BL-21994-000 Knowles Acoustics, BL-21994-000 Datasheet - Page 19

• 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

FED SERIES
The addition of Ferrofluid
survival and provides peak damping to smooth frequency response.
ED SERIES
One of Knowles’ most versatile and most popular speakers, its compact size and appreciable
output power make the ED speaker suitable for a variety of instruments.
M M o o d d e e l l
FED-26792-I04
FED-30048-I04
M M o o d d e e l l
ED-21744-000
ED-21913-000
ED-23147-000
ED-23619-000
ED-23801-000
ED-23814-000
ED-26245-000
ED-26598-000
ED-26821-000
ED-27045-000
ED-27230-000
ED-27304-000
ED-29689-000
– Balanced Armature Speaker 6.32 x 4.31 x 2.97 (mm)
– Balanced Armature Speaker 6.32 x 4.31 x 2.47 (mm)
Sensitivity @ 1kHz
Sensitivity @ 1kHz
™
(dB SPL)
(dB SPL)
to Knowles ED series speakers improves mechanical shock
102.5
102.5
102.5
102.5
102
104
104
104
104
104
104
104
104
104
104
•
•
•
•
•
•
•
Ferrofluid
Superior shock performance and reduced speaker vibration
Two-terminal zero-bias and three-terminal center-tapped configurations
Numerous port locations and coil impedances
Undamped, screen damped, internally damped, and Ferrofluid
damped responses
Numerous port locations and coil impedances
High efficiency and low distortion
™
damped with 2dB, 4dB, or 6dB peak amplitude
Port Location
Port Location
12N
12C
12C
12C
12C
12C
12S
12S
12C
12C
12C
12C
12C
12C
9C
www.knowles.com
Impedance @ 500Hz
Impedance @ 500Hz
SPECIALTY TRANSDUCERS – Speakers
(Ohms)
(Ohms)
1700
780
196
395
395
290
7.1
7.1
7.1
65
26
48
50
55
79
Max SPL @ 500Hz
Max SPL @ 500Hz
™
(dB SPL)
(dB SPL)
114.5
111.5
111.5
112.2
115.5
111.5
112
110
112
112
112
116
112
112
112
120
115
110
105
100
95
90
85
80
75
70
125
115
105
95
85
100
100
Max SPL @ 1st Peak
Max SPL @ 1st Peak
(dB SPL)
(dB SPL)
2
2
116.5
120.5
115.5
120.5
116
123
127
127
122
128
122
127
127
127
127
3
3
4
4
5 6 7 8 9
5
6 7 8 9
Note: All performance curves are typical
FREQUENCY (Hz)
FREQUENCY (Hz)
1k
1k
2
2
3
3
4
4
5
5
6 7 8 9
6 7 8 9
10k
10k
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