OUR PART # ABBEY-ROAD-BRILL-PAC
The original equalizers were exclusively built in-house by the Abbey Road engineers in the 1960s and quickly became a secret weapon at the studios. Before the plug-in version was released, they had never been available outside of Abbey Road Studios. Softube has faithfully modelled the passive circuitry of the three original units, component by component.
RS127 Rack (grey faceplate)
The grey RS127 Rack is the original Abbey Road Studios treble equalizer. It offers a boost or cut of up to 10 dB at 2.1, 3.5 and 10 kHz.
RS127 Box (green faceplate)
When more units were needed in the studio, the portable green RS127 Box was built. The same circuit was used as in the original RS127, but with the addition of an audio transformer. The engineers quickly discovered that the transformer dramatically altered the sound character and the operating frequencies of the RS127. The frequencies got shifted a bit higher, which is of course also holds true for the plug-in model.
The RS135 was created to fill in the frequency gap that the RS127 units left out. It's fixed at 8 kHz, offers boost only and offers the same smooth and silky sound as its siblings.