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user manual
QLight™ DP series
QLight DP series manual
page 19
Mode A / Mode B switch
This rear panel switch modifies the overall response of the system in order to give you optimised
profiles for differing applications.
When the Mode A position is selected, the low frequency section is extended down to a nominal
cut-off frequency of 35Hz, which makes the loudspeakers balanced for full range reproduction of a
wide range of music. The low frequency extension is achieved by using low shelf @ 90Hz.
When the Mode B position is selected, the response of the system will exhibit a reduced low
frequency. This roll-off setting is specially designed for use with Turbosound QLight™ DP
subwoofers. This restricted LF response is also useful in speech applications where reduced LF
levels can lead to better vocal intelligibility.
Updating firmware or loudspeaker parameters
Periodically Turbosound will release updated settings to improve the performance of your
loudspeaker system. Your local Turbosound dealer will be able to give you the latest settings.
These are released with comprehensive instructions on how to upgrade your units.
NOTE: When updating firmware both Limit LED’s will light continuously while the download is
taking place. Both LED’s will operate normally during a settings upload.
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 QLight™ 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.