1. Introduction
This manual provides detailed instructions for the safe and efficient operation of your Karma RDM 12A Amplified Bluetooth Speaker. Please read this manual thoroughly before using the product and retain it for future reference.
2. Safety Instructions
To ensure safe operation, please observe the following precautions:
- Do not expose the speaker to rain or moisture.
- Do not block any ventilation openings.
- Do not install near any heat sources.
- Only use attachments/accessories specified by the manufacturer.
- Unplug this apparatus during lightning storms or when unused for long periods.
- Refer all servicing to qualified service personnel.
3. Package Contents
Please check that all items are present and in good condition:
- Karma RDM 12A Amplified Bluetooth Speaker
- Remote Control
- Power Cable
- User Manual (this document)
4. Product Overview
The Karma RDM 12A is a versatile amplified speaker featuring a 12-inch woofer, MP3 player, Bluetooth receiver, and recording capabilities. Below is an image of the speaker and its remote control.

Figure 4.1: Front view of the Karma RDM 12A speaker and its accompanying remote control. The speaker features a large grille covering the woofer and a horn-loaded tweeter above it. A handle is visible on the left side. The remote control, positioned to the lower right, has various buttons for playback, mode selection, EQ, and numerical input.
4.1 Front Panel Features
- Woofer: 12-inch low-frequency driver.
- Tweeter: High-frequency horn driver.
- Grille: Protective metal mesh covering the drivers.
- Handles: Integrated handles for portability.
4.2 Rear Panel Features (Typical)
While not shown in the provided image, the rear panel typically includes:
- Power Input: For connecting the power cable.
- Power Switch: To turn the unit on/off.
- USB Port: For MP3 playback and recording.
- Microphone Inputs: For connecting microphones.
- Instrument Inputs: For connecting musical instruments.
- Line Input/Output: For connecting external audio sources or linking to other speakers.
- Volume Controls: Master volume, microphone volume, instrument volume.
- EQ Controls: Bass and Treble adjustments.
- Display Screen: For showing mode, track information, etc.
- Control Buttons: Play/Pause, Next/Previous, Mode, Record (REC).
4.3 Remote Control Functions
The remote control provides convenient access to various functions:
- REC: Start/stop recording to USB.
- MODE: Switch between input modes (Bluetooth, USB, Line In).
- EQ: Select equalization presets.
- Play/Pause, Next/Previous: Media playback controls.
- Number Buttons: Direct track selection (for USB/SD).
5. Setup
5.1 Initial Placement
Place the speaker on a stable, flat surface or a compatible speaker stand. Ensure adequate ventilation around the unit.
5.2 Power Connection
- Ensure the speaker's power switch is in the OFF position.
- Connect the power cable to the speaker's power input.
- Plug the other end of the power cable into a suitable AC power outlet.
5.3 Connecting Audio Sources
- Microphones/Instruments: Connect your microphones or instruments to the respective input jacks on the rear panel.
- External Audio Devices (Line In): Use an appropriate audio cable to connect devices like CD players or mixers to the Line Input.
6. Operating Instructions
6.1 Powering On/Off
Flip the power switch on the rear panel to the "ON" position to power on the speaker. The display will illuminate. To power off, flip the switch to "OFF".
6.2 Bluetooth Pairing
- Turn on the speaker.
- Press the "MODE" button on the speaker or remote control until "BLUETOOTH" or "BT" appears on the display. The speaker will enter pairing mode, indicated by a flashing Bluetooth icon or audible prompt.
- On your Bluetooth-enabled device (smartphone, tablet, etc.), enable Bluetooth and search for available devices.
- Select "Karma RDM 12A" (or similar name) from the list.
- Once paired, the speaker will confirm with an audible tone or a solid Bluetooth icon. You can now play audio from your device.
6.3 MP3 Playback (USB)
- Insert a USB flash drive containing MP3 audio files into the USB port.
- The speaker should automatically switch to USB mode and begin playing. If not, press the "MODE" button to select USB mode.
- Use the Play/Pause, Next/Previous buttons on the speaker or remote to control playback.
6.4 Recording Function
The speaker allows recording audio from microphone and instrument inputs directly to a USB flash drive.
- Ensure a USB flash drive is inserted.
- Connect your microphone(s) or instrument(s) and adjust their volume levels.
- Press the "REC" button on the remote control or speaker. The display will indicate recording is active.
- Press "REC" again to stop recording. The recorded file will be saved on the USB drive.
6.5 Adjusting Volume and EQ
Use the master volume knob to control the overall output level. Separate volume controls may be available for microphones and instruments. Use the "EQ" button on the remote or dedicated knobs (if present) to adjust bass and treble for desired sound quality.
7. Maintenance
7.1 Cleaning
Wipe the speaker's exterior with a soft, dry cloth. Do not use abrasive cleaners or solvents. Ensure no liquids enter the speaker's openings.
7.2 Storage
When not in use for extended periods, store the speaker in a cool, dry place, away from direct sunlight and extreme temperatures.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No power | Power cable not connected; Power outlet faulty; Power switch off. | Check power cable connection; Try a different outlet; Ensure power switch is ON. |
| No sound output | Volume too low; Incorrect input mode selected; Audio source issue. | Increase master volume; Press MODE to select correct input; Check audio source device. |
| Bluetooth not pairing | Speaker not in pairing mode; Device too far; Interference. | Ensure speaker is in BT pairing mode; Move device closer; Turn off other BT devices. |
| USB playback issues | Unsupported file format; USB drive faulty; USB drive not inserted correctly. | Ensure files are MP3; Try a different USB drive; Reinsert USB drive. |
9. Specifications
| Feature | Detail |
|---|---|
| Model Number | RDM 12A |
| Brand | Karma |
| Speaker Type | Amplified, Boomer |
| Woofer Size | 12 inches (implied from model name) |
| Connectivity Technology | Bluetooth, USB |
| Maximum Speaker Output Power | 350 Watts |
| Impedance | 4 ohms |
| Item Weight | 13 Kilograms |
| Package Dimensions | 63 x 41 x 33.5 cm |
10. Warranty and Support
This product comes with a standard manufacturer's warranty. For detailed warranty information, please refer to the warranty card included in your package or contact Karma customer support. For technical assistance or service inquiries, please contact your local dealer or the manufacturer directly.
Please note: Specifications are subject to change without notice.





