BL-21994-000 Knowles Acoustics, BL-21994-000 Datasheet - Page 21

• Manufacturer Part Number: BL-21994-000
• Description: MIC ASSY PIEZO INSTR W/38" CABLE
• Manufacturer: Knowles Acoustics
• Series: BLr
• Type: Piezo Condenserr

Specifications of BL-21994-000

• Sensitivity: -69dB ±3dB
• Voltage - Rated: 3V
• Current: 160µA
• Size / Dimension: Circular - 12.7mm Dia x 25.4mm H
• Impedance: 4K Ohm
• Frequency: 20Hz ~ 10kHz
• Termination: Wire Leads
• Direction: Omnidirectional
• Port Location: Top
• Diameter: 12.7 mm
• Transducer Function: Microphone
• Device Type: Microphone
• Directivity: Omni
• External Diameter: 12.7mm
• Output Impedance: 4000ohm
• Length: 25.4mm
• Outer Diameter: 12.7mm
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Filter Type: -
• S/n Ratio: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 423-1002; BL-1994; BL-21994; BL1994

BK SERIES
BK Series speakers provide broadband performance at value pricing. They are commonly
used for full range in-ear speakers and communications utilizing an earplug design.
CM SERIES
The CM Series delivers the benefits of balanced armature technology in a compact finished
package. The CM is ideal for use in situations where a non-contacting headset is required,
but signal voltage is limited – as is common for radios and wireless telephones. The CM
also conserves battery power, and provides static shock protection for the user.
BK-21600-000
BK-21604-000
BK-21610-000
BK-21613-000
BK-21615-000
BK-21669-000
BK-23134-000
BK-26824-000
BK-28507-000
BK-28510-000
BK-28562-000
BK-29725-000
CM-23152-000
CM-23299-000
CM-28421-000
CM-28431-000
CM-28452-000
M M o o d d e e l l
M M o o d d e e l l
– Balanced Armature Speaker 7.87 x 5.59 x 4.01 (mm)
– Balanced Armature Speaker 8.38 x 16.64 DIA (mm)
Sensitivity @ 1kHz
Sensitivity @ 1kHz
(dB SPL)
(dB SPL)
123.5
123
123
121
118
118
118
119
126
126
123
118
103
103
103
103
103
•
•
•
•
•
•
•
•
•
High efficiency and low distortion
Various port locations, coil impedances, damping options,
terminal configurations, and frequency responses available
Balanced-armature, magnetic technology to give high efficiency,
stability and reliability
High acoustic efficiency enables sufficient sound output even
when limited power is available
In-built static protection
Lightweight, matt-black, plastic housing
Ergonomically designed with rounded edge to fit the concha
High-quality sound output
Tailored bandwidth for superb speech intelligibility
Port Location
Port Location
Face
Face
Face
Face
Face
12S
12S
12S
12S
12C
12S
12S
12S
12S
12S
12S
1S
www.knowles.com
Impedance @ 500Hz
Impedance @ 500Hz
SPECIALTY TRANSDUCERS – Speakers
(Ohms)
(Ohms)
2320
13.3
285
450
450
285
320
285
150
150
360
360
60
24
16
23
30
Max SPL @ 500Hz
Max SPL @ 500Hz
(dB SPL)
(dB SPL)
126.5
122.5
114.5
114.5
114.5
114.5
114.5
118
118
118
118
118
118
118
123
119
118
135
125
115
105
95
125
115
105
95
85
100
100
Max SPL @ 1st Peak
Max SPL @ 1st Peak
2
(dB SPL)
(dB SPL)
2
133
133
136
134
134
134
134
129
136
135
131
128
129
119
119
119
119
3
3
4
4
5
5
6 7 8 9
6 7 8 9
FREQUENCY (Hz)
FREQUENCY (Hz)
Note: All performance curves are typical
1k
1k
2
2
3
3
4
4
5
5
6 7 8 9
6 7 8 9
10k
10k
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