Martin Audio brings engineering innovation to installed sound with the all-new CDD™ Series — combining distinctive curved enclosures with unique Coaxial Differential Dispersion™ technology to deliver class-leading performance, fidelity and coverage consistency to venues that demand the ultimate in cutting-edge technology and style.

Whether it’s a bar, an AV installation, a church or a prestige nightclub — the CDD Series has it covered. CDD is the one-stop solution; six two-way full-range coaxial systems — from the micro CDD5 to the powerful CDD15, complemented by high-performance subwoofers — cover practically all install applications.

The CDD Series has the audience covered too. Coaxial Differential Dispersion technology delivers more consistent audience coverage than systems with fixed dispersion X° x Y° horns — projecting more output to the rear of the audience to distribute sound evenly front-to-back, while having wide horizontal coverage close-up. The increased coverage area can reduce the speaker count in larger installations.

Visually-appealing enclosure design is a signature of the CDD Series. The full-range enclosures can be used in either horizontal or vertical orientation, with rotation of the coaxial driver easily accomplished by removing the screw-free, protective grille. The curved shape of each full-range enclosure allows it to be discreetly mounted close to a wall or ceiling by means of a comprehensive range of mounting accessories.

With the exception of CDD5, all the enclosures are moulded in rigid UPM Formi — a composite material which combines stiffness with excellent internal damping properties. From the CDD8 upwards, speaker baffles are machined from birch ply and all models feature sophisticated internal rib structures to reduce weight and increase rigidity. Finished in black (RAL90095) or white (RAL9016) as standard, the enclosures can be supplied in any RAL colour to special order.



CDD combines the ‘point-source’ benefits of coaxial designs with the consistent coverage of Differential Dispersion technology. All CDD Series full-range models feature Martin Audio’s unique, patent-pending Coaxial Differential Dispersion™ technology to deliver perfect sound to every member of the audience.


Non-coaxial systems can suffer from uneven frequency response in the crossover region because the outputs of the LF and HF sections interfere with each other, causing variations off-axis, depending on the listening position. This is especially true close to the loudspeaker.

In contrast, coaxial systems can achieve ‘point-source’ summation of the LF and HF sections at all positions off-axis, even close-up. This is one reason that coaxial devices are often used for nearfield applications such as studio monitoring.

Significantly, until now one disadvantage of conventional coaxial devices has been high frequency beaming, where the high frequency dispersion reduces as the frequency increases. This is primarily because conventional coaxial devices channel high frequencies through a narrow tube in the pole-piece of the magnet system. CDD Series coaxial devices overcome this by incorporating an innovative static waveguide that merges seamlessly with the unique cone shape — maintaining the dispersion pattern out to very high frequencies.



A Differential Dispersion horn has a 3D trapezoid dispersion pattern which covers a room more evenly than a system with a conventional, fixed-dispersion X° x Y° type horn.

With a conventional X° x Y° horn, the speaker is usually placed above head height and aimed towards the centre of the audience. This produces an imperfect coverage pattern which misses out some areas — particularly side areas close to the loudspeaker.

In contrast, a CDD Coaxial Differential Dispersion system produces a rectangular coverage pattern to reach all corners of the audience, and wide horizontal coverage is achieved very close to the loudspeaker. Walking the room, the consistency in frequency response and SPL — both close to the loudspeaker and further back — is exceptional. The improved coverage close-up also means that CDD speakers can be spaced further apart in some instances, reducing overall speaker count.

CDD Features:

  • Versatile, passive, two-way systems
  • Coaxial ‘point-source’ performance
  • Differential Dispersion™ technology
    for consistent coverage
  • Elegant UPM Formi composite enclosures
    (except CDD5)
  • User-rotatable coaxial drive units
  • Vertical and horizontal mounting options
  • Screw-free perforated steel grilles
  • 8Ω nominal impedance
  • Discreet mounting accessories
  • Integral inserts for eyebolt suspension of CDD10, CDD12 and CDD15