Martin Audio CDD8TBX – 8" 70V/100V Transformer Speaker (Black)

Product Overview

The Martin Audio CDD8TBX is an ultra-compact, transformer-coupled 70V/100V distributed loudspeaker designed for commercial zone audio installations where space constraints and architectural discretion are primary concerns. Utilizing Martin Audio's Coaxial Differential Dispersion (CDD) technology in an 8" two-way passive format, the CDD8TBX delivers consistent wide-coverage sound reproduction suitable for foreground music, background audio, and speech reinforcement across distributed audio zones. The integrated constant-voltage transformer enables direct daisy-chain connection to 70V or 100V amplifier circuits, making the CDD8TBX a practical choice for AV integrators designing multi-zone 100V line speaker systems in hotels, houses of worship, retail environments, and institutional facilities. When paired with larger CDD Series models, the CDD8TBX also functions as an infill loudspeaker to address coverage gaps in complex room geometries.

Product Description

The CDD8TBX integrates Martin Audio's Coaxial Differential Dispersion driver architecture into an ultra-compact 14-litre composite enclosure, significantly smaller than the CDD10 series, while retaining the core acoustic advantages of CDD technology. The 8" LF driver and 1" exit HF compression driver share a coaxial geometry and a common ferrite motor system, producing a point-source dispersion pattern that maintains tonal consistency across the 110 to 80 degree horizontal, 60 degree vertical coverage zone.

The user-rotatable coaxial drive unit allows field adjustment of the dispersion axis to match either portrait or landscape cabinet orientation, giving the integrator flexibility to mount the speaker in constrained ceiling or wall positions without compromising high-frequency coverage uniformity. This is particularly valuable in narrow corridors, under-balcony zones, and tight architectural installations where cabinet orientation is dictated by structure.

The onboard 70V/100V line transformer provides selectable taps at 120W, 60W, 30W, and 15W via a five-way Phoenix connector, enabling precise power allocation per speaker on a constant-voltage circuit. The 8-ohm nominal impedance is retained for dual-mode operation, making the CDD8TBX compatible with both constant-voltage distributed audio amplifiers and conventional low-impedance outputs on the same installation project.

The CDD8TBX serves effectively as an infill speaker alongside larger CDD Series cabinets, filling coverage gaps in complex spaces such as under-balcony areas, alcoves, and side chambers in houses of worship or convention centers. Browse complete Martin Audio system solutions at the Martin Audio collection on Creation Networks.

Key Features

• Ultra-Compact Form Factor - 14-litre composite enclosure fits tight architectural spaces without sacrificing CDD acoustic performance.
• Coaxial Differential Dispersion (CDD) Technology - Shared ferrite motor and coaxial driver geometry delivers point-source dispersion and consistent tonal balance.
• Integrated 70V/100V Line Transformer - Onboard constant-voltage transformer enables direct daisy-chain wiring to 70V or 100V amplifier circuits.
• Selectable Transformer Taps (120W / 60W / 30W / 15W) - Five-way Phoenix connector provides precise per-speaker power allocation for accurate constant-voltage load calculations.
• User-Rotatable Coaxial Drive Unit - Field-adjustable dispersion orientation supports wall, ceiling, and angled mounting configurations.
• Infill Speaker Compatibility - Designed to integrate with larger CDD Series models as an infill loudspeaker for complex installations.
• 94dB Sensitivity / 117dB Continuous SPL - Efficient output suitable for commercial background and foreground zone audio.
• Dual 8-Ohm / Constant-Voltage Operation - Compatible with both 70V/100V distributed amplifiers and conventional low-impedance amplifier outputs.
• UPM Formi Composite Enclosure - Dimensionally stable composite construction for reliable long-term performance in permanent commercial environments.
• 6 x M6 Wall/Ceiling Bracket Inserts - Standard M6 mounting points compatible with a wide range of commercial wall and ceiling bracket hardware.

Typical Applications

• House of worship zone fill and infill coverage
• Hotel corridor, lobby, and multi-zone background audio
• Convention center and exhibition hall distributed audio
• Retail outlet background music zones
• Museum and cultural AV space foreground audio
• Multi-purpose room and training room zone reinforcement
• Commercial meeting space and conference room audio
• Under-balcony and architectural infill coverage in auditoriums

Technical Specifications

Frequently Asked Questions

How does the 70V/100V transformer tapping work on the CDD8TBX?

The CDD8TBX's internal transformer provides selectable taps at 120W, 60W, 30W, and 15W accessed via a five-way Phoenix connector. Choose the tap matching your desired per-speaker power draw, then sum all tapped loads across the daisy-chain circuit. The total must not exceed the 70V or 100V amplifier's rated output.

Can the CDD8TBX be used as an infill speaker with larger CDD models?

Yes. Martin Audio specifically designed the CDD8TBX for use as an infill loudspeaker alongside larger CDD Series cabinets such as the CDD10BTX or CDD10WTX. Its compact size and wide dispersion make it well suited for under-balcony fills, alcove coverage, and side-chamber reinforcement in complex room geometries.

Can the CDD8TBX operate on a standard 8-ohm amplifier?

Yes. The CDD8TBX retains its 8-ohm nominal impedance and can be driven directly from a conventional low-impedance amplifier without engaging the transformer circuit. This dual-mode capability allows the speaker to be used in both constant-voltage and traditional low-impedance zone configurations.

What amplifiers are compatible with the CDD8TBX?

Any commercial-grade 70V or 100V constant-voltage amplifier is compatible provided the total tapped circuit load does not exceed the amplifier's rated output. For 8-ohm direct-drive operation, any professional amplifier rated to the speaker's 200W AES power handling is appropriate.

How does CDD technology benefit compact speaker installations?

The coaxial placement of the HF compression driver within the LF cone creates a single point-source acoustic center. This eliminates vertical lobing associated with separated two-way designs and produces consistent frequency response and tonal balance across the entire coverage zone, reducing the number of speaker positions needed to achieve uniform coverage.

What mounting options are available for the CDD8TBX?

The enclosure includes six M6 inserts compatible with Martin Audio wall and ceiling bracket accessories and a wide range of third-party commercial mounting hardware. Contact Creation Networks for bracket compatibility guidance.

Is the CDD8TBX suitable for outdoor installation?

No. The CDD8TBX is rated for permanent indoor commercial installation only. For outdoor distributed audio requirements, consult the Martin Audio range at Creation Networks.

What warranty applies to the CDD8TBX?

Martin Audio products carry a manufacturer warranty covering defects in materials and workmanship. Contact Creation Networks for warranty registration and authorized service information.