README.TXT					October 2001

DISTRIBUTED SYSTEM DESIGN (DSD) v1.3.3 for WINDOWS 95/98/NT

JBL PROFESSIONAL
8400 Balboa Blvd.
Northridge, CA  91329
Tel: (818) 894-8850
URL: http://www.jblpro.com


PROGRAM SUMMARY
===============
DISTRIBUTED SYSTEM DESIGN is a software utility that calculates
and displays speaker spacing and positioning for a rectangular room, 
as well as computes the number of in-ceiling subwoofers to use.

Several acoustical calculations are made and the resulting document
can be saved and printed.

note:  DSD v1.3.3 requires that a file named MFC40.DLL be placed in your
Windows SYSTEM directory. If you get an error message stating that this 
file cannot be located, search other directories on your machine, or
download the file from the Software Downloads area at the JBL Professional
Web Site (www.jblpro.com). 


ADDITIONS AND ENHANCEMENTS
==========================
v1.3.3
  *  The Control 19 Subwoofer Utility has been added.

v1.3.2
  *  The Control 24 Micro models have been added.

v1.3.1
  *  The Control 23, 25 and 28 models have been added.
  *  The program now saves the English or Metric units setting.
  *  The listener height can now be changed by the user.
  *  Extra dimensions have been added to the room layout drawing.


DISKETTE CONTENTS
=================
The distribution diskette contains the following files:

  *   The executable program, DSDv1_3_3.EXE.

  *   This README.TXT file.

  *   CADP2 device files and drawing files for Control 24C Micro, 
      Control 24C and Control 26C.

  *   EASE v2.x catalog file with data for the Control 23,23T,
      Control 24C/CT Micro, Control 24C,24CT, Control 25,25T,
      Control 26C,26CT and Control 28,28T


USING THE CADP2 DEVICE FILES
============================
To utilize the Control 24C Micro, 24C and 26C device and drawing files,
simply place the files in your C:\CADP2\DEVICES directory and re-start
CADP2. The Control 24C Micro, 24C and 26C should each appear as Measured
Devices.


PROGRAM INSTALLATION
====================
To use the program, simply run DSDv1_3_3.EXE from the floppy disk
or copy the file to another drive a run from there.  No special installation 
procedure is required.


PROGRAM USAGE
=============
To begin a new design:

  1.  Run DSDv1_3_3.EXE

  2.  Select DISTRIBUTED SYSTEM DESIGN | NEW DESIGN from the menu bar.

  3.  Enter all information:

	a.  Project Name

	b.  Date

	c.  Room length, width and height

	d.  Speaker selection (see below).

	e.  Layout type (see below)

	f.  Coverage pattern spacing (see below)

The program will display the room outline, resulting layout pattern and a
summary of all calculations (see below).  This document can then be saved
and/or printed for future reference.


PROGRAM PREFERENCES
===============
To change the units of measure between English (feet) and metric
(meters), select DISTRIBUTED SYSTEM DESIGN | PREFERENCES from the menu
bar. The listener height offset can also be adjusted.


SAVING A DESIGN
===============
Once the design is completed, select FILE | SAVE from the menu bar.


OPENING A DESIGN
================
Select FILE | OPEN from the menu bar.


PRINTING A DESIGN
=================
Once the design is completed or opened, select FILE | PRINT from the menu bar.


MODIFYING A DISPLAYED DESIGN
============================
Select DISTRIBUTED SYSTEM DESIGN | NEW DESIGN from the menu bar.


MODIFYING A SAVED DESIGN
==================
Open a design and select DISTRIBUTED SYSTEM DESIGN | NEW DESIGN from the menu bar.


SPEAKER SELECTION
=================
Speaker Selection choices include the following:

Control 24C Micro, 4.5" 2-way -- 8 ohms direct
Control 24CT Micro -- 8W tap (100V or 70V)
Control 24CT Micro -- 4W tap (100V or 70V)
Control 24CT Micro -- 2W tap (100V or 70V)
Control 24CT Micro -- 1W tap (100V or 70V)
Control 24CT Micro -- 0.5W tap (70V only)

Control 24C, 4" 2-way -- 16 ohms direct
Control 24CT -- 30W transformer tap (100V or 70V)
Control 24CT -- 15W transformer tap (100V or 70V)
Control 24CT -- 7.5W transformer tap (100V or 70V)
Control 24CT -- 3.7W transformer tap (70V only)

Control 26C, 6.5" 2-way -- 16 ohms direct
Control 26CT -- 60W transformer tap (100V or 70V)
Control 26CT -- 30W transformer tap (100V or 70V)
Control 26CT -- 15W transformer tap (100V or 70V)
Control 26CT -- 7.5W transformer tap (70V only)

Control 23, 3.5" 2-way -- 8 ohms direct
Control 23T -- 5W tap (70V only)
Control 23T -- 10W tap (100V only)

Control 25, 5.25" 2-way -- 8 ohms direct
Control 25T -- 30W tap (100V or 70V)
Control 25T -- 15W tap (100V or 70V)
Control 25T -- 7.5W tap (100V or 70V)
Control 25T -- 3.7W tap (70V only)

Control 25AV, 5.25" 2-way -- 8 ohms direct
Control 25AV -- 60W tap (100V or 70V)
Control 25AV -- 30W tap (100V or 70V)
Control 25AV -- 15W tap (100V or 70V)
Control 25AV -- 7.5W tap (70V only)

Control 28, 8" 2-way -- 8 ohms direct
Control 28T-60 -- 60W tap (100V or 70V)
Control 28T-60 -- 30W tap (100V or 70V)
Control 28T-60 -- 15W tap (100V or 70V)
Control 28T-60 -- 7.5W tap (70V only)


Listener Height
===============
The listener height is the distance from the floor to the ear-level of a
listener in the room.  The default distance is 4 feet (English) and 1.22
meters (metric).  This setting can be changed by selecting DISTRIBUTED
SYSTEM DESIGN | PREFERENCES from the menu bar.


LAYOUT TYPE and COVERAGE PATTERN SPACING
========================================
Layout Type choices are:

Square
Hexagonal

These layout types refer to the geometric pattern used to position the speakers
in a room.

Coverage Pattern choices include:

Maximum Overlap
Minimum Overlap
Edge-to-edge
1.4 X edge-to-edge
2 X edge-to-edge

These coverage patterns refer to the overlap of the isobar corresponding to the
-6 dB contour of the loudspeaker.

For a given Coverage Pattern, the corresponding expected level variation for the
room is displayed.  Level variation = Expected Maximum SPL - Expected Minimum SPL.

CONTROL 19 SUBWOOFER UTILITY
============================
Use this utility after you have completed your design of ceiling speakers.
1) Enter the number of ceiling speakers in the room.
2) Enter the model of ceiling speaker:  Control 24 Micro, Control 24 or Control 26.
3) Enter whether you are operating the ceiling speakers low impedance (8 or 16 ohms)
   or operating them at 70V/100V, and if so whether most of them are tapped on
   the highest two power taps or on the lowest two power taps.
4) Enter the type of bass performance you want in this venue:  Light ambient bass for 
   background music, general bass for foreground music, or superior bass.
5) Enter whether most of the subwoofers are expected to be located close to walls, 
   most are located away from walls, or if there is a fairly even mixture of both
   placements.  While your design might not exactly fit these categories, choose 
   the selection that is closest.
6) Enter whether the room is fairly dead acoustically (non-reverberant), fairly
   reverberant, or in-between.  Again, choose the selection that is closest.

The computed quantity of subwoofers applies either to Control 19CS subs for low 
impedance (8 ohm) operation, or to Control 19CST subwoofers tapped at 60W for 70V 
or 100V distributed speaker systems. For tapping at 30W, double the number of 
subwoofers. The answer is rounded to tenths to let system designers determine 
for themselves whether to round up or round down.  The utility does not 
allow less than 1/12th the number of ceiling speakers in the room.

REFERENCES
==========
For a more thorough description of the algorithms used by this program, check the
following sources:

Sound System Engineering
Davis and Davis
Howard W. Sams & Co. (1987)

Electroacoustical Reference Data
Eargle
Van Nostrand Reinhold (1994)

Handbook for Sound Engineers, The New Audio Cyclopedia
Ballou, ed.
Howard W. Sams & Co. (1987)


Acoustical Calculations
=======================
A summary of acoustical calculations is given below:

Maximum Continuous Average SPL (Pink Noise, dB)
				     =	speaker sensitivity (1W/1m)
				   	+ input power gain
				   	- inverse square loss
				   	+  additional SPL from Coverage Pattern.

Maximum Continuous Peak SPL (Pink Noise, dB)
				     =	Maximum Continuous Average SPL + 6.

Maximum Continuous Average SPL (music/speech, dB)
				     =	Maximum Continuous Peak SPL - 10.

Recommended Amplifier Power
		=  120% of sum of taps (transformer versions)

	     or =  sum of speaker power handling to
		   2X sum of speaker power handling (non-transformer versions)


SPECIAL THANKS
==============
JBL Professional would like to thank Joe Etrick of Professional Electronic Systems
and Pat Brown of Synaudcon for their input and suggestions during the original 
writing of this program.  We would also like to thank John Eargle of JME 
Consulting for engineering parameters and confirmation of validity of the 
predictions and Mike Paganini of JBL Professional for implementing this program.


UPDATES
====================
Check the JBL Professional Web Site (http://www.jblpro.com) for future updates.
