5426 Multicell Horn 3x4

This 3x4 multicellular horn (12 cells) is engineered to provide constant directivity and smooth, homogeneous sound dispersion. Its modular 2-piece design enables easy printing on standard build volumes while maintaining structural rigidity and acoustic decoupling.

GEOMETRY & ACOUSTIC EXPANSION

• Multicell Matrix : 12 independent cells (3 rows × 4 columns). This partitioning maintains controlled coverage across both horizontal and vertical axes, preventing high-frequency beaming.

• Expansion Profile : Calculated using exponential / Tractrix acoustic expansion formulas to optimize acoustic loading, extend low-end response, and minimize internal diffraction.

• Throat Adapter Transition : Smooth interior transition geometry bridging the circular driver exit to the 12-channel 3x4 cell matrix.

• Modular Assembly : Separated into two main components joined by bolted flange mounts:

  • Throat entry adapter with threaded driver mount and rear support foot.

  • Main 3x4 multicellular horn body with integrated mounting tabs at the mouth base.

TECHNICAL SPECIFICATIONS

• Type : Vertical sectoral multicellular horn (3 columns × 4 rows, 12 independent cells)

• Throat entry : 1 inch (25.4 mm) – direct or adapter compatible

• Acoustic cutoff frequency (fc) : ~750 Hz

• Recommended crossover frequency : 1,500 Hz (min. 1,350 Hz @ 24 dB/oct, 1,500 Hz @ 18 dB/oct)

• Nominal overall coverage (-6 dB) : 60° × 80° (H × V)

• Horizontal pattern : Controlled ~60° (narrow directivity avoiding lateral reflections)

• Vertical pattern : ~80° constant across the 1.5 kHz – 8 kHz range

• Dispersion geometry :

  • Inter-axis cell splay : ~18° to 20°

  • Individual cell flare angle : ~20°

• Recommended loading : 1" compression drivers with 1.4" to 1.75" diaphragms

• Overall Size : 350 × 320 × 300 mm

3D PRINTING & ASSEMBLY INSTRUCTIONS

• Material : PETG recommended for mechanical toughness, temperature resistance, and acoustic damping properties (PLA is also suitable).

• Layer Height : 0.16 mm to 0.20 mm (crucial for clean, precise 1-3/8"-18 TPI threads on the throat adapter).

• Perimeters / Wall Count : 4 to 6 walls minimum (ensures acoustic air-tightness and strengthens thread engagement).

• Infill Density : 25% to 40% (Gyroid or Cubic pattern) to add structural mass and damp resonant frequencies.

• Print Orientation : Print the throat adapter vertically (flange down) for optimal thread reproduction without support artifacts.