AFMG Network Forums for AFMG Software
 Posted: Thu Jun 30, 2011 12:16 pm
 Predrag Member Joined: 26 May 2011 Posts: 11

 Dear Sir, I work as a design engineer for telecommunication installation in buildings, hotels etc. For a long period of time I am trying to figure out how to mathematically determine ceiling speaker coverage area and number of speakers in distributed ceiling speaker design in a manner to be in correlation with the data produced by your software (Ease Address). For example: • Room dimensions: 13m x 6m x 3m (WxDxH), • Ceiling speaker: BOSCH LBC 3086/41, SPL 6W/1W (at 1kHz/4kHz) 98/90 dB, Opening angle: (at 1kHz/4kHz, -6dB) 180o/50o, Tap: 3W • Software adjustment: Overlap type: Minimum overlap, Type: Direct SPL, Frequency: 4000Hz, Bandwidth: 1 octave. Layout type: Square Formula used for calculations (source book „Sound System Engineering“ by DON DAVIS): Speaker distance: S=sqrt(2)*(h-l)*tan(coverage angle/2) Where: h – room height in meters, l – ear height (1,7m), coverage angle – speaker coverage angle at 4kHz, Number of speakers: N= (X*Y)/(2*((h-l)*tan(α/2))2) Where: X – room width in m, Y – room depth in m. Here are the results: Ease Address: 1) Speaker distance: 1.2m, 2) Number of speakers: 55. My calculations: 1) Speaker distance: 0.85m, 2) Number of speakers: 106,13.. I don’t know where the problem is. Please help me? But the most important thing to know is which formulas you use in Ease Address: 1) To determine speaker distance and 2) To determine level variation due the layout pattern, Thank you
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