been in a band. Many musicians have spent years not knowing why 'turn me up' got them nowhere.
  5. The fault-finding lesson needs real equipment and therefore the Depot. Never set it as homework — students have no gear at home or at rehearsal.
  6. If a student can only trace the chain in one direction, they do not have it. Ask them to trace it backwards from the speaker.
  7. Close by telling them plainly: this and cable discipline are the two things that make them employable. That is a quote from the curriculum, not encouragement.

Slide running order

What goes on the screen.

  1. The nine links, as one line across the slide
  2. The same nine, with a red X on one — 'where is the fault?'
  3. Three levels, three sizes of the same waveform
  4. An XLR end, pins numbered
  5. Two wires, one flipped, interference cancelling — animated if possible
  6. One channel feeding two separate paths: room and stage
  7. The order of questions when a channel is dead

If you want more

Extra credit

  1. Trace the chain on something at home that is not a PA — a television, a car stereo, a pair of headphones. The nine links are all still there.
  2. Write down the chain for a singer with an acoustic guitar: how many separate chains are now running, and where do they first meet?
  3. Watch any live performance footage and count how many monitor wedges you can see on the stage. Work out who each one belongs to.
Module 2 · Cable wrap, connectors, repair →All eight modules