In the detailed title description, what is that fraction number beside Noise Floor?
When viewing detail title descriptions, you will notice a pair of negative numbers resembling a fraction, beside the Noise Floor category. This provides you with an idea of the amount of surface noise which will be heard on the recording. It is a measurement in decibels, and is in the format of (beginning of record)/(end of record). Sound energy is measured in units, called decibels (dB). Zero is defined as the loudest sound possible. A sound which is -3dB will be half as loud as maximum volume. A sound at -6dB is one quarter as loud. Noise levels in the teens will be quite noticeable, Levels in the minus 20s will be very quiet. It should be understood that before 1910, the commercial record industry was still in its infancy. Higher levels of surface noise were a natural limitation in the technology. This is not normally an indication of record wear. New records of this time would have less than 30dB of dynamic range (compared to 90dB for a modern CD). We have also tried to provide a r
