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Technical resources

Audio levels and radio mics

Line-up and loudness numbers for event streams, and where UK radio mics stand after Ofcom made two more bands licence-exempt in April 2026.

PDF, 1 page · 240 KB · Updated November 2026

Two things go wrong with event audio more than anything else: the stream mix arrives at the wrong level because two pieces of kit were lined up to different conventions, and a radio mic dies because nobody coordinated frequencies with the house. This sheet covers both.

What's on it

  • EBU and SMPTE line-up levels side by side, and why a US camera reads 2 dB low on a UK desk.
  • Loudness targets for broadcast delivery, podcast platforms and streams.
  • dBu and dBV, and what to do with a laptop output.
  • The EBU and GLITS stereo idents, so you can check legs by ear.
  • UK radio mic bands: Channel 38, co-ordinated channels, and the bands Ofcom made licence-exempt on 29 April 2026.

The tones it refers to are in our free audio line-up pack.

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