Boom Microphones & Sensors

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Watts Up? A simple formula for recalculating the SPL at different power and distance

12 June 2025

Have you ever stared at a loudspeaker datasheet, scratching your head while trying to figure out what the actual Sound Pressure Level (SPL)…

Knowles’ boom microphones are designed for either flexible or rigid configurations and offer such performance options as noise rejection and high-frequency crossover of near and far field responses. Lengths and end terminations are customized to meet your application needs. Marketers of headsets and audio systems often seek Knowles boom designs. Collaboration with commercial, governmental and industrial designers is producing new helmet applications for aircraft, military, first responder and high-noise manufacturing environments.

Name	Description	Nominal outer diameter [mm]	Length tip-to-tip [mm]	Directivity	Output Impedance [Ohm]	Nominal Voltage [V]	Sensitivity @ 1kHz [dBV re 1V/Pa]	Connection	Product status
PNR-23539-000	Boom microphone	4	119.4	Noise Cancelling	2200	1.3	-40	2-Wire	Active
FB-BL-32508-000	Boom microphone	2.7	171	Noise Cancelling	2200	1.3	-40	2-Wire	Active
FB-BU-34023-000	Boom microphone	2.8	141	Omni-directional	2200	3	-31	2-Wire	Active
FB-CO-33859-L20	Boom microphone	8.64	281.8	Noise Cancelling	2200	10	-41	2-Wire	Active
FB-DL-32509-000	Boom microphone	4.2	317	Noise Cancelling	2200	1.3	-38	2-Wire	Active
FB-FO-25383-000	Boom microphone	5.9	150	Noise Cancelling	2200	1.3	-41	2-Wire	Active
FB-FO-25542-000	Boom microphone	5.9	193	Noise Cancelling	2200	1.3	-41	2-Wire	Active
FB-FO-25581-000	Boom microphone	5.9	130	Omni-directional	4400	1.3	-33	3-Wire	Active
FB-LW-31456-000	Boom microphone	2.79	203.2	Noise Cancelling	2200	1.3	-39	2-Wire	Active
FB-LW-31458-000	Boom microphone	2.79	114.3	Noise Cancelling	2200	1.3	-39	2-Wire	Active
VEK-F-30431-000	Acoustic sensor	16	116	Omni-directional	22000	1.3	-53	3-Wire	Active
VEK-F-30470-000	Acoustic sensor	16	NA	Omni-directional	22000	1.3	-53	3-Wire	Active
VEK-H-30108-000	Acoustic sensor	2.72	230.9	Omni-directional	NA	9	-52	3-Wire	Active
VEK-H-30320-000	Acoustic sensor	2.72	231.9	Omni-directional	NA	9	-33	3-Wire	Active
FB-DW-25989-000	Boom microphone	4.2	190	Noise Cancelling	2200	1.3	-39	2-Wire	Active
FB-DW-30293-000	Boom microphone	4.2	140	Noise Cancelling	2200	1.3	-38	2-Wire	Active
FB-DW-30294-000	Boom microphone	4.2	140	Noise Cancelling	2200	1.3	-39	2-Wire	Active
FB-DW-30296-000	Boom microphone	4.2	140	Noise Cancelling	4400	1.3	-33	3-Wire	Active
FB-DW-32198-000	Boom microphone	4.2	160	Noise Cancelling	2200	1.3	-40	2-Wire	Active
FB-EI-30026-000	Boom microphone	5.4	212	Noise Cancelling	300	NA	-67	2-Wire	Active
FB-EI-31552-000	Boom microphone	5.4	192	Noise Cancelling	300	NA	-67	2-Wire	Active
FB-EI-31809-000	Boom microphone	5.4	214.1	Noise Cancelling	300	NA	-67	2-Wire	Active
FB-EM-30342-000	Boom microphone	5.4	190	Noise Cancelling	2200	1.3	-30	2-Wire	Active
FB-EM-30343-000	Boom microphone	5.4	190	Noise Cancelling	2200	1.3	-31	2-Wire	Active
FB-EM-30344-000	Boom microphone	5.4	190	Noise Cancelling	2200	1.3	-30	2-Wire	Active
FB-EM-30345-000	Boom microphone	5.4	190	Noise Cancelling	2200	1.3	-30	2-Wire	Active
FB-EM-30346-000	Boom microphone	5.4	190	Omni-directional	4400	1.3	-28	3-Wire	Active
FB-FO-23225-000	Boom microphone	4.2	164	Noise Cancelling	2200	1.3	-40	2-Wire	Active
FB-FO-23528-000	Boom microphone	5.9	171	Noise Cancelling	4400	1.3	-36	3-Wire	Active
FB-BU-31193-000	Boom microphone	2.8	155	Noise Cancelling	2200	2	-54	2-Wire	Active
FB-BW-30330-000	Boom microphone	2.7	177	Noise Cancelling	2200	1.3	-38	2-Wire	Active
FB-BW-30335-000	Boom microphone	2.7	177	Noise Cancelling	2200	1.3	-39	2-Wire	Active
FB-CO-28515-L20	Boom microphone	5.9	167	Noise Cancelling	2200	1.3	-40	2-Wire	Active
FB-DO-23511-000	Boom microphone	4.2	161	Noise Cancelling	4400	1.3	-36	3-Wire	Active
FB-DO-23847-E46	Boom microphone	4.2	145	Noise Cancelling	2200	1.3	-41	2-Wire	Active
FB-DR-30366-000	Boom microphone	4.2	165	Noise Cancelling	40	9	-27	2-Wire	Active
FB-DS-25966-000	Boom microphone	4.2	214	Noise Cancelling	2200	1.3	-38	2-Wire	Active
FB-DW-23249-000	Boom microphone	4.2	140	Noise Cancelling	2200	1.3	-40	2-Wire	Active

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BOOM MICROPHONES & SENSORS

Knowles’ boom microphones are designed for either flexible or rigid configurations and offer such performance options as noise rejection and high-frequency crossover of near and far field responses. Lengths and end terminations are customized to meet your application needs. Marketers of headsets and audio systems often seek Knowles boom designs. Collaboration with commercial, governmental and industrial designers is producing new helmet applications for aircraft, military, first responder and high-noise manufacturing environments.

Name	Description	Nominal outer diameter [mm]	Length tip-to-tip [mm]	Directivity	Output Impedance [Ohm]	Nominal Voltage [V]	Sensitivity @ 1kHz [dBV re 1V/Pa]	Connection	Product status
PNR-23539-000	Boom microphone	4	119.4	Noise Cancelling	2200	1.3	-40	2-Wire	Active
FB-BL-32508-000	Boom microphone	2.7	171	Noise Cancelling	2200	1.3	-40	2-Wire	Active
FB-BU-34023-000	Boom microphone	2.8	141	Omni-directional	2200	3	-31	2-Wire	Active
FB-CO-33859-L20	Boom microphone	8.64	281.8	Noise Cancelling	2200	10	-41	2-Wire	Active
FB-DL-32509-000	Boom microphone	4.2	317	Noise Cancelling	2200	1.3	-38	2-Wire	Active
FB-FO-25383-000	Boom microphone	5.9	150	Noise Cancelling	2200	1.3	-41	2-Wire	Active
FB-FO-25542-000	Boom microphone	5.9	193	Noise Cancelling	2200	1.3	-41	2-Wire	Active
FB-FO-25581-000	Boom microphone	5.9	130	Omni-directional	4400	1.3	-33	3-Wire	Active
FB-LW-31456-000	Boom microphone	2.79	203.2	Noise Cancelling	2200	1.3	-39	2-Wire	Active
FB-LW-31458-000	Boom microphone	2.79	114.3	Noise Cancelling	2200	1.3	-39	2-Wire	Active
VEK-F-30431-000	Acoustic sensor	16	116	Omni-directional	22000	1.3	-53	3-Wire	Active
VEK-F-30470-000	Acoustic sensor	16	NA	Omni-directional	22000	1.3	-53	3-Wire	Active
VEK-H-30108-000	Acoustic sensor	2.72	230.9	Omni-directional	NA	9	-52	3-Wire	Active
VEK-H-30320-000	Acoustic sensor	2.72	231.9	Omni-directional	NA	9	-33	3-Wire	Active
FB-DW-25989-000	Boom microphone	4.2	190	Noise Cancelling	2200	1.3	-39	2-Wire	Active
FB-DW-30293-000	Boom microphone	4.2	140	Noise Cancelling	2200	1.3	-38	2-Wire	Active
FB-DW-30294-000	Boom microphone	4.2	140	Noise Cancelling	2200	1.3	-39	2-Wire	Active
FB-DW-30296-000	Boom microphone	4.2	140	Noise Cancelling	4400	1.3	-33	3-Wire	Active
FB-DW-32198-000	Boom microphone	4.2	160	Noise Cancelling	2200	1.3	-40	2-Wire	Active
FB-EI-30026-000	Boom microphone	5.4	212	Noise Cancelling	300	NA	-67	2-Wire	Active
FB-EI-31552-000	Boom microphone	5.4	192	Noise Cancelling	300	NA	-67	2-Wire	Active
FB-EI-31809-000	Boom microphone	5.4	214.1	Noise Cancelling	300	NA	-67	2-Wire	Active
FB-EM-30342-000	Boom microphone	5.4	190	Noise Cancelling	2200	1.3	-30	2-Wire	Active
FB-EM-30343-000	Boom microphone	5.4	190	Noise Cancelling	2200	1.3	-31	2-Wire	Active
FB-EM-30344-000	Boom microphone	5.4	190	Noise Cancelling	2200	1.3	-30	2-Wire	Active
FB-EM-30345-000	Boom microphone	5.4	190	Noise Cancelling	2200	1.3	-30	2-Wire	Active
FB-EM-30346-000	Boom microphone	5.4	190	Omni-directional	4400	1.3	-28	3-Wire	Active
FB-FO-23225-000	Boom microphone	4.2	164	Noise Cancelling	2200	1.3	-40	2-Wire	Active
FB-FO-23528-000	Boom microphone	5.9	171	Noise Cancelling	4400	1.3	-36	3-Wire	Active
FB-BU-31193-000	Boom microphone	2.8	155	Noise Cancelling	2200	2	-54	2-Wire	Active
FB-BW-30330-000	Boom microphone	2.7	177	Noise Cancelling	2200	1.3	-38	2-Wire	Active
FB-BW-30335-000	Boom microphone	2.7	177	Noise Cancelling	2200	1.3	-39	2-Wire	Active
FB-CO-28515-L20	Boom microphone	5.9	167	Noise Cancelling	2200	1.3	-40	2-Wire	Active
FB-DO-23511-000	Boom microphone	4.2	161	Noise Cancelling	4400	1.3	-36	3-Wire	Active
FB-DO-23847-E46	Boom microphone	4.2	145	Noise Cancelling	2200	1.3	-41	2-Wire	Active
FB-DR-30366-000	Boom microphone	4.2	165	Noise Cancelling	40	9	-27	2-Wire	Active
FB-DS-25966-000	Boom microphone	4.2	214	Noise Cancelling	2200	1.3	-38	2-Wire	Active
FB-DW-23249-000	Boom microphone	4.2	140	Noise Cancelling	2200	1.3	-40	2-Wire	Active

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Search for specific product:

Categories:

Latest News:

Watts Up? A simple formula for recalculating the SPL at different power and distance

12 June 2025

Have you ever stared at a loudspeaker datasheet, scratching your head while trying to figure out what the actual Sound Pressure Level (SPL)…

Search for specific product:

Categories:

Latest News:

Watts Up? A simple formula for recalculating the SPL at different power and distance

12 June 2025

Have you ever stared at a loudspeaker datasheet, scratching your head while trying to figure out what the actual Sound Pressure Level (SPL)…

BOOM MICROPHONES & SENSORS

Knowles’ boom microphones are designed for either flexible or rigid configurations and offer such performance options as noise rejection and high-frequency crossover of near and far field responses. Lengths and end terminations are customized to meet your application needs. Marketers of headsets and audio systems often seek Knowles boom designs. Collaboration with commercial, governmental and industrial designers is producing new helmet applications for aircraft, military, first responder and high-noise manufacturing environments.

Name	Description	Nominal outer diameter [mm]	Length tip-to-tip [mm]	Directivity	Output Impedance [Ohm]	Nominal Voltage [V]	Sensitivity @ 1kHz [dBV re 1V/Pa]	Connection	Product status
PNR-23539-000	Boom microphone	4	119.4	Noise Cancelling	2200	1.3	-40	2-Wire	Active
FB-BL-32508-000	Boom microphone	2.7	171	Noise Cancelling	2200	1.3	-40	2-Wire	Active
FB-BU-34023-000	Boom microphone	2.8	141	Omni-directional	2200	3	-31	2-Wire	Active
FB-CO-33859-L20	Boom microphone	8.64	281.8	Noise Cancelling	2200	10	-41	2-Wire	Active
FB-DL-32509-000	Boom microphone	4.2	317	Noise Cancelling	2200	1.3	-38	2-Wire	Active
FB-FO-25383-000	Boom microphone	5.9	150	Noise Cancelling	2200	1.3	-41	2-Wire	Active
FB-FO-25542-000	Boom microphone	5.9	193	Noise Cancelling	2200	1.3	-41	2-Wire	Active
FB-FO-25581-000	Boom microphone	5.9	130	Omni-directional	4400	1.3	-33	3-Wire	Active
FB-LW-31456-000	Boom microphone	2.79	203.2	Noise Cancelling	2200	1.3	-39	2-Wire	Active
FB-LW-31458-000	Boom microphone	2.79	114.3	Noise Cancelling	2200	1.3	-39	2-Wire	Active
VEK-F-30431-000	Acoustic sensor	16	116	Omni-directional	22000	1.3	-53	3-Wire	Active
VEK-F-30470-000	Acoustic sensor	16	NA	Omni-directional	22000	1.3	-53	3-Wire	Active
VEK-H-30108-000	Acoustic sensor	2.72	230.9	Omni-directional	NA	9	-52	3-Wire	Active
VEK-H-30320-000	Acoustic sensor	2.72	231.9	Omni-directional	NA	9	-33	3-Wire	Active
FB-DW-25989-000	Boom microphone	4.2	190	Noise Cancelling	2200	1.3	-39	2-Wire	Active
FB-DW-30293-000	Boom microphone	4.2	140	Noise Cancelling	2200	1.3	-38	2-Wire	Active
FB-DW-30294-000	Boom microphone	4.2	140	Noise Cancelling	2200	1.3	-39	2-Wire	Active
FB-DW-30296-000	Boom microphone	4.2	140	Noise Cancelling	4400	1.3	-33	3-Wire	Active
FB-DW-32198-000	Boom microphone	4.2	160	Noise Cancelling	2200	1.3	-40	2-Wire	Active
FB-EI-30026-000	Boom microphone	5.4	212	Noise Cancelling	300	NA	-67	2-Wire	Active
FB-EI-31552-000	Boom microphone	5.4	192	Noise Cancelling	300	NA	-67	2-Wire	Active
FB-EI-31809-000	Boom microphone	5.4	214.1	Noise Cancelling	300	NA	-67	2-Wire	Active
FB-EM-30342-000	Boom microphone	5.4	190	Noise Cancelling	2200	1.3	-30	2-Wire	Active
FB-EM-30343-000	Boom microphone	5.4	190	Noise Cancelling	2200	1.3	-31	2-Wire	Active
FB-EM-30344-000	Boom microphone	5.4	190	Noise Cancelling	2200	1.3	-30	2-Wire	Active
FB-EM-30345-000	Boom microphone	5.4	190	Noise Cancelling	2200	1.3	-30	2-Wire	Active
FB-EM-30346-000	Boom microphone	5.4	190	Omni-directional	4400	1.3	-28	3-Wire	Active
FB-FO-23225-000	Boom microphone	4.2	164	Noise Cancelling	2200	1.3	-40	2-Wire	Active
FB-FO-23528-000	Boom microphone	5.9	171	Noise Cancelling	4400	1.3	-36	3-Wire	Active
FB-BU-31193-000	Boom microphone	2.8	155	Noise Cancelling	2200	2	-54	2-Wire	Active
FB-BW-30330-000	Boom microphone	2.7	177	Noise Cancelling	2200	1.3	-38	2-Wire	Active
FB-BW-30335-000	Boom microphone	2.7	177	Noise Cancelling	2200	1.3	-39	2-Wire	Active
FB-CO-28515-L20	Boom microphone	5.9	167	Noise Cancelling	2200	1.3	-40	2-Wire	Active
FB-DO-23511-000	Boom microphone	4.2	161	Noise Cancelling	4400	1.3	-36	3-Wire	Active
FB-DO-23847-E46	Boom microphone	4.2	145	Noise Cancelling	2200	1.3	-41	2-Wire	Active
FB-DR-30366-000	Boom microphone	4.2	165	Noise Cancelling	40	9	-27	2-Wire	Active
FB-DS-25966-000	Boom microphone	4.2	214	Noise Cancelling	2200	1.3	-38	2-Wire	Active
FB-DW-23249-000	Boom microphone	4.2	140	Noise Cancelling	2200	1.3	-40	2-Wire	Active

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