Mixes should be made at consistent listening levels because the variation in the frequency response of the ear at different sound-pressure levels results in a mix sounding quite different at different monitoring levels. The level used should ideally be the same as that at which the listener will hear the record. Since most people listen to music at moderate volume, moderate monitoring levels (80- to 90-dB spl) should be used.
The mix should be tested for mono/stereo compatibility to see what changes in instrumental balances will occur when the material is played in these different formats. If the changes are drastic, the original mix may have to be modified to make, for example, an acceptable mono video mix of a stereo LP mix. A mono mix should also be monitored over a car radio type of monitor, such as the Auratone speakers to see how it will sound on a system with limited frequency response. If the mix is for a single rather than for an LP, the entire mixdown session may be done at low volume over the car radio speakers.
