Trident 80B EQ 500 Series, Руководство пользователя

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Trident Audio Developments
| 80B EQ 500 Series User Manual
Operating The Equalizer
Rotation of the high frequency shelving control in a clockwise direction
emphasises high frequencies, while turning the control in an anti-clock-
wise direction from centre attenuates high frequencies.
Operating the ‘frequency select’ switch in the high frequency section
introduces a subtle change of emphasis to the affected high frequencies,
as the shelving ‘knee’ is changed from 12kHz to 5kHz. Likewise, rotating
the low frequency shelving control in a clockwise direction will emphasise
low frequencies, while turning the control in an anti-clockwise direction
from centre attenuates low frequencies. Adjusting the ‘frequency select’
switch in the low section introduces a subtle change of emphasis on the
affected low frequencies by altering the shelving point from 120Hz down
to 60Hz.
The ‘low mid’ and ‘high mid’ equaliser sections are peaking filters. Adjust-
ment of their parameters is achieved by use of the boost/cut knob and
its associated frequency sweep knob. Boost or cut of a given frequency is
performed by moving that control from its centre detent position: clock-
wise for boost, anti-clockwise to cut. The frequency to be boosted or cut
is selected by the frequency sweep control knob. The range of frequen-
cies of the ‘low mid’ control extends from 100Hz up to 1.5kHz.
For the
‘high mid’
sweep, the frequency range begins at 1kHz (overlap-
ping with the low mid section) and continues up to 15kHz.
The Series 80B 500 Series EQ incorporates a classic four band equalis-
er which is identical to that employed in the Trident Series 80 console.
It consists of frequency switchable high and low pass shelving sections,
coupled with two swept low and high mid range bands and a switchable
50Hz, 12dB per octave filter. Both swept midranges have been carefully
chosen for maximum effect on music programme and a good degree of
overlap is provided.
Finally, selecting the ‘Filter’ switch introduces a smooth, 50Hz, 12dB/
octave roll-off to effectively eliminate ‘rumble’ caused by, among other
things, someone’s feet moving about near a microphone stand, nearby
traffic noise and AC systems. The amount of boost (accentuation) or cut
(attenuation) that is applied to the audio signal is entirely dependent on
the programme content and it is not our intention to advise on this. Ap-
plication of equalisation is a very subjective matter and is best learned by
experiment. The equaliser bypass switch ‘EQ’ is a useful facility for com-
paring the signal before and after the application of equalization.