Nady U-81 Octavo LT/O Wireless Omnidirectional Lavalier Microphone System

Need to reinforce a lot of performers? Run 8 wireless lavalier mics with the Nady U-81 Octavo wireless system. The 8-channel receiver fits in one rack space.

The Nady U-81 Octavo LT/O Wireless Omnidirectional Lavalier Microphone System operates on eight independent single-channel UHF wireless receivers, in a single housing for simultaneous operation of up to eight transmitters. A front-panel LED display indicates the RF and AF status for each channel. Channels 1-8 offer individually balanced XLR Mic Level outputs, with an unbalanced Line Level sum 1/4" jack output for 8-in-1 mix audio output with separate volume control for each channel. Nady's exclusive patented companding circuitry delivers 120 dB dynamic range and high-quality audio for unsurpassed UHF performance.

This system comes with 8 BT-8U bodypack transmitters and 8 LM-14/O omnidirectional lavalier microphones.

Receiver Features:

- Operates on select UHF frequencies
- Eight independent single-channel UHF wireless receivers in a single housing for simultaneous operation of up to eight transmitters -- any combination of HT-8U handheld and/or BT-8U bodypack
- Front panel LED display indicates the RF and AF status for each channel
- Ch 1-8 individually balanced XLR Mic Level outputs and unbalanced Line Level sum 1/4" jack output for 8-in-1 mix audio output with separate volume control for each channel
- Nady's exclusive patented companding circuitry with 120dB dynamic range and highest quality audio for unsurpassed UHF performance
- Dual removable high gain antennas with TNC connector, front or back mounting
- Standard 19" 1U, all-metal rackmount housing
- Externally read more powered with AC/DC adapter (included)

BT-8U Bodypack Transmitter Features:

- Choice of headworn or lavalier microphone operation with convenient input volume control for proper level adjust, or instrument operation without input level control
- Off/Standby/On switch allows convenient audio muting while transmitter on
- Locking 35mm mini-jack provides secure connection for removable mic or instrument cable
- Status LED indicator flashes once for unit on; lights steady for low-battery alert
- Single 9V alkaline or NiMH battery
- Lightweight, rugged ABS housing with integral antenna
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- RF Carrier Frequencies: Selected factory installed frequencies between 902-928MHz and 944-952MHz
- Frequency stability: +/-0.005% (Crystal Controlled)
- Audio Deviation: FM +/-20kHz normal, +/-50kHz maximum
- Frequency Response: 20Hz-20kHz, -3dB
- Dynamic Range: 120dB
- Harmonic Distortion: 0.5% THD, normal
- Operating Range: 250 feet normal, 500+feet max line of sight

- Reception: Mono antenna reception
- Antennas: 10" (25.4 cm) Dual adjustable angle
- Mute Threshold: -95dBm (none-adjustable)
- Image Rejection: -70dB, minimum
- Balanced output: Audio outputs: +/-24mV fixed level (600 Ohms)
- Unbalanced MIX output: Audio output: 360mV variable level (Open load)
- Connectors: Balanced: XLR, Unbalanced: 1/4" TS, Antennas: TNC connector. DC in: 2.1mm barrel type
- Indicators: Power On, RF and AF LEDs
- Controls: Power ON/OFF buttons, Volume Controls
- Power Requirement: 15VDC/1200mA
- Dimensions:14.25" x 12" x 1.75 [W / D / H] (36.20 cm x 30.50 cm x 4.45 cm) [W / D / H]
- Weight: 7.20 lbs (3.37 Kg)

- Models Available: UH-81 Handheld and UB-81 Bodypack
Input Connectors
- UH-81 Handheld: Integral Nady DM-50D neodymium dynamic cartridge
- UB-81 Bodypack: 3.5mm locking mini-jack,
- UH-81: Power ON/STDBY/OFF
- UB-81: ON/STDBY/OFF, Input Level Control (LT/HM), selectable inputs--internal HM/LT switches
- RF Power: 20mW normal (50mW Maximum allowed by FCC)
- Harmonics and Spurs: < -50 dB
- Antennas: UH-81/UB-81: Internal antennas
LED Indicators
- UH-81/UB-81: Single LED flashes once for "ON", lights steady for "LOW BAT"
- UH-81: 2xAA Alkaline or NiMH batteries
- UB-81: Single 9V Alkaline or NiMH battery
- Battery Life: 8-10 Hours (Alkaline)
- UH-81: 10.5"x 1.875" (26.7 cm x 4.8 cm)
- UB-81 : 4.25" x 2.5"x 1.0" (10.8 cm x 6.4 cm x 2.5 cm)
- Weight:
- UH-81: 7.5 oz (213 g) without battery
- UB-81: 3.1 oz (88 g) without battery
Dimensions and Weight in Packaging
Shipping Weight: 11.75 lbs
Shipping Dimensions: 21 x 13 x 5 in

Consumer Alert

Most users do not need a license to operate this wireless microphone system. Nevertheless, operating this microphone system without a license is subject to certain restrictions: the system may not cause harmful interference; it must operate at a low power level (not in excess of 50 milliwatts); and it has no protection from interference received from any other device. Purchasers should also be aware that the FCC is currently evaluating use of wireless microphone systems, and these rules are subject to change. For more information, call the FCC at 1-888-CALL-FCC (TTY: 1-888-TELL-FCC) or visit the FCC's wireless microphone website at

NOTE: None of the wireless systems we carry are capable of violating the FCC guidelines stated above. We are presenting this information as a matter of legally required disclosure.

For support or warranty questions, please contact the manufacturer:
Phone: 510-652-2411

Reviewers gave this product an overall rating of 1 out of 5 stars. (1 ratings)
Submitted October 23, 2021 by Nicholas Boyer in Houston, TX
"Not an audio solution"
Overall: 1 out of 5 stars
Verified Customer zZounds has verified that this reviewer made a purchase from us.
This thing is ugly and doesn’t work unless you use one mic. I don’t know why they put 8 terrible sounding mics could have just charged 80 dollars for one.
The sound is okay when it actually comes through. However you will lose signal every other word. As long as I use one mic it’s okay try using two mics and the whole thing falls apart. I mean its 600 dollars. I get it and I don’t expect a lot but why offer 8 mics when only one works?
The least useful quality of this unit is the unit itself. I tried using this thing 10 feet from my subjects and I picked up a country western station instead of their voices…
Ease of Use
I mean I didn’t try to throw it off anything high but I wanted to. It is made of metal so I’m confident that if I wanted to destroy it that I would have to put a decent amount of effort into it.
I mean just save yourself the trouble and buy a quality digital product. Radio frequency transmitters are awful.
Manufacturer Support
I mean I didn’t see the point.
The Wow Factor
No appeal could be found honestly. This thing looks cheap, doesn’t work, and will give you brain cancer trying to get sounds better than farting out of it.
Musical Background:
Masters Degree in Music Entertainment and BS in audio engineering from Full Sail University
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