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I like using iTunes' equalizer, but that only works in iTunes.

I'm looking for some software that lets me apply a global, system-wide equalizer to Mac OS X.
The app (or pref pane, etc.) would let me change EQ settings and have that apply to all apps (iTunes, Spotify, Chrome, etc.).

Ideally the software would have some nice presets like iTunes does.

Free preferred, but I'm certainly willing to consider buying something.

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I'm curious, is there any particular reason why you want this? Are you looking to record or is it just for output? And are you looking to do this for certain applications, or all audio across the system? – Kyle Cronin Oct 7 '11 at 23:27
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@KyleCronin I'm using Spotify more than iTunes, and it doesn't have any kind of equalizer functionality. I also sometimes use things like Google Music (in-browser). Basically, I'd like to be able to apply an equalizer to apps that don't have one built in. And no, I'm not planning on recording; this is strictly for output/listening needs. Updated the question to address your last question (system wide, ideally). – Nathan Greenstein Oct 7 '11 at 23:35
up vote 8 down vote accepted

Check out Boom, it's quite awesome.

Boom boosts the volume of your Mac at all levels. From boosting the volume of your music on iTunes, it boom the YouTube videos playing on your web browser. You can now boost the volume of any application playing sound or video like QuickTime, Podcasts, Skype, iChat, DVD Player, Garageband, iMovie and so on.

enter image description here

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Awesome app! I don't usually need the volume boost, but the equalizer is awesome! – Nathan Greenstein Oct 8 '11 at 0:14
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Now, we still need an answer for a free alternative... :-) – gentmatt Nov 22 '11 at 16:26
    
Holiday Special in the Mac App store: 50% of till 2nd January! – gentmatt Dec 16 '11 at 17:07
    
I tried Boom and found out that it distorts the sound if you use an external DAC along with your Mac. Known issue for a fairly long time - globaldelight.com/support/discussion/3169/… I can confirm that Hear (from Prosoft) does not suffer from this issue – andy318 May 23 at 16:58

enter image description here

I didn't want to pay to have an equalizer so I developed my own one and giving it away for free! Click here to download eqMac! The app is signed by Apple and works for OSX 10.9 and higher!

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That's rad. love the minimalist interface and how it lives up there in the menu bar. Almost looks like part of the OS. – tjt263 Sep 2 '15 at 23:56
    
How did you develop this? Was it difficult? I would love to give it a go. – tjt263 Sep 2 '15 at 23:56
1  
@tjt263 well I've spent around a month on development :) I will be releasing the source code soon, I need some help from the community! – RootK Sep 3 '15 at 8:25
    
this is awesome! Thank you so much for this. – RoelF Sep 4 '15 at 8:59
    
@RootK Feel free to contact me via chat. Maybe I can help. – tjt263 Sep 4 '15 at 15:55

There's a free method using Soundflower and an Apple Developer Application called AU Lab (you'll need a free Apple Developer account get it, search for "AU Lab" after login).

Basically:

  1. Install both programs
  2. Change your audio output to Soundflower in System Preferences
  3. Open AU Lab and pipe the Soundflower signal to your audio out.
  4. Apply an AUGraphicEQ filter in AU Lab
  5. Fiddle with levels to your heart's content.

This solution was taken from a blog post at dctrwatson.com/2011/06/os-x-system-equalizer, which I cannot link to due to insufficient reputation points. That page also contains better instructions and a startlingly informative comment thread.

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There is also Hear. It has an equalizer as well as bass boosting.

Hear greatly improves audio quality in movies and music throughout all of your Mac OS X applications. With Hear, music is richer, movie sound and dialog is clearer and games will blow you out of your chair!

Try the 30 day demo for Free: https://www.prosofteng.com/hear/heardemo/

Hear
Hear

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The link is dead. – jm_____ Aug 30 '15 at 20:59
    
@jm_____, As of today, anyway, the original link is not dead and jbell added a link to the free 30 day trial version. – user3439894 Dec 1 '15 at 21:11
    
Hear ruined my macs audio system even after removing it i can't fix the issues. – Matthew Mar 14 at 20:31

I use AirFoil, lets me take advantage of AirPlay, and the EQ works for all sound output.

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