Atlas Sound CD42 – 40°x20° Constant Directivity Paging Horn

Product Overview

The Atlas Sound CD42 is a constant directivity re-entrant paging horn delivering a controlled 40° horizontal by 20° vertical coverage pattern across a wide frequency range. Designed for large-area indoor and outdoor paging applications, this constant directivity horn speaker provides the predictable beamwidth control that conical horn designs cannot match — making it the preferred choice for facilities requiring consistent, intelligible voice coverage in large open spaces, stadiums, or industrial environments. The CD42 pairs with AtlasIED PD30, PD-5, and PD60 series compression drivers to form a complete, high-SPL paging assembly.

Product Description

Unlike conical horn designs that exhibit narrowing dispersion as frequency increases, the CD42 uses a constant directivity architecture to maintain its nominal 40° x 20° coverage pattern across its 800Hz–10kHz operating band. This controlled dispersion is critical in paging and mass notification applications where uniform SPL across the coverage area is required for voice intelligibility. When paired with the PD60 compression driver, the CD42 delivers 113dB SPL (1W/1M), making it capable of penetrating ambient noise in industrial, outdoor, or large auditorium environments. The low-frequency cutoff of 300Hz and nominal response of 800Hz–10kHz positions this horn squarely for voice paging and signaling systems rather than full-range music reproduction. Construction combines polyester resin and glass-fiber laminate with a die-cast zinc throat section, providing weather-resistant durability for outdoor installations. The CD42 accepts Atlas Sound and third-party compression drivers with 1-3/8”-18 thread and 0.7” diameter throat openings. A heavy-duty CJ46-style steel mounting bracket provides secure attachment with positive lock for horizontal and vertical positioning. The patented 180° gimbal mount allows the installer to aim the horn precisely without compromising structural integrity. Multi-unit cluster mounting is also supported for high-SPL applications requiring increased coverage area. These characteristics make the CD42 well suited for outdoor venues, warehouses, auditoriums, and house of worship installations where long-throw, directional paging coverage is required.

Key Features

• 40° x 20° Constant Directivity Pattern — Maintains horizontal 40° (±10°) and vertical 20° (±10°) coverage from 800Hz through 10kHz for predictable, consistent sound distribution.
• 113dB SPL (1W/1M) with PD60 Driver — High sensitivity rating enables broad coverage from moderate amplifier power levels.
• Nominal Response 800Hz–10kHz — Optimized for voice intelligibility and signaling in paging and mass notification systems.
• Weather-Resistant Construction — Polyester resin and glass-fiber laminate body with die-cast zinc throat withstands outdoor and harsh indoor environments.
• Patented 180° Gimbal Mount — Allows precise vertical and horizontal aiming during installation without disassembly.
• Heavy-Duty CJ46-Style Bracket — Positive-lock steel mounting bracket supports single and multi-unit cluster configurations.
• Compatible with Standard Compression Drivers — Accepts drivers with 1-3/8”-18 thread and 0.7” throat diameter, including AtlasIED PD30, PD-5, and PD60 series.

Typical Applications

• House of worship
• Auditorium
• Government space
• Multi-purpose room
• Broadcast studio

Technical Specifications

Frequently Asked Questions

Q: Which compression drivers are compatible with the CD42?

A: The CD42 accepts any compression driver with a 1-3/8”-18 thread and 0.7” diameter throat opening. AtlasIED recommends the PD30, PD-5, or PD60 series drivers for optimal performance.

Q: Can the CD42 be used outdoors?

A: Yes. The polyester resin and glass-fiber laminate construction with die-cast zinc throat makes the CD42 environment-resistant and suitable for outdoor paging applications.

Q: What is the benefit of constant directivity versus a standard conical horn?

A: A constant directivity horn maintains its stated coverage angle across a wide frequency range. Standard conical horns progressively narrow as frequency increases, resulting in uneven coverage with hot spots directly on-axis and poor intelligibility at the edges of the pattern.

Q: Can multiple CD42 units be clustered together for higher SPL?

A: Yes. The CJ46-style mounting bracket supports stacked multi-unit cluster configurations, allowing installers to increase total SPL output for large outdoor or high-ambient-noise environments.

Q: What amplifier power is needed to drive the CD42 effectively?

A: With a sensitivity of 113dB (1W/1M) using the PD60 driver, even moderate amplifier power levels can produce high SPL at distance. The required power depends on the coverage distance and target SPL; consult AtlasIED system design resources for specific calculations.