Eminence Alpha 4-8 Manual

Alpha 4-8 Eight Driver Sealed Column-Array Design
By Jerry McNutt, Eminence Speaker LLC
440 watts, F3 at 143 Hz.
Run 4" woofers 200Hz-5.0kHz and add a CD tweeter for PA or DJ use.
Box Properties
--Description--
Name:
Type: Closed Box
Shape: Prism, square
--Box Parameters--
Vb = 0.534 cu.ft
V(total) = 0.58 cu.ft
Qtc = 0.905
QL = 20
F3 = 143.8 Hz
Fill = normal
Driver Properties
--Description--
Name: Alpha 4-8
Type: Standard one-way driver
Company: Eminence Speaker LLC
Comment: 4" woofer/midrange
--Configuration--
No. of Drivers = 8
Mounting = Standard
Wiring = Series-Parallel
Drivers sum coherently = Yes
--Mechanical Parameters--
Fs = 123.1 Hz
Qms = 6.83
Vas = 1.94 liters [15.52]
Cms = 0.42 mm/N [0.0525]
Mms = 3.96 g [31.68]
Rms = 0.45 kg/s [3.6]
Xmax = 2.6 mm
Xmech = 4.5 mm
P-Dia = 85.21 mm [241]
Sd = 57.72 sq.cm [461.8]
P-Vd = 0.0148 liters [0.119]
--Electrical Parameters--
Qes = 0.84
Re = 6.73 ohms [3.365]
Le = 0.28 mH [0.14]
Z = 8 ohms [4]
BL = 4.94 Tm [9.905]
Pe = 55 watts [440]
--Electromech. Parameters--
Qts = 0.75
no = 0.415 % [3.319]
1-W SPL = 88.33 dB [97.36]
2.83-V SPL = 89.08 dB [101.1]
File: Alpha4-8EightDriverColumnSealed440Watts.bb6
Run 4" woofers 200 Hz and up for speech.
--External Dimensions--
A = 44.34 in
B = 6.855 in
C = 5.869 in
--Internal Dimensions--
A = 42.84 in
B = 5.355 in
C = 4.369 in
--Wall Thickness--
A
Front = 0.75 in
Side = 0.75 in
C
B