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user manual
QLight™ series
TQ series manual
page 8
SYSTEM REQUIREMENTS
QLight™ series passive loudspeaker enclosures require only one amplifier channel for correct
operation, the frequency splitting between the low frequency driver and the high frequency driver
being accomplished by the internal passive crossover network built into each enclosure. If
subwoofer enclosures are used as part of a bi-amplified system in conjunction with QLight™
series 2-way enclosures to extend low frequency response, additional amplifier channels and
external electronic crossovers will be required. The Turbosound LMS-D6 and LMS-4 digital
loudspeaker management systems are recommended for this purpose, as well as other
professional quality digital controllers.
Bi-amplified loudspeaker enclosures require the use of one amplifier channel per frequency band
for correct operation. Frequency splitting between the low frequency driver, and the mid and high
frequency section drivers is accomplished by an external electronic crossover; while frequency
splitting between the mid frequency driver and the high frequency driver in 3-way models (TQ-
445) is handled by an internal passive crossover.
Dedicated subwoofer enclosures require an additional amplifier channel when used as part of an
extended frequency system. Frequency splitting between it and a QLight™ series mid-high
enclosure is accomplished by an external crossover. Turbosound digital loudspeaker management
systems are recommended for this purpose.
Amplifier considerations
Turbosound speaker enclosures should be driven by high quality power amplifiers designed for
true professional use. Such amplifiers will have balanced inputs, DC and RF fault protection, and
well designed cooling systems for reliability. Turbosound power amplifiers such as the T-45 and T-
25 are recommended for this purpose.
The program power listed in the loudspeaker’s technical specification is the best guide to the size
of amplifier required for general purpose applications. The amplifier should therefore be capable
of delivering long term broadband power equal to the loudspeaker’s program power rating at the
loudspeaker’s stated nominal impedance. This approach allows sufficient headroom to generate
good dynamic range.
RECOMMENDED AMPLIFIER POWER RATINGS:
The amplifier's rated r.m.s. continuous power output (20Hz – 20kHz, per
channel) should be equal to the program power handling of the
loudspeaker at its nominal impedance.