Shelford Diode Bridge Compressor
Compressor
From Rupert Neve Designs:
Since the early 1970s, Rupert Neve’s vintage 2254 and 33609 diode bridge compressors have been revered for the punch & thickness they bring to drums, instruments, and the mix bus. Originally developed for the acclaimed Shelford Channel, the Shelford Diode Bridge Compressor captures the soul of these coveted compressors while providing a host of modern updates, including advanced timing control, significantly lower noise, fully stepped controls throughout, higher voltage power rails, and internal parallel processing capabilities.
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.
By understanding the limitations of vintage units like the legendary 2254 & 33609, 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.
Specs
- Input impedance (XLR line input to XLR line output, compressor bypassed, 40 Ohm balanced source)
- 10K Ohm
- Output impedance
- 40 Ohm
- Maximum input level
- +4 dBu Selected: +26.7 dBu typical
- Maximum output level
- +26.7 dBu typical
- Noise
- 10 Hz - 120 kHz: -104 dBu typical
- Frequency response
- 10 Hz to 120 kHz: +/- 0.25 dB typical
- THD+N (22 Hz - 22kHz BW)
- @ 1 kHz @ Maximum Level: 0.0008% typical
- Compressor noise (22 Hz - 22kHz BW, 40 Ohm balanced source)
- @ 0 dB Make-up gain: -84.5 dBu typical; @ +20 dB Make-up gain: -64.5 dBu typical
- Compressor timing (full range between 1.5
- 1 and 8:1 ratio): FAST – Attack 250 μS - 2 mS // Release 100 mS - 200 mS typical; MF (MEDIUM FAST) – Attack 1 mS - 5 mS // Release 100 mS - 200 mS typical; MED (MEDIUM) – Attack 3 mS - 18 mS // Release 350 mS - 700 mS typical; MS (MEDIUM SLOW) – Attack 5 mS - 40 mS // Release 600 mS - 1 S typical; SLOW – Attack 10 mS - 80 mS // Release 800 mS - 1.5 S typical; AUTO – Attack 5m S - 40m S // Release T1 400-900 mS, T2 1-2 S typical
- Dimensions
- 1RU: 19” W x 8.25” D x 1.75” H (48.3 cm W x 21 cm D x 4.5 cm H)
- Weight
- 8.5 lbs. (3.9 kg)
Source: Rupert Neve Designs Shelford Diode Bridge Compressor (5254) product page