Category
500 Series
Modular Synth
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Trident 80B EQ 500
Trident has brought the great sound of the 80B EQ, a sound featured in so many classic 70s rock recordings, to a 500 Series module – the
Trident 80B EQ 500.
Operating the EQ:
Begin with all boost/cut controls – those with center detents, set to their midway (‘0’) positions. Adjust the low and high mid-frequency sweep controls to their minimum positions (fully anticlockwise). The50Hz high pass ‘Filter’ switch should be in the out position. Set the frequency select switches controlling the high and low shelving sections, to 120Hz and 12kHz respectively. Lastly, set the ‘EQ’ switch to the ‘in’ position (the associated LED will illuminate).
Rotation of the high-frequency shelving control in a clockwise direction emphasizes high frequencies while turning the control in an anti-clockwise direction from center 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 8kHz. Likewise, rotating the low-frequency shelving control in a clockwise direction will emphasize low frequencies, while turning the control in an anti-clockwise direction from center attenuates low frequencies. Adjusting the ‘frequency select’ switch in the low section introduces a subtle change of emphasis to the affected low frequencies by altering the shelving point from 120Hz down to 60Hz.
The ‘low-mid’ and ‘high mid’ equalizer sections are peaking filters. Adjustment 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 center detent position: clockwise for boost, anti-clockwise to cut. The frequency to be boosted or cut is selected by the frequency sweep control knob. The range of frequencies of the ‘low-mid’ control extends from 100Hz up to 1.5kHz.
For the ‘high mid’ sweep, the frequency range begins at 1kHz (overlapping with the low-mid section) and continues up to 15kHz.
The Series 80B 500 Series EQ incorporates a classic four band equalizer 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 midrange bands and a switchable 50Hz, 12dB per octave filter. Both swept midranges have been carefully chosen for maximum effect on music programs 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 program content and it is not our intention to advise on this. Application of equalization is a very subjective matter and is best learned by experiment. The equalizer bypass switch ‘EQ’ is a useful facility for comparing the signal before and after the application of equalization.
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