Engineering Data Sheet
FX20-PRO
▪ 600 W EVX 180B transducer
▪ 30–150 Hz (-10 dB)
▪ High-efficiency planar waveguide design
▪ Voice coil tracking protection
The Dynacord FX20-PRO is a planar waveguide bass
horn, equipped with the high-power Electro-Voice EVX
180B 18-inch transducer. Frequency response is 30–
150 Hz (-10 dB), so the crossover frequency to midhigh cabinets can be chosen strictly applicationoriented between 80 Hz and 140 Hz.
The cabinet is equipped with an electronic circuit
called VOICE COIL TRACKING PROTECTION. This
circuit senses the terminal voltage of the transducer
and simulates the thermal behavior of the woofer´s
voice coil. In case of potential thermal overload the
power applied to the speaker is reduced to a safe
level. Power amps up to 1200 W/8 Ω can be used in
order to have maximum dynamic range without the
danger of thermal overload in non-controlled
situations. The VOICE COIL TRACKING PROTECTION
exhibits “soft” switching characteristics, so no
annoying clicks or pops are audible. The circuitry
automatically resets after the voice coil temperature
has reached a safe value.
The FX20-PRO cabinet is made of 15-mm birch
plywood. All corner joints and braces are grooved and
glued. A powder-coated steel grille protects the
speakers. The connector panel uses two 4-pole
speakON connectors (IN/OUT) for a safe connection
and easy daisy-chaining to other cabinets. The pin
assignment is 1+/1-. Pins 2+ and 2- are also connected
between the respective two speakON connectors.
When using Dynacoard power amp racks or system
amplifiers, the whole system can be wired with 4-pole
speakON cables without any danger of accidental
wiring mistakes. The cabinet is equipped with eight
large rubber feet that allow easy stacking. Six
ergonomic handles and four heavy-duty castors on the
rear side guarantee easy and safe transport. The
surface is painted with a 2-component paint that can
easily be renovated if sometimes necessary. FIR and
IIR controller presets can be downloaded from our
website www.dynacord.com.
Parts included
Quantity
Component
1
FX20-PRO
1
Engineering data sheet
1
Important safety instructions
2 | FX20-PRO
Technical specifications
V1.
V2
V3
INPUT+
RED
V4
LO+
RED
Passive subwoofer, planar
waveguide bass horn
GREEN
D23
1N4007
D1
62k
R44
270k
51k
R43
R45
75V
D21
20V
27V
B C E
C21
XXX
XXX
EBC
R48
BC337
BC327
R49
750
R52
8k2
10k
10k
3V3
R55
10k
10k
1000µ/50V
R47
BC337 BC337
Q17 Q16
MJE340
R42
D20
D19
2k7
R50
Q15
BC337
4k3
R51
R56
D22
10k
Sound pressure level
R53
C22
10000µ/10V
1k
R54
1N4007
D18
2
1
2200µ/160V
C17
1N4007
150k
C16
2200µ/160V
R23
150k
R21
R24
100k
+1
Q14
MJE340
100
2400 W
10k
Q19
BC327
Q18
BC327
R46
• Peak power
LA1
EVX 180B
B002
BLACK
1200 W
D15
R26
RED
-2
+2
2+
1-
• Program power
E3-O
-1
600 W
10k
1-
GREEN
2-
• Rated power RMS
E3A
R10
6V2/0.5W
+2
+1
-1
YELLOW
Power handling
R25
150k
B001
2+
8Ω
Q2
MJE340
150k
R22
2-
1+
Nominal impedance
220
20W
-2
Description
D8
1N4007
BLACK
• SPL 1 W/1 m
101 dB
• Maximum SPL (1 meter)
135 dB
Circuit diagram
Frequency range (-10 dB),
measured with Xa 4000
30–150 Hz
Recommended active crossover
frequency
140 Hz, 18 dB/oct. Butterworth
Voice coil tracking protection
Yes
Transducer
EVX 180B
Audio sockets
• Model
2 ✕ NEUTRIK speakON NL4MPR
• Contacts
1+/1-
Enclosure material
Birch plywood, 15 mm
Enclosure finish
Heavy-duty structured lacquer
Color
Black (RAL 9005, jet black)
Grille
Powder coated steel
Handles
6
Castors
4
Product dimensions (Width ✕
Height ✕ Depth)
610 ✕ 905 ✕ 814 mm
Net weight
54.3 kg
Shipping weight
60.5 kg
NEUTRIK, speakON and etherCON are registered trademarks of Neutrik AG.
SPL / dB
Frequency Response, 1/6 Oct.
110
105
100
95
90
85
80
75
70
65
60
20
100
1k
f / Hz
Frequency response
GREY
INPUT-
10k
20k
LO-
FX20-Pro
3 | FX20-PRO
Dimensions
Installation/configuration notes
property. Do not suspend or mount any other
product or device from this loudspeaker en-
Warning!
closure! Use grade 5 hardware or better only!
We expressly point out that the relevant safe-
!
ty regulations must be observed for “flying”
loudspeaker systems. It is imperative that
qualified expert advice is sought.
Warning!
!
This loudspeaker system can permanently
damage hearing! Use extreme care when setting sound pressure levels!
Warning!
Consult a certified structural engineer before
!
any attempt to suspend this loudspeaker!
Loudspeaker can fall from improper suspension, resulting in severe injury and damage of
Ordering information
FX20-PRO
1 ✕ 18-inch planar waveguide bass horn; 1200 W/
600 W; 8 Ω, painted
Order number F.01U.308.089
4 | FX20-PRO
Bosch Sicherheitssysteme GmbH
Robert-Bosch-Ring 5
85630 Grasbrunn
Germany
www.dynacord.com
© Bosch Sicherheitssysteme GmbH, 2015 | Data subject to change without notice
Document Number F01U312215 | Vs1 | 28. Apr 2015