What does 'rack' mean?

A 'rack' is a standardised steel or aluminium frame used to mount electronic devices with a face width of 482.6 mm (19 inches). In event technology, a rack holds amplifiers, mixers, effect processors and power distributors on punched mounting rails. Vertical space inside a rack is measured in rack units (HE or U), where one unit equals 44.45 mm. Racks come as open steel frames, lockable steel cabinets, wall-mounted cabinets, swivel racks and mobile rack trolleys, each suited to a different installation scenario in studios, clubs, theatres and on stage.

What is the difference between a rack trolley and a steel cabinet?

A rack trolley is a steel frame – often fitted with castors – designed for semi-mobile, easily accessible 19" installations, whereas a steel cabinet is a fully enclosed housing with lockable doors for permanent, theft-proof setups. A rack trolley lets you reposition heavy gear within a venue and offers excellent airflow through its open construction. A steel cabinet, by contrast, encloses the equipment behind a safety-glass or mesh door, usually adds an integrated fan unit, and locks with a key. Choose a rack trolley for flexibility and a steel cabinet for security.

How many rack units (HE) do I need for my equipment?

To calculate the required rack units, add up the HE rating of every device you plan to mount, since one rack unit (HE) equals 44.45 mm of height. A power amplifier typically needs 1HE to 3HE, a rack mixer 1HE to 4HE and an effect unit around 1HE. After totalling your gear, add a buffer of 2 to 4 rack units for ventilation and future expansion. For example, if your devices sum to 12HE, choose a 16HE rack. This headroom prevents heat build-up and saves a costly upgrade later.

Are steel cabinets lockable and theft-proof?

Yes, steel cabinets are designed to be lockable and theft-proof, which is exactly why they suit clubs, theatres, schools and unattended venue installations. A typical steel cabinet features a key-lockable front door – often with safety glass so status LEDs stay visible – and a mesh rear door for airflow. The sheet-steel construction with powder coating resists forced entry far better than an open rack or a latched flightcase. For any equipment installed in a public or shared space, a lockable steel cabinet is the recommended, secure choice.

Which server rack manufacturers are there?

In the professional 19" segment stocked at LTT, established manufacturers include ROADINGER, OMNITRONIC, MONACOR and SHOWGEAR. ROADINGER supplies the popular SR-19 open steel racks from 4HE to 40HE and the lockable SSC steel cabinets with glass doors and fan units. OMNITRONIC offers swivel rack trolleys on castors for fixed installations, MONACOR provides compact wall cabinets such as the RACK-6WP, and SHOWGEAR delivers network-style cabinets with glass or mesh doors. All of these brands follow the 482.6 mm 19" standard, ensuring your equipment fits reliably.

What does a rack trolley or steel cabinet cost?

Prices for rack trolleys and steel cabinets depend mainly on height in rack units and whether the housing is open or lockable. At LTT, a compact 4HE open steel rack starts at around 119 €, while larger open racks up to 40HE reach roughly 400 €. Lockable steel cabinets with glass doors and integrated fan units typically range from about 300 € up to 950 € for the biggest 40HE models. Because steel racks are heavy, most ship as bulky goods with a freight surcharge, and free shipping applies from 69 €.

Which rack suits a permanent installation in a club or theatre?

For a permanent installation in a club or theatre, a lockable steel cabinet or a swivel rack is usually the best fit. A lockable steel cabinet protects expensive amplifiers and processors from unauthorised access during public events, and an integrated fan unit keeps the enclosed electronics cool. A swivel rack, with its pivoting upper section, makes rear-panel maintenance easy when the rack stands against a wall. Wall cabinets such as the MONACOR RACK-6WP save floor space in tight control rooms. Match the height in HE to your equipment plus a ventilation buffer.

How do I ensure proper ventilation in a rack?

Proper ventilation in a rack relies on airflow management and active cooling. Fit an integrated fan unit where amplifiers or effect processors run continuously, as these devices dissipate significant heat. Install blind panels over unused rack units so cool air is forced through the equipment rather than recirculating through empty gaps. Leave a 2 to 4 rack unit buffer when sizing the rack to allow air to move freely. In enclosed steel cabinets, keep vents and fan grilles dust-free, since accumulated dust reduces cooling efficiency and can lead to overheating.

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Rack Trolleys and Steel Cabinets at a Glance – Your Specialist for Event Technology: Rack trolleys and steel cabinets are the backbone of every stable 19" installation, keeping your amplifiers, mixers and effect processors protected, organised and ready to perform. At LTT you find robust powder-coated steel frames from 4HE up to 40HE, lockable glass-door cabinets and swivel racks for fixed installations in clubs, theatres and on stage.... Read more »

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