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user manual
QLight
series
TQ-440SP manual
page 11
Equalisation
Because the TQ-440SP features a smooth and even frequency response, it does not need
equalisation or correction to overcome the deficiencies often found in lesser designs.
Should extended frequency response be required at more than medium sound pressure levels, the
use of the complementary TQ-425SP self-powered subwoofer is strongly recommended
In order to compensate for the room acoustics, the TQ-440SP requires only minimal equalisation.
As in any system, over-equalisation introduces phase shifts, distortion and a reduction in
headroom, usually causing more problems than it cures.
Under most circumstances a 1/3 or 1/2 octave graphic equaliser will generally be adequate, with
the fader settings applied smoothly and as little as possible for the required room compensation.
Most rooms will have resonances that will be excited at particular frequencies needing some
cut
to
help tame the sound, these problems are most pronounced at the lower frequencies where
speakers generally exhibit very little directional control.
If you find that the system needs a lot of
boost
at lower frequencies you may need additional sub-
bass units as stated above. It is good practice to use as little equalisation as possible, aiming to cut
frequencies rather than adding large amounts of boost.
Dispersion
One of the design features of the TQ-440SP is its tightly controlled 60º horizontal by 40º vertical
nominal dispersion pattern at mid and high frequencies. This gives many user advantages and
eases placement decisions, being essentially a point and shoot system. A 60º horizontal polar
pattern equals an angle of 30º either side of the centre line at which the sound pressure level is
6dB down with respect to centre, (averaged over the whole frequency range of the loudspeaker).
Thus a 40º vertical dispersion gives an angle of 20º above and below the horizon.
Cooling
The TQ-440SP amplifiers are normally cooled by the action of convection from the large heatsink
mounted externally to the amplifier module at the rear of the enclosure. It is important to leave
sufficient space around and especially above the heatsink to allow the convection of heat away
from the loudspeaker. Under the majority of circumstances this cooling effect is sufficient to
maintain the amplifiers within a normal operating temperature range. In conditions of high
ambient temperature and/or in very confined spaces, the use of an external fan module is
recommended. A 24 volt socket is provided on the rear panel for that purpose.