TH-4003-NG, recalculated and optimised TH-4003

Legacy : replaced by M-Shape

History and Usage

The TH-4003 is the king of in-room long range listening distance, generally in-wall or inside huge system.

It’s a specific 1.5" horn design for the TD-4003, the best beryllium driver.

The coverage is 80° by 30° and the surface law an Hypex 0.7 with a simple relatively constant side walls.

It has been designed for Cinema with bleacher, it’s the reason why the vertical bottom coverage is not the same that the top one, TAD call it APAXIAL.

The picture is the last HC room of Roland Delacroix, one of the worldwide expert in private hi-end cinema. He uses a custom TH-4003 with a TD-4003.

The first line of seats is at 9m (30 feet) and last one at 20m (60 feet) distance. The TH4003 is in a very large horn system design for in-room very long distance with high SPL.

Description

We have developed a model that allows to generate TH-4003, and we have taken the advantage to optimise some aspect :

• The original side walls with throat flare and mouth flare have been improved and the constant directivity pattern push to 14kHz

• We make it flat for optimising mouth diffraction in-wall. But if necessary we can propose it with a cylinder mouth on demand, we advise to stay flat, a complete reverse round-over is added if not.

• He is Apaxial as the original, meaning that the vertical top and vertical bottom coverage are not the same, it’s a behavior that can be keep or skip on demand.

• The width can be chosen on demand according to Fc, the Fc is by default the original value so 350hz, you can change for your application

• Any throat size is available, even 8" for the JBL CMCD

• The horizontal coverages are 80° or 70° on demand.

An Apaxial TH4003 NG with a throat optimisation :

Usage and dimensions:

The default Fc is still 350hz and the dimensions are close (62cm width), with a recommended 700hz cross-over for high level SPL application.

Mounting in-wall or in-box medium/long distance. As for the original TH-4003, it’s designed for more than 5/6m (16/20 feet), with 1.4 or 1.5" drivers mainly.
It can load everything that is a plane wave radiation device, so even a JBL CMCD 8" in a 3 ways system for a very long distance usage, after 10m (30 feet).

For medium distance the Bi-radial horn will be better thanks to a 90° coverage angle and a specifics energy distribution inside this coverage.