Klark Teknik Square One Graphic, Руководство оператора

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Square ONE Graphic application notes
Square ONE Graphic 31
Square ONE Graphic application notes
Front-of-house
The graphic EQ filters of the Square ONE Graphic have been carefully selected to allow tonal correction with a
minimum of ripple between adjacent bands. While, at the same time the proportional-Q nature of the filters
ensures that in the event of acoustic feedback a tightly-focussed cut response is instantly available just by
moving the fader.
The ±12dB, 45 mm long-throw faders provide superb control resolution and excellent visibility of control
settings. The high and low-pass filters allow the frequency extremes to be matched to the capabilities of the
loudspeaker system in use, leaving all the graphic EQ faders available for acoustic management of the music.
Positive in/out switching for all the filter sections is combined with LEDs to give instant ‘at a glance’ status
indication.
Monitors
The design of the graphic filters with carefully selected Proportional-Q responses ensures that problem
frequencies can be attenuated quickly and effectively. Long-throw faders allow excellent control resolution
even when using all of the available 12dB of attenuation. Interaction with adjacent bands is minimised,
ensuring that more of the musical content is preserved. The filter pushbutton switches allow the filters to be
switched easily in and out, for example, when an artist is using different instruments during a show. LEDs
above the filter pushbuttons ensure that the filter status is always visible at a glance. High and low pass
filters allow the frequency limits to be accurately controlled for each output. This last feature, while very
useful for conventional wedge monitors, really comes into its own when combining in-ear and wedge
monitors, allowing the response of each monitor subsystem to be tailored to the artist’s requirements.
High pass filter (HPF)
High pass filters (HPFs) on graphic equalisers are used to remove unwanted subsonic frequencies
(traditionally about 30Hz). The HPF on the Square ONE Graphic is set at 80Hz. If using your Square ONE
Graphic with a large speaker system, you will almost certainly be using an active crossover, which should
provide appropriate subsonic protection. In this case, leave the HPF out of circuit.
When using more compact loudspeakers, use the 80Hz knee of the Square ONE Graphic’s HPF for maximising
their headroom and efficiency. If using your Square ONE Graphic with monitor (foldback) loudspeakers that
have an extended bass response, the HPF can still be used; in fact, useful results can be obtained by
“bending” the knee of the HPF by boosting the 63Hz fader on the Square ONE Graphic.
Low pass filter (LPF)
The Square ONE Graphic’s low pass filter (LPF) is fixed at 12kHz. This is optimal for stage monitoring
applications - both loudspeaker and in-ear monitor (IEM) systems - and will increase available headroom as
well as providing high frequency (HF) drivers with some thermal protection against ultrasonic frequencies.
When engaged simultaneously, the Square ONE Graphic’s HPF and LPF give optimal control of the operating
bandwidth of most foldback (floor wedge and IEM) transducer systems.
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