Tannoy VLS SERIES Quick Start Manual - page 5
Switch For Low-Z and
transformer tap selection
A multi-position rotary switch on the rear input
panel selects either the 8 ohm low-impedance
operating mode or the high-impedance modes
(70 V or 100 V) with available transformer
taps. When using VLS Series loudspeakers in
distributed line systems, the transformer can
be tapped with available power levels shown
in the table below:
All transformer primaries should be
connected in parallel to the output of the
amplifier. The summed total power rating
in watts of the selected tap settings for
all connected loudspeakers must not
exceed the total output power rating of
the connected amplifier output channel in
watts. It is recommended that a generous
power safety margin (minimum 3 dB
headroom) be maintained between the
total loudspeaker power requirements
and the amplifier output capacity to
avoid continuous amplifier operation at
full rated output.
70 V
100 V
5 W
9.5 W
9.5 W
19 W
19 W
37.5 W
37.5 W
75 W
75 W
150 W
150 W
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Asymmetric vertical pattern:
mounting and flying
VLS Series loudspeakers are designed with
an asymmetrical vertical dispersion pattern,
a feature which allows improved performance
with simplified mounting in many applications.
The vertical dispersion of the VLS 7 and
VLS 15 is +6/-22 degrees from center axis,
while the pattern of the VLS 30 is +3/-11
degrees from center axis.
Please be aware of this feature when planning
your installation. In many situations where
conventional column loudspeakers would
require substantial downward tilt, a VLS Series
loudspeaker would require less tilt or even
allow flush mounting, thus providing a simpler
installation with improved visual aesthetics.
Mounting and flying
hardware
Wall Bracket - Each VLS Series
loudspeaker is supplied with a
standard wall bracket suitable
for mounting on most wall surfaces
at either zero tilt or at an angle
of 4 degrees. The bracket is
supplied as two interlocking
U plates. One plate attaches
to the rear of the loudspeaker
with four supplied screws as
shown. The other part is
secured to the wall. The bar on
the bottom of the speaker plate
slides into the bottom notch of
the wall plate, while the top is
secured with the two supplied
screws. Aligning the top two screw
holes results in a flat flush mount;
using the lower two screw positions
provides a 4 degree downward tilt.