What is the SDR-5616?

The Fitness Audio SDR-5616 is a UHF Synthesized True Diversity wireless microphone receiver and the core component of the U-Series wireless system. It uses dual antennas and 16 selectable UHF channels to deliver stable, high-fidelity audio with virtually zero dropouts in demanding fitness environments.

What is true diversity and why does it matter?

True diversity means the SDR-5616 uses two independent antennas and automatically switches to whichever has the strongest signal at any moment. This eliminates the dropouts and dead spots common with single-antenna systems, ensuring consistent wireless performance across the room.

Which frequency band should I choose?

If replacing an existing receiver, select the same frequency band as your current Fitness Audio system. Available bands are 520, 536, 540, 560, and 580 MHz. If unsure, select the I'm Not Sure option at checkout and the Fitness Audio team will help determine the right band for your facility's region.

What microphones are compatible with the SDR-5616?

The SDR-5616 is compatible with all Fitness Audio U-Series bodypack transmitters and MTU8 Mini transmitters, supporting headset microphones including the Aeromic AM11LS, Cyclemic CM-11, E-Mic, and FM-41 — all with T4 (4-Pin Mini-XLR) connectors.

Is the SDR-5616 rack mountable?

Yes — the SDR-5616 is designed for rack installation and is compatible with the Fitness Audio AeroLink Bluetooth receiver joiner plate for shared 19-inch rack space installation.

What comes in the box with the SDR-5616?

Includes: (1) SDR-5616 UHF Diversity Receiver, (1) System Power Supply, (1) 1/4 inch Line Cable, and User Manual.

SDR-5616

Name: SDR-5616
Brand: Fitness Audio Americas
SKU: SDR-5616-SU520
Price: 295.0 USD
Availability: InStock

Back view of black Fitness Audio U-Series Receiver featuring two antenna inputs, in and outputs, and min/max SQ.

$295.00

Shipping calculated at checkout.

Which frequency should I choose?

If you’re replacing a receiver, select the same frequency band as your current Fitness Audio System above.

Unsure which fits your facility? Just enter your Facility ZIP Code below.

Adjustable Squelch Control

Zero-Dropout Wireless Stability

Free US Shipping

In stock, ready to ship
Backordered, shipping soon

The Heart of Your Sound System.

The Fitness Audio SDR-5616 is the rock-solid foundation of the U-Series wireless microphone system. Built with true diversity UHF technology, it delivers stable, high-fidelity audio with virtually zero dropouts — even in demanding fitness environments.

Using dual antennas and 16 selectable UHF channels, the SDR-5616 ensures interference-free performance in crowded wireless spaces. Clear LED indicators provide instant visual confirmation of RF signal and antenna activity, while adjustable squelch control lets you fine-tune the signal for the cleanest possible output.

With professional balanced XLR output and universal 1/4" jack connectivity, the SDR-5616 integrates seamlessly with mixers, amplifiers, and installed sound systems.

Reliable. Clean. Built for daily commercial use.

Fitness clubs running U-Series systems
Spin & HIIT studios
Multi-room training facilities
Venues needing stable wireless mic performance
Facilities upgrading older wireless receivers

True Diversity Technology

Dual independent antennas eliminate dropouts and interference.

16 Selectable UHF Channels

Find a clear frequency even in crowded RF environments.

Professional Outputs

Balanced XLR + unbalanced 6.35mm for universal system compatibility.

Adjustable Squelch Control

Fine-tune RF sensitivity to eliminate background noise.

Clear LED Monitoring

Instant RF signal and antenna status visibility.

Receiver Type: UHF Synthesized True Diversity
Channels: 16 Selectable UHF
S/N Ratio: >105dB(A)
T.H.D.: <0.6% @ 1KHz

Outputs:

1 × Balanced XLR
1 × Unbalanced 6.35mm Jack

Power Supply: DC 12V / 500mA

Dimensions: 210(W) × 44(H) × 180(D) mm

U-Series Beltpack UHF System

Compatible Mics: Aeromic, Cyclemic, E-Mic, FM41 (T4 versions)
Connector: 4-Pin Mini XLR (T4)

U-Series MTU8 Mini Tx

Compatible Mics: Aeromic, Cyclemic, E-Mic, FM41
Connector: 4-Pin Mini XLR (T4)

Fitness Audio DX6 Digital

Compatible Mics: Aeromic, Cyclemic, E-Mic (T4 versions)
Connector: 4-Pin Mini XLR (T4)

(1) SDR-5616 UHF Diversity Receiver
(1) System Power Supply
(1) 1/4" Line Cable
User Manual

If replacing an existing unit, select the same frequency band as your current system.

If unsure, determine compatibility by facility location or consult frequency allocation for your region.

The Fitness Audio SDR-5616 is a UHF Synthesized True Diversity wireless microphone receiver and the core of the U-Series wireless system. Dual antennas and 16 selectable UHF channels deliver stable, high-fidelity audio with virtually zero dropouts in demanding fitness environments.

True diversity means the receiver uses two independent antennas and automatically switches to whichever has the strongest signal at any moment — eliminating the dropouts and dead spots common with single-antenna systems.

If replacing an existing receiver, select the same frequency band as your current Fitness Audio system (520, 536, 540, 560, or 580 MHz). If unsure, select the "I'm Not Sure" option at checkout and the Fitness Audio team will confirm the right band for your region.

16 selectable UHF channels within its frequency band, allowing you to find a clean, interference-free frequency even in crowded wireless environments with multiple systems running nearby.

The adjustable squelch control lets you fine-tune the receiver's RF sensitivity threshold — filtering out background noise and interference while maintaining a clean signal from the transmitter. Especially useful in high-density wireless environments.

One balanced XLR output and one unbalanced 6.35mm jack output — providing seamless integration with Aeromix mixers, power amplifiers, and installed sound systems.

Compatible with all Fitness Audio U-Series bodypack and MTU8 Mini transmitters, supporting the Aeromic AM11LS, Cyclemic CM-11, E-Mic, and FM-41 headsets — all with T4 (4-Pin Mini-XLR) connectors.

Yes — if your existing headset uses a T4 connector and a compatible U-Series or MTU8 bodypack transmitter, it will work with the SDR-5616. Contact us to confirm compatibility with your specific setup.

Yes — the SDR-5616 is designed for professional rack installation and is compatible with the Fitness Audio AeroLink joiner plate for shared 19-inch rack space installation.

Includes: (1) SDR-5616 UHF Diversity Receiver, (1) System Power Supply, (1) 1/4" Line Cable, and User Manual.

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SDR-5616

Frequently asked questions

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