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Universal Audio 4-710d 4-Channel Twin Finity Mic Preamp

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.

Universal Audio 4-710d 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 2.2M? 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
• 75? 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.

Universal Audio 4-710d Specifications:

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): 2k?
• Input Impedance (Hi-Z): 2.2M?
• Output Impedance (bal): 600 ?
• Equiv. Input Noise (150?, 56dB gain): -127dBu
• Frequency response (20Hz-20kHz): +0.1/-0.15dB
• Crosstalk (max gain, 1kHz):

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:
• 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
• Stereo Phase: