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Polsen OLM-20 Dual Omnidirectional Lavalier Microphone

BH #POOLM20 • MFR #OLM-20
45 reviews
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Polsen OLM-20 Dual Omnidirectional Lavalier Microphone
Key Features
  • Dual OLM-10 Omnidirectional Mic Capsules
  • Single 1/8" Stereo Connector
  • Each Mic Routes to Discrete Channel
  • Left/Right Channel Indicated on Mics
Designed for recording interviews, the OLM-20 Dual Omnidirectional Lavalier Microphone from Polsen is comprised of two of the well-received OLM-10 omnidirectional lavalier microphones. It terminates in a single 1/8" stereo connector, with each microphone recording to a discrete channel on your DSLR, camcorder, or audio recorder with a microphone input. Not limited to just interview applications, the OLM-20 can be used for presentations, podcasts, webcasts, or any situation where more than one subject needs to be recorded.
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Polsen OLM-20 Overview

Designed for recording interviews, the OLM-20 Dual Omnidirectional Lavalier Microphone from Polsen is comprised of two of the well-received OLM-10 omnidirectional lavalier microphones. It terminates in a single 1/8" stereo connector, with each microphone recording to a discrete channel on your DSLR, camcorder, or audio recorder with a microphone input. Not limited to just interview applications, the OLM-20 can be used for presentations, podcasts, webcasts, or any situation where more than one subject needs to be recorded.

The OLM-20's dual electret condenser capsules are designed to deliver clear and natural sound, with their omnidirectional polar pattern providing off-axis response, even if the subject turns their head while talking. Both mics offer low sensitivity to wind and handling noise, as well as vocal plosives.

Thanks to its battery-operated design, the OLM-20 can be used with any camera or recorder that supports a 1/8" stereo mic level input, without the need for additional equipment or adapters. Each microphone records to a discrete channel, and the microphones themselves are labeled left and right. Its 13.5' cable provides 10' of distance between each microphone for comfortable placement, while the included tie clips allow for hands-free use.

Omnidirectional Polar Pattern
The omnidirectional polar pattern provides excellent off-axis response, even if a subject turns their head while speaking
Wide Range of Compatibility
Compatible with DSLR cameras, camcorders, and most devices with a 1/8" (3.5mm) mic-level input
No Extra Accessories Needed
The OLM-20's design sends each microphone to a discreet channel without need for extra adapter or mixer
Low Sensitivity to Wind Noise and Vocal Plosives
Each microphone offers low sensitivity to wind, handling noise, and vocal plosives
13.5' (4.1 m) Cable
The 13.5' cable provides 10' of distance between each mic, 1' of distance between its battery box and stopper, and 2.5' of distance from the battery box to its 1/8" (3.5mm) connector
In-Line Battery Pack and Power Switch
The OLM-20 is powered by a 1.5 V button cell battery (included) and does not require external power for operation. The power switch conserves battery life
Tie Clip and Foam Windscreen
The included tie clips allow for hands-free operation while the windscreens help ensure quiet, professional-quality recordings
UPC: 847628578777

Polsen OLM-20 Specs

Key Specs
Microphone Type
Lavalier (Dual Capsules & Cables)
Polar Pattern
Omnidirectional
Element Type
Electret Condenser
Power Sources
Battery
Microphone
Microphone Type
Lavalier (Dual Capsules & Cables)
Polar Pattern
Omnidirectional
Element Type
Electret Condenser
Sound Field
Mono
Performance
Frequency Response
30 Hz to 18 kHz
Sensitivity
-65 dB
Connectivity
Analog Output Connector
1x 1/8" / 3.5 mm TRS Male
Cable Length
13.5' / 4.1 m
Power
Power Sources
Battery
Operating Voltage
1.5 V
Battery Type
1x LR44/1.5 V Button (Included)
Physical
Environmental Resistance
No
Packaging Info
Package Weight
0.32 lb
Box Dimensions (LxWxH)
7.45 x 4.45 x 1.15"

Polsen OLM-20 Reviews

Two Separate Voice Channels on my Hn1

By Wayne
Rated 5 out of 5
Date: 2025-05-09

Works well.

Perfect!

By Jerry
Rated 5 out of 5
Date: 2021-07-20

I just needed a simple mic for interviews and this was ideal. I like that each mic goes to a different channel (easy for editing) and can use just one mic if I want. The cable is sturdy and I like that the on/off switch shows red when its on (so I can easily tell). Cable length is just right and sound is perfect.

See any errors on this page?

question

Is this mic compatible with a Nikon D3100?
Asked by: Ismael R.
Unfortunately the Nikon D3100 does not feature a mic input jack and is unable to support external mics.
Answered by: Jeff P.
Date published: 2018-08-25

question

will this work on the iphone 6?
Asked by: Anonymous
I just bought this microphone and it records fine to my iPhone 6 without the above adaptor (in fact, I bought the adaptor on the advice of this Q&A and it didn't record at all through the adaptor, and kept trying to activate voice control). Both left and right mics record into a single channel on the phone, but they record fine.
Answered by: Christy T.
Date published: 2019-01-03

question

will this mic work with an IPhone 5?
Asked by: Anonymous
The Polsen OLM-20 requires an important accessory to work with any smartphone; a trs female to a trrs male adapter. https://bhpho.to/2jPrHyu
Answered by: Andrea O.
Date published: 2018-08-25

question

For staff - Can I use the dual lav with my Panasonic Lumix G7 directly? Can I use the dual lav with this adaptor ( http://www.bhphotovideo.com/c/product/985832-REG/kopul_a_xmmf_adapter_xlr_male.html ) to my Tascam DR-40? (there an issue going into one XLR on this recorded? Thanks so much!
Asked by: Anonymous
The OLM-20 is directly compatible with the Lumix G7 and will record both mics discreetly to left and right sides. It can be used with the Kopul adapter as well, however will combine both sides to single mono signal when connected to the recorder.
Answered by: Jeff P.
Date published: 2019-09-04

question

I like the idea of having two mics for interviews, but will only need one mic most of the time. Can I deactivate one mic so I have clean sound?
Asked by: Casey H.
Not sure, but I don't see how. We fed the cord through a plastic straw, taped it up with pretty tape and used it as a stick microphone. It looks like from the 70's but worked. We used it as mics for judging competitions.
Answered by: Deb S.
Date published: 2018-08-25

Can the LR44 battery this comes with be replaced ...

Can the LR44 battery this comes with be replaced with a 357 battery?
Asked by: Lucius
I am not seeing that Polsen lists compatibility with 357 batteries for the OLM-20 lavalier microphone.
Answered by: David M
Date published: 2023-04-30

I just received this mic and i thought I was two ...

I just received this mic and i thought I was two separate mics. they are both on the same cable. how are they used?
Asked by: ry
They are designed to be used simultaneously - for example, it is a handy solution for recording two people in an interview setting.
Answered by: Eliya
Date published: 2019-04-29

I've had one for 2 yrs but not yet figured out ...

I've had one for 2 yrs but not yet figured out how to reduce loud background talk noise at large exhibition halls, where I use it for interviews. Any ideas or alternative mics?
Asked by: Chih
Have you tried to make sure the lav is as close as possible to the interviewee mouth.
Answered by: John
Date published: 2019-04-14
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