The Importance of Space in a Mix: Part III

Welcome to the third and final article about space in a mix. If you haven’t already read them first, check out:

Part 1: The Concept of Space in a Mix

Part 2 : Tools for Mixing the Space

Mixing Space

So you’ve recorded all your instruments and room captures, you’ve got a basic mix going, and you’ve selected your delays and reverbs. Now what? As discussed in the prior articles we are either looking for a sense of coherence, or a surreal space that has some kind of orchestration to it. Our sonic elements for working toward our goal are the same as any other set of sounds: tone, texture, rhythm, and spatial cues.

I’m not normally a mix-by-numbers sort of person, and there’s certainly no one way of working ambiance into your mix. However, I am going to share some of my thoughts and techniques which you can lift or use to platform your own techniques.

First, find your real spaces and focus on those. Room captures in particular can serve two very useful functions in a mix. First: they add actual living breathing space — something no other reverb can really do.

Second, the room captures expose the sound of the space that the close captures possess at a much subtler level. In other words, the room captures put a magnifying glass on the sound of the space that is in the close miking on any given instrument. This makes the room captures a good place to start.

Also, if you tracked in multiple rooms, getting a sense of consistency here is of the utmost important. All the artificial reverbs can be tweaked to fit the sound of the real room(s), but the real rooms can’t be tweaked to match the artificial reverbs except to a minimal degree.

Working the Real Room

Rhythm: If it’s late, use a gate. Expansive rooms yield long reverb tails, and those can throw off the rhythmic sense of a song. Fast songs and long tails are generally a rough combination. If it feels like the room decay is just hanging around too long, a gate can be just the thing to shorten it up. Just remember that hard gating a reverb sounds unnatural, so a gradual gain reduction will be much more transparent. Conversely, if the room sound is too short, a compressor can bring up the tail and give the impression that the reverb is decaying slower. This is also a good trick to use if you want to create the sonic image of a large room when a large room is not at your disposal. It helps a great deal to make this decision at the tracking stage, because the digital world is a cruel place for the end of a reverb tail.

Tone: In some genres, room sound is very much desirable. Often in Jazz, Indie Rock, and Classical styles you’ll want a specific and flattering room sound. For other genres like Pop, Rock, Hip Hop, and Dance, a natural room sound can be undesirable  A room will have response up and down the frequency range, but there will be specific areas of tonal signatures. These are the areas of sonic build up that re-emphasize the content of what’s being played in the room. You’re going to find these in the mid-range — and depending on the style, you either want to really emphasize these areas, or completely cut them out.

Texture: Specifically how the room reacts to transients and how diffuse the room is. Outside of some mild compression, there’s not much one can do about the texture of a room. Basically the best thing to do is to acknowledge the textural cues of the room sound, and note them for later when building the rest of the mix.

Isolation Room Verb

Some mixes call for exceptionally dry sounds. Dry sounds can come off as stale, or dead in the water. Even for things that are recorded in super dead isolation rooms, there is still a sound to the space. It’s just super subtle. Careful compression on the dry source can help the air around the source come up and create depth even where there is very little reverberation. Start with very long attack times and very short release times and work your way to the point where the air develops, but the naturalness of the source is not overly compromised.

Working the Artificial Space

Pick your reverbs and delays so they best compliment the sources they are effecting. This is of course highly subjective, but contrast can be nice. For example:

  • Bright reverbs on dark sources.
  • Dark reverbs on bright sources.
  • Open and smooth reverbs on dense, harder sounds like snare drums
  • Dense, coarse reverbs on smoother sounds like clean guitars.

One of the beautiful psychological effects of reverb is that it can provide tonal content for a source that otherwise doesn’t have it. A good way to get high end into a vocal that seems dark is to use a bright reverb.

Soloing Reverb

Once your reverbs are picked, try soloing just the reverb returns. No dry sounds at all.

Try to texturally, tonally and rhythmically match the reverbs and room sounds using the algorithm settings, EQ, volume and dynamic processing. Or, do the opposite: see if you can make the reverbs sound as different as possible for a surreal sense of space.

It may also help to remove any resonances that are showing up in the room sounds. Natural rooms tend to have rings or resonances. In most mixes, it’s a good idea to get rid of these to open things up. But sometimes, those very resonances are what sound good. Guitar amps sound really cool in tight stone rooms because of the way the room resonates with itself.

Blending Delays

Delays have always been a difficult element for my own mixing. I found that delays almost always cluttered the mix and distracted from whatever source fed them. I brought this up on Gearslutz and the consensus seemed to validate my feeling: you can really go to town on delays.

One trick for this is to feed the delay through one of the reverb processors. Then it’s the usual suspects: EQ and compression. This will help the delay feel like it exists in the context of the space.

Hard filtering will also help delays work through the mix. One need not be squeamish about cutting large portions of the sound out. Likewise, many people recommended using distortion and other effects on delays to give them more texture and a more “musical” function in the mix. Mono delay can be great for adding depth, but changing the timing on the sides of the delay signal can add some nice width to the effect as well.

Bringing In The Dry Sounds

Once you have made it this far, bring in a few of the dry sources — the ones that have a little room sound in the capture, like drum overheads. Listen to how the sense of space blends together now. A little surgical processing may help gel things together, but be careful not to compromise the dry sound. If you can’t get the space around the dry sounds to gel well with the room sounds, try feeding it through one of your artificial verbs.


The most important idea here is to determine what is important for the effect of the song, and the aesthetic surrounding the genre. Indie Rock loves some good reverb, so you want to be able to play up the room sounds without clogging the mix and really blend artificial verb tightly in with natural room sounds.

Hip-Hop wants things up front and in your face. This means you need some elements with air and space around them, but only the subtlest amount, and probably a few elements that sound very far away to create the contrast. It all ends where it starts: with what you want to achieve for the song.

The subject of ambience is unending. If there’s information I haven’t covered, or that could be expanded on further, I encourage you to continue the discussion in the comments below!

Matthew Weiss

Matthew Weiss

Matthew Weiss engineers from his private facility in Philadelphia, PA. Credits include Snoop Dogg, Gorilla Zoe, Arrested Development, Dizzee Rascal, Gift of Gab, J-Son and many others. Get in touch at
  • Hakim Callier


    Nice series. I’ve found my approach to this changing overtime. Sometimes its a combination of reverb and delays others just multiple delays or a blend of reverbs. I think just as getting the sounds of instruments right takes some experimentation, so does get the room tones and early reflections. Its all about experimentation… at first. But once you get a sound you like… you gotta get it right.

    Good stuff… thanks.


    • Matt


      I agree completely – I’ve spent years developing my approach to ambience, and it still changes. Every now and then I’ll stumble upon something really cool, but it’s just a sea of endless possibilities.

  • Jan

    Really cool article to read Matt – I think getting the rooms in a recording to work together adds a MASSIVE boost to how natural the dynamics of a track can sound. Even if the dynamics are artificial the right verb work can make a mix come alive like nothing else. Cheers for putting the time into this.

    • Matt

      Thanks Jan. The right ambience, when it all works together just adds a life to the mix that nothing else replaces.

  • Tyler

    Fantastic article, thank-you! The sustain volume on a transient designer plug (e.g. SPL Transient Designer) gives you a very quick/easy way to bring out or reduce the captured reverb on a track.

    • Matt

      SPL Mo-Verb is a cool one too. I’ve been experimenting with De-Verb and Mo-Verb a bit.

  • Meow

    thank you for the series, very informative and insightful!


    • Matt

      you’re welcome!


  • ErikKoodle

    Cool post! I have a few question. Mixing the ambience first seems like a very effective way to help make a song more cohesive. Is it worth while to experiment with sending a signal into a real room and capturing the ambience? How would I go about mixing this into the dry signal? Do you literally bring up the ambience of every instrument before mixing in any dry tracks?

    you da man

  • Octo

    Just read a few of your articles and bookmarking your site. Really nice stuff man. you articulate this stuff very well and seem to know your stuff well, so props to you!

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  • Jay Jay Matalos Svm

    WOw Mathew, Your Page Is Awesome , Very Helpffull, And Very humble of your part to share that help, im actuallly a Producer, Perhaps Recording & Mixing, Of several Urban Music Style , with maybe 10 years of hard job, but nobody finish to learn ever. excuse my writening, english isn’t my native language. Regards From Colombia!! I wanna Share My Music, Bless!

  • StillUnderground Ep

    Hey Matt,

    Fantastic series of articles!
    Is there a way I could PM you?