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)