Is flush-mounting monitors a good idea?

ALL monitors that are traditional 'square box type' designs benefit from flush-mounting for the following reasons:

  • Edge diffraction is eliminated so the midrange is smoother
  • Eliminates the cancellation reflection from the wall behind the monitor
  • Acoustical loading is increased so the monitor does not have to work so hard at low frequencies

The following should be considered when flush-mounting any monitor:

  • For the benefits listed above the wall construction should be solid and consisting of heavy mass material. However this can lead to reverberation time problems at low frequencies
  • If the wall is totally solid and reflective then some lower midrange boost may occur, so make the wall slightly absorptive around the 200 to 500 Hz region - use 10 to 20 cm thick rock wool or foam plastic glued onto the front wall surface
  • Amplifier cooling, possibly forced air-cooling, should be sufficient if the amplifier is not separately rack mounted (rack-mount kits are available for the 1032A, (S30D - discontinued), 1037C and 1038B)
  • The monitor's acoustical tone controls must support the change in acoustical loading presented by the hard wall where the monitors are flush mounted and which implements then an ‘infinite baffle’ load. If these adjustments are not done, then a flat frequency response may not be achieved.
  • The flush mounting details around the enclosure should be as smooth as possible; otherwise the cabinet edge diffraction benefits will be wasted.