HPM Horn – Dedicated Midrange Solution

The HPM horn is a dedicated midrange solution designed to meet both high SPL requirements and constant directivity behavior.

To achieve this objective while maximizing output, we developed a direct-coupling throat. This design captures the wavefront directly at the surface of the cone midrange, eliminating the air impedance mismatch between the region just before the throat and the traditional slot. Such mismatches can create response irregularities and SPL loss in the upper half of the horn’s operating range.

When paired with MX-Shape or X-Shape waveguides in 1.4" or 1.5" formats, the system delivers very high output in the 300 Hz to 1000 Hz range, with an on-demand constant-directivity pattern depending.

For the kick-bass range, between subwoofers and the midrange section, we recommend a solution similar to the Peavey FH-1 kick horn enclosure.

The Throat

HPM applies the MX-Shape design philosophy to the midrange, extending X-Shape technology to the mid band.

The HPM is supplied as a custom throat, individually designed and simulated using FEA for each specific driver. A STEP file is provided for the wooden horn section that mates with the printed throat.

Because every application has unique requirements, HPM is offered as a custom solution and include a consulting phase.

The 18Sound 10NMBA520 is recommended, although HPM can be designed for other midrange drivers.

Client Implementation Example

Below is an example of an implementation using a JBL CMCD midrange compression driver.

In this case, the direct-coupling throat component is not used, as the CMCD already incorporates an integrated phase plug.

Measurement

SPL

Typical response of the 1 m wide HPM with JBL CMCD:

Directivity

In progress.

MX-Shape line up

The MX-Shape horn is designed modular approach based on X-Shape technology.

This innovative horn features a modular design for easier shipping and customization.

For OEM the throat (PLA or MJF, 1.4" or 1.5") comes in various options, while the profile can be sent as a digital plan, this allows for customization of the horn width (30cm to 200cm) without affecting price.

For DIY, all parts are manufactured at AudioHorn, the price is depending of size and choosen material, Walnut or Birch Plywood.

Available with different coverage angles:

90*60
80*60
80*50
70*50
60*40

Versions and price :

: To order you can discover our horn versions and prices bellow then contact us here to proceed to payment and worldwide shipment.

On demand size and finish:

Birch Plywood Varnish

Birch Plywood Oil + Wax

US Walnut Varnish

US Walnut Oil + Wax

Printed Throat PLA or MJF
Size and Price on demand
Round-over for free standing usage

Includes AudioHorn consulting for horn design and compression driver selection tailored to your application
Raw throat (matte black PLA or PETG-CF): €380 per unit
Profile plan (STEP file): €180
Fully machined wooden horn profile with delivery: price on request

Measurement

Here is the measurement for a 50cm version :

Measurements are from 300hz to 20kHz, with a 18Sound ND3T, the accident in HF is due to Ti diaphragm breakup, not to the horn.

Horizontal:

Vertical:

Response (grey) and DI (red):

Compared with other solutions like JBL 2360, HP9040, Manta-Ray horn or first generation “CD” horns

We can compare it with some other big full range horn like the JBL 2360A or JBL 2365A.

The JBL 2360A was the last big representative in date of the big familly of Manta-Ray horn then Quadratic-wave and “CD” diffraction horns.

We can see midrange narrowing on this 2360, a lot of midrange beaming too and diffractions (dark red) from 1 to 15 Khz. All theses defaults aren’t present on MX-Shape.

RX-Shape horns are the rounded free-standing evolution of the X-Shape concept.

They retain all the acoustic qualities, loading behavior, and constant directivity performance of the X-Shape, now optimized for free-standing use.

RX-Shape are designed for free-standing mounting, making them extremely simple to use.

They can be directly placed on top of a conventional loudspeaker cabinet, aligned with a mid-woofer below, without requiring a front baffle cut-out, round-over machining, or complex integration work.

The RX-Shape horn is only available for DIY projects.

We recommend using the specified width of the supporting cabinet to ensure perfect directivity matching.

A cabinet that is too wide will interfere with the natural directivity of the woofer, while a properly proportioned cabinet reinforces low‑mid directivity, ensuring a smooth directivity match with the RX-Shape horn above, without requiring woofer front baffle round-over.

Our directivity match article explains how intentionally placing midrange narrowing on a woofer cabinet will reinforce the woofer’s natural directivity, improving the transition to the horn.

Horns and their Polar plot

: To order, discover our RX horn versions below, then contact us here to proceed to payment and worldwide shipment.

All measurements are identical to the corresponding X-Shape equivalent models, performed with the ideal simulated return, taken at 1/24 resolution in a half-space presentation (±90°).

Select Horn:

RX-Shape 25 for 1" compression driver and 8/9.5" woofer

Specifications:
- Width: 30.7cm
- Height: 21.3cm
- Deep: 14.2cm
- Horizontal constant coverage: 90°
- Vertical constant coverage: 60°
- Recommended crossover: 1200Hz
- Recommended cabinet width: 32cm, 4mm roundover

PLA Printed Price: 195€/U
PETG-CF Printed Price: 265€/U

Recommended compression driver:
- 18Sound ND1TP-16 / 1095N / 1090
- BMS 5530-16

Horizontal Polar:

Vertical Polar:

SPL

1": RX 25 and RX 28 with 18Sound ND1090
1.4": RX 34 with 18Sound ND1460