Crossovers; Equalisation/Positioning - Tannoy VS15 HL User Manual

5.

Crossovers

The VS15HL has been designed to be used in conjunction with Tannoy controllers for
optimum performance, these provides specific crossover and equalisation functions for
the V series combinations as well as combinations of other Tannoy products. Of course
the VS15HL is compatible with other OEM controllers/crossovers. For optimum
performance please refer to the section on System Configurations & OEM Controllers.
6.

Equalisation/Positioning

The VS15HL is designed to need no equalisation or correction to overcome system
limitations. As a result, it will only need equalisation to compensate for difficult acoustic
environments.
Excess equalisation can reduce system headroom, and introduce phase distortion
resulting in greater problems than it cures. If equalisation is required then it should be
applied gently and smoothly. Violent equalisation will be detrimental to the overall
sound quality.
The frequency band over which a subwoofer operates is essentially omni-directional,
therefore efficiency of the VS15HL may be further enhanced if the unit is placed against
a wall, where the radiation in the forward plane will be doubled due to the addition of
the reflected rear directed energy, and a 3dB increase in sound pressure will occur. If
another boundary is introduced, say a floor, then the effective radiation space is halved
again, resulting in a further 3dB lift, and if placed in a corner, once again the sound
pressure level will increase by a further 3dB.