About Kahlenberg UK

Kahlenberg UK Ltd is the European distributor for Kahlenberg Industries, Inc. providing full European support and local stock for Kahlenberg marine and industrial air horns, sound signals, controllers, air compressors and the company's other products.

Please contact us for further assistance at or on +44 (0)1635 35353

Sound signal legal requirements

IMO COLREGs bookWhile countries across Europe will have local laws that apply to ship and boat navigation, there is a common requirement worldwide for all leisure, commercial and military vessels to conform to the IMO International Regulations for Preventing Collisions at Sea. As Steve Austin, Senior Policy Lead at the UK Maritime & Coastguard Agency (MCA) explains: "The COLREGs apply to all vessels, there is no differentiation between coded and non-coded vessels. Should the whistles prove not to conform then they will need to be modified or changed."

"Whistles should conform to the performance in COLREGs, Appendix III and the appropriate parts of IEC 60945 to EN60945 which deal with the marine operating environment."

All Kahlenberg products meet or exceed these requirements. Many other new and currently installed sound signals are non-compliant and might be breaching maritime law and invalidating insurance cover.

D-330 marine air horn

Kahlenberg D-330 twin trumpet yacht hornThe Kahlenberg D-330 twin trumpet air horn provides remarkable IMO certified performance for vessels up to 75m (246ft) in length, in a lightweight and compact package.

This size also means that it requires a very modest ait supply, making minimal demand on onboard systems or requiring a very small standalone compressor set.

The Kahlenberg D-330 marine air horn can be supplied in a variety of finishes including Kahlenberg's durable chrome plate, TGIC sky white powder coat, or gold or black chrome PVD.


D-330 air horn specification

The D-330 is constructed from cast bronze and spun brass; it uses triple plating in its chrome version for durability and brilliant appearance.

Fundamental frequencies for this marine air horn are 330Hz and 322Hz and it produces a sound pressure level (SPL) of 133 dB (1/3 Octave @ 1m).

This horn is relatively miserly on air, typically 18CFM at 100psi (8.4l/s at 7bar). it can operate over a wide range of pressure between 50-200psi (3.5-14bar). It can also deal with higher pressures via the use of optional regulators.

Dimensions are 524mm x 394mm x 217mm (20.5in x 15.5n x 8.5in) and it has a net weight of 4.3kg (9lb).

The recommended compressor unit is the Kahlenberg P449-25 24V DC or P449-26 12V DC Compressor Tank Kit. other options can be considered.

Kahlenberg KB-30 electronic horn/hailer system downloads

Kahlenberg D-330 Marine Air Horn brochure

Kahlenberg D-330 Marine Air Horn technical drawing

Listen to the Kahlenberg Chimetone D-1 Air Horn

Further information

Call Kahlenberg UK now on +44 (0)1635 35353 or email