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user manual
QLight
series
TQ-440SP manual
page 10
Audio Input
The signal input to the TQ-440SP is fully balanced, with an input impedance of 10kΩ. The input
XLR connector is wired pin 2 hot (+ve), pin 3 cold (-ve), and pin 1 screen (shield). The link XLR
connector is wired pin 2 hot (+ve), pin 3 cold (-ve), and pin 1 not connected. Multiple TQ-440SP
enclosures may be driven from a single audio console, up to a practical limit of 16 units. Any more
will cause unacceptable signal loss due to the loading of the console output.
Limiting Functions
The TQ-440SP is equipped with accurate peak limiters for both high frequency and low frequency
sections. Because the HF and LF limiters work independently of each other, there is no possibility
of either section compromising the performance of the other as is the case with a single broad-
band limiter. Furthermore, each limiter has its attack and release time constants independently set
and optimised according to the operating frequency range.
Music / Speech Optimisation
A rear panel switch modifies the overall response of the TQ-440SP in order to give you optimised
profiles for different applications. When the speech position is selected, the response of the
system will exhibit a reduced low frequency / low midrange content, which has the effect of
making the upper part of the frequency range more prominent. This results in exceptionally good
intelligibility, and therefore the speech setting is recommended whenever maximum voice
projection is required. Additionally, under most circumstances the speech setting will provide
higher perceived maximum sound pressure level.
When the music position is selected, the low frequency section is extended down to a nominal cut-
off frequency of 55Hz, which makes the TQ-440SP balanced for full range reproduction of a wide
range of music. The low frequency extension is achieved by using a combination of a 2
nd
order
high-pass filter and a dynamic EQ section, with the following benefits:
♦ Frequencies below 50Hz are attenuated, and the mechanical stress on the low frequency drive
unit is therefore maintained within safe limits.
♦ The use of dynamic as well as than fixed EQ reduces the loss of headroom on large signals.