Best Mastering Compressors: Top 9 Units For Your Mastering Studio! (2023)

Top 9 Mastering Compressors


Mastering is the last step before finishing your song. The cherry on top of the cake you baked. This is a process mainly done by a different engineer, but nowadays there are one-man-army style producers and engineers that do it all by themself.

This process requires a completely different skillset and with that – different gear in comparison with your mixing units. And with that being said, when we are in the dynamic range process of mastering, there are the mastering compressors.

Here in this article, we are going to review what we think are the best mastering compressors and we included 9 monsters of compressors for this stage of production. Below you will be able to find some brief details on each one of them.

Also, we are not going to list them from best to worst, since they are all amazing and used in different setups – which one you pick, will need to be your decision at the end, so let’s check them out!

1. Manley Variable Mu Stereo Limiter Compressor

The famed Manley Stereo Variable Mu Limiter/Compressor is a favorite of producers and recording engineers – and one listen to what this machine does on your sound will make you a believer, too! Anybody who has heard the traditional Fairchild 670 Series limiters in motion has thought of this Variable Mu’s capabilities – however, the sound is even sweeter with the Variable Mu.

It has adjustable attack and release settings that are optimized for mixing and mastering but are versatile for many monitoring situations. Sonically versatile and reliable for daily use, the Variable Mu is Manley’s best-selling gadget.

Though Variable Mu is just not a clone, the Fairchild 670 sequence used an identical limiting principle and those that are aware of that piece of gear know this methodology to be very particular. In reality, with “mu” which means gain or amplification factor, the Variable Mu gives the true variable gain, not like most units.

The way it works is that the distinctive 5670 twin triode is at the heart of the peak-reducing and compression action – and it is continuously being re-biased by the vacuum tube rectified side-chain management voltages. This causes the tube to easily change its gain.

The Variable Mu’s Compress mode is a soft-knee 1.5:1 ratio whereas the sharper knee Limit mode begins at 4:1 and strikes to an extra dramatic ratio of 20:1 when limiting over 12dB. Apparently, the knee truly softens as more limiting is used. Distortion can be creatively utilized by turning up the Input and turning down the Outputs while using very little or no compression.

Manley Variable Mu Stereo Limiter Compressor

  • Balanced Inputs and Outputs
  • Variable Gain vacuum tube (per channel): 5670
  • Hard-wire Bypass switch
  • Recovery 5 steps: 0.2s, 0.4s, 0.6s, 4sec, 8sec
  • Variable Attack: 25msec–70msec
  • Switch for Limit or Compress modes
  • Limit (4:1 to 20:1) or Compress (1.5:1)
  • Stereo Link switch
  • Front-panel mounted Meter calibration
  • Large Illuminated Sifam Meters

For EU
Manley Variable Mu Stereo Limiter Compressor

2. Tube-Tech SMC2B

The TUBE-TECH SMC 2B Stereo Multiband Compressor has three unbiased optical stereo compressors. Combining the impact of wide 3-band level management with individual compression of the three bands creates pure magic, particularly on the main mix bus, but in addition to sub-mixes and for mastering purposes.

The SMC2B is likely one of the few audio processors, that may be very hard to bypass, even after a brief listening test, and it will have a tendency to remain inserted forever due to the color and dynamics it could actually add to your source materials. Try it for mastering, and listen to the magic no different compressor can ship! For Live use, the SMC2B is including high quality and musicality to top touring acts.

As an additional bonus function, SMC2B will also be used to resolve/remove annoying frequencies in basses, vocals, and so forth. It will possibly even be arranged as a de-esser. SMC2B can be very efficient when recording very dynamic vocalists without having to spend hours finding out issues after the recording has been completed.

The design of the x-over networks optimizes the summing of all three bands, leading to flat frequency response (within +/-0,25 dB) when the gain controls for every band are set on the same stage. The three compressors feature Threshold, Ratio, Attack, Release, and Gain and a show exhibiting gain reduction. Master ranges are set with Output Gain and Balance controls.

Tube-Tech SMC2B

  • All-tube opto-compressor-based multiband compression
  • All-tube opto-compressor-based
  • 3 bands per channel, with variable crossover frequencies
  • Stereo sidechain
  • Master output gain (off to +10dB)
  • Balance control (+/-1,5dB)
  • LED display shows gain reduction
  • Conductive plastic potentiometers
  • Frequency response at -3dB: 5Hz to 60kHz
  • Low noise: < -60dBu at 10dB gain

For EU
Tube-Tech SMC2B
  • Three Compressor bands per channel
  • Variable X-over networks between the bands
  • Adjustable Ratio, Threshold, Attack, Release and Output per band

3. Shadow Hills Industries Mastering Compressor

The Shadow Hills Mastering Compressor has extraordinary performance, and in addition, gives mastering grade compression and limiting for monitoring and mixing. Primarily it’s two compressors in series, per channel, that may act in stereo or dual mono.

First comes our mastering grade electro-optical compressor, adopted by the discrete Class-A compressor/limiter. Each feeds the switchable customized output transformers, Nickel, Iron, and Steel. There’s enough gain in every part to overdrive the most well-liked tape, or clip your converters, in the event you’re into that kind of thing.

The input stage is transformer balanced, adopted by a totally discrete optical compressor. This part utilizes the identical T4B optical attenuator as the LA2A and LA3A, however, is optimized for mastering. The second stage is a discrete Class-A VCA compressor unit. There’s an insertable filter within the side chain to restrict pumping with bass-heavy materials. Lastly, the signal goes by a new Shadow Hills customized transformer-switching network.

The primary position is Nickel, which is a customized model of a well-known L. A. custom console. Next is the Iron. In this mode the signal goes via an op-amp and right into a Class-A output stage then to customized Iron transformers, the final transformer position is Steel. These picks let you select between completely different output transformers which can be in effect: clear, colored, and dirty in a good way.

Shadow Hills Industries Mastering Compressor

  • Dual compression sections for unprecedented dynamic control
  • Switchable output transformers for sonic variety
  • Premium signal path throughout
  • Choose from optical compression, VCA compression, or both in series
  • Optical section provides smooth, program dependent leveling
  • Discrete section gives you the fast, precise sound of a classic VCA compressor
  • Sidechain frequency filter
  • Three selectable output transformers
  • Requires Shadow Hills Power Supply

Shadow Hills Industries Mastering Compressor
  • Number of Channels: Stereo, Dual Mono
  • Ratio:1.2:1 to 20:1
  • Frequency Response:20Hz-20kHz

4. Bettermaker Mastering Compressor

Like all Bettermaker gear, the Mastering Compressor includes a pure analog sign path and full digital recall. An extremely versatile, mastering-grade compressor for recording, mixing, and mastering, the Mastering Compressor could be managed through its onboard 5″ touchscreen and encoders, in addition to its devoted companion plug-in.

It can save all of your settings to the inner memory for immediate recall, and in your DAW project. The unit’s USB info control link (which doesn’t pass audio) helps you to use the Mastering Compressor simply as you’d use a plug-in, complete with full recall and automation.

Designed for important tracking, mixing, and mastering work, the Bettermaker Mastering Compressor delivers analog audio high quality and operational flexibility that’s on par with a number of the most revered compressors available on the market. Add in full digital management through the Bettermaker plug-in, and you’ve got the best of both worlds.

Bettermaker’s strategy seems easy: cherry-pick one of the best classic and modern circuit topologies and mix them in products that supply the sonic integrity of analog with the pace and workflow conveniences of full digital management through the entrance panel and your DAW (with a devoted plug-in). The fact is that not all firms have the design chops to drag it off consistently. Bettermaker does.

Bettermaker Mastering Compressor

  • Pure analog signal path
  • Manual and intelligent release modes
  • Variable mixing between limiting and clipping; clipping section defeat
  • 2 variable color modules may be used simultaneously
  • Both color sections may be internally equalized
  • Touchscreen Metering for control over limiter functions
  • Input, output and reduction metering; VU: full screen, scaled RMS
  • LUFS metering
  • Two points of measurement: Limiter output or plug-in

For EU
Bettermaker Mastering Compressor
  • Dry / wet mix control
  • Dimensions (H x W x D): 19 “x 2 U x 220 mm
  • Weight: 3.9 kg

5. Elysia Alpha Compressor

The alpha compressor provides switchable feedback and feed-forward gain-control circuit paths, low- and highpass sidechain filters, parallel processing, stereo and M/S (Mid/Side) modes, channel linking, good transformer-based coloration, a soft-clipper, and audio path filter, and even extra. Billed as a mastering compressor, the alpha can, after all, even be used as a dual-mono or stereo dynamics processor for tracking or mixing purposes.

Among the many alpha compressor’s boatloads of eminently useable options, is a built-in M/S matrix that allows you to process mid and side signals, opening up utterly new processing choices. You may as well select between feed-forward or feedback compression for every channel individually.

The alpha compressor’s sidechain filter permits you to avoid complicated routings in favor of an efficient workflow. A helpful Signal Matrix lets direct and processed signals be monitored individually or collectively. There’s way more we could go on, however, is enough to say that there are such a lot of cool, really helpful options onboard the alpha compressor, that it’s going to, definitely, turn into your definitive go-to system for dynamics management.

All of the signal processing is dealt with by single transistors in everlasting Class A mode; even the sidechain and power supply use discrete circuits. All parts are of the very best caliber out there and hand-picked for their sonic excellence. Such attention to high quality and element is a normal working procedure for Elysia; they know the outcomes will likely be optimum signal high quality, even at excessive settings.

Elysia Alpha Compressor - best mastering compressors

  • 100% Discrete Class A – all discrete circuitry
  • Integrated M/S Matrix
  • Feed-forward and Feedback type of compression
  • Auto Fast – switchable semi-automation that always provides perfect attack and release
  • Niveau Filter lets you easily form the tonal characteristics
  • Parallel Compression
  • Soft Clip Limiter
  • Switchable Transformers
  • Passive Current Attenuator

For EU
Elysia Alpha Compressor
  • Analog dynamic LED display
  • VOVOX sound conductors
  • Stepped potentiometers

6. Crane Song STC-8 Stereo Compressor/Limiter

The circuitry is all Discrete Class A, with the advantages of second harmonic distortion elements, that are extra-musical than the odd-order harmonics you are inclined to get with Built-in Circuit Op-Amps.

Certainly, the rear of the STC-8 feels hotter than many valve items. There are exterior and inner heatsinks, the latter holding hot discrete transistors. With its meshed top panel, further rack space should be allowed for sufficient airflow above the 2Us that the STC-8 occupies.

The Crane Song is definitely one of the smoothest compressors on the market. You can also make it distorted by utilizing very brief times and winding up the Shape management, nevertheless, it never sounds unpleasant. Though there’s a standard Threshold knob, the Shape knob takes the place of the Ratio. Being a soft-knee design, this unit’s ratio varies relying on the input stage (and release instances). Shape manages the steepness of the compression curve of the signal.

This is akin to ratio control however is a way more intuitive approach to controlling the depth of compression. The ratio usually reaches only 5:1 with 18dB of gain reduction, and the STC-8 appears to work happily and cleanly with such massive quantities of gain reduction. The Output Gain knobs have a 14dB range of make-up gain. In addition, they have a pleasing stepped motion.

The Crane Song is able to very quick, virtually invisible gain management, in addition to clean gradual compression, which can be remarkably clear.

Crane Song STC-8 Stereo Compressor/Limiter

  • Digital & Analog Mastering
  • System Overload Protection
  • Broadcast Engineering
  • Project Studio DAW
  • Simultaneous Compression/Limiting
  • Discrete Class A
  • Balanced/Transformerless I/O
  • Quick & Easy Presets
  • Transparent Overload Protection

For EU
Crane Song STC-8 Stereo Compressor/Limiter
  • Class A audio circuit / no use of VCAs
  • Soft knee characteristic
  • Attack modification (A-Mod)

7. SPL Iron Red

The SPL Iron Mastering Tube Compressor combines the sonic virtues of legendary classic tube compressors with the benefits of the High Dynamic 120V working voltage in a single unit. It’s also excellent for the needs of contemporary mastering studios and units a brand new benchmark when it comes to tube compressor technology, with the modern implementation of a parallel dual-tube circuit.

Due to the specifically conceived Mu-Metal iron transformers, the signal of every channel is broken up across two totally different twin-triode tubes. The mixture of the totally different response curves of both tubes ends in a clear and musically nice compression. Thus, the output signal stays energetic even with an excessive gain reduction. The compression is just noticeable with excessive settings.

The SPL Iron has a real 120-volt working voltage that gives excessive headroom and an ultra-low noise floor. In the event you’re fortunate enough to be mastering well-mixed tracks that are not already pumped as much as a full volume, the Iron compressor is strictly the tool you will want to have to make it loud while sustaining dynamics.

You’ll be able to choose from 4 sidechain EQ modes to tailor how Iron responds to the control signal. It is excellent for stopping a heavy kick drum or bass within the mix from triggering the compressor too much, for instance. The 4 selectable modes are optimized for various kinds of program material, and you can too connect your individual EQ if you happen to prefer to use that to equalize the control signal.

SPL Iron Red

  • Twin-tube design
  • Six rectifier circuits for a wide sonic palette
  • Excellent sonic range and low noise
  • Fine-tune the compression response with sidechain EQ
  • Polish the mix with a sweet passive EQ
  • All controls are switches or detented knobs for easily repeatable results
  • High 120-volt operating voltage
  • Extremely musical, lively sound results
  • 4 built-in sidechain EQ curves

For EU
SPL Iron Red
  • Variable bias tube compressor
  • Parallel dual tube circuit
  • Selection and pairing of the tubes carried out with the Weigl RoeTest

8. Neve 33609 Limiter/Compressor

Right here’s the Neve 33609, a classic compressor that’s been used on numerous great records since the early 70s. It sounds very clean and it stays comparatively clear even when pushed hard. This unit has a compressor part and a limiter part, which makes it excellent for mastering and broadcasting as well. It has stepped controls that permit the person to recall settings when switching between totally different projects. This precision is also invaluable for crucial functions similar to mastering.

This compressor can also be well-known for gluing mixes together, making them sound fuller and richer. Not only is it clear when you want it to be, but it could additionally deal with very advanced materials where different compressors struggle, like pianos and strings. The preset attack time is simply excellent and the machine is definitely able to make something sound better. The build quality is outstanding, as you’d count on from a vastly revered company such as AMS-Neve.

The 33609 features unbiased sidechains for the compressor and limiter sections, with equally unbiased threshold, recovery, and attack controls. The compressor encompasses a choice of ratios from 1.5:1 to 6:1 and a gain make-up management that comes before the limiter. Overall gain discount is indicated on a shifting coil meter.

Very similar to the classic 1073 and 1081 microphone preamplifiers, the 33609 Stereo Compressor is commonly cited as a “desert island” compressor – one which a healthy sampling of the world’s prime engineers and producers would pick above all others.

Neve 33609

  • Meticulously designed according to exacting 1970s specifications
  • Discrete Class-A design provides distortion performance
  • Made with handwired Neve transformers
  • Independently selectable limiter and compressor
  • Brickwall-style limiter with variable recovery times
  • Fast and slow attack options
  • Pre-limiter gain makeup control
  • Versatile compressor with 5 ratio settings

For EU
Neve 33609 Limiter/Compressor
  • Hand-wired Neve transformers
  • Classic 2254 feedback compression
  • Brick wall limiting

9. WesAudio ngBusComp

The build quality is flawless, inside and outside. A black, 3U chassis is adorned with a substantial, brushed‑finish, metallic panel that has many controls, all a pleasing dimension and are generously spaced. The encoders’ knurled knobs have simply enough stiffness to supply helpful tactile feedback and several are contact‑sensitive, their LED indicator rings turning brighter the moment you lay fingers on them.

Every channel’s management panel has eight rotary encoders and three buttons. The Threshold knob does what you’d count on, and on the opposite side of the meter part sits a post-makeup-gain wet/dry mix management. The in/out meter LEDs present increments of 2 or 4 dB, relying on the extent, and the coil meter can point out a gain reduction of up to 20dB. Beneath the meter, two buttons increment the Ratio between 5 settings, each with standing LED: 1.5, 2, 4, 10, and INF:1, the final being hard limiting.

A side‑chain filter might be set to Off, 60, 90, or 150 Hz, or T1 or T2, the last two combining tilt EQs with high‑pass filters. That’s loads of scope for fantastic‑tuning the compressor’s response, but should you want extra, the final position engages the exterior side chain.

The ngBusComp’s stand‑out function is that it may be managed by a plug‑in: it can save you and recall settings along with your initiatives and even use automation. And the execution is great, it’s simply the very best, slickest integration of plug‑in and analog hardware that’s out there Whether or not you control the plug‑in from a mouse, or touchscreen or use automation, it simply will get on with the job with a minimum of fuss.

WesAudio ngBusComp

  • 100% analog device with +24dBu of headroom
  • Full digital control, automation, and recall via companion plug-in
  • Relative stereo channel linking
  • Mid-side operation allows for different side and mid settings
  • Selectable output stages: normal (electronically balanced), IRON (Carnhill transformer balanced)
  • Detailed metering for both channels
  • Per-channel external side chain filter access via TRS rear connector
  • A/B/C compare feature

For EU
WesAudio ngBusComp
  • Stereo / dual mono can be used
  • Headroom + 26dBu
  • Quad VCA THAT 2181
  • M / S mode switchable


Even though we are not experts in the mastering process, we know a little bit, just enough to make this suggestion. If you check various mastering studios, probably you will be able to find any of these units that we mentioned above – and for a good reason – they are the ultimate choice when it comes to applying compression in the mastering phase.

In case you are having any questions in regards to our topic, please let us know in the comment section below and we will be more than happy to answer you!

If you want to check our selection of mastering equalizers, you can do it here!


Nikoloski is the founder and main content writer and editor of Mixing Tips. With his experience in audio engineering, mixing, and mastering for over 15 years, will provide hands-on experience and expertise in all the matters covered on this website.

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