Magnat Betasub 20A Active Downfire Home Cinema Subwoofer User Manual

1. Product Overview

The Magnat Betasub 20A is a high-performance active bass-reflex subwoofer designed to enhance your home cinema audio experience with deep and powerful bass. Featuring a 200mm long-throw woofer and a 140-watt high-performance amplifier, this compact unit delivers impressive low-frequency reproduction. Its unique downfire enclosure construction ensures precise and controlled bass output.

Key Features

• Deep Bass Specialist: Downfire construction for precise and powerful bass in demanding home cinema scenes.
• Versatile: A perfect addition to any home cinema system.
• Powerful Amplifier: Driven by a 140-watt high-performance amplifier, covering a deep bass range from 25 Hz to 200 Hz, continuously adjustable between 50 Hz and 200 Hz.
• Controlled Bass: Membrane surface positioned at a small, precisely defined distance from the ground for controlled and acoustically optimized bass.
• Optimized Airflex Port: Driver supported by a 5-fold screwed Airflex bass-reflex port on the front.
• Adjustable Controls: Volume and crossover frequency are adjustable.
• Phase Switch: Switchable 0°-180°.
• Connectivity: High-level and low-level inputs.
• Automatic Stand-by: For energy efficiency.
• Voltage Selection: Mains voltage selectable 115/230 V.
• Real-time Limiter and LPC circuit: Protects from overload and ensures clear bass.
• Resonance-damping rubber feet: For stability and vibration reduction.

Figure 1: Front view of the Magnat Betasub 20A Active Downfire Subwoofer, showcasing its compact design and down-firing woofer.

2. Setup

Unpacking and Included Components

Carefully unpack your Magnat Betasub 20A subwoofer. Ensure all components are present before proceeding with the setup.

• Magnat Betasub 20A Subwoofer
• Rubber Spikes
• Power Cord
• User Manual (this document)

Placement

The Betasub 20A utilizes a "downfire" principle, where the woofer fires downwards towards the floor. This design helps in producing deep and powerful bass.

• Position the subwoofer on a stable, level surface.
• Use the included resonance-damping rubber feet to minimize vibrations and improve sound quality.
• Experiment with different placements within your room to find the optimal position for bass response. Corners often enhance bass, but can also lead to muddiness.
• Ensure adequate ventilation around the unit.

Connections

The Betasub 20A offers both high-level and low-level input options.

Low-Level Connection (RCA)

For receivers or amplifiers with a dedicated subwoofer output (LFE or Sub Out), use an RCA cable to connect this output to the "Low Level Input" on your subwoofer.

High-Level Connection

If your amplifier does not have a dedicated subwoofer output, you can connect the subwoofer using the high-level inputs. Connect the speaker outputs of your amplifier to the "High Level Input" terminals on the subwoofer. Then, connect your main speakers to the "High Level Output" terminals on the subwoofer. Ensure correct polarity (+ to + and - to -).

Power Connection

Before connecting to power, ensure the voltage selector switch (if present) is set to your local mains voltage (115V or 230V).

1. Connect the power cord to the subwoofer's power inlet.
2. Plug the other end of the power cord into a suitable wall outlet.
3. Turn on the main power switch located on the rear panel.

3. Operating Instructions

Initial Power On

After connecting the power, switch on the main power switch. The subwoofer will enter standby mode or become active, depending on the input signal.

Controls

Volume Control

Adjust the "Volume" knob to balance the subwoofer's output with your main speakers. Start with a low volume and gradually increase it.

Crossover Frequency Control

The "Crossover Frequency" knob allows you to set the upper frequency limit for the subwoofer, adjustable between 50 Hz and 200 Hz. This determines where the subwoofer takes over from your main speakers.

• If your main speakers are small, set the crossover higher (e.g., 80-120 Hz).
• If your main speakers are large and have good bass response, set the crossover lower (e.g., 50-80 Hz).
• Experiment to achieve a seamless transition between the subwoofer and your main speakers.

Phase Switch (0°/180°)

The "Phase" switch (0° or 180°) helps to ensure that the subwoofer's sound waves are in sync with your main speakers.

• Start with 0°.
• If the bass sounds weak or hollow, try switching to 180°. Choose the setting that provides the most impactful and coherent bass.

Automatic Stand-by

The subwoofer features an automatic stand-by function. If no audio signal is detected for a period, the subwoofer will automatically switch to a low-power stand-by mode. It will reactivate when an audio signal is detected.

Real-time Limiter and LPC Circuit

The integrated Real-time Limiter and LPC (Linear Phase Correction) circuit protect the subwoofer from overload and ensure clear, undistorted bass reproduction even at high volumes.

4. Maintenance

Cleaning

To clean the subwoofer, use a soft, dry cloth. Do not use abrasive cleaners, waxes, or solvents, as these can damage the cabinet finish.

General Care

• Avoid placing the subwoofer in direct sunlight or near heat sources.
• Ensure proper ventilation to prevent overheating.
• Do not expose the unit to moisture or extreme temperatures.
• If the subwoofer will not be used for an extended period, disconnect it from the power outlet.

5. Troubleshooting

If you experience issues with your Magnat Betasub 20A, refer to the following common problems and solutions.

No Sound

• Check Power: Ensure the power cord is securely connected and the main power switch is ON. Verify the wall outlet is functional.
• Check Connections: Confirm all audio cables (RCA or high-level) are correctly and securely connected to both the subwoofer and your amplifier/receiver.
• Source Signal: Ensure your amplifier/receiver is outputting a signal to the subwoofer. Check your receiver's settings.
• Volume: Increase the subwoofer's volume control.
• Automatic Stand-by: If the subwoofer is in stand-by, play some audio to see if it reactivates.

Distorted or Weak Bass

• Volume Level: Reduce the subwoofer's volume if the sound is distorted.
• Crossover Frequency: Adjust the "Crossover Frequency" knob. An incorrect setting can lead to weak or boomy bass.
• Phase Switch: Toggle the "Phase" switch between 0° and 180° to find the setting that provides the most coherent bass with your main speakers.
• Placement: Experiment with subwoofer placement. Moving it slightly can significantly impact bass quality.
• Source Material: Test with different audio sources to rule out issues with the content itself.

Subwoofer Does Not Enter Stand-by or Wakes Up Randomly

• Signal Level: Ensure the input signal level is appropriate. If the signal is too low, the auto-standby might not activate correctly. If there's constant low-level noise, it might prevent stand-by.
• Interference: Check for potential electrical interference from other devices.

6. Technical Specifications

7. Warranty Information

The Magnat Betasub 20A subwoofer comes with a limited warranty. For specific details regarding the warranty period, coverage, and terms and conditions, please refer to the warranty card included with your product or contact your local Magnat dealer or Magnat Audio Produkte GmbH directly. Keep your proof of purchase for warranty claims.

8. Customer Support

If you require further assistance, have questions not covered in this manual, or need technical support, please contact your authorized Magnat dealer or Magnat Audio Produkte GmbH customer service.

For the most up-to-date contact information and support resources, please visit the official Magnat website.