RCF BM 3804 User manual

USER MANUAL
MANUALE D’USO
BM 3804 -DXT 3000 DESK-TOP
PAGING MICROPHONE
-BASE MICROFONICA DA
TAVOLO PER SISTEMA
DXT 3000
BE 3806 -ADDITIONAL KEYBOARD
FOR BM 3804 PAGING
MICROPHONES
-TASTIERA ADDIZIONALE
PER BASE MICROFONICA
BM 3804
BM 3804FM -DXT 3000 FIREMEN’S
WALL-MOUNTED
PAGING MICROPHONE
-BM 3804 IN VERSIONE
PER VIGILI DEL FUOCO
(CON CASSETTA DA
PARETE)

TABLE OF CONTENTS
INDICE
ENGLISH
SAFETY PRECAUTIONS
DESCRIPTION
CONNECTION
BLOCK DIAGRAMS
BM 3804 – FRONT PANEL
BE 3806 ADDITIONAL KEYBOARD – FRONT PANEL
USE
BM 3804FM – FIREMEN’S PAGING MICROPHONE
SPECIFICATIONS
ITALIANO
AVVERTENZE PER LA SICUREZZA
DESCRIZIONE
COLLEGAMENTO
SCHEMI A BLOCCHI
BM 3804 – PANNELLO FRONTALE
PULSANTIERA ADDIZIONALE BE 3806 – PANNELLO FRONTALE
UTILIZZO
BM 3804FM – CONSOLE D’EMERGENZA PER VIGILI DEL FUOCO
DATI TECNICI
4
6
7
13
15
17
18
19
20
22
24
25
31
33
35
36
37
38

4
SAFETY PRECAUTIONS
IMPORTANT NOTES
IMPORTANT NOTES
Before connecting and using this paging microphone, please read this instruction
manual carefully and keep it on hand for future reference. The manual is to
be considered an integral part of this product and must accompany it when
changing ownership as a reference for correct installation and use as well as
for the safety precautions. RCF S.p.A. will not assume any responsibility for the
incorrect installation and / or use of this product.
SAFETY PRECAUTIONS
NOTE: according to EN 54-16 standard, paging microphones shall be only
accessible by personnel having a specic responsibility for safety and who are
trained and authorized to operate in the following conditions: quiescent, voice
alarm, fault warning and disablement.
1. All the precautions, in particular the safety ones, must be read with special
attention, as they provide important information.
2. Make sure all connections have been made correctly before switching all
devices on.
Do not connect / disconnect paging microphones when the system is operating.
3. Protect paging microphone cables from damage and assure they are
positioned where these cannot be stepped on or crushed by objects.
4. Do not put the paging microphone into water (or another liquid), do not
throw it.
5. Never attempt to carry out any operations, modications or repairs.
If the paging microphone does not work properly, contact your authorized service
centre.
6. Should the paging microphone emit any strange smell or even smoke, turn the
audio system off immediately and disconnect it.
7. RCF S.P.A. strongly recommends the sound system installation is only made
by professional qualied installers (or specialised rms), who can certify it
according to the regulations in force.
The entire audio system must comply with the current standards and regulations
regarding electrical systems.
8. Mechanical and electrical factors need to be considered when installing a
professional audio system (in addition to those which are strictly acoustic, such
as sound pressure, angles of coverage, frequency response, etc.).
9. Do not point the microphone at near loudspeakers,in order to avoid feedback.
ENGLISH

5
10. Hearing loss
Exposure to high sound levels can cause permanent hearing loss. The acoustic
pressure level that leads to hearing loss is different from person to person and
depends on the duration of exposure.
To prevent potentially dangerous exposure to high levels of acoustic pressure,
anyone who is exposed to these levels should use adequate protection devices.
When a transducer capable of producing high sound levels is being used, it is
necessary to wear ear plugs or protective earphones.
11. To prevent inductive effects from causing hum, noise and a bad system
operating, paging microphone cables should not be laid together with other
electric cables (mains) and loudspeaker lines.
12. Keep the paging microphone far from any excessive heat source.
13. Do not use solvents, alcohol, benzene or other volatile substances for
cleaning the external parts. Just use a dry cloth.
ENGLISH

6
RCF S.P.A. THANKS YOU FOR PURCHASING THIS PRODUCT, WHICH
HAS BEEN DESIGNED TO GUARANTEE RELIABILITY AND HIGH
PERFORMANCES.
DESCRIPTION
BM 3804 is a desktop paging microphone exclusively dedicated for the RCF
DXT 3000 system.
It can be directly connected to the MX 3250 / MX 3500 main unit through a
four-pair J-type re-rated cable.
Up to four BM 3804 paging microphones (interlocked one another) can be
linked (daisy-chained) to the line.
BM 3804 front panel includes the following buttons:
- Two for zone selecTion (firsT and second only)
- PTT (‘Push ToTalk’)
- Gen call (sysTem General call)
- chime (on / off)
- eVac messaGe selecTion
- alerT messaGe selecTion, This buTTon also allows To muTe The buzzer (when afaulT
is deTecTed)
- a ProTecTed bisTable emerGency buTTon (wiTh red liGhT) To sTarT PlayinG The
eVacuaTion / alerT messaGe in all zones.
The system status is indicated by a LED bar.
Every BM 3804 paging microphone can be expanded with an additional
BE 3806 keyboard, which has six buttons for the six-zone selection of a
complete MX 3250 / MX 3500 main unit (with three amplier boards).
If the main unit only has two or four zones, the unused zone buttons of the
BE 3806 keyboard can be removed and its label (with silkscreen) can be
replaced.
If the DXT 3000 system is made up of several MX 3250 / MX 3500 main units
(up to max. eight: a ‘master’ unit plus seven ‘slave’ units) linked one another
through IE 3008 ‘Interlink’ boards, it is possible to add up to eight BE 3806
keyboards (one for each main unit to be controlled) to each BM 3804 paging
microphone.
The rst BM 3804 paging microphone (of the line) is for emergency purpose
and directly powered by the MX 3250 / MX 3500 main unit, while the second,
the third and the fourth need 24 V dc adapters (500 mA, i.e. RCFAC AD 2405,
optional).
Other features:
- casinG in die-casT meTal
- PreamPlified cardioid hi-qualiTy microPhone, wiTh flexible 445 mm lonG
- comPrehensiVe self-diaGnosTics (en 54-16)
- connecTion cable included (5 m, wiTh rJ 45).
IMPORTANT NOTE:
As the rst paging microphone is for emergency purposes, this
shall be placed in premises with access restricted to authorized
personnel only.
ENGLISH

7
CONNECTION
INPUT : RJ 45 port to be linked to either the MX 3250 / MX 3500
main unit PAGING IN or the previous BM 3804 paging microphone
OUTPUT.
OUTPUT : RJ 45 port to be linked to the next BM 3804 paging
microphone INPUT.
BM 3804 – REAR PANEL
INPUT POWER SUPPLY
INPUT
OUTPUT
PIN INPUT PIN OUTPUT
1 Audio signal (+, hot) 1 Audio signal (+, hot)
2 Audio signal (–, cold) 2 Audio signal (–, cold)
3 Power supply 3 (not used)
4 Ground 4 Ground
5 Ground 5 Ground
6 Ground 6 (not used)
7 RS 485 A (+) 7 RS 485 A (+)
8 RS 485 B (–) 8 RS 485 B (–)
8 46 2
7 35 1
RJ 45 PLUG
RJ 45 SOCKET
|1|2|3|4|5|6|7|8|
BM 3804FM is the ‘Firemen’ paging microphone that works in the same way
of the BM 3804 model, but with the following differences:
- The PaGinG microPhone is inside awall-mounTed meTallic box
(colour: red, ral 3000) wiTh Glass.
- a handheld microPhone wiTh momenTary swiTch
(insTead of aGooseneck mic.).
- The handheld microPhone momenTary swiTch has The same funcTion of The PTT
buTTon
3
.
ENGLISH

8
CABLE TO LINK THE FIRST BM 3804 PAGING MIC.
TO THE MX 3250 / MX 3500 MAIN UNIT
B
A
G
+V
–
+
POWER SUPPLY
AUDIO SIGNAL
RS 485
GROUND
Brown
Brown/White
Green
Blue/White
Blue
Green/White
Orange
Orange/White
Brown
Brown/White
Green
Blue/White
Blue
Green/White
Orange
Orange/White
12345678
RJ
PIN DESCRIPTION CAT 5e WIRE COLOUR CJ 428e WIRE COLOUR
1 Audio signal (+, hot) Orange/White Red
2 Audio signal (–, cold) Orange Blue
3 Power supply Green/White Yellow
4 Ground Blue Brown
5 Ground Blue/White Green
6 Ground Green Grey
7 RS 485 A (+) Brown/White White
8 RS 485 B (–) Brown Black
CORRESPONDENCE OF WIRES BETWEEN CAT 5E AND CJ 428E CABLES
POWER SUPPLY INPUT: input for the external 24 V dc adapter (500 mA,
i.e. optional RCF AC AD 2405), not included; remove the cable guide by
unscrewing its screw.
Notes:
- The firsT bm 3804 PaGinG microPhone is direcTly Powered by The mx 3250 /
mx 3500 main uniT (The exTernal ac ad2405 adaPTer is noT necessary).
iTs cable musT noT be lonGer Than 800 m (use rcf cJ 428e cable).
- The second, The Third and The fourTh bm 3804 need an ac ad2405 adaPTer
(noT included). The sum of all cables musT noT be lonGer Than 800 m
(use rcf cJ 428e cable).
BM 3804 – INTERNAL DIP-SWITCH SETTINGS
WARNING: the INteRNAl dIp-sWItch settING shAll be cARRIed out oNly by eItheR
RcF oR AN AuthoRIsed seRvIce ceNtRe.
Note: ANy settING chANGe shAll be cARRIed out WheN the system Is sWItched oFF
(oR the pAGING mIcRophoNe Is dIscoNNected).
On the BM 3804 rear side, remove the central blank panel to access the six
dip-switches.
ENGLISH

9
DIP-SWITCH FUNCTION NOTES
1 ID (0) Digital address setting (see the next table).
2 ID (1) Digital address setting (see the next table).
3 ID (2) Not used; leave it OFF.
4 EMERGENCY
This applies to the rst paging microphone only.
If set to ON, the paging microphone can be used to start playing either the
evacuation (EVAC button 13 ) or the alert message (ALERT button 7).
If set to OFF, emergency functions are disabled.
5 TEST Service / maintenance function: leave it OFF.
6 --- Not used; leave it OFF.
DIP 1 DIP 2 DIGITAL ADDRESS NOTES
off off 0 First BM 3804
ON off 1 Second BM 3804
off ON 2 Third BM 3804
ON ON 3 Fourth BM 3804
Note: afTer seTTinG diGiTal addresses ProPerly and rebooTinG The sysTem, iT will be
necessary To selecT (in The mx 3250 / mx 3500 main uniT) The dIscoveRy funcTion
(auTomaTic deTecTion of all PaGinG microPhones linked To The sysTem).
BE 3806 ADDITIONAL KEYBOARDS
If the DXT 3000 system only has a single
MX 3250 / MX 3500 main unit, each
BM 3804 paging microphone can be
expanded with only one BE 3806 additional
keyboard having six buttons, which can be
used to select each single zone (1 to 6, if
available). AC AD2405
BM 3804 BE 3806
4
Notes:
- The firsT bm 3804 PaGinG microPhone is direcTly Powered by The mx 3250 /
mx 3500 main uniT (The exTernal ac ad2405 adaPTer is noT necessary). iTs cable
musT noT be lonGer Than 800 m(use rcf cJ 428e cable).
- The second, The Third and The fourTh bm 3804 need an ac ad2405 adaPTer (noT
included). The sum of all cables musT noT be lonGer Than 800 m
(use rcf cJ 428e cable).
ENGLISH

10
ENGLISH
- ifThe main uniT only has Two or four zones, The unused zone
buTTons of The be 3806 keyboard can be remoVed and iTs label
(wiTh silkscreen) can be rePlaced. Two addiTional labels are
included (for eiTher four or Two zones). The keyboard is iniTially
imPlemenTed wiTh The six-zone label.
A
B
C
D
LABELS FOR 6, 4, 2 ZONES
RED
BM 3804 BE 3806
4
BM
3804
BE
3806
Link the BE 3806 additional keyboard to the BM 3804
paging microphone through its flat-cable connected to
the two rear ports.
Pay attention to the flat cable right way, indicated by its
red wire (see the next figure).
Looking at its rear side, remove both the BE 3806 right
blank panel and the BM 3804 left blank panel.

11
Fix the BE 3806 additional keyboard to the BM 3804
paging microphone by using the dedicated plate (included
in the BE 3806 package) and four screws.
BM
3804
BE
3806
If the DXT 3000 system is made up of several MX 3250 / MX 3500 main units
(up to max. eight: a ‘master’ unit plus seven ‘slave’ units) linked one another
through IE 3008 ‘Interlink’ boards, it is possible to add up to eight BE 3806
keyboards (one for each main unit to be controlled) to each BM 3804 paging
microphone.
Each BE 3806 button allows to select only a single zone of the controlled
MX 3250 / MX 3500 main unit. Zone groups cannot be created.
In this case, each BE 3806 keyboard must be set to an unique and correct
digital address, which depends on the number of the MX 3250 / MX 3500
main unit that needs to be controlled.
Looking at the rear side of a BE 3806 keyboard, remove its central blank panel
and set the digital address from 0 (the rst main unit) to 7 (the last main unit)
by rotating its selector.
BE
3806
BE 3806BE 3806 BE 3806BE 3806 BE 3806BE 3806 BE 3806 BE 3806
AC AD2405
BM 3804
41 2 3 4 5 6 7 8
ENGLISH

12
MX 3250
MX 3500
number
BE 3806
digital
address
MX 3250
MX 3500
number
BE 3806
digital
address
1 (master) 0 5 4
2 1 6 5
3 2 7 6
4 3 8 7
Note: ANy settING chANGe shAll be cARRIed out WheN the system Is sWItched oFF
(oR WheN the RespectIve pAGING mIcRophoNe Is dIscoNNected).
iTis noT sTricTly necessary To add many addiTional be 3806 keyboards
(To abm 3804 PaGinG microPhone) if iT is noT required To conTrol all The PresenT
mx 3250 / mx 3500 main uniTs.
for insTance, aPaGinG microPhone can be PredisPosed To conTrol The main uniTs no.1,
no.3 and no. 6 only (by usinG Three be 3806 keyboards, resPecTiVely wiTh diGiTal
addresses 0, 2 and 5).
all The addresses from 8 To f are noT used.
Link all BE 3806 additional keyboards one another through at-cables
connected to the rear ports (in the same way as the link to the BM 3804
paging microphone).
Pay attention to the at cable right way, indicated by its red wire
(see the next gures).
RED RED
BM 3804 BE 3806 BE 3806
4
BE
3806
BE
3806
BM
3804
ENGLISH

13
Up to four BM 3804 paging microphones (with or without BE 3806 additional
keyboards) can be linked (daisy-chained) to the line connected to the BM380x
input of the MX 3250 / MX 3500 main unit.
BM 3804 paging microphones are interlocked one another.
The second, the third and the fourth BM 3804 need an AC AD2405 adapter
(not included).
The sum of all cables must not be longer than 800 m (use RCF CJ 428E cable).
BLOCK DIAGRAMS
SYSTEM WITH A SINGLE MX 3250 / MX 3500 MAIN UNIT
IN
BM380x IN
OUT
IN
OUT
IN
OUT
IN
MX 3250
MX 3500
AC AD2405
BM 3804 BE 3806
4
AC AD2405
BM 3804 BE 3806
4
AC AD2405
BM 3804 BE 3806
4
BM 3804 BE 3806
41234
ENGLISH

14
MX 3250
MX 3500
INTERLINK
IE 3008
1 (MASTER)
MX 3250
MX 3500
INTERLINK
IE 3008
2
MX 3250
MX 3500
INTERLINK
IE 3008
3
MX 3250
MX 3500
INTERLINK
IE 3008
4
OUT OUT
MAX. 8 BE 3806
12 3 n° (…8)
IN
AC AD2405
BM 3804
4
MAX. 8 BE 3806
12 3 n° (…8)
IN
BM 3804
4
SYSTEM WITH SEVERAL (MAX. 8) MX 3250 / MX 3500 MAIN UNITS
Up to four BM 3804 paging microphones (with BE 3806 additional keyboards)
can be linked (daisy-chained) to the line connected to the IE 3008 ‘Interlink’
board input of the rst MX 3250 / MX 3500 main unit.
BM 3804 paging microphones are interlocked one another.
MAX.4 BM 3804
ENGLISH

15
BM 3804 – FRONT PANEL
1CHIME button: push to toggle on/off the chime
(sent before an announcement).
2CHIME LED (green): when lit, the chime
(sent before an announcement) is enabled.
Push its respective button 1to toggle on/off.
3PTT (‘PushTo Talk’) button: push and hold down to turn
the microphone on and page the zones previously selected.
4PTT LED (green): when lit, the microphone is turned on
(by pushing the PTT button 3).
5GEN CALL (system general call) button: push to select
all system zones (push again to cancel).
6GEN CALL LED LED (green): when lit, it indicates the
system general call selection (by pushing the GEN CALL
button
5
).
7ALERT / SILENCE button
ALERT function (first paging microphone only): push
to select (push again to cancel) the alert status.
The respective message will be sent to the selected zones as
soon as the emergency button 15 is pressed.
Examples: Push in sequence ZONE A
9
, ALERT
7
and the emergency
button
15
to send the alert message to the rst zone only.
Push in sequence GEN CALL
5
,ALERT
7
and the emergency button
15
to
send the alert message to all system zones. When the alert message playback
is in progress, the ALERT / SILENCE button (if pushed once) allows to mute it
(but without stopping it), then push it again to unmute.
The eVacuaTion messaGe (selecTable by The eVac buTTon
13
) has PrioriTy oVer The
alerT messaGe.
SILENCE function: when a local fault has been detected, push it to mute the
buzzer.
8a ALERT LED (green): when lit, it indicates the alert status.
8b SILENCE LED (white): it ashes when a fault is detected.
9ZONE A button: push to select the system rst zone (push again to cancel).
BM
CHIME
EVAC
ALERT / SILENCE ZONE A ZONE B
BM
PTT GEN
CALL
1 3 5
13
7 9 11
16
19
17
20
18
21
2
14
4 6
15
8a
8b 10b10a 12a
12b
ENGLISH

16
10a ZONE A LED LED (green): when lit, it indicates the selection of the rst
system zone.
10b ZONE A LED (yellow / red):
- when liT yellow, The firsT sysTem zone is busy
- when liT red, The eVacuaTion / alerT messaGe is currenTly senT To The firsT sysTem zone.
11 ZONE B button: push to select the system second zone (push again
to cancel).
12a ZONE B LED (green): when lit, it indicates the selection of the second
system zone.
12b ZONE B LED (yellow / red):
- when liT yellow, The second sysTem zone is busy
- when liT red, The eVacuaTion / alerT messaGe is currenTly senT To The second sysTem zone.
13 EVAC button (first paging microphone only): push to select (push again
to cancel) the evacuation status. The respective message will be sent to the
selected zones as soon as the emergency button 15 is pressed.
Examples: Push in sequence ZONE A 9, EVAC 13 and the emergency button
15 to send the evacuation message to the rst system zone only. Push in
sequence GEN CALL 5, EVAC 13 and the emergency button 15 to send
the evacuation message to all system zones.
When the evacuation message playback is in progress, the EVAC button
(if pushed once) allows to mute it (but without stopping it), then push it
again to unmute.
The eVacuaTion messaGe has PrioriTy oVer The alerT messaGe.
14 LED EVAC (red): when lit, it indicates the evacuation status.
15 Protected bistable emergency button (with red light) that is working only
in the rst paging microphone having the emergency function enabled.
If pressed, after a few seconds, the evacuation / alert message playback starts
(choose rst zones and the message by pushing either the EVAC
13
or the
ALERT
7
button).
16 ÷ 21 LEDs
No. SILK SCREEN COLOUR INDICATION (WHEN LIT)
16
POWER green The paging microphone is properly powered and operating.
17
L/FLT yellow Detected fault in the paging microphone.
18
G/FLT yellow One or more faults are detected in the system.
19
EVAC red Evacuation message playback is in progress.
20
ALERT red Alert message playback is in progress.
21
BUSY yellow The line is engaged.
ENGLISH

17
BE 3806 ADDITIONAL KEYBOARD – FRONT PANEL
22
Zone button: push to select the respective (A-F) zone of the only
(or unique) controlled MX 3250 / MX 3500 main unit (push again to
cancel).
23
LED (green): when lit, it indicates the selection of the respective
zone (A-F, matched to the button).
24
LED (yellow / red): when is lit yellow, the respective (A-F) zone is
busy; when is lit red, the evacuation / alert message is currently sent to
the respective (A-F) zone.
25
GEN CALL button: push to select all zones of the only
(or unique) controlled MX 3250 / MX 3500 main unit (push again to
cancel).
26
LED (green): when lit, it indicates the selection of all zones of
the only (or unique) controlled MX 3250 / MX 3500 main unit.
27
LED (yellow / red): when is lit yellow, all zones of the only
(or unique) controlled MX 3250 / MX 3500 main unit are busy; when is
lit red, the evacuation / alert message is currently played.
A
23
24
22
B
23
24
22
C
23
24
22
D
23
24
22
E
23
24
22
F
23
24
22
GEN
CALL
26
27
25
ENGLISH

18
USE
Before using the paging microphone, choose to enable / disable the chime by
pushing the CHIME button
1
.
SELECTIVE OR GENERAL CALLS
1. Make sure the line has not been already engaged
(zone LEDs lit yellow or red
10b 12b 24
).
2. Select one or more zones by pushing their respective buttons of either
the BM 3804 paging microphone
9 11
or its BE 3806 keyboards (if
present)
22
.
The corresponding LEDs
10b 12a
/
23
turn green.
A further press of a button unchecks its respective zone.
To make a general call to one only or more MX 3250 / MX 3500 main
units, push one or more GEN CALL buttons
25
of the respective BE 3806
keyboards (all LEDs
26
light up).
Push the BM 3804 GEN CALL button
5
(instead) to make a system
general call (the corresponding LED
6
lights up).
3. Press and hold the PTT button
3
to turn the microphone on
(the PTT LED
4
lights up).
4. After the end of the announcement, release the PTT button PTT
3
.
The emerGency funcTion of The bm 3804 PaGinG microPhone musT be enabled
(inTernal diP-swiTch no.4 seT To on).
1. Select each single zone or push the GEN CALL button
5
for all system
zones (or one or more GEN CALL
25
buttons of the BE 3806 keyboards).
2. Select either the evacuation (by pushing the EVAC button
13
) or the alert
status (ALERT button 7 ).
3. Lift the guard and push the emergency red button
15
, after a few seconds
the selected message playback starts (all zone LEDs are lit red
10b 12b 24
).
4. To stop the message playback, deactivate (following this order):
a) All zone buttons or the GEN CALL buttons previously activated.
b) Then either the EVAC or ALERT button.
c) Finally, release the emergency red button and close its guard.
ENGLISH
ACTIVATION OF THE EVACUATION / ALERT STATUS
AND PLAYBACK OF THE RESPECTIVE MESSAGE

19
PTT
BM 3804FM – FIREMEN’S PAGING MICROPHONE
BM 3804FM is the ‘Firemen’ paging microphone that works
in the same way of the BM 3804 model, but with the following
differences:
- The PaGinG microPhone is inside awall-mounTed meTallic box
(colour: red, ral 3000) wiTh Glass.
- a handheld microPhone wiTh momenTary swiTch
(insTead of aGooseneck mic.).
- The handheld microPhone momenTary swiTch has The same funcTion of
The PTT buTTon
3
.
The remen’s microphone needs the emergency function.
It shall be connected as rst of the line and placed in a
room with access restricted to authorized personnel only.
BM 3804FM shall be placed in a closed environment, within
a protected area not subjected to conditions that may affect its
operation, for example: moisture, salt, water inltration, extreme
temperatures, shocks, etc. .
It should be placed at a height from the oor that makes it easily
accessible.
Also check the suitability of the wall and the components used
for attachment (wall plugs, screws, not supplied by RCF), which
must guarantee the system security over time, also considering,
for example, the mechanical vibrations normally generated by
transducers.
eVen The model bm 3804fm for firemen can be imPlemenTed by an
addiTional be 3806 keyboard.
This requesT shall be indicaTed in adVance in The order or The modificaTion
shall be carried ouT laTer by auThorized rcf Personnel only.
BM 3804FM
ENGLISH

20
SPECIFICATIONS
BM 3804
Microphone type:
Polar patter:
Output impedance:
Microphone sensitivity:
Frequency response:
Power supply:
Dimensions:
Gooseneck length:
Net weight:
BE 3806
Power supply:
Dimensions:
Net weight:
BM 3804FM
Microphone type:
Polar patter:
Output impedance:
Microphone sensitivity:
Frequency response:
Power supply:
Box dimensions:
Net weight:
electret
cardioid
470 Ω (1 kHz)
– 65 dB ± 3 dB (0 dB=1V/μbar, 1 kHz)
50 Hz ÷ 18 kHz (– 3 dB)
24 V dc
(either MX 3250 or MX 3500 or external
adapter RCF AC AD2405)
128 x 39 x 203 mm (without gooseneck)
445.5 mm
1.2 kg (2.7 lbs)
though the BM 3804 paging microphone
78 mm x 39 mm x 203 mm
0.7 kg (1.6 lbs)
dynamic
omnidirectional
500 Ω ± 30% (1 kHz)
– 70 dB ± 3 dB (0 dB=1V/μbar, 1 kHz)
300 Hz ÷ 6 kHz (– 3 dB)
24 V dc (MX 3250 / MX 3500)
360 x 360 x 129 mm
6.9 kg (15.2 lbs)
ENGLISH