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Ian & Stuart's Australian Mac 1993 September
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Demo Quick Start (TeachText)
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Demo Quick Start For MacSpeakerz, The Speaker Design Toolbox
I. Closed Box Evaluation
• Launch the MacSpeakerz Demo Disk.
• Notice that the driver you will be evaluating is loaded in the Driver and Subsystem
Parameters window, the Nordschow-Wright NW1800.
• Activate the Box Parameters window by clicking on it once or use the left/right
scroll keys to activate the windows.
• Activate the VB, (Box Volume), field by clicking on it. Try a box volume of 2 cu ft
followed by Return. (Or use the Box Calculators under the Box Menu (at top) to design
your enclosure).
• Notice that the Qtc (Closed Box Q) has been calculated.
Note: You can also approach your enclosure design by entering a Qtc (Closed Box Q), and
the corresponding VB (Box Volume) will be calculated. Try the Butterworth alignment
of .707 in the Qtc field, followed by return. This alignment will give you the flattest and
most extended Frequency Response.
• Do a Command F from the keyboard.
• Check out the Frequency Response curve!
• Store it in memory 1 by doing a Command1.
• Note that under m at the right side of the Response window a 1 has been displayed to
indicate that you have information stored for that memory.
• Look under the Box Menu and open the Box Dimensions window.
• There are three recommended enclosure dimensions to choose from which have good
side to side ratios. Close window when done. (use a Command W from the keyboard)
Continue for Vented Box Evaluation
II. Vented Box Evaluation
• If you want to design a vented enclosure, enter the frequency that you want to tune
the box to, 40 Hz for example, in the Box Freq field, FB, followed by return.
• Notice that the minimum recommended vent area, Sv MIN, has been calculated.
• Do a Command F from the keyboard to see what the curve will look like tuned to 40 Hz.
• Experiment with various frequencies until you find the curve that you want.
• Store the selected response in memory 2 by doing a Command 2.
• Do a Command E from the keyboard to clear the Response window and recall memory 1,
the closed box, by typing 1 from the keyboard. The Box Parameters window will be
refreshed with the contents of the selected memory. Now recall memory 2, the vented
box, by typing 2.
• Now choose a vent(s) from under the Vent menu. The vent length has been calculated in
the Lv field. The length listed will be per vent. A vent which gives you a negative
number would not be feasible.
• Print your report by doing a Command P.
Additional information:
• The On/Off status of each response is shown under the Analysis menu by the checkmark
at the left of the menu item. Only those responses that are selected are actually calculated.
• You have two choices for the Frequency Response. You can choose between 0 dB Mode
and dB SPL Mode which can tell you the dB SPL (loudness) of the proposed system.