This six-position controls adjusts the attack/release speed of the compressor. This routes the High Pass Filter into the side chain of the compressor circuit. One can take this audio and pass it through an external equalizer then return it back to the “SIDE CHAIN RETURN” jack, so changes on the external EQ affect the response of the compressor. The audio that normally controls the compressor is available on the “SIDE CHAIN SEND” jack. These pairs of jacks are used to perform some fine-tuning of the compressor operation. When engaged, this inserts an external device into the side-chain signal path via the rear panel side-chain insert jacks. Sets the “slope” of the compression from 1.5:1 (minimal) to 8:1 (significant). Minimal or no compression is with this control fully clockwise and it gets more sensitive and tends to cause more gain reduction as the knob is rotated counter-clockwise. Sets level where the compressor may begin to react, from -25 dB to +20 dB. The compressor-limiter section is engaged with this button in. +/- 15dB, Shelf or Peak, selectable at 8 kHz or 16 kHz. +/- 15dB with 6 center frequencies 220 Hz, 400 Hz, 900 Hz, 1.8 kHz, 3.5 kHz and 7.5 kHz, with MID HI Q switch to narrow the bandwidth or increase the Q of the filter. +/- 15dB, Shelf or Peak, selectable at 35 Hz, 60 Hz, 100 Hz or 220 Hz. This switch engages all EQ frequency bands except the HPF. Note that engaging the HPF to S/C switch moves the HPF from the primary signal path to the compressor side-chain signal path. The HPF FREQ potentiometer is variable from 20Hz to 250Hz, and can be used to filter out unwanted low frequencies, or in conjunction with the EQ to help shape source material. The HPF switch engages a 12dB per octave high pass filter. (The symbol “Ø” is often used to denote opposite polarity.) This push button switch inverts the polarity of the signal path. This push button switch engages phantom power on the microphone input. This rotary switch provides further continuous gain adjustment over a range of +/– 6 dB. This 12-way precision rotary switch controls gain from 0 to 66 dB in 6 dB steps. When red, it indicates 2-3dB below input stage clipping of the Mic/Line stage (+23 dBu while the pre actually clips at +25 dBu). When green, it indicates “Signal Presence” (a signal level of -20dBu). This switch separates the direct connection from audio signal ground to chassis earth. Switches between microphone/direct injection input (button out) or line input (button in). The DI also includes a passive THRU output to feed a separate amplifier. This design, delivers exceptional clarity to high-Z sources, with a substantial low-end presence and incredibly smooth high frequencies. The Hi-Z front panel input uses the same discrete class-A FET with transformer topology as the Rupert Neve Designs RNDI, but it utilizes the new RN4012 input transformer directly into the microphone preamp for gain. By manipulating the Texture control, the amount of Silk can be changed from essentially absent, to roughly 4-5% THD (mostly second order) depending on how hard the output transformer is being driven. Red Silk accentuates the musical harmonic saturation from the mid and high frequencies, while Blue Silk accentuates harmonics from the low and low-mid frequencies. Silk reduces the negative feedback on the output transformer, adding harmonic content as the texture is increased. Pushing the Silk button cycles the Silk modes from Red to Blue to OFF.
HIGH HEADROOM HIGH IMPEDANCE PREAMP FULL
What is diode bridge compression? Where the VCA compressor found in the Master Buss Processor provides unmatched clarity, the weighty, harmonically rich tonality of diode bridge compression can be essential in pushing key sources like vocals, electric guitars, bass and drums to the forefront of a mix.īy understanding the limitations of vintage units like the legendary 2254, painstaking effort was taken to reproduce the unique tone of these classics while improving the noise floor & accuracy, expanding inflexible time constants, adding full wave sidechain detection for improved dynamic response, and widening the range of threshold and ratio controls.ĭelivering the powerful sound of these iconic designs with enhanced flexibility for the modern age, the Shelford’s diode bridge compressor is a dynamic tool equipped to make a statement on virtually any mix or track. Like the Inductor EQ and Transformer Gain microphone preamp, the Diode Bridge Compressor in the Shelford Channel is based on the same topologies found in Rupert’s vintage designs – but refined & adapted for the modern engineer.
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