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Back Loaded Horn Enclosure
This is an example of installing FE83-Sol into the back loaded horn type enclosure. It is a
two-division structure of the body and the stand and the stand bottom sides is the horn open-
ing. Follow the assembly order, but in advance, mark the guide line with pencil on the board
#2 for the position to adhere the board #10 and #12 (lateral boards). We recommend using
generous portion of adhesive at the end face of the board #8 and #10 to fill the gap because
they are bonded to the diagonal. The internal wire will go through the Ø8 hole of board #8,
but this should be done before adhering the board #3. After assembling the main body and
the stand, place the body to the stand. For fall prevention, fix the board #15 and #17 with
either adhesive or screws. As for acoustic absorption material, we recommend inserting thin
wool inside the air compartment and attach coarse felt on the both sides of stand board #20.
Design Value
Air compartment
: 0.99 liters
Throat dimension
: 21.2 square cm
Horn opening dimension : 224 square cm
Horn length: 185 cm
Horn cross-over freq.
: 250 Hz
Cut-off freq.
: 35 Hz
Broadening coefficient : 1.14
Parts Used
Terminal
Internal wire
Board
Acoustic absorption material : wool / coarse felt x adequate dose
Assembly Drawing
Main body
130
106
12
32
83
105
12
Board Cutting Drawing
105×2
73×4
550
Assembly Sequence
Main body
A : 6 + 13
B : 4 + 13 + 13
C : (5 + 13) + 1 + 11 + 7
D : 12 + 9
E : 10 + 14 + 14
F : 2 + C + B + A
G : F + D + E + 3
H : G + (15 + 16 + 16)
: P24B x 2 sets
: SFC83 adequate length
: China plywood 910 mm x 1820 mm t12 x 1
: MDF 900 mm x 450 mm t12 x 1
260
156
72
20
97
139
12
1820
650×2
638
106×4
97 (rest)
Stand
I : 17 + 20 + 19 + 21 + 18
J : I + 22 + 22
Bottom Side of Main body
2-Ø13 hole
25
Stand
130
200
224×2
146
150
106×3
110
100
90
80
70
60
50
40
30
Impedance
20
10
[dB]
20
[Hz]
50
100
200
500
1k
Completion Drawing
Main body
Stand
Horn Opening
300
12
52
224
A
A'
450
300
106
[Ω]
128
64
32
16
8
4
2k
5k
10k
20k
50k
A-A' Cutaway
Drawing
12
12
59
59
Board Process
Dimensions
106
Ø8 hole size should fit
with the thickness of
cable used.
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