Manual

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] Overview

OverviewOverview

Overview

The REQ-2.2 is a stereo audio equalizer with four “eq” bands per channel

plus a high pass filter and unique “saturation” module. Front panel controls

allow you to adjust each eq band centre frequency, filter bandwidth (or Q)

and the amount of cut/boost. Each element has it’s own on/off switch

which removes it from the signal path when off.

The high and low bands can be switched from a bell filter to a shelving

filter, and the bandwidth control reverts to a shelf slope control when in

shelf mode. The mid bands can be switched between two frequency

ranges as indicated on the front panel.

There are two versions of the REQ, the standard version and a mastering

version. The differences between the two versions are the high pass filter

turn over frequencies (see graphs at the end of this manual), and the

cut/boost controls. The mastering version utilizes a 23 position stepped

attenuator (+/-8dB range) for the cut/boost control, whilst the standard

version offers a continuously variable +/-16dB range with centre detent.

The REQ uses real chokes and capacitors in a parallel resonant circuit

configuration to generate the eq shapes, and this is why it is called the

Resonance Equaliser. Whilst difficult to implement with adjustable

bandwidth, the sound of these passive resonate circuits is far superior to

that of electronically simulated filters.

Unique to the REQ-2.2 is the saturation module which when engaged, adds

subtle amounts of harmonic distortion to the signal and also alters the low

frequency response (see graphs for detail). The saturation module utilizes a

steel core transformer driven by a “single ended” amplifier to achieve this

effect, and is useful in creating a more “vintage” sound. The effect of the

saturation is dynamic in that the higher the signal level, the greater the

effect will be.