BassBox Pro - Ljudia

Custom Parallel Double-Tuned Bandpass Box Design
By Magnus J, Ljudia
Email, tech@ljudia.com
Box Properties
--Description--
Name:
Type: Bandpass Parallel Double-Tuned
Shape: Prism, Bandpass with two chambers
--Box Parameters--
Chamber 1 - lower-frequency
Vb = 76,95 liters
V(total) = 86,95 liters
Fb = 51, Hz
QL = 6,515
F3 = 52,54 Hz
Fill = minimal
--Vents--
No. of Vents = 1
Vent shape = rectangle
Vent ends = one flush
Hv = 30, mm
Wv = 455, mm
Lv = 146,2 mm
Chamber 2 - upper-frequency
Vb = 35,91 liters
V(total) = 33,54 liters
Fb = 94, Hz
QL = 6,901
F3 = 123,8 Hz
Fill = minimal
--Vents--
No. of Vents = 1
Vent shape = rectangle
Vent ends = one flush
Hv = 30, mm
Wv = 455, mm
Lv = 67,54 mm
E
D
F
B
chamber 1 chamber 2
G
C
H
J
A
--External Dimensions--
A = 499, mm
B = 648, mm
C = 499, mm
D = 499, mm
E = 499, mm
--Internal Dimensions--
A = 455, mm
C = 455, mm
D = 455, mm
E = 455, mm
F = 420, mm
J = 162, mm
--Wall Thickness--
Outer Sides = 22, mm
Inner Baffle = 22, mm
--Angles--
G = 90,°
H = 90,°
Driver Properties
--Description--
Name: 15SW3A 4W
Type: Standard one-way driver
--Configuration--
No. of Drivers = 1
--Mechanical Parameters--
Fs = 41, Hz
Qms = 16,32
Vas = 76,3 liters
Cms = 80,15 mm/N
Xmax = 7,75 mm
--Electrical Parameters--
Qes = 0,45
Z = 4, ohms
--Electromech. Parameters--
Qts = 0,44
File: Tornado 4ohm 15 bandbass.bb6

Page Two -- Tornado 4ohm 15 bandbass.bb6
c
top & bottom
Box Parts
Box Shape: Bandpass Prism
1 Top, 1 Bottom: height (c) = 499, mm
width (b) = 648,, thickness = 22, mm
1 Front, 1 Back: height (a) = 455, mm
width (b) = 648,, thickness = 22, mm
3 Sides: height (a) = 455, mm
width (d) = 455,, thickness = 22, mm
Baffle Location: e = 420,, f = 162, mm
--Driver Mounting--
Mounting: Flush
Aim: Driver faces chamber 2
a
e
b
front & back
f
d
sides
baffle
--Vent Parts--
1 Top, 1 Bottom: (chamber 1)
width (g) = 455,, length (k) = 146,2 mm
thickness = 12,7 mm
2 Sides: (chamber 1)
height (h) = 55,4, length (k) = 146,2 mm
thickness = 12,7 mm
1 Top, 1 Bottom: (chamber 2)
width (m) = 455,, length (o) = 67,54 mm
thickness = 3,175 mm
2 Sides:
height (n) = 36,35, length (o) = 67,54 mm
thickness = 3,175 mm
g
m
k
o
chamber 2 vent
chamber 1 vent
h
o
n
k

Page Three -- Tornado 4ohm 15 bandbass.bb6
dB
Normalized Amplitude Response (dB-SPL/Hz)
BassBox 6 Pro
6
0
-6
-12
-18
-24
-30
-36
5 Hz 10 50 100 500 1 K 5 K 10 K 20 K
System Impedance (ohms/Hz)
ohms
80
BassBox 6 Pro
70
60
50
40
30
20
10
5 Hz 10 50 100 500 1 K 5 K 10 K 20 K
Phase Response (deg/Hz)
deg
90
BassBox 6 Pro
0
-90
±180
90
0
-90
±180
5 Hz 10 50 100 500 1 K 5 K 10 K 20 K
msec
24
Group Delay (msec/Hz)
BassBox 6 Pro
20
16
12
8
4
0
-4
-8
5 Hz 10 50 100 500 1 K 5 K 10 K 20 K