TANNOY
609.2 Dual-Concentric
Point-Source Loudspeakers
The range was to replace Series 90, but with the incredible pace of development on Dual Concentric drivers most of the range used either the 8" or the 6.5" Duals, the two top models having both driven bass units and Mass Tuned Passive Cones to produce very low frequencies. Much research had gone into this method of getting a much lower fundamental tuning of the cabinet and new techniques and materials were becoming available.
Of particular note in the Sixes Dual Concentric drivers was the use of injection-molded cones. Most manufacturers were content with vacuum forming cones because of the economy of the tooling. Tannoy realized that the vacuum forming process could not obtain the optimum profiles required to make the next quantum leap for the Dual. Very expensive injection molding tooling was developed and both the 8" and 6.5" cones used this new technique.
Yet another first for Tannoy was seen in the surrounds of the SIXES bass units and Duals. A very special and secret technique for making the roll surround an integral part of the cone profile resulted in both excellent acoustic matching of energy in the cone and surround and gave a much smoother transition for the HF wave front as it propagated down the profile.
The HF unit at the heart of the Dual Concentric drive unit is broadly similar in diaphragm and coil design to a direct radiating unit. However the energy from the diaphragm is matched to the air load by creating a spherically expanding wave front. This ensures that the directivity is even more constant and symmetrical and the whole system produces an incredible stereo image.
The perfectly spherical wave front is generated by the Waveguide at the throat of the LF unit so that the energy then propagates down the carefully arranged flare of the injection molded LF cone, which itself is optimized to ensure a smooth and extended response well integrated with the bass/midrange energy from the LF unit.
609 with 2033 8" Dual Concentric.
611 with 2033 8" Dual Concentric, 2035 8" bass.
613 w/1662 6.5" DC, 1663 6.5" bass, 1664 6.5" MTPC.
615 w/2033 8" Dual Concentric, 2034 8" bass, 2037 8" MTPC.
TANNOY Dual-Concentric AllegroSound
− Established 1973 −
"love what you listen with"
Los Angeles, California USA
Rick@AllegroSound.com
FOR SALE - TRADE 
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