FE87E - Madisound

Features
• ‘ES cone’ paper made of
banaba plant’s fiber
• Newly designed center cap
• Repulsion type magnet
shielded circuit
• Ferrite magnet
LOW LEAKAGE FLUX TYPE FULL RANGE
SPEAKER UNIT
FE87E
Specifications
&
Thiele/Small Parameters
Size : 80 mm / 3
Voice Coil Diameter
: 16 mm / 0.6
Cast / Stamped : Stamped
Impedance : 8 Ω
Reproduction Frequency Response
:fs -
Sound Pressure Level
:
Rated Input :
Music Power :
Magnet Material :
Magnet Weight
(main) :
(cancel) :
Net Weight
30
89
5
15
kHz
dB/W(m)
W
W
Ferrite
in
in
48.4 g / 0.107 lb
27.9 g / 0.062 lb
288 g / 0.635 lb
Frequency Response / Impedance
110
100
90
80
70
60
50
8
Impedance
(dB)
4
20 Hz 50 100 200 500 1k 2k 5k 10k 20k 40k
Ω
16
a :
D :
Sd :
Zn :
Fs :
Re :
Le :
Qms :
Qes :
Qts :
Mms :
BL :
Vas :
Xmax :
Eff/η0 :
Cms :
EBP :
30
60
0.0028
8
140
7.7
n/a
3.77
1.20
0.92
1.4
2.81
1.03
mm
mm
m 2
Ω
Hz
Ω
mH
g
Telsa/m
L
mm
%
0.40
0.22
0.0009 mm/N
116.67
Dimensions & Mounting Information
ø77.4
R43
4-4 X 6
3.8
Overall Diameter :
Baffle Hole Diameter
:
Depth :
ø70
ø53.8
ø75
83
21.6
83 mm / 3.3 in
70 mm / 2.8 in
45.6 mm / 1.8 in
45.6

RECOMMENDED ENCLOSURE
FE87E
Recommended Back Loaded Horn Type Enclosure
130
100
ø72
45
300
175
180
615
600
60
15
30
215
50
220
370
225
460
185
20
45
175
200
45 o
60 60
250
unit:mm / 15mm thick
110
100
90
80
70
60
50
(dB)
20Hz
50 100 200 500 1k 2k 5k 10k 20k
• This example shows a back loaded horn type enclosure for FE87E.
• Simple design constructed with flat panels.
• This enclosure provides rich low frequency through the horn
and mixes high/mid frequency radiated directly from the FE87E
for clarity of total sound image.
Recommended Standard Bass Reflex Type Enclosure
Example of FE87E standard bass reflex type enclosure.
Internal volume is 5 liters tuned to approximately
99Hz (Fb).
60
(170)
140
(190)
160
110
100
90
80
70
60
50
(250)
120
ø40
ø72
220
(dB)
20Hz
50 100 200 500 1k 2k 5k 10k 20k
unit:mm / capacity:5 liter / 15mm thick
47