A customer sets a pedalboard on the counter and points to the one empty space. The new effect will fit. The remaining power lead reaches. That still leaves the question that can undo the sale: Is that lead suitable for this pedal?
A useful demonstration starts with the board the customer already owns. Ask for the power supply model and the exact pedals, including any that spend most of the set switched off. A bypassed pedal may still be drawing power. A photo of the underside of the board can settle more than a description of the box on top.
Read the label before making the connection
For each pedal, establish the required voltage, AC or DC, polarity, connector dimensions and current requirement from its label and manual. Then identify the particular output on the supply. A plug sliding into a socket proves only that it slides into the socket.
Higher current capacity and higher voltage are different propositions. A compatible supply can offer more current than a pedal requires; extra voltage is acceptable only when the pedal's documentation permits it. Do not try an undocumented voltage change to see whether the sound improves. For an unfamiliar or older unit, stop at the manual or the manufacturer's support desk.
Make a simple map: pedal, requirement, assigned output. Put the supply's output limits beside it. For a shared output, add the connected pedals' specified current requirements and check the applicable limit. Also check any total or grouped limits in the supply manual. An unused socket does not establish that capacity remains available.
Hear the board the customer will take home
A single pedal working on the demonstration bench is a useful first check. Follow it with the intended board, amplifier and working cables. Listen with effects bypassed and engaged, then try the combinations the player actually uses. Include the quiet passage between songs; a problem can be easier to hear there than under a sustained distorted chord.
If unwanted noise appears, return to a known working arrangement and change one connection at a time. Where the manufacturer allows it, compare the suspect pedal on its recommended separate supply. Avoid promising that an isolated supply will cure every hum: signal routing, cables and other equipment still need examination. Never defeat a mains safety earth to quiet a board.
The power question is also a fitting question. Can the connector clear the next pedal? Does a right-angle plug block another socket? Can the supply mount securely without obstructing a foot or trapping a lead? Check those details before cutting mounting material or quoting a finished installation.
Sell the installation the quote describes
Separate a supply-only sale from a rewired and tested board. If staff will install it, record the agreed layout, supplied cables and work included. Photograph the finished connections and label any output whose setting must stay where it is. Give the customer the map rather than expecting them to remember a hurried explanation at pickup.
Leave a line for the next pedal. The next purchase may need a different voltage, more current or a separate supply; today's spare lead is not a standing promise. A board that leaves the store with a readable power plan gives the player a way to ask the next question before plugging anything in.
At the counter
- Identify every pedal and the exact supply.
- Map voltage, AC/DC, polarity, connector and current to each output.
- Check shared, grouped and total limits in the supply manual.
- Listen to the complete board and photograph the finished wiring.