Quest Engineering QMotion QM 12MP User Manual
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QM 12MPUser ManualUser Manual Q Motion SeriesQM 12MP6Speaker Placement for Maximum Stage Monitor PerformanceThe QM 12MP is primarily intended for use as a stage monitor in mirrored pairs or as single speakerboxes. They can also be employed as single or small array front of house boxes for short throwwide dispersion applications.When two standard design fold-back monitors are placed in close proximity to each other and arereproducing the same signal, “interference effect” between the speaker transducers will contributeto uneven frequency response. This is called “comb filtering” and is impossible to correct with EQalone. The QM 12MP is designed to minimize this potential problem.Two conventional monitors with top mounted HF horns. Regardless of where they are located,the HF horns spill across each other and this causes “tangential interference” as the mid-highfrequency waves intersect and create both peaks and cancellations which will radically change thefrequency response in different areas of the sound field.This is the source “hot zones” found as you move a microphone in an arc in front of a pair ofmonitors.The “mirror” design allows a monitor engineer to locate the HF horns at a greater distance apartand lower the level of interference between the boxes.If more low frequency output is required, moving the boxes closer together will increase the totalpotential for more bass without causing excessive HF interference.Technically, this box placement is called “coupling the bass drivers”. Placing two bass drivers nextto each other has the potential of increasing the low frequency response by at least 3dB.Figure 1Figure 2Fig 1 Fig 2Fig 2 Fig 3Fig 1 FigFig 1 Fig 2 Fig 3 |
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