The nature of turntable rumble is analyzed, with the object of evolving a method for rating the performance quality of turntables with respect to rumble. Spectral distribution of rumble of a typical turntable is shown, identifying the effect of resonances of the pickup arm, and the audibility characteristics of rumble are reviewed, in the light of the equal loudness contour characteristics of the ear and the typical noie in the room. A weighting network of 6 dB per octave below 500 Hz with 12 dB attenuation above 500 Hz is suggested, and several possible methods of converting the spectral response of rumble into a number corresponding to a relative loudness level are considered. It is concluded that probably the best method, from the practical standpoint, is the measurement of the rms voltage level of rumble through the weighting network, relative to the level of a 1000 Hz 5 cm/sec rms standard tone (without the network). The resulting number, in dB, is defined as the Relative Rumble Loudness Level (RRLL).
https://www.aes.org/e-lib/browse.cfm?elib=1109
Click to purchase paper as a non-member or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members and is free for AES members and E-Library subscribers.
Learn more about the AES E-Library
Start a discussion about this paper!
