Rupert Neve Design Shelford Microphone Preamplifier with EQ and Compression

The Shelford Channel is built around Rupert Neve’s first new transformer-gain, class-A microphone preamplifier in over 40 years, a “best-of-the-classics” inductor EQ section, a tone-packed diode bridge compressor, the power of variable Silk saturation, a new dual-tap transformer output stage, and twice the operating voltage of vintage designs.

Features:

XLR Microphone, Line & 1/4" DI Inputs
XLR Line Output and -6 dB Line Output
1/4" Side Chain Send and Return
High, Low-, and Mid-Frequency Control
VU Meter Calibrated in dB
Texture for Tuning of Harmonic Ratio
Phase Inverts the Polarity of the Signal
48V Phantom Power for Mic Input
Ground Lift Switch
Includes Power Cable

Specifications:

MIC PREAMP:
- INPUT IMPEDANCE: 2200 Ohm
- MAXIMUM INPUT:
  - +21.5 dBu from 150 Hz to 22 kHz
  - +8 dBu 20 Hz to 22 kHz
- NOISE:
  - Un-weighted, 22 Hz-22 kHz, source impedance 150 Ohm balanced.
  - Main Out @ unity gain -100.9 dBu
  - -6 dB Out @ unity gain -106.6 dBu
  - +30 dB gain (Main Out) -91.37 dBu
  - +66 dB Gain (Main Out) -64.1 dBu
  - Equivalent Input Noise -121.37 dBu
- FREQUENCY RESPONSE: +/-0.25 dB from 17 Hz to 45 kHz
DIRECT INPUT:
- MAXIMUM INPUT: 8 dBu @ 20 Hz to 120 kHz
- NOISE (MAIN OUTPUT): -100 dBu (22 Hz to 22 kHz)
LINE INPUT:
- MAXIMUM INPUT LEVEL: +30.5 dBu 20 Hz to 30 kHz
- TOTAL HARMONIC DISTORTION AND NOISE:
  - @ 1 kHz, +20 dBu output level, no load: Better than 0.002%
  - @ 20 Hz, +20 dBu output level, no load: 0.05% Typical (2nd and 3rd harmonic)
- NOISE (MAIN OUTPUT):
  - Un-weighted, 22 Hz - 22 kHz, source impedance 40 Ohm balanced, no load.
  - -101.1 dBu
- FREQUENCY RESPONSE:
  - +/- 0.25 dBu from less than 10 Hz to 110 kHz
  - -0.32 dB @ 120 kHz
- MAXIMUM OUTPUT LEVEL: +26 dBu @ 16 Hz to 20 kHz
TOTAL HARMONIC DISTORTION AND NOISE WITH SILK ENGAGED:
- RED:
  - MIN TEXTURE @ 100 Hz, +20 dBu input level, no load: 0.0131%, mostly 3rd harmonic (typical)
  - MAX TEXTURE @ 100 Hz, +20 dBu input level, no load: 1.66%, mostly 2rd harmonic (typical)
- BLUE:
  - MIN TEXTURE @ 100Hz, +20 dBu input level, no load: 0.0079%, mostly 3rd harmonic (typical)
  - MAX TEXTURE @ 100Hz, +20 dBu input level, no load: 0.941%, mostly 2rd harmonic (typical)
HIGH PASS FILTER:
- Continuously variable swept frequency from 20 Hz to 250 Hz.
- Slope: 12 dB/Octave
EQ NOISE: Un-weighted, 22 Hz-22 kHz: -92 dBu
SIGNAL PRESENT: Illuminates GREEN when input stage signal level reaches -20 dBu
OVERLOAD INDICATOR: Illuminates RED when input stage signal level reaches -23 dBu
DIODE BRIDGE COMPRESSOR:
- NOISE (BW 22 Hz – 22 kHz):
  - 0 dB Makeup Gain: -84.5 dBu
  - +20 dB Makeup Gain: -64.2 dBu
- TIME CONSTANTS:
  - Measurements taken represent full range achievable between 1.5:1 Ratio and 8:1 Ratio setting.
  - 0 dBu I/P 1kHz Burst Tone used for all recorded measurements.
  - Fast (TC1): Attack 180µS — 1.8mS // Release 100mS – 150mS
  - MedFast (TC2): Attack 750µS – 5.25mS // Release 160mS – 250mS
  - Med (TC3): 2.7mS – 18mS // Release 350mS – 525mS
  - MedSlow (TC4): 4.6mS – 38mS // Release 600mS – 1 S
  - Slow (TC5): 11mS – 72.5mS // Release 800mS – 1.25 S
  - Auto (TC6): 5.75mS – 35.5mS // Release T1 400mS – 850mS, T2 TBD
  - “Fast” Mode Multiplier: Modifies aforementioned TC’s by 70% of original value
PRODUCT DIMENSIONS: 19” (48.3 cm) x 10.5” (26.7 cm) x 1.75” (4.4 cm)
SHIPPING DIMENSIONS: 24” (61 cm) x 13” (33 cm) x 4” (10.2 cm)
SHIPPING WEIGHT: 12.25 lbs. (5.5 kg)

Mic Preamps

Rupert Neve Design Shelford Mic Preamp with EQ and Compression