Tannoy PRESTIGE YORKMINSTER SE Owner's Manual - page 4
6
Bi-Amping
(See fig. 4)
Bi-Amping extends the principle of bi-wiring one stage further. In this connection option separate power amplifiers are
used for bass and treble signals in each loudspeaker. Four mono (or two stereo) amplifiers of the same type are required
for a stereo pair of loudspeakers. Ensure that the cable links between the loudspeaker terminals are removed and that
correct polarity is maintained throughout.
If two stereo amplifiers are used, it is recommended that one amplifier supply bass information to left and right loudspeakers
and the other, the treble information.
It is essential that the coupling link cables between the loudspeaker terminals be removed. Avoid potential damage to your
amplifier — ensure that all connections are secure and the polarity is correct in all wiring.
Connection Of Earth Or 'Ground' Lead
(See figs. 2, 3 and 4)
To optimise performance further, use a shielded or screened loudspeaker cable. The screening termination should be
connected to the earth or ground (green) terminal on the loudspeaker and to the ground or earth connection on the
amplifier. Alternatively if you are not using a screened loudspeaker cable but wish to utilise the earthing facility, run a
single cable between the earth.
It is essential that the coupling link cables between the loudspeaker terminals be removed.
Avoid potential damage to your amplifier - ensure that all connections are secure and the polarity is correct in all wiring.
Grille Removal
Special acoustically transparent cloth is used in the grilles. However, for ultimate fidelity the enthusiast will find it is best
to use these loudspeakers with their grilles removed during listening.
The front grille is removable for access to the front panel controls. Unscrew the grille removal knob from the rear of the
cabinet, and screw into the hole in the bottom of the grille. Using this knob, pull the bottom of the grille away from the
cabinet; the grille will drop down from its upper location. Take care not to damage the wooden lower part of the cabinet.
To replace the grille engage the top of the grille into the slot in the cabinet and push the grill into the recess. Apply slight
pressure to the bottom, until the grille clicks in place.
Loudspeaker System Adjustment
(See fig. 5)
Each loudspeaker is fitted with two controls located on the front baffle beneath the detachable grille. These high current
switch blocks are labelled ROLL OFF and ENERGY. They can be used to compensate for the varied acoustic characteristics
of listening rooms. The controls should be adjusted with the amplifier tone controls in the ’flat’ or uncompensated position.
Each loudspeaker should be adjusted individually. Fully rotating the amplifier balance control, to select first one loudspeaker
and then the other, is the easiest way to do this.
The Energy control has five positions. It allows the output of the high frequency compression drive unit to be increased
or decreased from the linear or ’flat’ position over a frequency band from approximately 1 kHz to 20kHz.
7
Running in
Like all loudspeakers, the drive unit in your Tannoy Yorkminster requires a while to reach optimum performance, as the
stresses in the materials relax - especially in the suspension system. For this reason, it is beneficial to run the system at
fairly high levels at normal room temperature, for approximately 20 hours to achieve best results.
The Roll off control has five positions (+2, level, -2, -4 and -6dB per octave) and provides adjustment at extreme high
frequencies from 5 kHz to 20kHz.
The energy control has a shelving effect over the 1kHz to 20kHz frequency band whereas the roll off control increases
or decreases the slope of the extreme high frequency response hinging about 5 kHz.
The flattest, most linear response from the loudspeaker will be obtained with both controls set at the LEVEL position,
and this position should be used for initial listening tests. If the overall quality of the high frequency sound seems too
prominent the -1.5 or -3 positions for the Energy control should be tried. If the sound appears subdued in the treble region
+1.5 or +3 settings may be preferred. Once the energy control setting has been established the Roll off control can be
adjusted to reduce or slightly increase the extreme high frequency content if necessary.
Remember the changes that can be made by moving either control from one position to another are subtle. They may
not easily be heard if the programme material has very little content in the frequency band under consideration. Choose
a well-balanced piece of music with a full spectrum of sound. The correct setting will be found when the loudspeakers
are no longer evident and only the musical performance is heard.
Tannoy Dual Concentric Drive Unit
One of the unique advantages of the Tannoy Dual Concentric“ principle is that the low and high frequency sound
radiation is generated on the same axis. The high frequency unit is mounted behind, and concentrically with, the low
frequency unit. High frequency sound radiates from the centre of the low frequency unit through a carefully designed
high frequency exponential horn. Low and high frequencies are therefore fully integrated at source. It is this feature that
gives the Dual Concentric“ driver such unique sound reproduction qualities.
There are other significant benefits. The high frequency unit does not obstruct the low frequency unit in any way (a unique
feature when compared with other so called coaxial systems). Polar dispersion of sound is symmetrical in both horizontal
and vertical planes. By careful crossover network design the virtual acoustic sources of the high and low frequency units
can be made to occupy the same point on the axis. Therefore the total sound appears to emanate from a single point source
located slightly behind the drive unit. This means that the loudspeakers, when fed from a high quality stereo source, can
recreate a full and accurate stereo image.
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