Your questions answered: Sonarworks Reference calibration tools

If getting your headphones and studio monitors calibrated sounds like a good New Years’ Resolution, we’ve got you covered. Some good questions came up in our last story on Sonarworks Reference, the automated calibration tool, so we’ve gotten answers for you.

First, if you’re just joining us, Sonarworks Reference is a tool for automatically calibrating your studio listening environment and headphones so that the sound you hear is as uncolored as possible – more consistent with the source material. Here’s our previous write-up, produced in cooperation with Sonarworks:

What it’s like calibrating headphones and monitors with Sonarworks tools

CDM is partnering with Sonarworks to help users better understand how to use the tool to their benefit. And so that means in part answering some questions with Sonarworks engineers. If you’re interested in the product, there’s also a special bundle discount on now: you get the True-Fi mobile app for calibration on your mobile device, free with a Sonarworks Studio Edition purchase (usually US$79):

Readers have been sending in questions, so I’ll answer as many as I can as accurately as possible.

Does it work?

Oh yeah, this one is easy. I found it instantly easier to mix both on headphones and sitting in the studio, in that you hear far more consistency from one listening environment / device to another, and in that you get a clearer sense of the mix. It feels a little bit like how I feel when I clean my eyeglasses. You’re removing stuff that’s in the way. That’s my own personal experience, anyway; I linked some full reviews and comparisons with other products in the original story. But my sense in general is that automated calibration has become a fact of life for production and live situations. It doesn’t eliminate the role of human experts, not by a long shot – but then color calibration in graphics didn’t get rid of the need for designers and people who know how to operate the printing press, either. It’s just a tool.

Does it work when outside of the sweet spot in the studio?

This is a harder question, actually, but anecdotally, yeah, I still left it on. You’re calibrating for the sweet spot in your studio, so from a calibration perspective, yeah, you do want to sit in that location when monitoring – just as you always would. But a lot of what Sonarworks Reference is doing is about frequency response as much as space, I found it was still useful to leave the calibration on even when wandering around my studio space. It’s not as though the calibration suddenly stops working when you move around. You only notice the calibration stops working if you have the wrong calibration profile selected or you make the mistake of bouncing audio with it left on (oops). But that’s of course exactly what you’d expect to happen.

What about Linux support?

Linux is officially unsupported, but you can easily calibrate on Windows (or Mac) and then use the calibration profile on Linux. It’s a 64-bit Linux-native VST, in beta form.

If you run the plug-in the handy plug-in host Carla, you can calibrate any source you like (via JACK). So this is really great – it means you can have calibrated results while working with SuperCollider or Bitwig Studio on Linux, for example.

This is beta only so I’m really keen to hear results. Do let us know, as I suspect if a bunch of CDM readers start trying the Linux build, there will be added incentive for Sonarworks to expand Linux support. And we have seen some commercial vendors from the Mac/Windows side (Pianoteq, Bitwig, Renoise, etc.) start to toy with support of this OS.

If you want to try this out, go check the Facebook group:

(Direct compiled VST download link is available here, though that may change later.)

What’s up with latency?

You get a choice of either more accuracy and higher latency, or lower accuracy and lower latency. So if you need real-time responsiveness, you can prioritize low latency performance – and in that mode, you basically won’t notice the plug-in is on at all in my experience. Or if you aren’t working live / tracking live, and don’t mind adding latency, you can prioritize accuracy.

Sonarworks clarifies for us:

Reference 4 line-up has two different *filter* modes – zero latency and linear phase. Zero latency filter adds, like the name states, zero latency, whereas linear phase mode really depends on sample-rate but typically adds about 20ms of latency. These numbers hold true in plugin form. Systemwide, however, has the variable of driver introduced latency which is set on top of the filter latency (zero for Zero latency and approx 20ms for linear phase mode) so the numbers for actual Systemwide latency can vary depending on CPU load, hardware specs etc. Sometimes on MacOS, latency can get up to very high numbers which we are investigating at the moment.

What about loudness? Will this work in post production, for instance?

Some of you are obviously concerned about loudness as you work on projects where that’s important. Here’s an explanation from Sonarworks:

So what we do in terms of loudness as a dynamic range character is – nothing. What we do apply is overall volume reduction to account for the highest peak in correction to avoid potential clipping of output signal. This being said, you can turn the feature off and have full 0dBFS volume coming out of our software, controlled by either physical or virtual volume control.

Which headphones are supported?

There’s a big range of headphones with calibration profiles included with Sonarworks Reference. Right now, I’ve got that folder open, and here’s what you get at the moment:


AKG K72, K77, K121, K141 MKII, K240, K240 MKII, K271 MKII, K550 MKII, K553 Pro, K612 Pro, K701, K702, K712 Pro, K812, Q701

Apple AirPods

Audeze KCD-2, LCD-X

Audio-Technica ATH-M20x, M30x, M40x, M50x, M70x, MSR7, R70x

Beats EP, Mixr, Pro, Solo2, Solo3 wireless, Studio (2nd generation), X Average

Beyerdynamic Custom One Pro, DT 150, DT 250 80 Ohm, DT 770 Pro (80 Ohm, 32 Ohm PPRO, 80 Ohm Pro, 250 Ohm Pro), DT 990 Pro 250 Ohm, DT 1770 Pro, DT 1990 Pro (analytical + balanced), T 1

Blue Lola, Mo-Fi (o/On+)

Bose QuietComfort 25, 35, 35 II, SoundLink II

Bowers & Wilkins P7 Wireless

Extreme Isolation EX-25, EX-29

Focal Clear Professional, Clear, Listen Professional, Spirit Professional

Fostex TH900 mk2, TX-X00

Grado SR60e, SR80e

HiFiMan HE400i

HyperX Cloud II

JBL Everest Elite 700

Koss Porta Pro Classic

KRK KNS 6400, 8400

Marshall Major II, Monitor

Master & Dynamic MH40

Meze 99, 99 NEO

Oppo PM-3

Philips Fidelio X2HR, SHP9500

Phonen SMB-02

Pioneer HDJ-500

Plantronics BackBeat Pro 2

PreSonus HD 7

Samson SR850

Sennheiser HD, HD 25 (&0 Ohm, Light), HD-25-C II, HD 201, HD 202, HD 205, HD 206, HD 215-II, HD 280 Pro (incl. new facelift version), HD 380 Pro, HD 518, HD 598, HD 598 C, HD 600, HD 650, HD 660 , HD 700, HD 800, HD 800 S, Moometum On-Ear Wireless, PX 100-II

Shure SE215, SRH440, SRH840, SRH940, SRH1440, SRH1540, SRH1840

Skullcandy Crusher (with and without battery), Hesh 2.0

Sony MDR-1A, MDR-1000X, MDR-7506, MDR-7520, MDR-CD900ST, MDR-V150, MDR-XB450, MDR-XB450AP, MDR-XB650BT, MDR-XB950AP, BDR-XB950BT, MDR-Z7, MDR-XZ110, MDR-ZX110AP, MDR-ZX310, MR-XZ310AP, MDR-ZX770BN, WH-1000MX2

Status Audio CB-1

Superlux HD 668B, HD-330, HD681

Ultrasone Pro 580i, 780i, Signature Studio

V-Moda Crossfade II, M-100

Yamaha HPH-MT5, HPH-MT7, HPH-MT8, HPH-MT220

So there you have it – lots of favorites, and lots of … well, actually, some truly horrible consumer headphones in the mix, too. But I not lots of serious mixers like testing a mix on consumer cans. The advantage of doing that with calibration is presumably that you get to hear the limitations of different headphones, but at the same time, you still hear the reference version of the mix – not the one exaggerated by those particular headphones. That way, you get greater benefit from those additional tests. And you can make better use of random headphones you have around, clearly, even if they’re … well, fairly awful, they can be now still usable.

Even after that long list, I’m sure there’s some stuff you want that’s missing. Sonarworks doesn’t yet support in-ear headphones for its calibration tools, so you can rule that out. For everything else, you can either request support or if you want to get really serious, opt for individual mail-in calibration in Latvia.


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What it’s like calibrating headphones and monitors with Sonarworks tools

No studio monitors or headphones are entirely flat. Sonarworks Reference calibrate any studio monitors or headphones with any source. Here’s an explanation of how that works and what the results are like – even if you’re not someone who’s considered calibration before.

CDM is partnering with Sonarworks to bring some content on listening with artist features this month, and I wanted to explore specifically what calibration might mean for the independent producer working at home, in studios, and on the go.

That means this isn’t a review and isn’t independent, but I would prefer to leave that to someone with more engineering background anyway. Sam Inglis wrote one at the start of this year for Sound on Sound of the latest version; Adam Kagan reviewed version 3 for Tape Op. (Pro Tools Expert also compared IK Multimedia’s ARC and chose Sonarworks for its UI and systemwide monitoring tools.)

With that out of the way, let’s actually explain what this is for people who might not be familiar with calibration software.

In a way, it’s funny that calibration isn’t part of most music and sound discussions. People working with photos and video and print all expect to calibrate color. Without calibration, no listening environment is really truly neutral and flat. You can adjust a studio to reduce how much it impacts the sound, and you can choose reasonably neutral headphones and studio monitors. But those elements nonetheless color the sound.

I came across Sonarworks Reference partly because a bunch of the engineers and producers I know were already using it – even my mastering engineer.

But as I introduced it to first-time calibration product users, I found they had a lot of questions.

How does calibration work?

First, let’s understand what calibration is. Even studio headphones will color sound – emphasizing certain frequencies, de-emphasizing others. That’s with the sound source right next to your head. Put studio headphones in a room – even a relatively well-treated studio – and you combine the coloration of the speakers themselves as well as reflections and character of the environment around them.

The idea of calibration is to process the sound to cancel out those modifications. Headphones can use existing calibration data. For studio speakers, you take some measurements. You play a known test signal and record it inside the listening environment, then compare the recording to the original and compensate.

Hold up this mic, measure some whooping sounds, and you’re done calibration. No expertise needed.

What can I calibrate?

One of the things that sets Sonarworks Reference apart is that it’s flexible enough to deal with both headphones and studio monitors, and works both as a plug-in and a convenient universal driver.

The Systemwide driver works on Mac and Windows with the final output. That means you can listen everywhere – I’ve listened to SoundCloud audio through Systemwide, for instance, which has been useful for checking how the streaming versions of my mixes sound. This driver works seamlessly with Mac and Windows, supporting Core Audio on the Mac and the latest WASAPI Windows support, which is these days perfectly useful and reliable on my Windows 10 machine. (There’s unfortunately no Linux support, though maybe some enterprising user could get that Windows VST working.)

On the Mac, you select the calibrated output via a pop-up on the menu bar. On Windows, you switch to it just like you would any other audio interface. Once selected, everything you listen to in iTunes, Rekordbox, your Web browser, and anywhere else will be calibrated.

That works for everyday listening, but in production you often want your DAW to control the audio output. (Choosing the plug-in is essential on Windows for use with ASIO; Systemwide doesn’t yet support ASIO though Sonarworks says that’s coming.) In this case, you just add a plug-in to the master bus and the output will be calibrated. You just have to remember to switch it off when you bounce or export audio, since that output is calibrated for your setup, not anyone else’s.

Three pieces of software and a microphone. Sonarworks is a measurement tool, a plug-in and systemwide tool for outputting calibrated sound from any source, and a microphone for measuring.

Do I need a special microphone?

If you’re just calibrating your headphones, you don’t need to do any measurement. But for any other monitoring environment, you’ll need to take a few minutes to record a profile. And so you need a microphone for the job.

Calibrating your headphones is as simple as choosing the make and model number for most popular models.

Part of the convenience of the Sonarworks package is that it includes a ready-to-use measurement mic, and the software is already pre-configured to work with the calibration. These mics are omnidirectional – since the whole point is to pick up a complete image of the sound. And they’re meant to be especially neutral.

Sonarworks’ software is pre-calibrated for use with their included microphone.

Any microphone whose vendor provides a calibration profile – available in standard text form – can also use the software in a fully calibrated mode. If you have some cheap musician-friendly omni mic, though, those makers usually don’t do anything of the sort in the way a calibration mic maker would.

I think it’s easier to just use these mics, but I don’t have a big mic cabinet. Production Expert did a test of generic omni mics – mics that aren’t specifically for calibration – and got results that approximate the results of the test mic. In short, they’re good enough if you want to try this out, though Production Expert were being pretty specific with which omni mics they tested, and then you don’t get the same level of integration with the calibration software.

Once you’ve got the mics, you can test different environments – so your untreated home studio and a treated studio, for instance. And you wind up with what might be a useful mic in other situations – I’ve been playing with mine to sample reverb environments, like playing and re-recording sound in a tile bathroom, for instance.

What’s the calibration process like?

Let’s actually walk through what happens.

With headphones, this job is easy. You select your pair of headphones – all the major models are covered – and then you’re done. So when I switch from my Sony to my Beyerdynamic, for instance, I can smooth out some of the irregularities of each of those. That’s made it easier to mix on the road.

For monitors, you run the Reference 4 Measure tool. Beginners I showed the software got slightly discouraged when they saw the measurement would take 20 minutes but – relax. It’s weirdly kind of fun and actually once you’ve done it once, it’ll probably take you half that to do it again.

The whole thing feels a bit like a Nintendo Wii game. You start by making a longer measurement at the point where your head would normally be sitting. Then you move around to different targets as the software makes whooping sounds through the speakers. Once you’ve covered the full area, you will have dotted a screen with measurements. Then you’ve got a customized measurement for your studio.

Here’s what it looks like in pictures:

Simulate your head! The Measure tool walks you through exactly how to do this with friendly illustrations. It’s easier than putting together IKEA furniture.

You’ll also measure the speakers themselves.

Eventually, you measure the main listening spot in your studio. (And you can see why this might be helpful in studio setup, too.)

Next, you move the mic to each measurement location. There’s interactive visual feedback showing you as you get it in the right position.

Hold the mic steady, and listen as a whooping sound comes out of your speakers and each measurement is completed.

You’ll make your way through a series of these measurements until you’ve dotted the whole screen – a bit like the fingerprint calibration on smartphones.

Oh yeah, so my studio monitors aren’t so flat. When you’re done, you’ll see a curve that shows you the irregularities introduced by both your monitors and your room.

Now you’re ready to listen to a cleaner, clearer, more neutral sound – switch your new calibration on, and if all goes to plan, you’ll get much more neutral sound for listening!

There are other useful features packed into the software, like the ability to apply the curve used by the motion picture industry. (I loved this one – it was like, oh, yeah, that sound!)

It’s also worth noting that Sonarworks have created different calibration types made for real-time usage (great for tracking and improv) and accuracy (great for mixing).

Is all of this useful?

Okay, disclosure statement is at the top, but … my reaction was genuinely holy s***. I thought there would be some subtle impact on the sound. This was more like the feeling – well, as an eyeglass wearer, when my glasses are filthy and I clean them and I can actually see again. Suddenly details of the mix were audible again, and moving between different headphones and listening environments was no longer jarring – like that.

Double blind A/B tests are really important when evaluating the accuracy of these things, but I can at least say, this was a big impact, not a small one. (That is, you’d want to do double blind tests when tasting wine, but this was still more like the difference between wine and beer.)

How you might actually use this: once they adapt to the calibrated results, most people leave the calibrated version on and work from a more neutral environment. Cheap monitors and headphones work a little more like expensive ones; expensive ones work more as intended.

There are other uses cases, too, however. Previously I didn’t feel comfortable taking mixes and working on them on the road, because the headphone results were just too different from the studio ones. With calibration, it’s far easier to move back and forth. (And you can always double-check with the calibration switched off, of course.)

The other advantage of Sonarworks’ software is that it does give you so much feedback as you measure from different locations, and that it produces detailed reports. This means if you’re making some changes to a studio setup and moving things around, it’s valuable not just in adapting to the results but giving you some measurements as you work. (It’s not a measurement suite per se, but you can make it double as one.)

Calibrated listening is very likely the future even for consumers. As computation has gotten cheaper, and as software analysis has gotten smarter, it makes sense that these sort of calibration routines will be applied to giving consumers more reliable sound and in adapting to immersive and 3D listening. For now, they’re great for us as creative people, and it’s nice for us to have them in our working process and not only in the hands of other engineers.

If you’ve got any questions about how this process works as an end user, or other questions for the developers, let us know.

And if you’ve found uses for calibration, we’d love to hear from you.

Sonarworks Reference is available with a free trial:

And some more resources:

Erica Synths our friends on this tool:

Plus you can MIDI map the whole thing to make this easier:

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Sonarworks updates Reference 4 with 60 new headphone profiles and increased DAW support

Sonarworks Reference 4 SR

Sonarworks has announced a significant update to its best-in-class Reference 4 software. Key updates in in the 4.1.6 version include a 32-bit plugin in addition to the existing 64-bit one, enabling users with older DAW platforms to take advantage of Reference’s robust measurement and calibration capabilities. Additionally, users are now able to download the latest […]

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Sonarworks SR studio reference sound standard for speakers and headphones

Sonarworks Reference 4 SRSonarworks has announced Sonarworks SR, a new digital sound standard that is to be included with the latest update of the Reference 4 sound calibration software launching in early June. The standardization technology promises to resolve the age-old industry problem of disparate sonic reference points for audio professionals, delivering the same accurate studio reference sound […]

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Sonarworks has released their newest speaker calibration software for sound studios and home recording, Sonarworks Reference 3. Reference 3 is designed to let anyone to do the complete studio calibration process, with a visual step-by-step workflow, in less than 15 … Continue reading

Sonarworks intros Reference 3 studio calibration software

Sonarworks has launched Reference 3, a studio calibration software for Windows and Mac. After 3 years and 1M USD spent on development, Sonarworks has just released their newest speaker calibration software for sound studio professionals … read more

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