AKG® BX 20 Spring Reverb
The only AKG-licensed emulation of this one-of-a-kind spring reverb.
Introduced in the late 1960s, the AKG BX 20 reverb was a high-water mark for AKG’s esteemed engineers. An ingenious assembly of mechanical and electronic componentry, the BX 20 offered the glorious depth and color of spring reverb without any of the limitations.
The AKG BX 20 Spring Reverb plug-in for UAD-2 hardware and Apollo interfaces is exclusively endorsed by AKG Acoustics, Austria and envelops your sources in gorgeously dark, dense ambience that only spring reverb can provide.
Mix with the only licensed and endorsed AKG Acoustics BX 20 reverb plug-in
Envelop instruments in dark, dense, clear ambience with original dual spring tank configuration
Harness new "plug-in only" features like stereoized A/B Tank Select, Direct signal defeat, and BX 10 Tone controls
Mix with artist presets from Patrick Carney (The Black Keys), Vance Powell (Jack White), and Jacquire King (Kings of Leon)
Take a Listen
5-Minute UAD Tips
Featuring the AKG BX 20 Spring Reverb.
The AKG BX 20's utterly unique character makes it a versatile tool for ambience as well as tone shaping. Its sonic personality features the quick onset of a classic plate reverb, and also the natural-sounding density and diffusion of a chamber — with little of the flutter or “boing” artifacts common with other spring reverbs. Unlike other spring reverb emulations, Universal Audio's hybrid delay network/convolution design provides the only plug-in representation of this mechanically controllable, acoustic ambience system. To that end, UA obsessively emulated a “golden unit” BX 20 from legendary producer, Jon Brion.
The BX 20 plug-in expertly captures the hardware’s unique two-stage decay. This yields warm, organic sounds whether it’s applied on percussion, vocals, or guitars, adding a unique timbre that can make individual tracks stand out — or melt away — in your mix. Short textures are chock full of colorful depth and dimension, while longer decays are rife with lush three-dimensionality, while never washing out.
New Features, More Control
The BX 20 plug-in provides the complete sound and features of the original, plus new "Mk II" features for an expanded sound palette. Tank Select provides the exact sound of the original A/B dual tank system, but includes a “stereoized” tank A or tank B, for more balanced stereo imaging. The Direct function allows you to mute the tank's direct signal for more control and minimizing conflict with the source audio — perfect for buses. The Baxandall-type tone controls — borrowed from the smaller AKG BX 10 — offers the last bit of seasoning to tailor your reverbs.
“When I heard UA was emulating the AKG BX 20, I dared them to beat my hardware – they did it.”
– Vance Powell (Jack White, The Dead Weather, The Raconteurs)
“This is the vocal reverb sound I’ve had in my head for over 20 years. I will never mix without it again.”
– Jeff Juliano (John Mayer, Shinedown, Train)
“I used the UAD AKG BX 20 plug-in during editing sessions for the new Missy Elliott single, "Where They From," produced by Pharrell. The tone instantly cut through on the vocals and percussion.”
– Mike Larson (Pharrell Williams, Daft Punk, Snoop Dogg)
“The AKG BX 20 Spring Reverb plug-in fits into tracks in fantastically unexpected ways.”
– John Paterno (Robbie Williams, Badly Drawn Boy, Bonnie Raitt)
“What a fat sounding, vibey reverb — I've been using it on everything! Its maiden voyage was mixing a couple Don Henley tracks.”
– Jeff Balding (Taylor Swift, The Eagles, Florida Georgia Line)
Watch The Reviews
June 8, 2022
Analogue spring reverb in the digital medium
Well done UAD. This is pretty much spot on. Again one of the keys to UAD modeling success is there are no harsh edges to the sound quality (if used correctly). Lots of controls to mess...Read More
May 7, 2022
I love this for my voice and amazing reverb for meRead More
April 6, 2022
Great sounding reverb, specifically bought to help Ukrainian peopleRead More
March 30, 2022
Smooth & Gorgeous
It doesn't have the "boing" I usually think of in a spring reverb, but it's pretty incredible nonetheless. It can handle punchy hits without losing articulation, or it can provide...Read More
January 17, 2022
Go to reverb.
Fantastic reverb! Very musical. Works perfectly on guitars, vocals, even drums. UAD must have!Read More
January 15, 2022
The best spring reverb plugin I ever tried, and I tried all. Cheers!Read More
Input Select, Mono/Stereo: Changes input between summed mono or stereo
Tank Select, A / B / A+B: Under stereo use, changes tank options among stereoized "A" and "B" and original "A+B" configurations
Direct, Off / On: Disables/enables the spring tank's naturally occurring direct sound component
Low Cut, Off / 80 Hz: 12 dB per octave, 80 Hz filter
Bass, ±10: Continuous tone control borrowed from the AKG BX 10, ±8 dB at 150 Hz
Treble, ±10: Continuous tone control borrowed from the AKG BX 10 ±4 dB at 5 kHz
Dry/Wet, 0 to 100%: Continuously adjusts Dry and Wet signals under insert use case
Wet Solo, Off/On: Disables/enables Wet Solo function
Predelay, 0 to 250 milliseconds: Continuously adjusts Predelay amount
Channel 1 Decay, 2 to 4.5 seconds: Continuously adjusts Channel 1 Decay time
Channel 2 Decay, 2 to 4.5 seconds: Continuously adjusts Channel 2 Decay time
Channel 1 Volume, ∞ to +24 dB: Continuously adjusts Channel 1 Volume
Channel 2 Volume, ∞ to +24 dB: Continuously adjusts Channel 2 Volume
Channel 1 Pan, ±100: Continuously adjusts Channel 1 Pan
Channel 2 Pan, ±100: Continuously adjusts Channel 2 Pan
Link, Unlinks/Link: Unlinks/Links Decay, Volume and Pan parameters
Mix: Continuously blends processed and unprocessed signal
Power, Off/On: Disables/Enables plug-in (all DSP processing is bypassed)
AKG BX 20 Spring Reverb
TOO ... MUCH ... DSP
This is truly a great sounding reverb, and using it is a treat (as I know Jon Brion). BUT---and this is a substantial BUT--it eats up so much processing power that I find myself turning to other UAD reverbs (Lexicon) and excellent plug-ins by Baby Audio and Valhalla. Those reverbs are in no ways compromises... they sound amazing and allow my mixes to run flawlessly. I think that's why you've seen this come down in price so much... it's become a back-shelf reverb for me because while its colour is unique, it conjures up the Mac "beach ball of death" if I try to rely on it too much. If you've only got so much to spend in UA Land, go for the Lexicon 224 ... and then buy the Valhalla Vintage Verb, one of the most outstanding, unsung reverbs on the planet and used on every mix I do.
Analogue spring reverb in the digital medium
Well done UAD. This is pretty much spot on. Again one of the keys to UAD modeling success is there are no harsh edges to the sound quality (if used correctly). Lots of controls to mess about with to alter the tonal quality of the verb. Granted early days in my use of the plug-in but initial impressions are good. It's a spring reverb but in the box.
I love this for my voice and amazing reverb for me
Great sounding reverb, specifically bought to help Ukrainian people
Smooth & Gorgeous
It doesn't have the "boing" I usually think of in a spring reverb, but it's pretty incredible nonetheless. It can handle punchy hits without losing articulation, or it can provide a dense, luxurious fog. It doesn't have an enormous range of sounds, but you can really tweak & dial in the sounds it does have.
Go to reverb.
Fantastic reverb! Very musical. Works perfectly on guitars, vocals, even drums. UAD must have!
The best spring reverb plugin I ever tried, and I tried all. Cheers!
I can't stop using this at the moment... Guitars and vocals.
A must if you play guitar
This is the only reverb i need when i plug my guitar. UAD Fender with this reverb is the perfect combo
Best "dark" reverb
Immediately creates the right mood with Bass VI, snare drum, and vocals. Highly recommended!
No-one does it better...baby you're the best!
After trying it out I had to have it. Convo's don't nail it like this does and nothing ever made does what the BX20 does. IMHO in a mix it's sounds no different to the classic hardware unit. UA hit a home run again!
As close to the real thing as the real thing
This thing is amazing. Using the real thing is great, but you only get one and have to print it in. This is so close it's ridiculous.
Another magic wonder box
There’s no UAD plug in that hasn’t changed my life :)
The only obstacle it’s me. There’s no limit to creativity with this machines.
Working With it on a project at the moment. So far i am pleased as can be! Sounds amazing!
The Best Spring Reverb Plugin Without A Doubt & My Absolute Favorite UAD PLUG-IN!!!
Just Love it on Every Mix!!!
Beautiful spring reverb magic!!
I was thinking, sure the UA team can port over the classic digital reverbs as those are digital algorithms to start with. And yes, those sound perfect when I compare side by side with the originals. However this spring emulation is off the charts. It is literally an extension of your sound, like its own physical instrument. This emulates all the natural spring characteristics beautifully.
My new favourite reverb!
I never really considered this reverb, but once I tried it I HAD to buy it, I have an eventide h8000fw that’s great for verbs but the AKG just has a beautiful quality to it that just feels so real and natural, that really has a unique vibe to it that I haven’t heard elsewhere, a must have!
Love this one.
Don't get me wrong. I really love this one. Probably just me, but I could really use a more sophisticated EQ than just a Tone Control. And also an adjustable low-cut filter instead of a static one . Kinda like the EQ/HPF on the EMT 140.
Problem is, I often find springs and reverbs to be a bit dark, and tend to disappear when a mix get a tad to busy, making me want to boost the upper mid/hi's and cut the lows.
But I do love the sound of it. I can always use it on a send followed by an agressive EQ like the API 560. That would be perfect. You still get all the stars, as I do love the sound. I would just have loved a Parametric EQ and an adjustable HPF, to avoid having to use it on a send. ;-)
One of the best spring reverbs I've heard.
The perfect reverb to add a darker, more dense space to instruments. Unlike traditional spring reverbs, no metal-like artifacts are heard. Its versatility stems from turning on/off the direct signal, selecting different tanks, mono/stereo operation, linking/unlinking channels, and so forth. An amazing achievement by UA.