Issue 26



2 March 2015

Founded in 1926, Tannoy is one of the oldest loudspeaker companies in the world and a brand that is synonymous with sound – its pre-war horn technology became such a part of everyday life that the phrase ‘over the Tannoy’ entered the Oxford Dictionary to describe a public address system. Its latest product, debuted at ISE 2015, marks a return to earlier days and takes its horn heritage to a whole new area of application.

RS9815_Tunnel speaker3Q Goff crop


The Tannoy THL-1 tunnel loudspeaker provides a robust, cost-effective solution for Emergency Voice Alarm/Communication (EVAC) systems in the physically and acoustically hostile environment of road tunnels.

In an application notorious for high ambient noise levels and excessive reverberation, the speaker transmits crisp, controlled and intelligible voice announcements throughout the space from a minimum number of loudspeaker locations, Tannoy says, and is built to withstand corrosive atmospheric contaminants, high moisture levels and temperature extremes.

To project an effective voice alarm notice over distances up to 50m, the THL-1 incorporates an asymmetrical AFEX (Architectural Flare Extension) horn which leverages the acoustical properties of the tunnel wall to effectively extend the waveguide effect for greater directivity and increased propagation along the horn axis.

The THL-1 is designed to withstand the rigors of long-term exposure to harsh environments, and also to function reliably even in proximity to catastrophic fire and explosive events. Cable entry to the driver/transformer housing is tightly sealed by rubber grommets, and an AirNet backing behind the stainless steel grille prevents moisture ingress to the horn. The AFEX horn is constructed from thick, fire-retardant, multi-layer fiberglass to DIN4102 Class B standard. The ceramic cable connectors are rated to withstand temperatures to 600°C. To facilitate confidence testing at regular intervals as well as during emergencies, the speaker accommodates fault monitoring (in conjunction with external equipment) to the EN 54 standard.

The THL-1 installs quickly and securely using six mounting holes for fixing to threaded rods or bolts attached to the tunnel soffit or unistrut.


Source: media release


Tannoy Professional:

Australian distribution
Audio Products Group: (02) 9669 3477 or


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