Build an airflow path
Identify the intake and exhaust direction of every component. Some amplifiers move air front-to-rear; others rear-to-front or side-to-side; passive products rely on convection. Mixing directions carelessly can feed one amplifier with another’s exhaust.
Provide a cool-air entry and a route for warm air to leave the room or cabinet. A fan circulating the same hot air inside a sealed joinery cavity does not solve the problem.
Estimate the heat load
Power drawn from the mains becomes audio output plus heat. Idle consumption matters in always-on racks, while sustained programme and low-impedance loads raise dissipation. Class D is usually more efficient, but a dense chassis can still create local hot spots.
Use manufacturer dissipation data when available and consider the room’s ambient temperature. Cooling equipment also needs maintenance capacity and acceptable noise.
Rack layout details
Follow clearance instructions and keep vents unobstructed. Heavy amplifiers need suitable shelves, rails and rack loading. Separate high-heat products when recommended, keep cable bundles away from exhausts and leave access for filter cleaning and service.
Commission and monitor
Measure intake and exhaust temperatures during a sustained, representative test with the rack closed as it will be used. Confirm fans change speed normally and that no amplifier enters thermal protection. Recheck after filters accumulate dust and after the system is expanded.
Specification checklist
Before you decide
- Record airflow direction for every chassis.
- Provide defined intake and exhaust routes.
- Use manufacturer clearances and ambient limits.
- Support heavy equipment correctly.
- Test temperature with doors and panels fitted.
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