Pure Resonance Audio RMA120BT Bluetooth 120W Rack Mixer Amplifier

Combine Paging, Music, and Speaker Power in One Rack Unit

The Pure Resonance Audio RMA120BT is a 120W Class D rack-mount mixer amplifier designed for paging, announcements, background music, and general distributed-audio systems. It combines microphone and music-source mixing, Bluetooth streaming, media playback, and amplification in a slim 1U chassis.

Best Uses

• Retail stores and restaurants
• Offices and reception areas
• Schools and training spaces
• Fitness facilities
• Warehouses and public-address systems
• Background music with microphone paging

Amplifier and Speaker Compatibility

• Rated output: 120W
• 70V distributed-speaker output
• 4–16Ω low-impedance speaker output
• Frequency response: 80 Hz to 16 kHz, ±3 dB
• Total harmonic distortion: 0.05%

For 70V systems, add the selected transformer tap of every connected speaker and keep the combined load below the amplifier's 120W rating. Leaving approximately 20% headroom is recommended, so a total load around 96W or less is a practical target.

For low-impedance systems, confirm that the combined speaker load remains within the supported 4–16Ω range.

Bluetooth and Media Playback

• Built-in Bluetooth audio streaming
• USB media playback
• SD/TF card playback
• Built-in FM tuner
• Included IR remote control

Bluetooth is used for audio streaming from compatible mobile devices. It does not provide Wi-Fi, AirPlay, app-based multi-room audio, or network streaming.

Inputs and Paging Features

• Five-channel mixer architecture
• Three microphone inputs
• Two AUX/line inputs
• MIC1 priority ducking for announcements
• Emergency EMC input
• Audio pre-output
• Front-panel bass, treble, source, and master-level controls

MIC1 priority allows paging announcements to reduce lower-priority program audio. The emergency input can override other audio when integrated into a compatible emergency or paging system.

What Is Included

• One Pure Resonance Audio RMA120BT mixer amplifier
• One IR remote control
• One AC power cord

Sold Separately

• 70V or compatible low-impedance speakers
• Speaker wire
• Microphones
• External audio sources
• Paging or emergency-system interface hardware when required

Cooling and Protection

• Variable-speed forced-air cooling
• Overheat protection
• Short-circuit protection
• Operating temperature: 41°F to 104°F

Power, Dimensions, and Weight

• AC input: 110–120V, 60 Hz
• Power consumption: 160W
• Dimensions: 1.73 × 19.05 × 11.61 inches
• Weight: 9.92 lb
• Rack height: 1U

Important Compatibility Notes

This is a single-output mono mixer amplifier, not a multi-zone matrix amplifier. It does not provide independent music sources or volume control for multiple zones.

The current manufacturer specification table lists 70V and 4–16Ω speaker outputs. Although some manufacturer overview text references 70V/100V operation, the detailed current specification table does not list a 100V speaker terminal. For that reason, this page should not promise 100V compatibility.

Need Help Planning Your Speaker Load?

Send Bear Security Shop your speaker models, quantity, transformer tap settings, room size, and paging requirements. We will help confirm whether the RMA120BT has enough power and whether 70V or low-impedance wiring is the better choice.

How much power does the RMA120BT provide?

It provides 120W of rated amplifier output.

Does it support 70V speakers?

Yes. It includes a 70V distributed-speaker output.

Does it support 100V speakers?

The current detailed manufacturer specification table lists 70V and 4–16Ω outputs, not 100V. Some manufacturer overview text mentions 100V, so 100V compatibility should be confirmed before ordering rather than assumed.

Can it power regular 8-ohm speakers?

Yes. It supports conventional low-impedance speaker loads from 4 to 16 ohms.

How many 70V speakers can I connect?

Add the wattage tap of each speaker. Keep the total below 120W, with approximately 96W or less recommended to maintain useful amplifier headroom.

Does it have Bluetooth?

Yes. Bluetooth is built in for wireless audio streaming from compatible phones, tablets, and computers.

Does it support USB or SD card playback?

Yes. The built-in media player supports USB and SD/TF card playback and also includes an FM tuner.

Does it support microphone paging?

Yes. It provides microphone inputs and MIC1 priority ducking so announcements can override lower-priority music sources.

Is this a multi-zone amplifier?

No. It is a single-output mono mixer amplifier. Multiple speaker areas can share the same program audio, but it does not provide independently controlled zones.

Does it have Wi-Fi or app control?

No. Bluetooth is the built-in wireless audio method. Wi-Fi, AirPlay, Ethernet, app control, and network streaming are not specified.

What is included?

The package includes one RMA120BT amplifier, one IR remote control, and one power cord.

What should I confirm before ordering?

Confirm your speaker type, total 70V transformer load or low-impedance load, microphone requirements, audio sources, rack space, and whether 120W is enough for the planned system.