rTrak horns are used when wide horizontal coverage is a deliberate design goal.
The radial geometry distributes acoustic energy primarily in the horizontal plane, allowing larger listening zones or multiple listening positions to be covered — without additional vanes, diffusers, or complex constant-directivity structures.
rTrak horns are designed for applications where multiple listening positions or larger monitoring areas need to be served evenly.
Typical applications include:
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Systems requiring wide horizontal coverage
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Setups with multiple listening positions side by side
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Configurations with greater listening distances
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Projects where uniform horizontal energy distribution is more important than tight on-axis directivity
This clearly distinguishes rTrak from rotationally symmetric tractrix profiles, which prioritize stronger beaming and maximum on-axis directness.
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CNC-precision machined
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High efficiency, suitable even for low-power amplifiers
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Flexible driver interface options
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OEM configuration available
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Various horizontal dispersion angles available
Acoustics & Geometry
The radial horn geometry of rTrak is designed so that sound energy can spread more freely in the horizontal plane than with rotationally symmetric profiles.
This results in:
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Wider horizontal dispersion angles in the relevant operating range
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More even coverage of laterally offset listening positions
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Less pronounced “sweet-spot fixation”
rTrak deliberately does not follow a constant-directivity approach.
The dispersion angle is not held constant across the entire frequency band; instead, it follows a practical, frequency-dependent directivity that is simple, robust, and efficient to realize from a construction standpoint.
Material & Manufacturing
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CNC-machined from beech or birch multiplex. Solid wood by arrangement.
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Mechanically inert wall structure with high internal damping.
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High repeatability for series production and OEM projects.
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Manual final inspection and surface finishing.
Integration & Interface
Driver coupling is realized via an integrated, clean adapter geometry, ensuring a smooth transition from the driver into the horn.
Interface options (model-dependent):
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1″
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1.5″
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2″
Project-specific custom solutions are possible following technical evaluation.
Woods & Finishes
Structural Wood
rTrak horns are based on dimensionally stable beech or birch multiplex.
This material offers uniform density, high dimensional accuracy, and excellent mechanical damping — essential for a mechanically calm horn body without unwanted structural resonances.
For rTrak horns, multiplex is structurally superior, as it absorbs internal stresses in a controlled manner and remains dimensionally stable even under changing climatic conditions.
Solid wood is available for project-specific applications at any time.
For this purpose, we have built a dedicated sourcing network over many years to ensure the highest material quality.
Surface & Finish
Hardwax oil (standard)
Open-pore, honest, acoustically unobtrusive
Stain (optional)
Color accentuation while preserving the natural wood structure
Lacquer finish (on request)
Only when clearly required by the project
No foils.
No veneer simulation.
No industrial surface make-up.
At LMH, the surface is part of the construction — not decoration.
Sizes
Our rTrak horns are available with mouth diameters ranging from 20 cm up to 120 cm.
Custom sizes are available at any time.
View available sizes...
rTrak horns are classified by cutoff frequency (Cf).
The cutoff is a design reference for the horn’s lower operating limit.
Practical guideline:
The crossover frequency should be set above approx. 1.5 × Cf, depending on the driver used and the filter slope.
| Version (Cf) | Approx. width | Approx. height | Approx. depth | Approx. weight |
|---|---|---|---|---|
| 140 Hz | 105 cm | 35 cm | 71 cm | 46 kg |
| 170 Hz | 95 cm | 30 cm | 62 cm | 38 kg |
| 200 Hz | 80 cm | 30 cm | 54 cm | 22 kg |
| 300 Hz | 60 cm | 23.5 cm | 46 cm | 16 kg |
| 400 Hz | 50 cm | 23.5 cm | 38 cm | 11 kg |
| 500 Hz | 40 cm | 17.5 cm | 30 cm | 8 kg |
| 600 Hz | 30 cm | 16.5 cm | 23 cm | 4.5 kg |
| 750 Hz | 25 cm | 15 cm | 18 cm | 3 kg |
| 1000 Hz | 20 cm | 15 cm | 15 cm | 2 kg |
