BL-21994-000 Knowles Acoustics, BL-21994-000 Datasheet - Page 17

• 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

WBHC SERIES
The advanced design of the HC Series speaker provides extended acoustic bandwidth for
hi-fi in-ear speakers when paired with a low frequency speaker.
HC SERIES
Knowles balanced-armature, magnetic technology to give high efficiency, stability
and reliability. HC Series provides increased low frequency dynamic range in a
package size equal to FC.
FC SERIES
FC Series speakers may be used for small radio communication earphones where ED
size does meet package requirements. Rounded corners make it slightly smaller
compared to EH Series speakers.
M M o o d d e e l l
WBHC-23910-000
M M o o d d e e l l
HC-23761-000
FC-26171-000
FC-26887-000
M M o o d d e e l l
– Balanced Armature Speaker 5.18 x 3.55 x 3.00 (mm)
– Balanced Armature Speaker 5.16 x 3.51 x 3.00 (mm)
– Balanced Armature Speaker 5.16 x 3.51 x 3.00 (mm)
Sensitivity @ 1kHz
Sensitivity @ 1kHz
Sensitivity @ 1kHz
(dB SPL)
(dB SPL)
(dB SPL)
101
104
100
95
•
•
•
•
High-output technology provides double (+3dB) the maximum
acoustic output of existing Knowles FC Series speakers
Maximum output comparable to Knowles’ ED Series speaker
in a package size only 68% as large!
Same size and dimensions as Knowles’ EH Series
Ideal for applications where small size and high output is required
•
•
•
•
•
•
Available in High-Output HC speaker version
Two-terminal zero-bias and three-terminal center-tapped configurations
Undamped, screen damped, internally damped, and
Ferrofluid™ damped responses
Rounded corners for improved fit rates; 10% smaller cross-section
compared to EH speaker
Lower low/mid band sensitivity compared to HC series
Combine with low/mid-range speaker for extended
frequency response
Port Location
Port Location
Port Location
12C
12C
12C
12C
www.knowles.com
Impedance @ 500Hz
Impedance @ 500Hz
Impedance @ 500Hz
SPECIALTY TRANSDUCERS – Speakers
(Ohms)
(Ohms)
(Ohms)
130
8.4
170
425
Max SPL @ 500Hz
Max SPL @ 500Hz
Max SPL @ 500Hz
(dB SPL)
(dB SPL)
(dB SPL)
110.5
105
114
112
120
115
110
105
100
95
90
85
80
120
115
110
105
100
95
90
85
80
100
100
120
115
110
105
100
Max SPL @ 1st Peak
Max SPL @ 1st Peak
95
90
85
80
Max SPL @ 1st Peak
100
(dB SPL)
(dB SPL)
2
(dB SPL)
2
115
116
127
116
2
3
3
3
4
4
5 6 7 8 9
4
5
6 7 8 9
5 6 7 8 9
FREQUENCY (Hz)
FREQUENCY (Hz)
Note: All performance curves are typical
FREQUENCY (Hz)
100
1k
1k
2
2
2
3
3
3
4
4
4
5
5
5 6 7 8 9
6 7 8 9
6 7 8 9
10000
10k
10k
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