The Stium is an extremely powerful medium high frequency system and can be used as an FOH solution for 300 to 3,000 people


  • • FOH system for audiences of 300 - 3,000 people
  • • Sidefill / Outfill / Infill / Drumfill for big stages
  • • Fixed installation
  • • highly efficient, fully horn loaded loudspeaker system
  • • fully usable from 100Hz upwards, SPLmax >140dB

Loudspeaker system Stium

With the release of the AD-Systems Stium we satisfy our customers demand for a compact, very powerful horn loaded MF/HF loudspeaker system suiting well to the day-to-day rental business needs. The Stium closes the gap between compact systems and line arrays and recommends itself always when high SPL is necessary, but the use of a line array is economically or acoustically inappropriate. Well… and it does away with lots of negative attributes associated with traditional horn designs.

The AD-Systems Stium is an very compact, horn loaded fullrange loudspeaker system incorporating two 12“ neodymium low-mid speakers and a high resolution 1.4“ high frequency compression driver. Thanks to its acoustic design it is capable to generate sound pressure levels in excess of 140dB with low distortion. Compared to traditional designs this unit reaches a very low cutoff  frequency of 100Hz and so can be used together with any common subwoofer system. Its nominal coverage pattern is 75° x 50°, but the high frequency horn is rotatable by 90° to get a 50° x 75° pattern. The loudspeaker incorporates a passive crossover and has a net weight of just 42 kilogrammes – features which make the Stium a highly economic and flexible product.

Designed for semi-active operation

Corresponding with a high performance system of its class the AD-Systems Stium is layed out as semi-active system, i.e. a complex, passive 2.5-way crossover provides phase coherent combination of both ways as well as a specifically optimized coverage pattern, while equalizing and speaker protection is provided by the AD-Systems Impuls series DSP amplifiers. That‘s why powering of the Stium requires only one amplifier channel.

The handling of the slender, polyurea coated enclosure is pleasantly easy due to the well placed handles on both sides. The available accessories round the systems concept perfectly off: The Quick-Rig flying bar is mounted within seconds and enables easy set up due to the optimally matched pivot point. The detachable front board as well as the padded transport cover protect from dirt and rough handling effectively.

First choice with maximum profitability

The Stium is the preferred choice for applications, where maximum profitability meets high sound pressure requirements. Its decent shape and ease of use, its low crossover capability and its remarkable output-to-weight ratio lead to a uniquely versatile system.


• FOH system for audiences of 300 – 3,000 people
• Sidefill / Outfill / Infill / Drumfill for big stages
• Fully usable from 100Hz upwards, SPLmax >140dB
• Highly efficient, fully horn loaded loudspeaker system


• 2 x 12“ Neodym low mid woofer with 3“ voice coil
• 1.4“ Neodym compression driver with 3.0“ VC
• 15 mm heavily braced Baltic birch polywood with Polyurea coating
• Power handling RMS: 750 W RMS | 3.000 W Peak

More speakers from our Touring series

Get an overview of other AD-Systems loudspeaker systems. If you have any questions, please do not hesitate to contact us. Actual prices for the Stium and the current product catalog are available on request.

• Product overview of our Touring spea

15 mm baltic birch polywood with Polyurea coating
Basic layout
2.5-Way passive, horn and reflex loaded
Protective Grille
2.0 mm sheet steel, hex-stamped, black acoustic foam on inside
2x12“ ND low mid woofer with 3“ VC
1.4“ ND compression driver with 3.0“ VC
on 75°x 50° BEM CD-Horn passive crossover with phase correction
Frequency Response
100 Hz–18 kHz +/-3 dB
Power handling RMS | peak
750 W RMS | 3.000 W Peak
Nominal Impedance
6 Ω
Dispersion pattern
75° x 50° constant coverage
108 dB Lo-Mids, 111 dB High
143 dB | peak | 1 m
NL4: 1+/1-
Dimensions (w x h x d)
450 x 1020 x 420 mm
net weight
44,5 kg
Technical drawing of the STIUM loudspeaker system

ST – Padded Cover

Padded loudspeaker cover (Polyester) with AD-System imprint. Order number: 7011000820

ST – Vertical Bracket

Vertical mounting bracket for loudspeaker systems. Weight: 11.5 kg. Order number: 7011000818

ST – Front Protector

The transport cover protects the loudspeaker grille during transport and assembly. The cover is equipped with butterfly clasps and can be securely connected to the housing. Also available as wheelboard with "blue wheel" swivel castors. Order number: 7011000819