Reference Level Audio System

THX reference level explained - Acoustic Frontiers

http://www.acousticfrontiers.com/2013314thx-reference-level/#:~:text=Reference%20level%20means%20two%20things%20for%20home%20theater,asked%20to%20produce%20105dB%20for%20a%200dB%20signal.

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Q. What are the reference levels in digital audio systems?

https://www.soundonsound.com/sound-advice/q-what-are-reference-levels-digital-audio-systems

Reference Level - Part One - Power Sound Audio

https://www.powersoundaudio.com/pages/reference-level-part-one

Reference level simply means that a recognized signal will be produced at a certain volume level at the seating position / microphone position. That's it. When calibrating the system the recognized signal is usually band limited (500hz to 2000hz for the full range channels) pink noise recorded at -30dBFS.

THX reference level explained - Acoustic Frontiers

http://www.acousticfrontiers.com/2013314thx-reference-level/

Reference level means two things for home theater design: 1. Speakers and amplifiers must be capable of 105dB peaks If the playback chain is calibrated to produce 85dB for a... 2. Subwoofers must be capable of 115dB peaks

Reference Level - Part Two - Power Sound Audio

https://www.powersoundaudio.com/pages/reference-level-part-two

First, let us remember that at reference level a home theater system will require each main channel to have 105dB of headroom and the subwoofer(s) to have 118-121dB of headroom. This assume all speakers are set to small with the deepest bass from all the main speaker combined and sent to the subwoofer(s) along with the LFE channel.