The 4-710d from Universal Audio is a high-end, 4-channel microphone/line preamplifier with tube and solid-state tone blending capabilities.

The dual signal path is perfect for a wide range of microphone and instrument sources, with each channel offering selectable 1176-style compression circuitry. Four additional line inputs feed 8-channels of pristine analog-to-digital conversion.

The 1176-style compression include specially tuned "fast" and "slow" settings, and can be completely switched out of the signal chain. Each of the microphone 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 8 analog inputs are digitized via ultra high-quality 24-bit analog to digital converters at selectable sample rates up to 192kHz. Digital output is available via dual ADAT Lightpipe connectors (SMUX supported), or via a 25-pin D-sub connector for 8-channels of AES/EBU, allowing for easy integration with most popular audio interfaces.


Number of Channels 4 microphone inputs
8 inputs for AD conversion
Inputs 4 x XLR Microphone
4 x XLR Line
4 x 1/4" TRS phone (ch 5-8)
4 x 1/4" TRS phone Return
1 x 1/4" TS phone Instrument (front panel)
Output 4 x XLR
4 x 1/4" TRS phone Send
Other Connectors 1 x 25-pin D-sub AES/EBU output (8-channels)
2 x TOSLink ADAT optical output (SMUX supported)
2 x BNC Wordclock I/O
Phantom Power +48V switchable
Multi Function 8-channel 24-BIT analog to digital converter with selectable sample rates up to 192kHz
Gain Range Gain Range for Unit: -Infinity to 70dBu
Mic Range Gain: 10 to 60dBu
Line Range Gain: -10 to 40dBu
Hi-Z Range Gain: -10 to 40dBu
Maximum Input Level Microphone, gain @ minimum solid state: +18dBu
Microphone, gain @ minimum tube 1% THD: -7dBu, +8dBu w/pad
Line, gain @ minimum solid state: +30dBu
Line, gain @ minimum tube 1% THD: +8dBu
Hi-Z, gain @ minimum solid state: +18dBu
Hi-Z, gain @ minimum tube 1% THD: +8dBu
Maximum Output Level +18dBu into 600Ω
+28dBu into 100kΩ
Frequency Response 20Hz to 100kHz, +/-0.2dBu
THD + N Tube: 0.1% @ +4dBU
Solid-State: 0.005% @ +4dBU
Power Requirements 100~240VAC, 2.5A, 50/60Hz
Dimensions (WxDxH) 2U 19" rack mount
Weight Not specified by manufacturer
Specialties -15dB pad
75Hz high-pass filter

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