Description
Rondson AM240UB 2 240W Compact Bluetooth Amplifier Mixer with AM FM Tuner USB SD Recorder and Siren
Two Hundred and Forty Watts. Half Rack. Go Figure.
Look at the size of the AM240UB 2. Then look at the power rating. Something does not add up.
Half rack width. 44mm high. 3 kg. Yet it pushes 240W RMS into a 100V line or a 4Ω load. That is enough for twenty ceiling speakers across two floors of a pub. Enough for a whole primary school’s classroom network. Enough for a medium sized warehouse with high ceilings eating up SPL.
Class D amplification makes the difference. No massive transformer. No heavy heat sink. Just efficient power conversion that leaves room for everything else.
Same Small Box. Four Times the Muscle.
The AM60UB 2 and AM240UB 2 look identical from the front. Same controls. Same knobs. Same buttons. Same half rack chassis.
Open them up and the story changes.
The 60W unit suits a small shop or a quiet café. The 240W unit handles function rooms, school halls, warehouse paging systems and sports pavilions where background music needs to cut through crowd noise.
Choose based on speaker count, not ambition.
The Recording Feature That Changes Everything
Most compact amplifiers play music from USB sticks. The AM240UB 2 records to them as well.
Plug a microphone in. Press record. Speak. The amplifier saves your announcement, training session or meeting minutes directly to the USB drive or SD card.
| Recording Use | Why It Matters |
|---|---|
| Staff training | Record the session. New hires listen later. |
| Meeting minutes | No note taker. Audio archive exists. |
| Emergency drills | Record the test. Prove compliance. |
| Event announcements | Pre record. Play back on loop. |
No external recorder. No laptop. No audio interface. The amplifier does it alone.
Sources That Live Inside the Box
External players fail. They fall off racks. Their power supplies die. Someone steals the Bluetooth dongle.
The AM240UB 2 buries everything inside the chassis.
| Source | Output | Real World |
|---|---|---|
| AM FM tuner | Radio | Live sports. Talk radio. Local news. No internet needed. |
| USB port | Play and record | 240W needs hours of music. USB delivers. |
| SD card slot | Play and record | Backup library. Swap cards for different venues. |
| Bluetooth | Stream | Wedding DJ plays from phone. Event manager uses tablet. |
The remote control handles track skipping, volume and source selection without walking to the amp.
The Mic Input That Punches Above Its Weight
One balanced XLR combo input. Switchable 15V phantom power. Two microphone outputs from the same input? Look again at the spec sheet. The AM240UB 2 has two phantom powered mic inputs despite the single XLR label. Check the rear panel.
| Mic Feature | Application |
|---|---|
| XLR combo | Professional mics or guitar jack cables |
| Balanced | Long runs through ceilings without hum |
| 15V phantom | Condenser goosenecks. Lapel mics. Choir mics. |
Two phantom powered channels in a half rack unit is unusual. Rondson squeezed extra functionality into the same chassis.
Siren. Priority. Compliance.
Two buttons on the front panel.
One triggers a siren tone. Shoplifter running for the exit? Press it. The siren cuts through every speaker in the building. Security teams use this daily.
The other prepares the priority mute input. Wire it to a fire alarm panel. When the alarm sounds, the amplifier kills all background music instantly. Only emergency announcements pass through.
Fire alarm compliance without external ducking processors. One cable from the panel to the amp. Done.
The Controls That Refuse to Confuse
Individual volume for each input. Bass. Treble. Master volume.
No menu diving. No tiny LCD screen. No instructions taped to the wall.
A function room manager can turn down the Bluetooth, turn up the microphone and adjust the bass without calling for help.
Protection That Saves Your Investment
| Protection | What It Does |
|---|---|
| Fan cooling | Runs all day. Does not overheat. |
| Thermal shutdown | Kills output before damage occurs. |
| Overload protection | Stops input spikes from frying the amp. |
| Short circuit protection | Speaker wires touch. Amplifier survives. |
A ceiling speaker fails and shorts the 100V line. The AM240UB 2 detects the fault, shuts down that channel and waits for you to fix the problem. No blown output stage. No replacement amplifier.
Mounting Options for Real Racks
Half rack width. 215mm wide. 44mm high. 315mm deep.
| Bracket | Result |
|---|---|
| None | Shelf mount. Wall mount. Cupboard slide. |
| EQ 4000 | Two units side by side in a full 19 inch 1U rack. |
| EQ 4500 | Single unit centred in a half 19 inch rack slot. |
Brackets sold separately. Order what fits your installation.
Technical Specifications
| Parameter | Value |
|---|---|
| Model | AM240UB 2 |
| Power output | 240W RMS |
| Speaker outputs | 100V line or 4Ω |
| Mic inputs | Balanced XLR combo with 15V phantom (2 channels) |
| AUX input | RCA |
| LINE output | RCA |
| Built in sources | AM FM tuner, USB with recording, SD with recording, Bluetooth |
| Recording format | Direct to USB or SD |
| Remote control | Included |
| Frequency response | 80 Hz – 18,000 Hz (±3dB) |
| Signal to noise mic | > 60 dB |
| Signal to noise line | > 70 dB |
| Signal to noise media | > 60 dB |
| THD | < 1% |
| Power supply | AC 110V/240V – 50 Hz |
| Consumption | 400W |
| Cooling | Fan |
| Protection | Thermal, overload, short circuit |
| Dimensions | 44 x 215 x 315 mm (half rack) |
| Weight | 3 kg |
| SKU | 02728 |
| EAN | 3701567911491 |
What’s in the Box
AM240UB 2 amplifier
Remote control for media player
IEC power lead
Antenna for AM FM tuner
Documentation
Brackets sold separately. EQ 4000 for full 19 inch rack mounting. EQ 4500 for half 19 inch mounting.
Where 240W Makes the Difference
| Venue | Why 60W Is Not Enough | Why 240W Works |
|---|---|---|
| Function rooms | Wedding crowds talk loud. Music needs headroom. | 240W fills the space without distortion. |
| School halls | Assembly of 200 children. Voice needs to cut through. | PA system reaches the back row. |
| Warehouse paging | High ceilings eat SPL. Forklift noise competes. | Announcements heard over machinery. |
| Sports pavilions | Crowd noise. Echo from hard surfaces. | Background music stays audible. |
| Primary schools | Multiple classrooms on one 100V loop. | Each tap gets enough power. |
| Community centres | Varied events. Band needs volume. Speech needs clarity. | One amp handles both. |
| Factory canteens | Shift changes. Crowded room. Loud conversation. | Music keeps atmosphere without straining. |
| Bowling alleys | Lanes are long. Speakers at distance. | 100V line needs power for cable losses. |
| Church halls | Overflow rooms. External grounds. Multiple zones. | Distributed speakers all fed adequately. |
Supply and Installation
Supply
The AM240UB 2 is available for immediate despatch. SKU 02728. EAN 3701567911491.
Trade accounts, installer pricing and project quotations welcome. Brackets ordered separately: EQ 4000 (full 19 inch) or EQ 4500 (half 19 inch).
Installation
Volume Music Solutions installs compact high power amplifier systems for function rooms, school halls, warehouses, sports pavilions, factories, community centres, bowling alleys, church halls and any venue where 60W is not enough but rack space is still tight.
We handle 100V load calculations, ceiling speaker networks, priority mute integration with fire alarms, siren button placement and staff training.
System Design
Not sure between 60W and 240W? Send us your room sizes, ceiling heights and speaker counts. We will calculate the 100V load and tell you exactly which amplifier suits your venue.
Contact Volume Music Solutions
Based in Buckingham. Covering the whole UK.
📞 Call us to discuss high power compact amplifier installations
📧 Email your room dimensions, ceiling height and speaker requirements for a written quote
📝 Contact form for non urgent enquiries
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