Universal Audio

Description

The Universal Audio 4-710d is a boutique quality, 4-channel microphone/line preamplifier with unique tube and solid state tone-blending capabilities-perfect for a wide range of microphone and instrument sources. This versatile multichannel preamp offers selectable 1176-style compression circuitry on each channel, plus four additional line inputs feeding 8 channels of pristine analog-to-digital conversion. Building upon UA's classic analog design approach, combined with smart modern features, the 4-710d is the most flexible preamp in the UA lineup.

At the core of the 4-710d are four channels of tone-blending "Twin-Finity" mic preamps with true-bypass 1176-style compression, including specially tuned "fast" and "slow" settings. Each of the four mic preamp channels allows for continuously variable phase-aligned tone, between a 100% tube and 100% solid state signal path. Send and return jacks are available for external processing or signal access.

The eight analog inputs are digitized via ultra high-quality 24-bit A/D converters at selectable sample rates up to 192kHz. Digital output is available via dual ADAT "lightpipe" or AES/EBU DB-25 connectors, facilitating integration with most popular audio interfaces.
Features
Preamplifiers
  • 4 TEC Award-winning 710 Twin-Finity microphone/line preamps, each featuring:
  • Dual-path 285-volt Class-A tube and transimpedance solid state preamps
  • Phase-aligned tone-blending of tube and solid state circuits, creamy to crunchy
  • Newly designed 1176-style compression circuit per preamp channel
  • JFET Direct Input with 2.2MÃŽ ultra Hi-Z impedance w/auto input override
  • Large backlit VU meters for flexible metering of input drive, gain level, and gain reduction
  • Balanced send/return inserts (half-normalled)
  • 48V phantom power
  • 75Hz low cut filter
  • Polarity switch
  • Monolithic balanced output stage
Analog-to-Digital Conversion
  • 8 channels of high quality 24-bit A/D conversion:
  • Selectable sample rates up to 192kHz
  • Digital output via dual ADAT optical and AES/EBU DB-25 connectors
  • 8-channel soft limiter (switchable for all channels)
  • Ultra-low jitter clock subsystem
  • LED metering array with clip/hold indicators
  • 75ÃŽ BNC work clock I/O
  • Digital outputs anti-pop protection on power-up
Other
  • Universal voltage internal power supply
  • Heavy-duty metal construction, two-space rack unit
  • One year warranty including parts and labor
Specifications
Analog Section, Channels 1-4
  • Note: all specifications are typical performance unless otherwise noted. Unless otherwise noted, all specifications are 20Hz-20kHz, minimum gain, maximum level, 24-bits, all switches in neutral or off mode, 100% solid state, digital output = 0dBFS.
Microphone Preamplifier to Line Out:
  • Gain Range: 56dB
  • Min Gain: 14dB
  • Max Gain: 70dB
  • Max Input Level (bal): 6.7dBu
  • Max Output Level (bal): 20dBu
  • Input Impedance (bal): 2kÃŽ
  • Input Impedance (Hi-Z): 2.2MÃŽ
  • Output Impedance (bal): 600 ÃŽ
  • Equiv. Input Noise (150ÃŽ, 56dB gain): -127dBu
  • Frequency response (20Hz-20kHz): +0.1/-0.15dB
  • Crosstalk (max gain, 1kHz): < -115dB
Low Cut Filter:
  • Type: Bessel 2nd Order
  • Corner Frequency: 75Hz
  • Attenuation (20Hz): -23dB
Pad:
  • Attenuation: 15dB
Phantom Power:
  • Phantom Power Current (per jack): 10 mA
  • Voltage: 48V ±1V
Compressor:
  • Threshold: 10dBu
  • Compression Ratio: 4:1
  • Fast Attack Time: 0.3ms
  • Fast Release Time: 100ms
  • Slow Attack Time: 2.0ms
  • Slow Release Time: 1100ms
Analog-To-Digital Converter Section
  • Note: all specifications are typical performance unless otherwise noted. Unless otherwise noted, all specifications are 20Hz-20kHz, minimum gain, maximum level, 24-bits, all switches in neutral or off mode, 100% solid state, -1dBFS output.
Microphone & Line Inputs (Ch 1-4):
  • THD+N (-1dBFS): -100dB (0.001%)
  • SNR (A-Wt): 110dB
  • Dynamic Range (-60dBFS, A-wt): 110dB
  • Frequency response: +0.1/-0.15dB
  • Stereo Phase: <0.3 deg
Line Input (Ch 5-8):
  • THD+N (-1dBFS): -103dB (0.0007%)
  • SNR (A-Wt): 117dB
  • Dynamic Range (-60dBFS, A-Wt): 117dB
  • Frequency response: ±0.1dB
Warranty
One year parts and labor warranty on all U.A. products and Kind of Loud products.

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