HD-53Z - CDT Audio High Definition 5.25" 2-Way Coaxial Speakers

First consider the typical speaker configuration. The coaxial mounting type and the simple full range speaker also provide simple mounting convenience. However the full range cannot really do the job as asking one speaker to do full range is just too much to ask without major sacrifices. Dispersion, power handling and distortion are just the first three compromised parameters.

The coaxial two-way speaker mounts the Tweeter on an axis ahead of the apex of the main cone. This Tweeter blocks the sound from the main cone as well as producing sound that is always ahead of the main cone. The supporting post utilized in this design must pass through the dust-cap and thus allows dirt to pass into the voice coil gap or requires an extra, restrictive noisy spider to exclude some potential dirt ingress.

The area created between the back of the blocking Tweeter and the apex of the cone forms a resonant cavity that can color the sound from both woofer and Tweeter. The volume of this cavity can vary during long mid/woofer excursions. Response ripple at the crossover frequency can result. The sound from the forward mounted Tweeter is always ahead of the main cone and is never time aligned with this cone. Most coaxial speakers use a cheap single crossover part embedded somewhere in the assembly.

The CDT Audio Braxial design solves these problems. The dust-cap is retained for a clean extended high end from the mid/woofer and positively excludes dirt that may enter from the automotive interior. The Tweeter is not mounted on top of the dust-cap or the apex of the cone. Instead it is placed in the cone area but to the side where it allows the Tweeter to couple strongly to the mid/woofer and to be rotationally placed to time align the woofer dome and the Tweeter. This means there is an area defined by points, which are equidistant to the apex of the cone and the Tweeter diaphragm. Additionally the Tweeter, which itself is angled, may be directed during mounting. Finally one ideal mounting and listening position exists to provide the best of both.

Relative to individual drivers the CDT Audio Braxial design provides a more predictable result in conjunction with the high-quality external matching crossover network. The Braxial assembly uses the same high quality soft dome Tweeter and rubber edged Kevlar mid/woofer as provided in the separate system kit. However the interaction of the sound fields between the Tweeter and mid/woofer in the Braxial allows each driver to accentuate the output of the other. This expresses itself as a broader polar response in the crossover region. Also the enhanced time alignment lends precision and clarity through an improved transient response.

This component's crossover ES200Z is a large high quality module. This is the gentlemen's crossover. In this model the woofer crossover is melded with an adjustable equalization system to adapt the mid-woofer to mounting in any position for optimum performance. This function is separately available as the TX-1000. Five "tapers" and seven levels are provided. The "aux" Tweeter has two jumper-settable levels also. It is suggested that the module's amplifier be set to high pass for maximum power use. The Tweeter crossover is transient optimized at 3.7kHz. Large high quality parts are employed

• Braxial 5.25" cast 2-way
• ES-200Z Transient Optimized Zone Adapter 2-way crossover
• 3/4" / 20mm tweeter
• Power - 160W
• Frequency - 65-20kHz
• Sensitivity - 91.6 dB

HD-53Z - CDT Audio High Definition 5.25" 2-Way Coaxial Speakers