HPM, High Powerful Midrange Horn
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
