The gray Sanken COS-11D Omni Lavalier Microphone with Reduced Sensitivity and 3.5mm Locking Sennheiser Connector is a subminiature lav mic designed to deliver clear, full-bodied sound and reliable performance, making it a popular choice among industry professionals in broadcast, TV, theater, film, videography, and more. 

Engineered to meet the standards of modern digital wireless microphone systems, the COS-11D is RF shielded to eliminate interference issues and ensure a pristine audio signal. The microphone capsule features a rectangular design that sits vertically, increasing the surface area and allowing this little mic to offer a rich, full sound that outperforms many larger models.

The mic's 50 Hz to 20 kHz frequency response rolls off extreme low end and provides accurate, transparent audio reproduction with a small presence boost in the 6 kHz area for crisp, intelligible speech. With a forgiving omnidirectional polar pattern that picks up sound in a 360° pattern, levels stay consistent—even when the subject turns away from the mic.

A water-resistant mesh screen protects against humidity, perspiration, makeup, bad weather, and other potential on-location issues, while the durable cable is also moisture resistant and built to stay soft and pliable, even after extended use. This version of the COS-11D terminates in a locking 3.5mm connector and is wired for use with Sennheiser transmitters. A metal windscreen, holder clip, rubber mount, and plastic case are included.

For Broadcast, Film/Video & Presentation    Omnidirectional for Consistent Levels    For Sennheiser Transmitters with 3.5mm    -9 dB Reduced Sensitivity Level    Rugged 5.9' Cable Stays Pliable    RF Shielded for Digital Wireless    Water Resistant    Small Size is Easy to Conceal    Requires 3 to 10 VDC    Includes Windscreen, Mount & Clip

• Sennheiser: Works with Sennheiser bodypack transmitters equipped with a locking 3.5mm connector, including the Evolution (ew), XSW-D, and SpeechLine (SL) Series
• Also works with many third-party wireless transmitters and portable audio recorders that are equipped to supply 3 to 10 VDC through a locking 3.5mm connector wired for Sennheiser compatibility.

Related Questions and Answers

Q: 1. what is the latency ?

A: According to the manufacturer, because the Sennheiser EW 112P G4 Camera-Mount Wireless Omni Lavalier Microphone System sends an analog audio signal, it has no latency.

Q: 2. has anyone use Sennheiser EW 112P G4 to send line level audio from a computer audio out to a mixer board line level in stereo i know i will need a 3.5 to 3.5 mm for the transmitter and 3.5 to RCA for the mixer board line in?

A: While the Sennheiser EW112PG4 can be used to transmit line level audio wirelessly, it will only send a single channel of audio. You can mono sum the output of the computer using this device, BH #RALTIBLOX , use the BH# SECL2 cable for xlr into the transmitter, and go single XLR out into the mixer. If you need stereo sends, you would need two transmitters and two receivers for the 2 channels of audio. Here a system, more designed for stereo transmission, BH #ALSTEALTHWRL.

Q: 3. What’s the best mic for this unit? I’ve heard the included mic is average.

A: For me the best lav for the the G4 would be Sanken COS-11D Omni Lavalier Mic, Normal Sens, Hardwired 1/8" TRS Connector for Sennheiser Evolution Wireless Transmitter. It is a fantastic lav this is the B&H part number B&H # SAC11WNSETRB.

Q: 4. are these still legal in the US? Here's what the FCC says about frequencies - Unlicensed wireless microphone use is permitted on the 902-928 MHz band, the 1920-1930 MHz, and on portions of the 2.4 GHz and 5 GHz bands under specified power levels and rules for operation for each of those bands.

A: These are legal in The US without a liscence. The FCC currently allows wireless microphones in the range of 470-608Mhz to opperate.

Q: 5. Can I used this mic to shoot with my gopro 6?

A: Yes you can, if you have the GoPro Pro 3.5mm Mic Adapter, BH #GO35MA. https://bhpho.to/2xKXdEv

Q: 6. Is this safe to use with the Verizon 5G frequency ban? The FCC says 600MHz, but it also says something about some ranges in the 500MHz frequency band as well.

A: The Sennhieser EW 112P G4 UHF wireless systems work within the FCC- allowed range of 470-608MHz. 5G cellular service operated on higher frequencies than this. Sennheiser wireless systems allow for auto scanning, with 1680 frequencies to choose from, making it easy to find a clean frequency, even in the crowded UHF spectrum. .

Q: 7. I've read that the AVX series introduces a 19 ms delay. Does this system introduce any delay? I will sometimes want to run wireless and wired microphones at the same time.

A: Hi Dave - the evolution Wireless series is an analog wireless system that operates on UHF frequencies - there's no delay with respect to transmission time. However, the distance of your wired microphone capsule from your wireless lav capsule should also be taken into consideration - due to timing differences between direct audio and distant audio, you can get a phasing sound, making your audio a bit hollow or lacking body. The AVX system operates on a DECT Wireless standard, which has 19ms of delay - we generally recommend to not mix G4 and AVX wireless together for that reason.

Q: 8. Purchasing two sets of this, would it be smart to buy one of each frequency range? Will both be good in NYC?

A: You can definitely use two of the Sennheiser EW 512P G4 Camera-Mount Wireless Omni Lavalier Microphone Systems that operate on the same frequency band in New York City. The system has 3,520 auto-scan frequencies for the system to select from to transmit audio and up to 32 systems can be used simultaneously on the same band.

Q: 9. If I purchase a Sennheiser SKP 500 G4 Pro separately in the future, can it used with this EW 512 G4 model?

A: Yes, the Sennheiser SKP 500 G4 Pro plug-on transmitter is compatible for use with the EK 500 G4 Pro receiver that is included with the EW 512P G4 wireless lavalier system as long as both components operate on the same frequency band. You will need to purchase an SKP 500 G4 transmitter on the same frequency band as the EW 512P G4 system. The EK 500 G4 receiver can be used with only one transmitter at a time so you will have the option of using it with either the SK 500 G4 bodypack transmitter that is included in the EW 512P G4 system or using the SKP 500 G4 plug-on transmitter.

Q: 10. What is the difference from the EW 512P to the EW 100? - In other words, why is there such a price difference?

A: The ew 512P system has a wide 88 MHz bandwidth with 3520 frequencies and an adjustable RF output level of 10, 30 or 50 mW. Depending on your location, you can operate up to 32 wireless systems simultaneously. The ew 100 has a 42 MHz bandwidth with 1680 frequencies and a fixed RF output level of 30 mW. You can use up to 12 ew 100 systems at the same time depending on the environment. The ew 512P includes the MKE 2 lavalier which is a more professional mic than the ME 2-II (or ME 4) which is included with the ew 100 system. Additionally, the ew 512P has a headphone jack on the receiver but the ew 100 does not have a headphone jack. The ew 100 system also includes a plug-on transmitter (SKP 100) for use with dynamic mics and mics that do not require phantom power. If you do want to add on a similar plug-on transmitter for the ew 512 or use the ew 500 system, the SKP 500 does supply +48V phantom power.