212/SX - Subwoofer REL Acoustics - Free user manual and instructions
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| Product Type | Active subwoofer |
| Brand | REL Acoustics |
| Model | 212/SX |
| Dimensions (W x D x H) | 500 x 400 x 450 mm |
| Weight | 30 kg |
| Power supply | 230 V / 50 Hz, 1000 W |
| Amplifier power | 1000 W RMS |
| Driver | 12 inch (300 mm) with carbon fiber cone |
| Frequency response | 20 Hz - 120 Hz |
| Main functions | Volume, phase (0-180°), variable crossover control, Hi-Level and Low-Level input, auto standby mode |
| Inputs | Hi-Level (Neutrik Speakon), Low-Level (RCA), LFE (RCA) |
| Outputs | Hi-Level Loop (Neutrik Speakon) |
| Cabinet material | High-density MDF with lacquered finish |
| Maintenance and cleaning | Dust with a soft dry cloth. Do not use chemical products. |
| Safety | Thermal and electronic short-circuit protection. Unplug before cleaning. |
| Spare parts and repairability | Contact REL customer service or an authorized dealer for replacement parts. |
| Included accessories | Power cable, Hi-Level cable (Neutrik Speakon), RCA cable, damping feet, user manual |
| Warranty | 2 years (parts and labor) |
| General information | High-end subwoofer designed for precise musical integration in Hi-Fi and Home Cinema systems. |
Frequently Asked Questions - 212/SX REL Acoustics
Where to place the 212/SX subwoofer in a room?
Place it in a corner or along a wall to reinforce bass frequencies. Avoid obstructions. Adjust the position for a balanced sound. Use the phase function to synchronize with the main speakers.
How to connect the 212/SX to a Hi-Fi amplifier?
Use the provided Hi-Level input (Neutrik Speakon): connect the amplifier terminals to the subwoofer terminals (L/R). For a Home Cinema system, use the LFE output of the amplifier via an RCA cable on the LFE input.
What is the optimal phase setting?
Adjust the phase while listening to music. Select 0° or 180° depending on the subwoofer position. The optimal setting is where the sound is most coherent and integrated.
How to adjust the crossover frequency?
Adjust the crossover according to your speakers. If your speakers go down to 50 Hz, set the crossover between 40 and 60 Hz. For a Home Cinema system, set the crossover to 80 Hz or follow your receiver's recommendations.
Why is the subwoofer not producing sound?
Check the connections, power supply, and volume level. Ensure that standby mode is not activated (the subwoofer goes into standby after 10 minutes without signal). Test with a known source. If the problem persists, contact technical support.
How to clean the subwoofer?
Dust with a soft, dry cloth. Never use liquid or abrasive products. Keep the vents and driver clean. Unplug the device before cleaning.
What to do in case of overheating?
The subwoofer is thermally protected: if the amplifier overheats, it automatically shuts off. Let it cool for 30 minutes, reduce the volume, and ensure sufficient ventilation around the device. If the problem recurs, contact an authorized repairer.
Can I use the 212/SX with bookshelf speakers?
Yes, the 212/SX integrates perfectly with bookshelf speakers thanks to its Hi-Level input. Use the Speakon cable to connect the subwoofer to the amplifier terminals. Adjust the crossover to complement the speakers' bass.
How to activate the auto standby mode?
The standby mode is enabled by default. The subwoofer enters standby after approximately 10 minutes without audio signal. To reactivate it, send an audio signal. If you want to disable this function, refer to the manual or contact support.
The subwoofer emits a hum, what to do?
Check the ground connections: use the Hi-Level input to avoid ground loops. Plug all devices into the same power outlet. If the humming persists, install a power filter or a ground adapter.
User questions about 212/SX REL Acoustics
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USER MANUAL 212/SX REL Acoustics
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Product information
Brand : REL Acoustics
Model : 212/SX
Category : Subwoofer