Equalisation, Dispersion | Turbosound TQ-445, TQ-230, TQ-425, TQ-310

user manual

QLight™ series

In general, the more powerful the amplifier, the better it will sound, provided that it is not driven into sustained clipping. It should be understood that overdriving an insufficiently powered amplifier is more likely to cause loudspeaker damage – the total energy in a heavily clipped signal is far higher than in an unclipped signal – than operating a more powerful amplifier within its ratings.

One loudspeaker management system can be used to feed several amplifiers as long as all the amplifiers are the same (or have the same gain ratings). More than one loudspeaker management system may be required if the amplifiers are of different gain or type. Please contact your dealer if you require help in this area.

Equalisation

QLight™ 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 Turbosound subwoofer enclosures is strongly recommended.

In order to compensate for the room acoustics, Qlight™ 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.

Dispersion

Qlight™ series loudspeakers fall broadly into two categories of dispersion pattern: wide and medium. While a wide horizontal coverage pattern of approximately 80° to 100° is appropriate for a majority of small to medium venues, one of the design features of the TQ-445 is a tightly controlled 60º horizontal by 40º vertical dispersion pattern at mid and high frequencies. This gives many user advantages and eases placement decisions, being essentially a point and shoot system. The more focused directivity results in greater projection capabilities, making the TQ-445 very suitable for theatre and small auditorium applications. Remember that a 60º horizontal polar pattern equals an angle of 30º either side of the centre line at which the sound pressure level is

TQ series manual page 9