User manual TANNOY PROFILE 632

[. . . ] This Alcomax 3 magnet system endows the Dual ConcentricTM with an exceptional transient response and increased sensitivity. The massive cabinet design conceals a complex horn loading system that gives greatly increased efficiency and a wavefront area approaching the wavefront area from real instruments. The Westminster Royal SE is effortlessly capable of the realistic reproduction of truly low frequencies and the widest dynamic range. Acrolink 99. 9999% (6N) high purity copper wiring is used throughout, together with specially selected crossover components, including Hovland capacitors. [. . . ] A good solution to the problem is to 'bi-wire' the loudspeakers to the amplifier. This means providing two separate sets of cables from the power amplifier to each loudspeaker and dividing the electrical signals into high current, 'slow' signals and light current, 'fast' signals. Of course, the loudspeaker must be fitted with two pairs of terminals to take the two sets of cables; your Tannoy loudspeakers are of course equipped for just this type of connection. Bi-Wiring Bi-wiring releases the full potential of the Tannoy Prestige loudspeakers. Label two of the cables Left LF and Left HF (low frequency and high frequency). Label two of the cables Left LF and Left HF (low frequency and high frequency). Undo the loudspeaker terminals, remove and retain the Bi-wiring links so that the same polarity terminals are no longer joined. If your amplifier does not have separate output terminals for bass and treble then, at the amplifier end of the cable, connect the Left LF+ and HF+ cables together. Then wire to the amplifier Left channel positive terminal marked + (plus) or coloured red. Connect the Left LF- and HF- cables together to the amplifier negative terminal marked - (minus) or black. At the loudspeaker end connect the cables marked Left LF+ and LF- to the appropriate left speaker LF terminals. Connect the Left HF+ and HF- to the appropriate + and - left speaker HF terminals. Therefore the total sound appears to emanate from a single point source located slightly behind the drive unit. This means that a full and accurate stereo image can be recreated by the loudspeakers when fed from a high quality stereo source. The Low Frequency Section The low frequency section of the Dual ConcentricTM driver is a high compliance unit of exceptional power handling and dynamic range. The completed cone is fitted with unique rigid reinforcing members to attain a very high stiffness to mass ratio thereby preserving piston action over the operating frequency range. The twin roll fabric surround is also damped and shaped correctly to terminate the moving cone and provide optimum compliance and linearity at large excursions. The cone piston is driven by a high power motor system consisting of a four-layer coil suspended in a precision magnetic air gap. The coil is wound with a special high temperature adhesive system and individually cured to ensure reliable operation at high peak power inputs. The shape of the low frequency cone is arranged to provide optimum dispersion of audio frequencies at both the high and low ends of the spectrum. The cone flare continues the high frequency horn profile to ensure a smooth transition at the crossover point. The High Frequency Section The high frequency driver consists of a wide dynamic range compression unit giving superb transient performance with a smooth uncoloured response. The compression unit feeds acoustic power through a multiple phase compensating device to the throat of a solid steel acoustic horn. This horn provides an acoustic impedance transformation to match the compression unit radiation into the listening environment. A magnesium alloy diaphragm formed by a specially developed five-stage process produces a piston with a very high stiffness to mass ratio. [. . . ] The volume of the air between the driver and the throat of the rear horn behaves as an acoustical compliance (capacitance) shown in the network as Rms in parallel with Zr. FIG. 5 Perspective view of Westminster Royal SE cabinet with front horn section removed to show the internal construction of the horn development comprising the rear folded horn. The arrows show the direction of radiation from the drive unit to the listening environment. LF cone mass M MS FIG. 6 Acoustic engineering model of compound horn system Front horn air load Z f HF horn Rear horn throat Rear horn air load Z Rear chamber compliance RMS Front horn Dual ConcentricTM Drive Unit LF cone suspension compliance C MS Rear horn FIG. [. . . ]