What is Haas Effect? Important Do’s and Don’ts and Side-Effects! (2023)

What is Haas Effect?


To sway away from the regular tips and methods we share on our website, we are going to talk about a psychoacoustic effect and phenomenon in which our brain percepts the audio.

Discovered by Dr. Helmut Haas, this effect perceives the sound that comes to our ears a single millisecond later than the direct sound – creating the effect. Also, another reflection that arrives in the time frame from 5 to 35 milliseconds can be louder by 10dB than the original sound – and it won’t be perceived as a secondary audio signal or echo.

What is Haas Effect?

The Haas effect describes the next phenomenon: if an individual hears two sounds with a delay of fewer than 40 milliseconds (under the human echo threshold), then that individual perceives them each as a single sound. That is associated with how we, as listeners, decide the spatial position of a speaker by sound (merely put: the place we predict the sound is coming from).

Since two sounds with a really brief delay are perceived as one sound, the spatial spot is set by the primary and dominant sound. That is fully unbiased of the place the second sound comes from. In different words: we find the supply of a sound by what reaches our ears first.

Every little thing that follows, conveys a way of depth and spaciousness, however, we don’t understand it as an individual sound. So, with a delay of 35 milliseconds, you’ll be able to broaden the stereo picture of an in any other case ‘flat’ mono track and add dimension, totally without utilizing reverb or an imaging plug-in. By utilizing the Haas effect, you create a wider stereo picture.

The impact is appropriate for a wider mix with extra depth on theatre levels, in bars, or simply any place where there’s a stationary audience. By the way, you’ll be able to read the Haas effect the other way up: longer delays between sounds create distinct repetitions and a larger sense of directionality.

What is Haas Effect

Creating the Haas Effect

To create Haas Effect whereas mixing music, comply with the steps listed below:

  • Duplicate a Mono Channel to a brand new channel.
  • Hardpan one of the tracks to the left and the other one to the right side.
  • Delay one of the channels by 10-50ms.
  • Listen to the width and style. Make delay adjustments accordingly.
  • Delays lower than 10ms will create a phasing effect which could sound odd on lengthy sustaining sounds but can be utilized on quick sustaining sounds.

Using Haas Effect in Mixing

There are a large number of ways to make use of the Haas effect in your mixes that will help you get distinctive outcomes. The Haas effect may also help you remove directional masking in your mixes, enhance the general stereo image, and thicken up your mix transients with early reflections in your reverb plugin.

Haas effect is best suited to the next sound varieties:

  • Guitar Sounds
  • Synth Sounds – no matter the style of synth.
  • Pads – An extended delay of around 40-50ms gives more space.
  • Snares and Claps/Percussions

In-Depth Audio Mixing with the Haas Effect

To benefit from the Haas effect whereas mixing, you most likely have seen that very brief, delayed sounds can create a way of spaciousness, whereas longer delayed sounds present distinct repeats and a higher sense of directionality.

Generally, in an audio mix, the sense of directionality is supplied by panning sound sources and it’s achieved by varying the quantity going into every channel (usually the main left and right channels of a stereo mix). Utilizing delays, nevertheless, controls the timing of every channel. As people, we depend on each depth and timing to understand sound, so capitalizing on the Haas effect can yield some fascinating outcomes.

To create a wider stereo sound, which lends itself to a broader mix with extra depth, one methodology is to duplicate a mono track and pan each of them hard left and hard right. Then, by including a brief delay to one of the tracks, the outcome might be that the 2 mono tracks played collectively will sound wider than they really are.

The exact delay time may be very depending on the precise content of the track, so some experimenting is critical to yield a great outcome. In other words, you need to have fun and find the sweet spot to improve your mix.

As a general guideline, a delay of around 5 ms on one track will successfully improve directionality and generate an ‘out-of-phase’ sort of sound. For example, by delaying the left-panned channel by 5 ms, the sound will seem extra intense within the right-panned channel.

Past 10 ms of delay, the 2 mono tracks will sound wider, fairly than kind of intense in a single channel. In all instances, the fundamental rule is to maintain the delay time below our ears’ echo threshold (roughly 35 to 40 ms), in order that no distinct repeats, or echoes, become audible.

Haas Effect Plugin
Haas Effect Plugin

Side effects of the Haas Effect

As you study the Haas effect (and stereo mixing usually), you’ll rapidly run into two concepts; it’s good to pay close consideration to phase cancellation and mono compatibility. Let’s shortly go over them and see how they relate to the Haas effect.

Phase cancellation happens when adding two or extra sounds whose waveforms are inverted, inflicting a discount in volume. You possibly can see that when 2 waveforms are completely in phase, their amplitude will merely add up, leading to elevated volume.

Nonetheless, as they go out of phase, the “highs” of the primary waveform can be canceled by the “lows” of the second, lowering the general quantity and creating undesirable artifacts.

Mono compatibility however is the method of checking that your track still sounds good in mono. Why does mono matter? As artists and audio engineers, we prefer to think that everybody will listen to our tunes on high-quality headphones or audio systems. However, you’ll be shocked at how many individuals still play music from their iPhone or a small Bluetooth speaker.

This leads us to the conclusion that mono compatibility should be in focus when finishing our songs. You need to be sure that your music nonetheless sounds good when the stereo data is collapsed to mono, i.e. when the left and right channels turn out to be equivalent.

Mono Compatibility and Phase Cancellation
Mono Compatibility and Phase Cancellation


Familiarizing yourself with Precedence and Haas psychoacoustic effects lets you experiment with progressive new mixing strategies. The next time you find yourself within the studio and begin producing a brand new hit you’ll absolutely pay extra attention and use the Haas effect to take tones and melodies in several instructions, dimensions, or extra intense and deep stretches.

In case you are having any questions in regards to the topic we covered here in this article, please let us know in the comment section below and we will be more than happy to help you out and provide some answers. Until next time!


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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