Higher-tier EMMA classes expect documentation of your build, and a clear system diagram is one of the fastest ways to show a judge (and yourself) exactly how your signal path is wired — head unit through to every speaker and amp channel. You don't need to be a CAD expert to produce one: a general-purpose AI assistant like Claude or ChatGPT can build you a clean diagram from a plain-English description of your gear, provided you give it the right input.
Step 1: Write out your exact equipment list
Before you prompt anything, get this in front of you:
- Head unit / source unit make and model
- DSP or amplifier make and model, including channel count
- Every speaker: location (e.g. front door tweeter, front door midbass, rear deck), make and model
- Subwoofer make, model and enclosure type
- Any signal processors, line drivers or crossovers in the chain
- How each component is powered (battery, distribution block, etc.)
Step 2: Use a prompt like this
Paste your equipment list into the AI assistant along with a prompt structured like this:
"I'm building a car audio system diagram for an EMMA competition submission. Here is my exact equipment list: [paste your list]. Please create a clear, labelled block diagram showing the full signal path from the head unit through to every speaker and subwoofer, including the DSP/amplifier channel each speaker is connected to. Use simple boxes and arrows, label every connection with the wire/channel it represents, and group speakers by location (front left, front right, rear, sub). Output it as an SVG or a clean HTML diagram I can save and print."
Step 3: Iterate on it
The first draft is rarely presentation-ready. Follow up with specific refinement prompts, for example:
"Make the front and rear channels visually grouped in separate boxes, add the amplifier's rated power per channel next to each connection, and add a small legend explaining the line styles."
Or:
"Add a title block at the top with my name, car make/model, and competition class, matching the kind of documentation header EMMA judges expect to see."
Step 4: Sanity-check it yourself
AI-generated diagrams are a genuinely useful starting point, but you built the system — not the AI. Check every channel assignment and speaker location against your actual install before you print it. A wrong diagram handed to a judge is worse than no diagram at all.
Once your diagram is sorted, make sure the rest of your documentation is in order too — see our guide on calculating your system's official value.