Universal Audio UA-4710D 4-Channel Tone-Blending Microphone Preamplifier

By merging the best of UA’s classic analog design with smart modern features and workflow enhancements, the 4-710d is the most flexible microphone preamp in the UA lineup.

Featuring four high-end mic/line preamps with a unique tube/solid-state tone blending circuit, as well as classic 1176-style compression on each mic channel, the 4-710d also offers tons of digital I/O to expand your setup.

At the core of the 4-710d are four channels of tone-blending “Twin-Finity” mic preamps. Each channel offers 100% tube and 100% solid-state signal path, as well as the ability to continuously blend between the two circuits. This gives you tons of textures — from creamy to crunchy — and lets you dial in the perfect amount of tube grit or solid-state sheen.

Features

• Four TEC Award-winning Twin-Finity™ mic/line preamps with tube/solid-state blending
• Continuously variable tone control: creamy tube saturation to clean solid-state clarity
• Per-channel 1176-style compression with fast/slow modes
• JFET direct inputs with ultra Hi-Z impedance (2.2MΩ) and auto input override
• Large backlit VU meters for input, gain, and gain reduction monitoring
• Balanced send/return inserts per channel
• Built-in 48V phantom power, 75 Hz low-cut filter, and polarity reverse
• Eight channels of 24-bit A/D conversion up to 192 kHz
• Digital output via dual ADAT optical and AES/EBU DB-25 connectors
• Switchable 8-channel soft limiter and ultra-low jitter clocking
• Heavy-duty 2U rackmount chassis with universal power supply

A Legendary Compression Circuit
Each of the 4-710d’s four channels features true-bypass 1176-style compression, including specially tuned "fast" and "slow" settings. This enables quick, on-the-fly tweaking for fattening up a vocal, hold a bass guitar in place, or for adding sizzle and texture to synths and horns.

Add Inputs and Professional A/D Conversion
With eight analog inputs, the 4-710d is perfect for expanding your studio. Digitized via ultra high-quality 24-bit A/D converters at selectable sample rates up to 192 kHz, the 4-710d easily connects to most interfaces with its dual ADAT optical or AES/EBU DB-25 connectors.

Specifications

Preamplifiers
- 4 × Twin-Finity™ mic/line preamps (tube + solid-state blendable)
- Tube Path: 285V Class-A tube circuit
- Solid-State Path: Transimpedance preamp
- Compression: 1176-style with “Fast” and “Slow” settings
- Inserts: Balanced send/return (half-normalled)
- Direct Input: JFET DI, 2.2MΩ impedance
- Phantom Power: +48V
- Low Cut Filter: 75 Hz
- Polarity Switch: Yes

Analog-to-Digital Conversion
- 8-channel, 24-bit A/D conversion
- Sample Rates: Up to 192 kHz
- Outputs: Dual ADAT optical, AES/EBU DB-25
- Soft Limiter: Switchable on all channels
- Clocking: Ultra-low jitter, 75Ω BNC word clock I/O
- LED Metering: Clip/hold indicators, input level

Electronics
- Output Stage: Monolithic balanced
- Power: Universal voltage internal supply

Hardware
- Rack Size: 2U
- Construction: Heavy-duty metal chassis

Measurements
- Gain Range: Up to 70 dB (varies with blend and input)
- Distortion: <0.5% THD (50 Hz–15 kHz, with limiting)
- S/N Ratio: >70 dB at +10 dBm

Accessories
- Warranty: 1-year limited (parts & labor)