Martin Audio CDD8TWX – 8" 70V/100V Transformer Speaker (White)

Product Overview

The Martin Audio CDD8TWX is an ultra-compact, transformer-coupled 70V/100V distributed loudspeaker finished in white for commercial zone audio installations where architectural discretion and visual integration are essential. Sharing the identical acoustic platform as the CDD8TBX, the CDD8TWX employs Martin Audio's Coaxial Differential Dispersion (CDD) technology in an 8" two-way passive configuration, delivering 94dB sensitivity and 117dB continuous SPL suited to foreground music, background audio, and speech reinforcement across distributed audio zones. The integrated constant-voltage transformer allows direct daisy-chain connection to 70V or 100V amplifier circuits, and the compact 14-litre composite enclosure fits architectural spaces where larger cabinets cannot be accommodated. AV integrators deploying 100V line speaker systems in light-colored commercial interiors — hotels, houses of worship, boardrooms, and retail environments — will find the CDD8TWX an effective, discreet solution for multi-zone audio coverage.

Product Description

The CDD8TWX combines Martin Audio's Coaxial Differential Dispersion driver technology with an onboard 70V/100V line transformer in a white-finish enclosure purpose-built for permanent commercial installation. The 8" LF driver and 1" exit HF compression driver are arranged coaxially with a shared ferrite motor system, producing a point-source radiation pattern with 110 to 80 degree horizontal and 60 degree vertical coverage that maintains consistent tonal balance and speech intelligibility from the nearest listener position to the far end of the coverage zone.

The user-rotatable coaxial drive unit allows the dispersion axis to be field-adjusted for both portrait and landscape cabinet orientations, a critical feature in installations where structural constraints dictate mounting direction. This flexibility reduces the need for additional speaker positions to fill coverage gaps, lowering both labor and cabling costs in large multi-zone distributed audio systems.

The five-way Phoenix connector provides transformer taps at 120W, 60W, 30W, and 15W, enabling the system designer to assign precise power draw to each speaker on the constant-voltage circuit. Accurate per-speaker power allocation is fundamental to 70V and 100V distributed audio system design, ensuring the cumulative load across a daisy-chain circuit stays within the amplifier's rated output while achieving the target SPL in each zone. The retained 8-ohm nominal impedance allows the CDD8TWX to operate on conventional low-impedance amplifier outputs as well, providing topology flexibility across complex multi-zone installations.

The CDD8TWX integrates directly with larger CDD Series loudspeakers as an infill speaker for under-balcony coverage, side-chamber reinforcement, and architectural gap filling in auditoriums, convention centers, and houses of worship. The white UPM Formi composite enclosure and screw-free white perforated steel grille blend into light-colored ceilings and walls for a clean, professional finish. Six M6 inserts support a wide range of wall and ceiling bracket mounting hardware. Explore compatible Martin Audio system components at the Martin Audio collection on Creation Networks.

Key Features

• White Finish for Architectural Integration - White textured enclosure and grille suited to light-colored commercial interiors including hotel lobbies, worship spaces, and boardrooms.
• Coaxial Differential Dispersion (CDD) Technology - Point-source coaxial driver maintains time-aligned, consistent frequency response and tonal balance across the coverage zone.
• Integrated 70V/100V Line Transformer - Onboard constant-voltage transformer supports direct daisy-chain connection to 70V or 100V distributed audio amplifiers.
• Selectable Transformer Taps (120W / 60W / 30W / 15W) - Five-way Phoenix connector enables precise per-speaker power allocation for accurate constant-voltage system load calculations.
• User-Rotatable Coaxial Drive Unit - Field-adjustable dispersion axis supports portrait and landscape mounting without altering HF coverage geometry.
• Ultra-Compact 14-Litre Enclosure - Fits constrained ceiling and wall positions where larger commercial speakers cannot be installed.
• Infill Speaker Compatibility - Integrates with larger CDD Series models to address under-balcony, alcove, and side-chamber coverage gaps.
• 94dB Sensitivity / 117dB Continuous SPL - Efficient output suitable for commercial background and foreground zone audio at standard amplifier power levels.
• Dual 8-Ohm / Constant-Voltage Operation - Compatible with 70V/100V distributed amplifiers and conventional low-impedance outputs for mixed-topology systems.
• UPM Formi Composite Enclosure - Dimensionally stable composite material for reliable long-term performance in permanent commercial environments.

Typical Applications

• House of worship zone fill and infill coverage
• Hotel lobby, corridor, and multi-zone hospitality background audio
• Boardroom and conference room speech reinforcement
• 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
• Under-balcony and architectural infill coverage in auditoriums

Technical Specifications

Frequently Asked Questions

How does the 70V/100V transformer tapping work on the CDD8TWX?

The CDD8TWX's internal transformer provides selectable taps at 120W, 60W, 30W, and 15W via a five-way Phoenix connector. Select the tap matching the desired per-speaker power draw, then sum all tapped loads across the circuit. The total must not exceed the 70V or 100V amplifier's rated output. Lower tap settings extend the number of speakers supportable per amplifier channel while reducing per-speaker SPL output.

Can the CDD8TWX be mixed with the black CDD8TBX on the same circuit?

Yes. The CDD8TWX and CDD8TBX are acoustically and electrically identical — the only difference is cabinet finish. Both can be used on the same constant-voltage circuit with identical tap settings and load calculations.

Can the CDD8TWX operate on a standard 8-ohm amplifier?

Yes. The CDD8TWX retains its 8-ohm nominal impedance and can be driven from a conventional low-impedance amplifier without engaging the transformer. This dual-mode capability provides configuration flexibility for mixed-topology distributed audio systems.

What amplifiers are compatible with the CDD8TWX?

Any commercial-grade 70V or 100V constant-voltage amplifier is compatible provided the cumulative tapped 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. System protection via a compatible controller with appropriate limiter settings is recommended.

Can the CDD8TWX be used as an infill speaker alongside larger CDD cabinets?

Yes. Martin Audio designed the CDD8TWX for infill deployment alongside larger CDD Series loudspeakers such as the CDD10WTX. Its compact enclosure and wide dispersion make it well suited for under-balcony fills, alcove coverage, and side-chamber reinforcement where larger cabinets cannot be positioned.

What makes CDD technology beneficial in commercial distributed audio?

Coaxial Differential Dispersion co-locates the HF compression driver within the LF cone, creating a true point-source acoustic center. This eliminates vertical lobing and off-axis tonal shift inherent in separated two-way driver designs, producing more consistent speech intelligibility and music reproduction across the full coverage zone — particularly important in reverberant commercial and institutional spaces.

What mounting hardware is compatible with the CDD8TWX?

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

What warranty applies to the CDD8TWX?

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