http://www.customaudiodesigns.co.uk/sof ... nitors.htmhttp://www.customaudiodesigns.co.uk/soffit-mounting-control-room-monitors.htm írta:
A small speaker baffle is not ideal because the diffraction effect of the edges causes slightly delayed reflections to be produced which degrade the response and imaging of the system.
The frequency response dip caused by a reflection.
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Generally, in most rooms, free standing speakers are surrounded by walls/ceiling/floor that will generate reflections. These surfaces act as acoustical mirrors to the speaker's radiation, enhancing or cancelling the direct sound, depending on the phase difference between the reflection and the direct sound where you are sitting.
Generally, at lower frequencies, the reflected sound from the wall behind the speakers interferes with the direct sound. This is often in phase with the direct sound and causes deep peaks and troughs in the frequency response. These effects, depending on the relative amplitude of the direct vs reflected sound, can be between 6dB-20dB!!
The frequency of the first dip can be calculated by measuring the distance of the speaker to the wall. Divide 340 (the speed of sound in metres) by four times the speaker distance and you will have the dip frequency. Obviously further cancellations will occur at increasing harmonic frequencies.
http://www.genelec.cn/faq/acoustical/fl ... -monitors/http://www.genelec.cn/faq/acoustical/flush-mounting-monitors/ írta:
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 , (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.
Igen az utolsó kitétel fontos
, viszont elvileg ilyen átlátszó akril lekerekítés megfelelhet oda , ami felületkezelés miatt nem csillan be hanem teljesen átlátszó , szóval még mindig téglalapformának néz ki a dolog , nem kitüremkedésnek .
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