# Spatializer Bug with Volume: Fmod Studio 2.01.01 **URL:** \ **Category:** FMOD Studio\ **Created:** [August 6, 2020, 8:42am UTC](https://qa.fmod.com/t/spatializer-bug-with-volume-fmod-studio-2-01-01/16054 "2020-08-06T08:42:12Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Christian1](https://avatars.discourse-cdn.com/v4/letter/c/df788c/32.png) [@Christian1](https://qa.fmod.com/u/Christian1)\ **Post date:** [August 6, 2020, 8:42am UTC](https://qa.fmod.com/t/spatializer-bug-with-volume-fmod-studio-2-01-01/16054/1 "2020-08-06T08:42:12Z")
Hello, The Spatializer Plugin increases volume - but shouldn’t. I can provide a simple test project that shows the behavior. Best, Christian ---
**Author:** ![Christian1](https://avatars.discourse-cdn.com/v4/letter/c/df788c/32.png) [@Christian1](https://qa.fmod.com/u/Christian1)\ **Post date:** [August 14, 2020, 9:01am UTC](https://qa.fmod.com/t/spatializer-bug-with-volume-fmod-studio-2-01-01/16054/2 "2020-08-14T09:01:59Z")
Can anyone confirm this? Compare the effects “Fmod Spatializer” with “Fmod Object Spatializer”. You will notice that Fmod Spatializer increases the Event’s overall volume by ca. 3 dB, whereas Fmod Object Spatializer doesn’t. ---
**Author:** ![joseph](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/joseph/32/264_2.png) [@joseph](https://qa.fmod.com/u/joseph)\ **Post date:** [August 19, 2020, 3:19am UTC](https://qa.fmod.com/t/spatializer-bug-with-volume-fmod-studio-2-01-01/16054/3 "2020-08-19T03:19:56Z")
I haven’t been able to reproduce the issue you describe, but I might know what’s going on. The spatializer effect automatically upmixes a stereo or mono signal to your project’s surround format. The object spatializer effect does not. This means that if the channel format of the signal is less than your project’s surround format, it will be automatically upmixed and distributed across all channels. Upmixing and distributing a signal across multiple channels results in an increase in volume, and I suspect this is what you are hearing when you add a spatializer effect to your event. You can test this by bypassing the spatializer effect. A bypassed effect still alters the channel format of the signal, but does not otherwise process the signal, so you should still hear the volume increase when the spatializer effect is bypassed. You should also be able to hear the volume increase if you remove the spatializer effect altogether and set the event’s audio track output to your project surround format and set the track panner to distributed mode. ---
**Author:** ![dougmolina](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/dougmolina/32/4161_2.png) [@dougmolina](https://qa.fmod.com/u/dougmolina)\ **Post date:** [March 6, 2026, 5:54pm UTC](https://qa.fmod.com/t/spatializer-bug-with-volume-fmod-studio-2-01-01/16054/4 "2026-03-06T17:54:25Z")
Hello! Just coming back to this issue because I’m having the same behaviour in FMOD 2.03.11. If I add a Spatializer to a new event it decreases the volume. If I add multiple Spatializers in sequence, it will keep adding volume to the Event. If I bypass all the Spatializers I think it behaves as if it had one Spatializer (with decreased volume). Besides audible difference, it can also be detected using the Loudness Meter effect. No Spatializer: ![image](https://canada1.discourse-cdn.com/flex036/uploads/fmod/original/2X/3/39f7516801d9d3dc93aee872ae4bf2ad97bf451e.png) One Spatializer: ![image](https://canada1.discourse-cdn.com/flex036/uploads/fmod/original/2X/3/36ae5e9abe527e5a79e00fca97563f72535b91ce.png) Multiple Spatializers: ![image](https://canada1.discourse-cdn.com/flex036/uploads/fmod/original/2X/b/b0a4c2bb530cce4e264f8fbc6e3d240d58462442.png) Multiple spatializers bypassed: ![image](https://canada1.discourse-cdn.com/flex036/uploads/fmod/original/2X/5/528535bee94e543a4f70c3df111e120241ff75c0.png) ---
**Author:** ![joseph](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/joseph/32/264_2.png) [@joseph](https://qa.fmod.com/u/joseph)\ **Post date:** [March 10, 2026, 3:08am UTC](https://qa.fmod.com/t/spatializer-bug-with-volume-fmod-studio-2-01-01/16054/5 "2026-03-10T03:08:52Z")
> [@dougmolina](#): > > If I add a Spatializer to a new event it decreases the volume. The behavior described earlier in this thread was that a spatializer effect could _increase_ the volume of the signal as a side effect of upmixing it. If you’re seeing the volume decreasing, that is likely a different issue. Could you describe the circumstances in which this issue occurs in more detail, so that we can investigate it? ---
**Author:** ![dougmolina](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/dougmolina/32/4161_2.png) [@dougmolina](https://qa.fmod.com/u/dougmolina)\ **Post date:** [May 6, 2026, 7:57pm UTC](https://qa.fmod.com/t/spatializer-bug-with-volume-fmod-studio-2-01-01/16054/6 "2026-05-06T19:57:00Z")
Its basically what I mentioned in the last post. It happens in a new FMOD project, with a new Event, add timeline and any sample, then just add multiple spatializers to the Master track of an event and the volume increases a lot. But if I add just a single Spatializer somehow the volume is lower than without effects. ---
**Author:** ![joseph](https://yyz2.discourse-cdn.com/flex036/user_avatar/qa.fmod.com/joseph/32/264_2.png) [@joseph](https://qa.fmod.com/u/joseph)\ **Post date:** [May 8, 2026, 1:28am UTC](https://qa.fmod.com/t/spatializer-bug-with-volume-fmod-studio-2-01-01/16054/7 "2026-05-08T01:28:23Z")
What speaker channel format is the audio asset you’re using for these tests? I ask because I can’t tell from your screenshots, and it is very likely that the behavior you’re hearing is related to the kind of upmixing/downmixing being performed.