ManualStd.pdf
(
1146 KB
)
Pobierz
LspCAD
Standard
Users guide
Dedicated to :
Kristina
Jennifer
and
Julia
Ingemar Johansson, IJData
Luleå, Sweden
Email:
ingemar.johansson@ijdata.com
Homepage:
http://www.ijdata.com
Unauthorized copying of this manual or the associated software is a violation
against applicable copyright laws.
LspCAD Standard
September 2002
LspCAD
LspCAD standard
Ingemar Johansson, Luleå, Sweden
Notes
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LspCAD
LspCAD standard
Ingemar Johansson, Luleå, Sweden
Table of contents
1
2
INTRODUCTION ...................................................................1
INSTALLATION ...................................................................3
2.1
C
OPY PROTECTION AND REGISTRATION
...........................................................................3
2.2
T
ECHNICAL SUPPORT
..........................................................................................................5
GENERAL COMMENTS.............................................................6
3.1
M
ISCELLANEOUS STUFF
....................................................................................................6
3.2
L
SP
CAD
DIRECTORY STRUCTURE
.......................................................................................9
3.2.1
Default directories ...........................................................................................9
3.3
B
ACKWARD COMPATIBILITY
.............................................................................................10
3.4
IS WONDERFUL
.....................................................................................................10
THE BOX UTILITY .............................................................. 11
4.1
I
NTRODUCTION
.................................................................................................................11
4.2
C
OMMON MENU PICKS AND DIALOGS
..............................................................................12
4.2.1
Driver unit configuration ...............................................................................15
4.2.2
Driver unit parameters...................................................................................19
4.2.3
General settings.............................................................................................. 22
4.2.4
Transient response......................................................................................... 23
4.2.5
Room and cabinet impact (Room & Cabinet) .............................................. 24
4.2.6
Snapshot ........................................................................................................... 29
4.2.7
Yankee tool........................................................................................................31
4.2.8
System optimization .......................................................................................31
4.2.9
Filter ................................................................................................................. 33
4.3
C
LOSED BOX
..................................................................................................................... 34
4.3.1
Introduction .................................................................................................... 34
4.3.2
The box dialog ................................................................................................. 34
4.4
B
ASSREFLEX BOX
............................................................................................................. 36
4.4.1
Introduction .................................................................................................... 36
4.4.2
The box dialog .................................................................................................36
4.5
D
OUBLE TUNED BASSREFLEX BOX TYPE
1 ....................................................................... 38
4.5.1
Introduction .................................................................................................... 38
4.5.2
The box dialog ................................................................................................. 38
4.6
D
OUBLE TUNED BASSREFLEX BOX TYPE
2 ...................................................................... 39
4.5.1
Introduction .................................................................................................... 39
4.7
P
ASSIVE RADIATOR BOX
................................................................................................. 40
4.7.1
Introduction .................................................................................................... 40
4.7.2
The box dialog ................................................................................................. 40
4.8
B
ANDPASS BOX TYPE
1..................................................................................................... 42
4.8.1
Introduction .................................................................................................... 42
4.8.2
The box dialog ................................................................................................. 42
4.9
B
ANDPASS BOX TYPE
2.................................................................................................... 44
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LspCAD
LspCAD standard
Ingemar Johansson, Luleå, Sweden
4.9.1
Introduction .....................................................................................................44
4.9.2
The box dialog..................................................................................................44
4.10
B
ANDPASS BOX TYPE
3 ....................................................................................................45
4.10.1
Introduction .....................................................................................................45
4.10.2
The box dialog..................................................................................................45
4.11
B
ANDPASS BOX TYPE
4 ....................................................................................................46
4.11.1
Introduction .....................................................................................................46
4.11.2
The box dialog..................................................................................................46
4.12 W
HAT DO THE DIAGRAMS SHOW
?.......................................................................................47
4.12.1
Introduction .....................................................................................................47
4.12.2
Half space (2pi) SPL at 1m distance............................................................47
4.12.3
Cone excursion .................................................................................................47
4.12.4
Port air speed...................................................................................................47
4.12.5
Impedance.........................................................................................................48
4.12.6
Group delay .......................................................................................................48
4.12.7
Filter response.................................................................................................48
4.12.8
Impulse- Step- Tone burst response..........................................................49
4.12.9
SPL in Room & Cabinet....................................................................................49
4.12.10
SPL with port standing wave modes............................................................49
4.12.11
Snapshot............................................................................................................49
4.12.13
Information ......................................................................................................49
4.13
N
ONLINEARITY SIMULATIONS
......................................................................................50
5
THE SIMPLE PASSIVE CROSSOVER UTILITY ................................ 51
5.1
I
NTRODUCTION
............................................................................................................... 51
5.2
M
ENU PICKS
......................................................................................................................53
5.3
T
HE NETWORK DIALOGS
..................................................................................................55
5.4
T
HE DRIVER DIALOGS
......................................................................................................57
5.5
T
HE GENERAL SETTINGS DIALOG
....................................................................................59
5.6
T
HE MUSIC FILTERING FUNCTION
.................................................................................62
5.7
W
HAT DO THE DIAGRAMS SHOW
....................................................................................63
5.7.1
Filter gain..........................................................................................................63
5.7.2
Input impedance ..............................................................................................63
5.7.3
Summed frequency response ........................................................................63
5.7.4
Individual phase response .............................................................................63
5.7.5
Group delay .......................................................................................................63
5.7.6
Impulse resonse...............................................................................................63
5.7.7
Vertical off axis response, surface plot....................................................64
5.7.8
Vertical off axis response, overlay plot.....................................................64
5.7.9
Snapshot............................................................................................................64
5.8
A
FEW HINTS
...................................................................................................................65
5.8.1
Optimizing frequency/phase response .......................................................65
5.8.2
Optimizing the zobel network ......................................................................65
5.8.3
How to use the notch section.......................................................................65
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LspCAD
LspCAD standard
6
Ingemar Johansson, Luleå, Sweden
THE ADVANCED CROSSOVER UTILITY ....................................... 66
6.1
G
ENERAL SETTINGS
........................................................................................................ 68
6.2
T
HE NETWORK DIALOGS
................................................................................................. 68
6.2.1
The network optimizer ...................................................................................71
6.3
T
HE SYSTEM OPTIMIZER
................................................................................................ 75
6.4
T
HE DRIVER DIALOGS
...................................................................................................... 77
6.5
P
ASSIVE CROSSOVER BRANCHES
..................................................................................... 78
6.5.1
Parallel topology .............................................................................................. 78
6.5.2
Series topology ............................................................................................... 79
6.5.3
Circuit elements.............................................................................................. 80
6.5.4
The HP/LP filter wizard................................................................................ 82
6.6
A
CTIVE CROSSOVER NETWORKS
..................................................................................... 83
6.6.1
Circuit elements.............................................................................................. 84
6.6.2
The HP/LP filter wizard................................................................................ 87
OTHER IMPORTANT ISSUES .................................................. 88
7.1
B
UZZ WORDS
.. ................................................................................................................. 88
7.2
E
XPORT
/
IMPORT FILE FORMATS
.................................................................................... 90
7.2.1
Export file formats........................................................................................ 90
7.2.2
Import file formats ........................................................................................91
A SMALL TUTORIAL ........................................................... 92
8.1
L
OUDSPEAKER BOXES
...................................................................................................... 92
8.1.1 Transient response characteristics .................................................................. 92
8.1.2
Power handling................................................................................................. 94
8.1.3
Some construction tips.................................................................................. 96
8.1.4
Cabinet edge diffraction............................................................................... 97
8.1.5
Room impact ..................................................................................................... 98
8.2
C
ROSSOVER NETWORKS
.................................................................................................. 99
8.2.1
Filter order and alignment............................................................................ 99
8.2.2
Measuring driver units ................................................................................. 101
8.2.3
Constructing zobel networks...................................................................... 103
8.2.4
Constructing the rest of the crossover .................................................. 104
8.2.5
System optimization .................................................................................... 107
LITTERATURE.................................................................. 108
7
8
9
iv
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