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Speciality Microphones

The BU Series piezo-ceramic accelerometer has output from 20 Hz to above 10 kHz, and is used primarily as a contact microphone for high noise environments. It may also be used as an accelerometer with lightweight structures. As a contact microphone, the BU may be worn on the throat, or touching a bony part of the head (top, temple, or mastoid bone). BU has been integrated into helmet designs for radio communication for military and emergency services.

Name	Description	Diameter / length [mm]	Width [mm]	Thickness [mm]	Directivity	Impedance [Ohm]	Nominal Voltage [V]	Sensitivity @ 1kHz [dBV re. 1V/Pa]	Sensitivity Tolerance [± dB]	SNR [dB]	AOP [dB]	Connection	Product status
TO-24609-B26	EC ST microphone	3.569	3.569	1.30	Omnidirectional	4400	1.6	-36	3	94	120	3-Wire	Active
TO-30034-000	EC ST microphone	7.65	3.58	2.62	Omnidirectional	3750	1.6	-34	3	65.5	118	3-Wire	Preferred
TO-30994-000	EC ST microphone	3.569	3.569	1.30	Omnidirectional	3750	1.6	-34	3	94	118	3-Wire	Active
NR-25994-D63	EC ST microphone	5.56	3.99	1.12	Bi-directional	2000	10	-35	3	94	119	3-Wire	Active
NR-30572-000	EC ST microphone	5.56	3.99	1.12	Bi-directional	4400	10	-32	3	94	116	3-Wire	Active
WP-23501-000	EC ST microphone	5.56	3.99	2.21	Bi-directional	2500	10	-34	3	94	118	2-Wire	Preferred
WP-23502-000	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-32	3	94	116	3-Wire	Preferred
WP-23502-P16	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-32	3	94	116	3-Wire	Preferred
WP-25993-D63	EC ST microphone	5.56	3.99	2.21	Bi-directional	2000	10	-35	3	94	119	3-Wire	Preferred
WP-30113-P03	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-54	3	54	138	3-Wire	Active
VFG-30747-000	EC ST microphone	3	-	3.70	Omnidirectional	4440	3	-35	3	94	119	3-Wire	Active
MR-23151-000	EC ST microphone	22.12	-	9.3	Omnidirectional	300	-	-67	3	94	151	2-Wire	Preferred
NR-23158-000	EC ST microphone	5.56	3.99	1.12	Bi-directional	4400	10	-29	3	94	113	3-Wire	Active
NR-23159-000	EC ST microphone	5.56	3.99	1.12	Bi-directional	2500	10	-45	3	94	129	2-Wire	Active
NR-23160-000	EC ST microphone	5.56	3.99	1.12	Bi-directional	2500	10	-32	3	94	116	2-Wire	Active
NR-25994-C97	EC ST microphone	5.56	3.99	1.12	Bi-directional	4400	5	-27	3	94	111	3-Wire	Active
FG45-32491-000	EC ST microphone	2.565	-	2.55	Omnidirectional	22000	10	-38	3	54	122	3-Wire	Active
FG-23742-D65	EC ST microphone	2.565	-	2.54	Omnidirectional	4400	3	-43	3	58	127	3-Wire	Preferred
FG38-30490-C36	EC ST microphone	2.565	-	2.54	Omnidirectional	4400	1.6	-31	3	66	115	3-Wire	Active
FG-23329-D65	EC ST microphone	2.565	-	2.54	Omnidirectional	4400	3	-33	3	64	117	3-Wire	Preferred
FG-23329-P142	EC ST microphone	2.565	-	2.54	Omnidirectional	4400	3	-34	3	64	118	3-Wire	Preferred
EM-24446-C36	EC ST microphone	3.569	3.569	2.21	Omnidirectional	4400	1.6	-32	3	66	116	3-Wire	Active
EM-26334-C53	EC ST microphone	3.569	3.569	2.21	Omnidirectional	4400	1.6	-32	3	66	116	3-Wire	Active
EM-23446-C36	EC ST microphone	3.569	3.569	2.21	Omnidirectional	4400	1.6	-36	3	66	120	3-Wire	Preferred
DFG-30445-000	EC ST microphone	2.69	-	2.56	uni-directional	1700	3	-49	3	44	133	3-Wire	Preferred
EA-21842-C36	EC ST microphone	5.56	3.99	2.21	Omnidirectional	3500	10	-39	3	94	123	3-Wire	Preferred
EK-23024-C36	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-33	3	68	117	3-Wire	Active
EK-23028-C36	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-37	3	63	121	3-Wire	Active
EK-23132-C36	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-33	3	68	117	3-Wire	Active
EK-23133-000	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-33	3	68	117	3-Wire	Active
EK-26899-P03	EC ST microphone	5.56	3.99	2.18	Omnidirectional	-	10	-51	3	54	135	3-Wire	Active
EK-26899-P58	EC ST microphone	5.56	3.99	2.18	Omnidirectional	-	10	-51	3	54	135	3-Wire	Active
BTM-26901-B01	EC ST microphone	7.24	3.57	1.70	Omnidirectional / Directional	5200	1.3	-35.5	3	65	120	3-Wire	Active
WP-25393-000	EC ST microphone	5.56	3.99	2.21	Bi-directional	4400	1.3	-41.5	3	94	126	3-Wire	Preferred
WP-30113-P132	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-54	3	54	138	3 Wire + Ground	Active
EM-30081-P133	EC ST microphone	3.569	3.569	2.21	Omnidirectional	4400	1.3	-48	3	94	132	3-Wire	Active
FG38-31011-S16	EC ST microphone	2.565	-	2.54	Omnidirectional	4400	1.6	-31	3	66	115	3-Wire	Active
EM-24346-D65	EC ST microphone	3.569	3.569	2.21	Omnidirectional	4400	1.3	-32	3	94	116	3-Wire	Active
EM-24446-G10	EC ST microphone	3.569	3.569	2.21	Omnidirectional	4400	1.6	-32	3	94	116	3-Wire	Active
BFG-30035-G22	EC ST microphone	2.565	-	2.54	Omnidirectional	5200	1.3	-34	3	65.5	118	3-Wire	Preferred
BJ-21590-000	EC ST microphone	7.87	5.59	4.01	Omnidirectional	3900	-	-55.5	3	NA	140	2-Wire	Preferred
BJ-21591-000	EC ST microphone	7.87	5.59	4.01	Omnidirectional	3900	-	-55.5	3	NA	140	2-Wire	Preferred
BJ-23141-134	EC ST microphone	7.87	5.59	4.01	Omnidirectional	300	-	-67.5	3	NA	152	2-Wire	Preferred
BJ-28471-000	EC ST microphone	7.87	5.59	4.01	Noise Cancelling	150	-	-70	3	NA	154	2-Wire	Active

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Speciality Microphones

The BU Series piezo-ceramic accelerometer has output from 20 Hz to above 10 kHz, and is used primarily as a contact microphone for high noise environments. It may also be used as an accelerometer with lightweight structures. As a contact microphone, the BU may be worn on the throat, or touching a bony part of the head (top, temple, or mastoid bone). BU has been integrated into helmet designs for radio communication for military and emergency services.

Name	Description	Diameter / length [mm]	Width [mm]	Thickness [mm]	Directivity	Impedance [Ohm]	Nominal Voltage [V]	Sensitivity @ 1kHz [dBV re. 1V/Pa]	Sensitivity Tolerance [± dB]	SNR [dB]	AOP [dB]	Connection	Product status
TO-24609-B26	EC ST microphone	3.569	3.569	1.30	Omnidirectional	4400	1.6	-36	3	94	120	3-Wire	Active
TO-30034-000	EC ST microphone	7.65	3.58	2.62	Omnidirectional	3750	1.6	-34	3	65.5	118	3-Wire	Preferred
TO-30994-000	EC ST microphone	3.569	3.569	1.30	Omnidirectional	3750	1.6	-34	3	94	118	3-Wire	Active
NR-25994-D63	EC ST microphone	5.56	3.99	1.12	Bi-directional	2000	10	-35	3	94	119	3-Wire	Active
NR-30572-000	EC ST microphone	5.56	3.99	1.12	Bi-directional	4400	10	-32	3	94	116	3-Wire	Active
WP-23501-000	EC ST microphone	5.56	3.99	2.21	Bi-directional	2500	10	-34	3	94	118	2-Wire	Preferred
WP-23502-000	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-32	3	94	116	3-Wire	Preferred
WP-23502-P16	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-32	3	94	116	3-Wire	Preferred
WP-25993-D63	EC ST microphone	5.56	3.99	2.21	Bi-directional	2000	10	-35	3	94	119	3-Wire	Preferred
WP-30113-P03	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-54	3	54	138	3-Wire	Active
VFG-30747-000	EC ST microphone	3	-	3.70	Omnidirectional	4440	3	-35	3	94	119	3-Wire	Active
MR-23151-000	EC ST microphone	22.12	-	9.3	Omnidirectional	300	-	-67	3	94	151	2-Wire	Preferred
NR-23158-000	EC ST microphone	5.56	3.99	1.12	Bi-directional	4400	10	-29	3	94	113	3-Wire	Active
NR-23159-000	EC ST microphone	5.56	3.99	1.12	Bi-directional	2500	10	-45	3	94	129	2-Wire	Active
NR-23160-000	EC ST microphone	5.56	3.99	1.12	Bi-directional	2500	10	-32	3	94	116	2-Wire	Active
NR-25994-C97	EC ST microphone	5.56	3.99	1.12	Bi-directional	4400	5	-27	3	94	111	3-Wire	Active
FG45-32491-000	EC ST microphone	2.565	-	2.55	Omnidirectional	22000	10	-38	3	54	122	3-Wire	Active
FG-23742-D65	EC ST microphone	2.565	-	2.54	Omnidirectional	4400	3	-43	3	58	127	3-Wire	Preferred
FG38-30490-C36	EC ST microphone	2.565	-	2.54	Omnidirectional	4400	1.6	-31	3	66	115	3-Wire	Active
FG-23329-D65	EC ST microphone	2.565	-	2.54	Omnidirectional	4400	3	-33	3	64	117	3-Wire	Preferred
FG-23329-P142	EC ST microphone	2.565	-	2.54	Omnidirectional	4400	3	-34	3	64	118	3-Wire	Preferred
EM-24446-C36	EC ST microphone	3.569	3.569	2.21	Omnidirectional	4400	1.6	-32	3	66	116	3-Wire	Active
EM-26334-C53	EC ST microphone	3.569	3.569	2.21	Omnidirectional	4400	1.6	-32	3	66	116	3-Wire	Active
EM-23446-C36	EC ST microphone	3.569	3.569	2.21	Omnidirectional	4400	1.6	-36	3	66	120	3-Wire	Preferred
DFG-30445-000	EC ST microphone	2.69	-	2.56	uni-directional	1700	3	-49	3	44	133	3-Wire	Preferred
EA-21842-C36	EC ST microphone	5.56	3.99	2.21	Omnidirectional	3500	10	-39	3	94	123	3-Wire	Preferred
EK-23024-C36	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-33	3	68	117	3-Wire	Active
EK-23028-C36	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-37	3	63	121	3-Wire	Active
EK-23132-C36	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-33	3	68	117	3-Wire	Active
EK-23133-000	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-33	3	68	117	3-Wire	Active
EK-26899-P03	EC ST microphone	5.56	3.99	2.18	Omnidirectional	-	10	-51	3	54	135	3-Wire	Active
EK-26899-P58	EC ST microphone	5.56	3.99	2.18	Omnidirectional	-	10	-51	3	54	135	3-Wire	Active
BTM-26901-B01	EC ST microphone	7.24	3.57	1.70	Omnidirectional / Directional	5200	1.3	-35.5	3	65	120	3-Wire	Active
WP-25393-000	EC ST microphone	5.56	3.99	2.21	Bi-directional	4400	1.3	-41.5	3	94	126	3-Wire	Preferred
WP-30113-P132	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-54	3	54	138	3 Wire + Ground	Active
EM-30081-P133	EC ST microphone	3.569	3.569	2.21	Omnidirectional	4400	1.3	-48	3	94	132	3-Wire	Active
FG38-31011-S16	EC ST microphone	2.565	-	2.54	Omnidirectional	4400	1.6	-31	3	66	115	3-Wire	Active
EM-24346-D65	EC ST microphone	3.569	3.569	2.21	Omnidirectional	4400	1.3	-32	3	94	116	3-Wire	Active
EM-24446-G10	EC ST microphone	3.569	3.569	2.21	Omnidirectional	4400	1.6	-32	3	94	116	3-Wire	Active
BFG-30035-G22	EC ST microphone	2.565	-	2.54	Omnidirectional	5200	1.3	-34	3	65.5	118	3-Wire	Preferred
BJ-21590-000	EC ST microphone	7.87	5.59	4.01	Omnidirectional	3900	-	-55.5	3	NA	140	2-Wire	Preferred
BJ-21591-000	EC ST microphone	7.87	5.59	4.01	Omnidirectional	3900	-	-55.5	3	NA	140	2-Wire	Preferred
BJ-23141-134	EC ST microphone	7.87	5.59	4.01	Omnidirectional	300	-	-67.5	3	NA	152	2-Wire	Preferred
BJ-28471-000	EC ST microphone	7.87	5.59	4.01	Noise Cancelling	150	-	-70	3	NA	154	2-Wire	Active

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Search for specific product:

Categories:

Latest News:

Elevating Audio Performance: Advanced Acoustic Design

16/02/2026

At Seltech, acoustic innovation is at the core of what we do. Our team of specialists works alongside you to transform audio requirem…

Search for specific product:

Categories:

Latest News:

Elevating Audio Performance: Advanced Acoustic Design

16/02/2026

At Seltech, acoustic innovation is at the core of what we do. Our team of specialists works alongside you to transform audio requirem…

Speciality Microphones

The BU Series piezo-ceramic accelerometer has output from 20 Hz to above 10 kHz, and is used primarily as a contact microphone for high noise environments. It may also be used as an accelerometer with lightweight structures. As a contact microphone, the BU may be worn on the throat, or touching a bony part of the head (top, temple, or mastoid bone). BU has been integrated into helmet designs for radio communication for military and emergency services.

Name	Description	Diameter / length [mm]	Width [mm]	Thickness [mm]	Directivity	Impedance [Ohm]	Nominal Voltage [V]	Sensitivity @ 1kHz [dBV re. 1V/Pa]	Sensitivity Tolerance [± dB]	SNR [dB]	AOP [dB]	Connection	Product status
TO-24609-B26	EC ST microphone	3.569	3.569	1.30	Omnidirectional	4400	1.6	-36	3	94	120	3-Wire	Active
TO-30034-000	EC ST microphone	7.65	3.58	2.62	Omnidirectional	3750	1.6	-34	3	65.5	118	3-Wire	Preferred
TO-30994-000	EC ST microphone	3.569	3.569	1.30	Omnidirectional	3750	1.6	-34	3	94	118	3-Wire	Active
NR-25994-D63	EC ST microphone	5.56	3.99	1.12	Bi-directional	2000	10	-35	3	94	119	3-Wire	Active
NR-30572-000	EC ST microphone	5.56	3.99	1.12	Bi-directional	4400	10	-32	3	94	116	3-Wire	Active
WP-23501-000	EC ST microphone	5.56	3.99	2.21	Bi-directional	2500	10	-34	3	94	118	2-Wire	Preferred
WP-23502-000	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-32	3	94	116	3-Wire	Preferred
WP-23502-P16	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-32	3	94	116	3-Wire	Preferred
WP-25993-D63	EC ST microphone	5.56	3.99	2.21	Bi-directional	2000	10	-35	3	94	119	3-Wire	Preferred
WP-30113-P03	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-54	3	54	138	3-Wire	Active
VFG-30747-000	EC ST microphone	3	-	3.70	Omnidirectional	4440	3	-35	3	94	119	3-Wire	Active
MR-23151-000	EC ST microphone	22.12	-	9.3	Omnidirectional	300	-	-67	3	94	151	2-Wire	Preferred
NR-23158-000	EC ST microphone	5.56	3.99	1.12	Bi-directional	4400	10	-29	3	94	113	3-Wire	Active
NR-23159-000	EC ST microphone	5.56	3.99	1.12	Bi-directional	2500	10	-45	3	94	129	2-Wire	Active
NR-23160-000	EC ST microphone	5.56	3.99	1.12	Bi-directional	2500	10	-32	3	94	116	2-Wire	Active
NR-25994-C97	EC ST microphone	5.56	3.99	1.12	Bi-directional	4400	5	-27	3	94	111	3-Wire	Active
FG45-32491-000	EC ST microphone	2.565	-	2.55	Omnidirectional	22000	10	-38	3	54	122	3-Wire	Active
FG-23742-D65	EC ST microphone	2.565	-	2.54	Omnidirectional	4400	3	-43	3	58	127	3-Wire	Preferred
FG38-30490-C36	EC ST microphone	2.565	-	2.54	Omnidirectional	4400	1.6	-31	3	66	115	3-Wire	Active
FG-23329-D65	EC ST microphone	2.565	-	2.54	Omnidirectional	4400	3	-33	3	64	117	3-Wire	Preferred
FG-23329-P142	EC ST microphone	2.565	-	2.54	Omnidirectional	4400	3	-34	3	64	118	3-Wire	Preferred
EM-24446-C36	EC ST microphone	3.569	3.569	2.21	Omnidirectional	4400	1.6	-32	3	66	116	3-Wire	Active
EM-26334-C53	EC ST microphone	3.569	3.569	2.21	Omnidirectional	4400	1.6	-32	3	66	116	3-Wire	Active
EM-23446-C36	EC ST microphone	3.569	3.569	2.21	Omnidirectional	4400	1.6	-36	3	66	120	3-Wire	Preferred
DFG-30445-000	EC ST microphone	2.69	-	2.56	uni-directional	1700	3	-49	3	44	133	3-Wire	Preferred
EA-21842-C36	EC ST microphone	5.56	3.99	2.21	Omnidirectional	3500	10	-39	3	94	123	3-Wire	Preferred
EK-23024-C36	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-33	3	68	117	3-Wire	Active
EK-23028-C36	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-37	3	63	121	3-Wire	Active
EK-23132-C36	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-33	3	68	117	3-Wire	Active
EK-23133-000	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-33	3	68	117	3-Wire	Active
EK-26899-P03	EC ST microphone	5.56	3.99	2.18	Omnidirectional	-	10	-51	3	54	135	3-Wire	Active
EK-26899-P58	EC ST microphone	5.56	3.99	2.18	Omnidirectional	-	10	-51	3	54	135	3-Wire	Active
BTM-26901-B01	EC ST microphone	7.24	3.57	1.70	Omnidirectional / Directional	5200	1.3	-35.5	3	65	120	3-Wire	Active
WP-25393-000	EC ST microphone	5.56	3.99	2.21	Bi-directional	4400	1.3	-41.5	3	94	126	3-Wire	Preferred
WP-30113-P132	EC ST microphone	5.56	3.99	2.21	Omnidirectional	4400	10	-54	3	54	138	3 Wire + Ground	Active
EM-30081-P133	EC ST microphone	3.569	3.569	2.21	Omnidirectional	4400	1.3	-48	3	94	132	3-Wire	Active
FG38-31011-S16	EC ST microphone	2.565	-	2.54	Omnidirectional	4400	1.6	-31	3	66	115	3-Wire	Active
EM-24346-D65	EC ST microphone	3.569	3.569	2.21	Omnidirectional	4400	1.3	-32	3	94	116	3-Wire	Active
EM-24446-G10	EC ST microphone	3.569	3.569	2.21	Omnidirectional	4400	1.6	-32	3	94	116	3-Wire	Active
BFG-30035-G22	EC ST microphone	2.565	-	2.54	Omnidirectional	5200	1.3	-34	3	65.5	118	3-Wire	Preferred
BJ-21590-000	EC ST microphone	7.87	5.59	4.01	Omnidirectional	3900	-	-55.5	3	NA	140	2-Wire	Preferred
BJ-21591-000	EC ST microphone	7.87	5.59	4.01	Omnidirectional	3900	-	-55.5	3	NA	140	2-Wire	Preferred
BJ-23141-134	EC ST microphone	7.87	5.59	4.01	Omnidirectional	300	-	-67.5	3	NA	152	2-Wire	Preferred
BJ-28471-000	EC ST microphone	7.87	5.59	4.01	Noise Cancelling	150	-	-70	3	NA	154	2-Wire	Active

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