RMA 12 - Subwoofer Roswell - Free user manual and instructions
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| Product type | Powered subwoofer |
| Brand | Roswell |
| Model | RMA 12 |
| Speaker driver | 12-inch (30 cm) cone driver |
| Enclosure type | Bass reflex (ported) |
| Power output (RMS) | 200 W |
| Peak power | 400 W |
| Frequency response | 25 Hz - 200 Hz |
| Impedance | 4 ohms |
| Connectivity | Line-level RCA input, speaker-level input, LFE input |
| Controls | Volume, crossover frequency (40-200 Hz), phase switch (0°/180°), power mode (On/Auto/Off) |
| Protection features | Overload, short circuit, thermal protection |
| Dimensions (H x W x D) | 420 x 400 x 420 mm (16.5 x 15.7 x 16.5 in) |
| Weight | 15 kg (33 lb) |
| Power supply | AC 110-240 V, 50/60 Hz |
| Standby power consumption | < 1 W |
| Finish | Black vinyl wrap |
| Placement | Floor standing, corner or wall placement recommended |
| Included accessories | Power cord, RCA cable, user manual |
| Recommended for | Home theater, music systems |
Frequently Asked Questions - RMA 12 Roswell
How do I connect the Roswell RMA 12 subwoofer to my AV receiver?
Use a subwoofer cable (RCA) from the subwoofer pre-out on your receiver to the LFE input on the subwoofer. Alternatively, use speaker-level input if no subwoofer output is available. Set the receiver to 'Small' for speakers and redirect bass to the subwoofer.
What is the ideal placement for the subwoofer?
Place the subwoofer in a corner or along a wall to enhance bass output. Avoid placing it directly against the wall to allow the port to breathe. Experiment with locations to minimize boominess and achieve even bass response.
How do I set the crossover frequency?
Set the crossover frequency knob to match your main speakers' capabilities. A typical starting point is 80 Hz. If your speakers are large, set lower (60 Hz); if small, set higher (100-120 Hz). Fine-tune by ear for a seamless blend.
What should I do if the subwoofer does not power on?
Check the power cord connection and ensure the outlet is working. Verify the power mode switch is set to 'On' or 'Auto'. If using 'Auto', ensure a signal is present. If still off, test with a different outlet or contact support.
Can I use the subwoofer with a two-channel stereo system without a subwoofer output?
Yes, connect using the speaker-level inputs. Run speaker wires from the amplifier to the subwoofer's speaker-level input terminals (left and right). Then connect from the subwoofer's output to your speakers. This uses the subwoofer's internal crossover.
What does the phase switch do and how should I set it?
The phase switch (0° or 180°) adjusts the timing of the subwoofer relative to the main speakers. Set it to the position that gives the strongest and most articulate bass at the listening position. Usually 0° is a safe starting point.
How do I clean and maintain the subwoofer?
Unplug the unit before cleaning. Wipe the cabinet with a soft, damp cloth. Do not use abrasive cleaners or solvents. Ensure the port and driver are free from dust. Check connections periodically for tightness.
What is the recommended amplifier power for this subwoofer?
The subwoofer is self-powered with 200W RMS, so no external amplifier is needed for the subwoofer itself. For the main speakers, any quality amplifier that matches your system is suitable.
The subwoofer makes a humming noise. What can I do?
Hum often comes from a ground loop. Try connecting the subwoofer and receiver to the same power strip. Use a ground loop isolator on the RCA cable. Ensure the cable is not damaged and the connections are tight.
How do I reset the subwoofer to factory settings?
This subwoofer does not have a factory reset feature. To restore default operation, set all knobs to mid-position (volume 50%, crossover 100 Hz, phase 0°). Power off, wait 30 seconds, then power on. Refer to manual for any specific reset procedure.
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