Beta-8CX - Eminence Speaker

Beta8CX Small Vented Cabinet
By Jerry McNutt, Eminence Speaker LLC
200 Watt Displacement Limit; Use above 100 Hz.
Small design that can handle a lot of power if used with a Subwoofer.
Box Properties
--Description--
Name:
Type: Vented Box
Shape: Prism, square
--Box Parameters--
Vb = 0.25 cu.ft
V(total) = 0.3 cu.ft
Fb = 102 Hz
QL = 7
F3 = 102.8 Hz
Fill = minimal
--Vents--
No. of Vents = 1
Vent shape = round
Vent ends = one flush
Dv = 3 in
Lv = 4.618 in
Normalized Amplitude Response (dB-SPL/Hz)
Eminence Designer
dB
6
0
-6
-12
-18
-24
-30
-36
5 Hz 10 50 100 500 1 K 5 K 10 K 20 K
Custom Amplitude Response (dB-SPL/Hz at 1 m) with 200 watts
Eminence Designer
Driver Properties
--Description--
Name: Beta-8CX - LF
Type: Two-way coaxial driver
Company: Eminence Speaker LLC
Comment: Revised OCT 2008
dB
125
119
113
Piston: Paper cone.
107
Suspension: Cloth surround.
Dust Cap: Solid composition paper dust cap. 101
Frame: Pressed steel basket.
95
Voice Coil: 2 inch (50.8 mm) coated copper. Kapton former.
Magnet: 38 oz ferrite magnet.
--Configuration--
89
83
No. of Drivers = 1
--Driver Parameters--
5 Hz 10 50 100 500 1 K 5 K 10 K 20 K
Fs = 65.52 Hz
Qms = 8.82
Maximum Acoustic Power (dB-SPL/Hz at 1 m)
Eminence Designer
Vas = 0.706 cu.ft
dB
Xmax = 0.126 in
Sd = 32.55 sq.in
124
Qes = 0.34
Re = 5.58 ohms
118
Le = 0.85 mH
112
Z = 8 ohms
Pe = 250 watts
106
100
94
88
82
5 Hz 10 50 100 500 1 K 5 K 10 K 20 K
File: Beta8CXSmallVentedBox200Watts.bb6

Page Two -- Beta8CXSmallVentedBox200Watts.bb6
Cone Displacement (mm/Hz) with 200 watts
mm
16
Eminence Designer
14
12
10
8
6
4
2
5 Hz 10 50 100 500 1 K 5 K 10 K 20 K
Vent Air Velocity (m/sec/Hz) with 200 watts
m/s
48
Eminence Designer
42
36
30
24
18
12
6
5 Hz 10 50 100 500 1 K 5 K 10 K 20 K
System Impedance (ohms/Hz)
ohms
80
Eminence Designer
70
60
50
40
30
20
10
5 Hz 10 50 100 500 1 K 5 K 10 K 20 K

Beta8CX Medium Vented Cabinet
By Jerry McNutt, Eminence Speaker LLC
Displacement Limted to 100 Watts; F3 at 74 Hz.
Best used above 95 Hz. Compact two-way Sat.
Box Properties
--Description--
Name:
Type: Vented Box
Shape: Prism, square (optimum)
--Box Parameters--
Vb = 0.55 cu.ft
V(total) = 0.599 cu.ft
Fb = 70 Hz
QL = 7
F3 = 73.84 Hz
Fill = minimal
--Vents--
No. of Vents = 1
Vent shape = round
Vent ends = one flush
Dv = 3 in
Lv = 4.352 in
Normalized Amplitude Response (dB-SPL/Hz)
Eminence Designer
dB
6
0
-6
-12
-18
-24
-30
-36
5 Hz 10 50 100 500 1 K 5 K 10 K 20 K
Custom Amplitude Response (dB-SPL/Hz at 1 m) with 100 watts
Eminence Designer
Driver Properties
--Description--
Name: Beta-8CX - LF
Type: Two-way coaxial driver
Company: Eminence Speaker LLC
Comment: Revised OCT 2008
dB
122
116
110
Piston: Paper cone.
104
Suspension: Cloth surround.
Dust Cap: Solid composition paper dust cap. 98
Frame: Pressed steel basket.
92
Voice Coil: 2 inch (50.8 mm) coated copper. Kapton former.
Magnet: 38 oz ferrite magnet.
--Configuration--
86
80
No. of Drivers = 1
--Driver Parameters--
5 Hz 10 50 100 500 1 K 5 K 10 K 20 K
Fs = 65.52 Hz
Qms = 8.82
Maximum Acoustic Power (dB-SPL/Hz at 1 m)
Eminence Designer
Vas = 0.706 cu.ft
dB
Xmax = 0.126 in
Sd = 32.55 sq.in
124
Qes = 0.34
Re = 5.58 ohms
118
Le = 0.85 mH
112
Z = 8 ohms
Pe = 250 watts
106
100
94
88
82
5 Hz 10 50 100 500 1 K 5 K 10 K 20 K
File: Beta8CXMedVentedBox100Watts.bb6

Page Two -- Beta8CXMedVentedBox100Watts.bb6
Cone Displacement (mm/Hz) with 100 watts
mm
16
Eminence Designer
14
12
10
8
6
4
2
5 Hz 10 50 100 500 1 K 5 K 10 K 20 K
Vent Air Velocity (m/sec/Hz) with 100 watts
m/s
48
Eminence Designer
42
36
30
24
18
12
6
5 Hz 10 50 100 500 1 K 5 K 10 K 20 K
System Impedance (ohms/Hz)
ohms
80
Eminence Designer
70
60
50
40
30
20
10
5 Hz 10 50 100 500 1 K 5 K 10 K 20 K

Beta8CX Sealed High Power Midrange Enclosure
By Jerry McNutt, Eminence Speaker LLC
Thermally Limited to 250 Watts; must use a steep high pass filter set to
200 hz or above.
Box Properties
--Description--
Name:
Type: Closed Box
Shape: Prism, square
--Box Parameters--
Vb = 0.0999 cu.ft
V(total) = 0.128 cu.ft
Qtc = 0.712
QL = 20
F3 = 172.7 Hz
Fill = heavy
Normalized Amplitude Response (dB-SPL/Hz)
dB
6
0
-6
-12
-18
-24
Eminence Designer
Driver Properties
--Description--
-30
-36
Name: Beta-8CX - LF
Type: Two-way coaxial driver
Company: Eminence Speaker LLC
5 Hz 10 50 100 500 1 K 5 K 10 K 20 K
Comment: Revised Oct 2008
Custom Amplitude Response (dB-SPL/Hz at 1 m) with 250 watts
Eminence Designer
Piston: Paper cone.
Suspension: Cloth surround.
dB
Dust Cap: Solid composition paper dust cap. 126
Frame: Pressed steel basket.
120
Voice Coil: 2 inch (50.8 mm) coated copper. Kapton former.
Magnet: 38 oz ferrite magnet.
114
--Configuration--
108
No. of Drivers = 1
102
--Driver Parameters--
Fs = 65.52 Hz
96
Qms = 8.82
Vas = 0.706 cu.ft
90
Xmax = 0.126 in
84
Sd = 32.55 sq.in
Qes = 0.34
5 Hz 10 50 100 500 1 K 5 K 10 K 20 K
Re = 5.58 ohms
Le = 0.85 mH
Maximum Acoustic Power (dB-SPL/Hz at 1 m)
Eminence Designer
Z = 8 ohms
dB
Pe = 250 watts
124
118
112
106
100
94
88
82
5 Hz 10 50 100 500 1 K 5 K 10 K 20 K
File: Beta8CXHighPowerSealedMidRange250Watts.bb6

Page Two -- Beta8CXHighPowerSealedMidRange250Watts.bb6
Cone Displacement (mm/Hz) with 250 watts
mm
16
Eminence Designer
14
12
10
8
6
4
2
5 Hz 10 50 100 500 1 K 5 K 10 K 20 K
System Impedance (ohms/Hz)
ohms
80
Eminence Designer
70
60
50
40
30
20
10
5 Hz 10 50 100 500 1 K 5 K 10 K 20 K