Tannoy GRF
Enclosures designed for 15" Tannoy Dual Concentric Drive Units

Description
As a fitting complement to the Tannoy 'fifteen' dual concentric unit, our research laboratories now give you the expanding source loudspeakers system.
This unique enclosure embodies all of the well known advantages of horn loading, eg excellent bass radiation and transient response, but suffers from none of the spatial distribution defects associated with conventional horns.
The overall efficiency of the system is also high with the result that not more than 3 watts peak are required for even the largest living room.
The effective source size of the system varies with frequency, below 200 cps for the LF diaphragm of the dual concentric is horn loaded both front and rear; from 200 cps - 1000 cps the front loading only is effective, thus giving a reduction in apparent source size.
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