Pure Resonance Audio SD4 SuperDispersion 360° 70V Ceiling Speaker Array

360° Ceiling Coverage from a Single 2×2 Speaker Array

The Pure Resonance Audio SD4 SuperDispersion ceiling speaker array is designed for spaces that need broad, even overhead coverage for music, paging, and announcements without using numerous conventional ceiling speakers.

Its four-driver array produces a 360° × 180° hemispherical coverage pattern and fits directly into standard 2×2 or 2×4 suspended-ceiling grids.

Key Specifications

• Product type: Passive SuperDispersion drop-ceiling speaker array
• Sold as: Single speaker array
• Driver array: 4 × 6.5" aluminum coaxial drivers
• Power handling: 160W RMS
• Frequency response: 45Hz–20kHz
• Sensitivity: 92dB, half-space
• Coverage: 360° × 180° hemispherical
• Approximate coverage area: Up to about 30' × 30', application dependent
• 70V taps: 4W, 8W, 16W, 32W, 64W
• Low-impedance mode: 8-ohm bypass
• Installation: Standard 2×2 or 2×4 drop-ceiling grid

Who Should Choose the SD4?

Choose the SD4 when you need wide overhead coverage in classrooms, offices, restaurants, retail spaces, houses of worship, meeting rooms, gyms, public areas, or other spaces with suspended ceilings.

Its wide dispersion can reduce the number of speaker locations required compared with conventional narrow-coverage ceiling speakers, depending on the room and required listening level.

Four 6.5-Inch Driver SuperDispersion Array

The SD4 uses four matched 6.5" aluminum coaxial drivers arranged around a truncated-pyramid enclosure. The drivers work together to distribute sound outward in multiple directions rather than concentrating coverage directly beneath the speaker.

Pure Resonance Audio specifies a 360° horizontal × 180° hemispherical dispersion pattern.

Up to Approximately 30 × 30 Feet of Coverage

Pure Resonance Audio states that one SD4 can generally cover approximately a 30' × 30' area, or about 900 square feet, depending on room acoustics, mounting height, background noise, and required listening level.

This should be treated as a planning guideline rather than a guaranteed coverage area for every installation.

160W RMS Power Handling

The SD4 is rated for 160W RMS power handling and has 92dB sensitivity.

The SD4 is passive and requires a compatible external amplifier. The 160W figure describes speaker power handling, not built-in amplifier output.

70V Distributed-Audio Compatibility

The built-in transformer provides selectable 70V taps of 4W, 8W, 16W, 32W, and 64W.

When using multiple SD4 speakers on a 70V amplifier, add the selected tap wattages and allow appropriate amplifier headroom.

8-Ohm Bypass

The SD4 also provides an 8-ohm bypass for use with compatible low-impedance amplifiers.

This makes the speaker suitable for either a 70V distributed-audio system or an appropriately designed conventional 8-ohm system.

45Hz–20kHz Frequency Response

Pure Resonance Audio specifies a 45Hz–20kHz frequency response, allowing the SD4 to support both spoken-word paging and fuller music reproduction than many small ceiling speakers.

Drop-In 2×2 Ceiling Installation

The SD4 measures approximately 23.8" × 23.8" and is designed to replace a standard ceiling tile in a 2×2 or 2×4 suspended-ceiling grid.

No conventional circular speaker cutout is required. Remove the ceiling tile, place the SD4 into the grid, connect the speaker wire, and secure the included safety cables according to applicable installation requirements.

Shallow Backbox

• Overall dimensions: 23.8" × 23.8" × 5.8"
• Backbox depth: 2.8"
• Net weight: 25 lb

The shallow upper enclosure can help in suspended ceilings with limited plenum clearance, but always confirm available space and local installation requirements before installation.

What's Included?

• 1 Pure Resonance Audio SD4 SuperDispersion speaker array
• 4 steel safety cables
• 4 carabiners
• 4 Fastlinks

Amplifier, speaker wire, and additional installation hardware are sold separately.

Complete Your Distributed Audio System

• Pure Resonance Audio
• Audio Amplifiers
• Speaker Wire

Need Help Planning Coverage?

Send Bear Security Shop your room dimensions, ceiling height, speaker quantity, and amplifier model. We can help determine whether the SD4 coverage pattern and 70V tap settings fit your system.

Is the Pure Resonance Audio SD4 sold individually?

Yes. Each SD4 is sold as one complete ceiling speaker array.

How many drivers does the SD4 use?

The SD4 uses four matched 6.5" aluminum coaxial drivers arranged in a SuperDispersion array.

What is the coverage pattern?

Pure Resonance Audio specifies 360° horizontal by 180° hemispherical coverage.

How much area can one SD4 cover?

Pure Resonance Audio states that one SD4 can generally cover approximately 30' × 30', or about 900 square feet. Actual coverage depends on the room, ceiling height, background noise, and required listening level.

Does the SD4 support 70V systems?

Yes. Available 70V transformer taps are 4W, 8W, 16W, 32W, and 64W.

Does the SD4 support 100V systems?

The current manufacturer specification lists 70V transformer operation and an 8-ohm bypass. It does not publish 100V taps for the SD4.

Can I use the SD4 with an 8-ohm amplifier?

Yes. The built-in transformer includes an 8-ohm bypass for compatible low-impedance amplifiers.

What is the SD4 power handling?

Pure Resonance Audio specifies 160W RMS power handling.

What is the frequency response?

The current manufacturer specification is 45Hz–20kHz.

Does the SD4 need an external amplifier?

Yes. The SD4 is a passive speaker and requires a compatible 70V or 8-ohm amplifier.

Does it fit a standard drop ceiling?

Yes. The SD4 is designed to lay into standard 2×2 or 2×4 suspended-ceiling grids.

Are safety cables included?

Yes. The package includes four steel safety cables, four carabiners, and four Fastlinks.