Eurorack Case article
Common Eurorack Case Mistakes to Avoid
The mistakes people make when setting up and using a eurorack case tend to cluster around a few predictable areas: underestimating size requirements, ignoring power planning, and mechanical errors during installation. Most are avoidable if you know about them in advance.
Buying Too Small
Buying a case that is too small is the single most common mistake and almost universal among first-time builders. A 42HP or 60HP skiff seems adequate when your initial module list is five or six items, but the Eurorack format is designed to be expanded, and module collections grow quickly. The cost of adding a second case — with its own power supply — is almost always higher than the cost difference between a 60HP and a 104HP case at the outset. Start with more space than you currently need.
Ignoring Power Draw Calculations
Every module has a current draw specification for the ±12V and +5V rails. Adding modules without tracking cumulative draw and comparing it to the power supply's rated output is how systems develop chronic noise problems or power-related instability. The correct approach is to add up all mA requirements across your current and planned modules, leave at least 20% headroom, and confirm the supply can handle it before buying. Using ModularGrid or a spreadsheet for this is easy and essential.
Reversing Power Connections
The power ribbon cable has a red stripe identifying the -12V conductor. This stripe must align with the -12V side of the module's power header — typically marked with a triangle, a notch or a label. Connecting it backwards supplies reverse polarity to the module, which can destroy components immediately. Most modern modules include reverse-polarity protection diodes, but many do not. Checking orientation every single time is the habit that prevents an expensive mistake.
Choosing a Poor Quality Power Supply
Entry-level eurorack cases sometimes ship with underpowered or electrically noisy supplies. A noisy supply contaminates every module in the system with an audible hum or high-frequency interference in the signal path. If a deal on a case seems too good, the supply is likely the compromise. Replacing a supply later is possible but adds cost and complexity. Paying slightly more for a system from a manufacturer known for power quality — Intellijel, Make Noise, Tiptop Audio — is more efficient than troubleshooting a noise problem after the fact.
Over-tightening Module Screws
Module panels are typically thin aluminium. Over-tightening the M3 mounting screws strips the screw hole or bends the panel. Finger-tight plus a quarter turn is generally sufficient. The module is not going anywhere once the rail nut is engaged — it does not need to be clamped down. This is a small mechanical point but consistently damages panels in ways that are obvious and irreversible. For a full guide to choosing the right rack for your needs, see the buyer's guide. The beginner's guide covers safe setup and first use.
Comments