Universal Audio 4-710d Twin-Finity 4-Channel Mic Preamp (with 1176 Dynamics and A/D Conversion)

 

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Dale #:UNAU-4710D

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  • The Universal Audio 4-710d is a boutique quality, four-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 multi-channel preamp offers selectable 1176-style compression circuitry on each channel, plus four additional line inputs feeding eight 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.

    Features:

    • Four TEC Award-winning 710 Twin-Finity™ microphone/line preamps, each featuring:
    • Phase-aligned tone-blending of tube and solid state circuits, creamy to crunchy
    • Newly designed 1176-style compression circuit per preamp channel
    • Backed by 1-Year limited warranty

    Preamplifiers

    • Four 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 2.2M ohm 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
    • 75 Hz low cut filter
    • Polarity switch
    • Monolithic balanced output stage

    Analog-to-Digital Conversion

    • Eight channels of high quality 24-bit A/D conversion:
    • Selectable sample rates up to 192 kHz
    • 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
    • 75 ohm 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
  • Analog Section, Channels 1-4  
    MICROPHONE PREAMPLIFIER TO LINE OUT  
    Gain Range 56 dB
    Min Gain 14 dB
    Max Gain 70 dB
    Max Input Level (bal) 6.7 dBu
    Max Output Level (bal) 20 dBu
    Max Output Level (unbal) 14 dBu
    Input Impedance (bal) 2 kΩ
    Input Impedance (Hi-Z) 2.2MΩ
    Output Impedance (bal) 600 Ω
    Output Impedance (unbal) 300 Ω
    Equiv. Input Noise (150Ω, 56 dB gain) -127 dBu
    Frequency Response (20Hz-20kHz) +0.1/-0.15 dB
    Phase (Mic In to Line Out, 20 kHz) < 0.5 deg
    Stereo Phase Mismatch < 0.6 deg
    Stereo Level Balance (1 kHz) < 0.01 dB
    Crosstalk (max gain, 1kHz) < -115 dB
    Common Mode Rejection Ratio (max gain, 60 Hz) > 62 dB
    LINE IN TO LINE OUT  
    Gain Range 56 dB
    Min Gain -7 dB
    Max Gain 49 dB
    Max Input Level (bal) 26 dBu
    Max Input Level (unbal) 20 dBu
    Max Output Level (bal) 20 dBu
    Input Impedance (bal) 10 kΩ
    Input Impedance (unbal) 5 kΩ
    Output Impedance (bal) 600 Ω
    Output Impedance (unbal) 300 Ω
    Frequency Response (20Hz-20kHz) +0.1 / -0.15 dB
    Phase (Line In to Line Out, 20 kHz) < 0.5 deg
    Stereo Phase Mismatch < 0.5 deg
    Stereo Level Balance (1 kHz) < 0.2 dB
    Crosstalk (max gain, 1kHz) < -115 dB
    Common Mode Rejection Ratio (max gain, 60 Hz) > 70 db
    Tube @ 100% – LINE IN TO LINE OUT  
    Tube Complement 12AX7 (2)
    THD+N (19 dBu, 1 kHz, 20 kHz BW) -30 dB (3.1%)
    THD+N (17 dBu, 1 kHz, 20 kHz BW) -20 dB (1.0%)
    SNR (min gain, 1 kHz, A-wgt, 20 kHz BW) 109 dB
    SNR (max gain, 1 kHz, A-wgt, 20 kHz BW) 74 dB
    Solid State @ 100% – LINE IN TO LINE OUT  
    THD+N (min gain, 1 kHz, 20 kHz BW) -101 dB (0.0009%)
    THD+N (max gain, 1 kHz, 20 kHz BW) -70 dB (0.03%)
    SNR (min gain, 1 kHz, A-wgt, 20 kHz BW) 110 dB
    SNR (max gain, 1 kHz, A-wgt, 20 kHz BW) 82 dB
    Low Cut Filter Type Bessel 2nd Order
    Corner Frequency 75 Hz
    Attenuation (20 Hz) -23 dB
    Pad Attenuation 15 dB
    Phase Phase Shift 180 deg
    Phantom Power Phantom Power Current (per jack) 10 mA
    Voltage 48V ± 1V
    Compressor Threshold 10 dBu
    Compression Ratio 4:1
    Fast Attack Time 0.3 ms
    Fast Release Time 100 ms
    Slow Attack Time 2.0 ms
    Slow Release Time 1100 ms
    Limiter Threshold 17 dBu (= -3 dBFS)
    Attack Time 0.075 ms
    Release Time 100 ms
    Send/Return Send Level, Max (bal) 20 dBu
    Return Level, Max (bal) 20 dBu
    Send Level, Max (unbal) 14 dBu
    Return Level, Max (unbal) 20 dBu
    Analog Meter Switch, GR Comp. Gain Reduction
    Switch, Drive Tube Stage Drive
    Switch, Level Output Level
    Level, 0 dB VU, Drive Mode 12 dBu
    Level, 0 dB VU, Output Mode 4 dBu
    Analog-To-Digital Converter Section  
    Note All specifications are typical performance unless otherwise noted. Unless otherwise noted, all specifications are 20 Hz-20 kHz, minimum gain, maximum level, 24 bits, all switches in neutral or off mode, 100% solid state, -1 dBFS output.
    Microphone Input  
    THD+N (-1 dBFS) -100 dB (0.001%)
    SNR (A-Wt) 110 dB
    Dynamic Range (-60 dBFS, A-wt) 110 dB
    Frequency Response +0.1/-0.15 dB
    Stereo Phase < 0.3 deg
    Line Input (Ch 1-4)  
    THD+N (-1 dBFS) -100 dB (0.001%)
    SNR (A-Wt) 110 dB
    Dynamic Range (-60 dBFS, A-Wt) 110 dB
    Frequency Response +0.1/-0.15 dB
    Stereo Phase < 0.3 deg
    Line Input (Ch 5-8)  
    THD+N (-1 dBFS) -103 dB (0.0007%)
    SNR (A-Wt) 117 dB
    Dynamic Range (-60 dBFS, A-Wt) 117 dB
    Frequency Response ±0.1 dB
    Stereo Phase < 0.5 deg
    16-Bit Mode  
    Dither Type Triangular
    Sample Resolution 16 bits
    THD+N (-1 dBFS, 16 bits) -93 dB (0.0022%)
    SNR (A-Wt) 98 dB
    Dynamic Range (-60 dBFS, A-Wt) 98 dB
    Digital Output Section  
    Digital Output Formats AES/EBU 8 channels, 44.1-192kHz, single wire
    ADAT Optical 44.1-48kHz:
    Port 1 = channel 1-8
    Port 2 = channel 1-8 (duplicate out)
    88.2-96Khz (S/MUX™):
    Port 1 = channel 1-4
    Port 2 = channel 5-8
    176.4-192kHz (S/MUX™):
    Port 1 = channel 1-2
    Port 2 = channel 3-4
    Bit Depths 24-Bit
    16-Bit (dithered)
    Clock Options Internal (crystal)
    44.1, 48, 88.2, 96, 176.4, 192 kHz
    Word Clock
    44.1, 48, 88.2, 96, 176.4, 192 kHz
    Lock range ±3%
    Optional termination (75 ohms)
    A/D Metering Bottom segment: Green, -37 dB to -6 dB
    Top segment: Yellow, -6 dB to -1 dB
    Top segment: Red, -1 dB to Clip
    Connector Types  
    External Connections (rear panel) 8 x XLR Female Line in, Mic in (channel 1-4)
    4 x XLR Male Line out (channel 1-4)
    12 x ¼” TRS Female (ch 1-4 send, return, line in 5-8)
    2 x Toslink out (ADAT Optical output 1-8)
    2 x BNC 75Ω (Word Clock in, out)
    1 x DB-25 (AES/EBU Tascam pin-out, ch 1-8)
    External Connections (front panel) 4 x ¼” TRS Female (channel 1-4 Hi-Z in)
    Mechanical and Power  
    AC Requirements 100VAC - 240VAC, 50/60 Hz, auto-switching
    Maximum Power Consumption 0.525 A @ 120 VAC (60W)
    Power Connector Detachable IEC power cable
    Dimensions 2U Rack
    19” x 3.5” x 12” (W x H x D) inches
    48.2 x 8.9 x 30.5 (W x H x D) cm
    Weight 11.5 lbs (5.2 kg)
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