Master a long audiobook or podcast in one file

November 9, 2026 · All posts

Audiobooks, podcasts, lectures and DJ sets are long. Echoteka now masters a recording up to 2 hours in one file, so you no longer have to cut it into pieces and match their loudness by hand.

Three steps

1. Upload the file to mastering. For anything longer than 10 minutes the app shows the price and the processing time before you start.
2. Pick the type: Voice, Podcast, Audiobook or Music.
3. Pick WAV 24-bit, FLAC or MP3 and press "Process". Close the tab if you like: we email you when it is ready, and the result waits under "My long tracks" for 72 hours.

Long recordings need a free account, so the result and the credits are tied to you. You can cancel at any time and the credits come back.

One loudness from start to finish

The server works through the recording in one-minute parts, but every decision is made once for the whole file: loudness, tone and the noise profile. Each part starts processing a little early so the processing settles as in one continuous pass, joins are placed in quiet moments, and a 4-second overlap is crossfaded. The final gain and the limiter then run over the joined file as a whole. In our tests the joined result matched one-pass processing to below −80 dB.

Targets

• Voice and Podcast: −16 LUFS, peak −1 dBTP.
• Audiobook: −19 LUFS, peak −3 dBTP, in line with the ACX guide (RMS −18 to −23 dB).
• Music (DJ set, live show): −14 LUFS, peak −1 dBTP.

Price

Up to 10 minutes costs 1 credit, like regular mastering. Each started 15 minutes after that adds 1 credit: 47 minutes is 4 credits, 2 hours is 9 credits. If processing fails or you cancel, the credits come back.

Formats

Input: WAV, FLAC, MP3, M4A, AAC, OGG, Opus, AIFF, WMA and WebM. For long recordings FLAC or MP3 is handier: two hours of WAV is over a gigabyte.

Questions

How long can the file be? Up to 2 hours in one file. Split longer recordings, for example by chapter.

Does the free daily master cover it? No. A long recording takes far longer to process than a song, so it is always paid by length, and the exact price is shown before you start.

What if processing fails? The credits go back to your balance automatically.

Process a long recording →