2
OPERATION OF MX1BP PREAMPLIFIER (Figure 3)
1.
With the Mic Mute/On switch in the Mute position, plug the
microphone into the preamplifier’s miniature connector.
(NOTE: The Power LED Indicator will remain lit in both the
Mute and On microphone modes.)
2.
Plug the XLR cable from the preamplifier into the respective
audio device microphone input.
3.
Switch the Mic Mute/On switch to the On position.
4.
Adjust the gain level of the audio input device, if necessary.
1
2
3
1) Mic Mute/On Switch
2) Mini Connector
3) Power LED Indicator
MUTE ON
POWER
MIC
FIGURE 3
INTERNAL HIGH-PASS FILTER
An internal high-pass filter is featured in the MX1BP. It is
jumper selectable and allows the user to alter the low frequen-
cy response of the unit. For information on how to adjust this
feature, please call (800) 488-3297 and follow the recorded di-
rections for technical data by fax. For additional technical as-
sistance, phone Shure at (847) 866-2200. In Europe, phone
49-7131-72140.
USE WITH PHANTOM POWER
The MX1BP can also be used in situations where phantom
power is available.
Phantom power may be applied with a 9 V battery in place or
removed. With the battery installed, the MX1BP will silently
and automatically switch to the battery reserve should phan-
tom power fail. Battery depletion will not occur while phantom
power is applied.
CHANGING CARTRIDGES
The MX183BP, MX184BP, and MX185BP microphone sys-
tems use interchangeable cartridges. To remove the cartridge,
unscrew it from the microphone body (see Figure 1). Install the
replacement cartridge by screwing it onto the microphone body.
SPECIFICATIONS
These specifications apply only to MX180 series micro-
phones when used with the supplied MX1BP preamplifier.
Type
Condenser (electret bias)
Frequency Response (Figure 4)
50 to 17,000 Hz
Polar Pattern (Figure 5)
MX183BP: Omnidirectional
MX184BP: Supercardioid
MX185BP: Cardioid
Polarity
Positive sound pressure on diaphragm produces positive voltage
on pin 2 relative to pin 3 of output XLR connector.
Environmental Conditions
Operating Temperature Range: -18
o
to
57
o
C (0
o
to 135
o
F)
Storage Temperature Range: -29
o
to 74
o
C (–20
o
to 165
o
F)
Microphone Cable
Shielded 1.2 m (4 ft.) cable terminated with a 4-pin female
mini connector (TA4F).
Output Impedance (at 1kHz)
EIA rated at 150
Ω (
115
Ω
actual)
Open Circuit Sensitivity (at 1 kHz, ref. 1V/pascal*)
MX183BP: –46.5 dB (4.7 mV)
MX184BP: –52.5 dB (2.4 mV)
MX185BP: –54 dB (2.0 mV)
*1 pascal = 94 dB SPL
Maximum Sound Pressure Level (1kHz at 1% THD, 1 k
Ω
load)
MX183BP: 132.8 dB
MX184BP: 138.8 dB
MX185BP: 140.3 dB
Equivalent Output Noise (A-weighted, with 1 k
Ω
load)
MX183BP: 23.7 dB SPL
MX184BP: 29.7 dB SPL
MX185BP: 31.2 dB SPL
Signal to Noise Ratio (ref. at 94 dB SPL at 1 k
Hz, with
1 k
Ω
load)
MX183BP: 70.3 dB
MX184BP: 64.3 dB
MX185BP: 62.8 dB
Dynamic Range (with 1 k
Ω
load, at 1 KHz)
109.1 dB
Common Mode Rejection
45.0 dB minimum, 10 Hz to 100 kHz
Selectable Rolloff Frequency
100 Hz, with a 12 dB per octave rolloff below this corner fre-
quency.
(Factory Setting: 25 Hz with a 6 dB per octave rolloff.)
MX1BP Net Weight
255 g (9 oz) with attached cabling.
MX1BP Dimensions (Figure 6)
84.3 mm H x 65.2 mm W x 25.7 mm D (3.32” x 2
.
57” x 1.01” )
MX1BP Cable
One 3.6 m (12 ft) 2 conductor shielded output cable with 3–pin
male XLR connector.
Power Requirements
9 V alkaline battery (Duracell
MN1604 recommended); 8.4 V
NiCd rechargeable battery or 9 V Ultralife
lithium battery option-
al; or, from phantom power source, 10 to 52 Vdc
Battery Life (nominal)
600 continuous hours with 9 V alkaline battery
Battery Current (nominal): 0.8 mA
MX1BP Input Connector Type: 4-pin Male Mini Connector
(TB4M)
MX1BP Input Configuration: Unbalanced
MX1BP Output Connector Type
3-pin Male XLR
MX1BP Output Configuration
Transformer balanced
CERTIFICATION
Eligible to bear CE Marking. Conforms to European EMC Direc-
tive 89/336/EEC. Meets applicable tests and performance crite-
ria in European Standard EN55103 (1996) parts 1 and 2, for resi-
dential (E1) and light industrial (E2) environments.
