Equalisation; Mounting And Flying; Asymmetrical Pattern Considerations - Tannoy VLS 7 Operation Manual

7. Equalisation

VLS Series loudspeakers require no equalisation or correction to overcome system limitations; equalisation
is necessary only to compensate for difficult acoustic environments. Over-equalisation can reduce system
headroom and introduce phase distortion, resulting in degraded sound. If equalisation is required, it should
be applied gently and smoothly. Because VLS Series loudspeakers are phase coherent designs, excessive
equalization usually proves detrimental to the overall sound quality. When one loudspeaker is used in close
proximity to another, comb filtering effects can create coverage problems. (Comb filtering creates an uneven
frequency response across the coverage area due to constructive and destructive interference effects
between the two sources.) Comb filtering cannot be cured by equalisation; this should be addressed
with proper loudspeaker placement.

8. Mounting and flying

8.1 Asymmetrical pattern considerations

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 acoustic center axis, while the pattern of the VLS 30 is +3 / -11 degrees from
acoustic 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.
VLS 7
+6°
-22°
536 [21,11]
VLS 15
+6°
-22°
536 [21,11]
VLS 30
+3°
-11°
671 [26,41]
VLS Series Operation Manual rev 1.1.0
7. Equalisation
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