Meyer Sound Documentation

AES75 is a standard that includes Music‑Noise and a detailed procedure for measuring maximum linear sound levels using Music‑Noise. Music‑Noise is a standard test signal that effectively emulates the dynamic characteristics of music. That is why it is called Music‑Noise. It has been developed mathematically within Meyer Sound Laboratories Inc.

In any application requiring reproduction of musical content, Music‑Noise enables a far more accurate measurement of a loudspeaker’s maximum linear sound levels. The AES75 procedure ensures that Music‑Noise measurements yield comparable and independently verifiable results.

Music‑Noise has been incorporated into AES75-2023: AES standard for acoustics. Please visit aes.org/standards/AES75.

Meyer Sound EASE files are calibrated differently from other loudspeaker manufacturers to show AVG SPL and will be comparable to MAPP AVG SPL. Linear Peak SPL will be 12.5dB SPL above the AVG SPL shown in EASE. Therefore, if you read 90dB in EASE, Linear Peak SPL will be 102.5dB with peaks a few dB above that. Each product will achieve a few more dB when using standard playback material (music or speech rather than pink noise) than what is shown. Since EASE does not predict below 100Hz, we do not have EASE files for subwoofer or LFC products. We recommend using MAPP 3D for accurate low-frequency predictions. For more information, see Headroom Predictions Using B-Noise in MAPP XT.