---
title: What is the MPO/OSPL90 of Audeara’s headphones?
description: Audeara’s headphones are an assistive listening device and do not process live audio signals, so the MPO measurement is not applicable.
---

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# What is the MPO/OSPL90 of Audeara’s headphones?

The MPO is defined as a device’s maximum sound output level prior to saturation in response to an incoming, uncompressed audio signal. Audeara’s headphones are an assistive listening device and do not process live audio signals, so the MPO measurement is not applicable. Instead the devices’ maximum sound output is measured at full on gain (FOG). 

 

**Learn more:** [What is the maximum volume output at full-on-gain (FOG)?\*](https://support.audeara.com/what-is-the-maximum-volume-output-at-full-on-gain-fog)

 

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