Views:

To understand what DC BM stands for we first need to split it into two section, DC and BM.

DC refers to the Dual Concentric driver. First developed in 1948, the technology has been subject to constant evolution and refinement over successive decades, taking advantage of new materials, manufacturing methods and acoustic research. The latest iteration of this technology is found in Tannoy’s leading products across a wide range of commercial install and sound reinforcement applications, including premium in-ceiling, in-wall and surface mount systems. Unlike ordinary drive units, the Dual Concentric is effectively two drivers properly merged into one. The high-frequency unit is positioned on the back of the low frequency driver so that they are effectively on the same axis.

With this system the sound energy is propagated from the same point and delivered through the centre of the low
frequency cone – a true point-source. The Dual Concentric delivers a spherical wave front that ensures even dispersion in the horizontal and vertical planes, providing exceptional off-axis performance.

Discrete loudspeakers have an inherent design flaw in that each drive unit is an acoustic source of its own. While the components are physically aligned on the vertical axis they cannot remain so except for at one listening point. Even those discrete systems with rotating horns suffer from a significant ‘suck-out’ in the crossover region and no amount of DSP processing can correct this phenomenon. The constant directivity characteristic of the Dual Concentric overcomes such time alignment problems.

BM or Blind Mount will refer to the style of back can that will be included with the speaker for installation.