user manual
QLight series
Equalisation
QLight 300 series enclosures are designed to provide smooth and even frequency response. They
do not need excessive amounts of external equalisation to overcome the sonic deficiencies often
found in many lesser designs.
Should an extended frequency response be required at more than moderate sound pressure
levels, the use of complementary TQ-115 or TQ-425 subwoofer enclosures is strongly
recommended.
In order to compensate for the room acoustics, QLight 300 series enclosures require 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 loudspeakers 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. It is good practice to use as little equalisation
as possible, aiming to cut frequencies rather than adding large amounts of boost.
Converging Elliptical Waveguide
A design feature of the TQ-310 and TQ-315 is the Converging Elliptical Waveguide (CEW),
available in two directivity patterns: 100° x 60° for the TQ-310 and 80° x 50° for the TQ-315. This
gives many user advantages. The comparatively short flare length allows the HF and LF
components to be physically aligned in the cabinet, so ensuring coherent arrival at the listener’s
ear irrespective of distance from the loudspeaker. The elliptical format shapes the wavefront
smoothly, and eliminates reflections in the throat area. Additionally this design does not suffer
from the distortion typical of horns employing diffraction edges.
The waveguides can be removed and rotated through 90º in the cabinet, which allows the
products to be installed in either vertical or horizontal formats while retaining the required
coverage.
TQ-300 series manual
page 9
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