The bass reflex loudspeaker i.Flex18B has an 18 inch long stroke loudspeaker


  • • Fixed installation for any kind of PA System
  • • Sub and Lo Extension for all kind of speakers

18″ Subwoofer

The i.Flex18B is a bass-reflex system and was specially designed to be combined with the other models of the AD-Systems i.flex-Series. It extends the frequency range of the i.flex models to 38 Hz and withstands continuous power of 3,200 Watt (peak).

The subwoofer has powerful, low distortion features and offers natural reproduction. It is designed for use with an external active crossover. The enclosure is made from birch plywood and is painted impact-proof. The front is protected by a rugged grille. It is also covered with interchangeable acoustic foam.


• Fixed installation for any kind of PA System
• Sub- and Lo Extension for all kind of speakers


• 18″ long-excursion woofer with 4″ voice coil
• Power handling: 800 Watts RMS | 3,200 Watts Peak
• 2x Neutrik Speakon NL4: 2+/2-
• Colour: Black, similar RAL 9005
• Optional colours: RAL or NCS

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See other speakers from the i.Flex-Series

Get an overview of other subwoofer solutions from our AD-Systems. If you have any questions, please do not hesitate to contact us. Current prices for the i.Flex18B subwoofer as well as the current product catalog are available on request.

15 mm birch plywood with structure paint
Basic layout
bass-reflex tuning
Protective Grille
1.5 mm grille, covered with acoustic foam
18“ long-excursion woofer with 4“ voice coil
Frequency Response
38 Hz–250 Hz
Power handling RMS | peak
800 Watt RMS | 3,200 Watt Peak
Nominal Impedance
8 Ω
Dispersion pattern
96 dB
132 dB I peak I 1m
2x Neutrik Speakon NL4: 2+/2-
Dimensions (w x h x d)
500 x 600 x 700 mm
net weight
38 kg

iFlex18B – Accessories

Optional equipment: 70/100 Volt ELA-Technic, Outdoor Finish, RAL/NCS Colours