The Trident 80B-EQ 500 Series 4-Band EQ Module is a world-class EQ module, the 500 series version of the Trident 80 Rack Unit EQ, featuring switchable high and low shelf, switchable low-cut and 2 half parameter mid-bands. Used in top studios around this world, this module delivers exceptional audio quality for your recordings.

Begin with all boost/cut controls - those with centre detents, set to their mid way ('0') positions. Adjust the low and high mid frequency sweep controls to their minimum positions (fully anticlockwise). The 50Hz 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).

The Series 80B 500 Series EQ incorporates a classic four band equaliser 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. Application of equalisation is a very subjective matter and is best learned by experiment. The equaliser bypass switch 'EQ' is a useful facility for comparing the signal before and after the application of equalization.

The main features of the Trident 80B-EQ 500 Series 4-Band EQ Module include:

• 500 Series 4-Band EQ Module
• Identical to the Trident Series 80 Rack Unit
• Switchable High and Low-Shelf
• 2 Half Parameter Mid-Bands
• Switchable Low-Cut