How to increase the volume in an m4a file?

I have an m4a file. When listening to it on my iPod Touch, the volume is too low, even when I turn it all the way up.

I need to increase the volume in the file so that I can hear what is being said.

Also, in the background it sounds like there is a hissing sound that I'd like to get rid of.

Phenom

Posted 2009-12-19T13:09:46.243

Reputation: 6 119

I'm assuming you mean m4v, not "m4b"? – Nate Koppenhaver – 2011-11-27T20:45:40.370

try audacity.

– gadgetmo – 2012-01-30T19:11:08.780

Answers

I'd use mp3gain or AACGAIN for that. The former's GUI works with AACGAIN too, but AACGAIN is the app for m4as.

It'll let you batch modify the volume of files to a certain level without loss of quality.

Journeyman Geek

Posted 2009-12-19T13:09:46.243

Reputation: 119 122

From looking at the web page for mp3gain, it looks like it's for averaging the volume of a set of MP3 files. Can it adjust the volume of a single file? – Marc Stober – 2016-03-03T12:09:20.640

You need to look at "Auto Volume Levelling". This is done on your PC/MAC.

This page has instructions for iTunes as well as other music apps.

Though if you've got a background hiss already, this could get louder too. You'd need to look at some more serious filtering software for that.

ChrisF

Posted 2009-12-19T13:09:46.243

Reputation: 39 650