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Classic tube and solid-state tones with 1176-style compression and professional A/D conversion.

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.

Track through meticulously designed UA tube preamp circuitry

Blend tube and solid-state textures for tons of flexibility

Harness classic 1176-style compression on each mic channel

Add 8 inputs to any Apollo interface via ADAT optical connection

Bring your Mic Collection to Life with a Wide Range of UA Preamp Tones

Bring your Mic Collection to Life with a Wide Range of UA Preamp Tones

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.

A Legendary Compression Circuit

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

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.



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 2.2MΩ 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
75Ω BNC work clock I/O
Digital outputs anti-pop protection on power-up


Universal voltage internal power supply
Heavy-duty metal construction, two-space rack unit
One year warranty including parts and labor

Customer Reviews

4-710d Four-Channel Tone-Blending Mic Preamp w/ Dynamics

Overall Rating



June 19, 2024


I use it mostly for vocals it performs great and is light years ahead very good device I recommend


December 2, 2021

Reliable product

Realy nice reliable product, I am using it in live classical recordings, very smooth, rich sound..One more good place to record with it is the bass guitar line in, fantastic...

b. avner

February 5, 2021

1 word

this is my go to dream preamp when recording, Bass, Drums and FET mics. The sound of the classic 710, very rich in harmonics, unbeatable for the price, this is really a worthy and accessible pice of equipment for any professional or home studio.

R. Byers

September 19, 2020

Transformer to Tube Bliss

Among other uses, this unit really shines for me as a DI for my guitar. The Trans to Tube blend knob pushed to the tube side really helped tame that digital bite of my amp sims. Paired with the UAD Marshall Plexi it gets deep sounding.


May 30, 2020

Perfect choice for a mobile rig

I own an Apollo x8, that coupled with this pre, offers an easy way to travel with 16 channels. Just link my API Audio 3124V to the 4-710d and that's it. 4U=16 tracks.
4-710d offers an incredible pallete through its blend mode (tube/discrete), and the 1176 style compressor is very handy. Definitively very good investiment.

P. M

April 11, 2020

A perfect with Apollo

I own a UAD Apollo8 & 4 710D, It's a perfect 16 channels setup mobile or in studio. The best of analog Pre's to digital mixing. 4-710d shines on Trans to Tube with a 1176 style compressor that comes very handy on Drums.

M. Di Lorenzo

March 23, 2020

My best investment so far

I got the 4-710D around 6 years ago, thinking I would add a different preamp toaste to the ones I already have. Pretty soon I ended up using it in almost everything. A mix with some valve setting, with a fast comp is ideal for voices; full valve at DI and you've got a great bass preamp; full transistor and snares are bright and solid. Do yourself a favor: get a patch-bay and use EVERY ins and outs, possibilities are endless with this unit. I couldn't be happier. Thanks.

B. Lena

January 27, 2020

a well conceived preamp with super quality/price ratio

I use it on all. Great upright bass with transistor and a touch of tube and compressor. Low gain. Perfect. Thanks

l. helan

September 13, 2019

a great preampli

Since that I use the 4 710 d channel my recording are better and more clear. I like specially the compressor

R. Van Belle

October 29, 2018

Works on all types of microphones and electric guitars

Awesome piece of equipement: high quality. Very musical compressor, more versatile than you would expect. Also the ADC sounds very transparent, on par with more expensive tools. Will keep this box in my studio forever.

C. Knox

October 3, 2018

Swiss Army Knife????

Absolutely amazing piece of gear! incredible - all kudos to the team at UA - I have spoken to Bill Junior on the phone he's a great guy running and building a-great company with great products...keep up the good work guys!!

C. Scott

September 30, 2018

Sounded Pretty good...When it worked

I had this for 6 months and it spent about 2 months in the shop. 1st trip channel 1 had a drastic (~15dB) Difference at same settings Sent to sweetwater for repair. 2nd trip about a month later Meter Failure followed by Loss of channels 1 & 4. Sent to UA for repair and promptly sold. I really liked it when i had it but i was so discouraged by all the fixes that i just bought a 2nd apollo instead. Do yourself a favor and just get a 2-610. I liked all the features on the unit, the compressor the extra converters the tube transistor knob but it just didn't work.

J. Griffin

July 15, 2018

4-710d Four-Channel Tone-Blending Mic Preamp w/ Dynamics

Beautiful sounding preamps from clean to mean. The wide tonal range available allows full control of harmonic content and character. Simple dynamics controls work well on all types of sources. Converters sound fantastic and have an analog vibe that is full, with a tight low presence, detailed mids, and bright high end that is pleasing and never harsh. This is one of the best deals available on the market. 4 Preamps w/ dynamics and 4 Inserts for a total of 8 channels of AD conversion on DB-25 or ADAT! Definately a lot of bang for the buck and an outstanding unit.

J. Griffin

February 22, 2018

Four fantastic preamps and 4 inserts of UA A/D Conversion is a fantastic deal!

This 4 Channel preamp allows a blending of Tube & Class A in the preamp to taylor to your liking and source material. Has "1176" style flavored Dynamics on each channel w pad / phase / 48V Phantom and 2 settings for compressor. Features 8 channels of excellent A/D conversion up to 192, 4 for preamps and 4 as inserts you can use for other studio equipment. (At 192 only 4 of the 8 channels work) This unit is worth twice what they are asking for it! Preamps are the 710 and sound great on all sources. I start in the Class A side and blend in the tube warmth and character needed. If you put it all the way to the tube side you will notice the noise floor, though class A side has negligible noise. I have used the inserts for converting many sources and the converters sound warm and musical. I really like the built in compressor when recording electric guitars or ambient / Room mics. The pre also really shines on vocals. I bought mine when they were offering a free Octo-Core which helped me decide to pull the trigger. Even without it, it would have been an excellent purchase for what I feel I received. A studio full of these pres really would need no others.

C. Posada

February 16, 2018

Versatile and powerfull machine!!

This preamp is a really good choice if you need more channels with great quality in your studio.
The sound could be transparent if you want, and you can also feed the tubes and get big warm sound. It is very versatile-
Having an 1176 compressor on the chain is one of the greatest features of this machine. It is a dream to have 4 channels of an 1176 ready to use. Having 8 AD converters with the quality of UAD makes this unit even sexier.
If you need only one channel look somewhere else. Like the 610 or another brand. But if you need more than 2 channels with great features this thing is hard to beat.

i. Keszeg

January 28, 2018

amazing tool

this is exactly what i was looking for for versatile capability and great sound. i use it in combination with the apollo. it's the perfect team together.
the tone blending knob is great, helps you find the exact sound you want for the source. i recommend this amazing preamp.

G. Gunn

December 7, 2017

UA 4-710d

Simply stunning quality from UA again. Can't recommend it highly enough. Four channels of quality in one unit.

I. Arteaga

November 16, 2017

Great Box!!

I love the sound of the Pre Amps plus the digital out makes it perfect complement for Apollo interfaces!

T. Koeroglu

November 16, 2017

UA Apollo and 4-710d Four-Channel Tone-Blending Mic Preamp Together!...

UA Apollo and 4-710d Four-Channel Tone-Blending Mic Preamp Together! absolutely easy and great sounding solution for mobile recording. Thanks UA!...

J. Mayer

November 13, 2017


I love my 4-710d. Use it to record everything and get great sounds every time. The compression is fantastic as well and the quality of the A-D conversion is stellar. I've recommended this box to several friends who've all had similar results in their studios.