---
title: AudioUnitFrequencyResponseBin
framework: audiotoolbox
role: symbol
role_heading: Structure
path: audiotoolbox/audiounitfrequencyresponsebin
---

# AudioUnitFrequencyResponseBin

An audio unit’s audio level at a particular frequency.

## Declaration

```swift
struct AudioUnitFrequencyResponseBin
```

## Overview

Overview An array of AudioUnitFrequencyResponseBin are passed in to kAudioUnitProperty_FrequencyResponse with the mFrequency field filled in. The array is returned with the mMagnitude fields filled in. If fewer than kNumberOfResponseFrequencies are needed, then the first unused bin should be marked with a negative frequency.

## Topics

### Initializers

- [init()](audiotoolbox/audiounitfrequencyresponsebin/init().md)
- [init(mFrequency:mMagnitude:)](audiotoolbox/audiounitfrequencyresponsebin/init(mfrequency:mmagnitude:).md)

### Instance Properties

- [mFrequency](audiotoolbox/audiounitfrequencyresponsebin/mfrequency.md)
- [mMagnitude](audiotoolbox/audiounitfrequencyresponsebin/mmagnitude.md)

## Relationships

### Conforms To

- [BitwiseCopyable](swift/bitwisecopyable.md)
- [Sendable](swift/sendable.md)

## See Also

### Structures

- [AudioUnitConnection](audiotoolbox/audiounitconnection.md)
- [AudioUnitEvent](audiotoolbox/audiounitevent.md)
- [AudioUnitExternalBuffer](audiotoolbox/audiounitexternalbuffer.md)
- [AudioUnitMeterClipping](audiotoolbox/audiounitmeterclipping.md)
- [AudioUnitMIDIControlMapping](audiotoolbox/audiounitmidicontrolmapping.md)
- [AudioUnitOtherPluginDesc](audiotoolbox/audiounitotherplugindesc.md)
- [AudioUnitParameter](audiotoolbox/audiounitparameter.md)
- [AudioUnitParameterEvent](audiotoolbox/audiounitparameterevent.md)
- [AudioUnitParameterHistoryInfo](audiotoolbox/audiounitparameterhistoryinfo.md)
- [AudioUnitParameterNameInfo](audiotoolbox/audiounitparameternameinfo.md)
- [AudioUnitParameterIDName](audiotoolbox/audiounitparameteridname.md)
- [AudioUnitParameterInfo](audiotoolbox/audiounitparameterinfo.md)
- [AudioUnitParameterOptions](audiotoolbox/audiounitparameteroptions.md)
- [AudioUnitParameterStringFromValue](audiotoolbox/audiounitparameterstringfromvalue.md)
- [AudioUnitParameterValueFromString](audiotoolbox/audiounitparametervaluefromstring.md)