The MLA-3 is a stereo multiband compressor. The input signal is split into three frequency-bands. Each band is passed through a stereo compressor where gain and compression can be altered. The outputs of the compressors are then re-combined and fed to the outputs. There are four different frequencies for each of the two crossovers that can be separately selected for the low-to-mid and the mid-to-high bands.

MLA-3, Maselec
   

The three frequency-band compressors have separate controls so that different parts of theaudio spectrum can be adjusted and tuned.With separate gain controls for each frequency-band, the MLA-3 can be used as an equalizer.

You can always adjust the controls for the separate frequency bands to different settings.

There is no technical reason why they should be the same for all frequencies.

Overall Input and Output gain controls make it easy to set up for different operating levels.
 
MEA-2, Prismsound Orpheus, Prismsound MDS-2, Maselec
DA-2, Prismsound