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This document describes the Blaupunkt BEA 108, a four-channel equalizer with amplifier designed for car audio systems. It can be connected to all car radios without an integrated booster/amplifier.
The BEA 108 is a car equalizer and amplifier that allows users to fine-tune the audio output of their car stereo system. Its primary function is to adjust the frequency response of the audio signal, enhancing sound quality and tailoring it to personal preferences. The device features seven frequency control knobs, allowing for precise adjustments across the audio spectrum. It also includes a fader control for balancing the front and rear speakers, and separate level indicators for left and right channels. The equalizer automatically switches on and off with the car radio, ensuring seamless integration into the vehicle's electrical system.
A notable feature is its integration with ARI units (Automatic Radio Information). When connected to an ARI unit, the equalizer can automatically reduce the music volume for traffic announcements and then restore it once the announcement is over. This ensures that important traffic information is always audible without requiring manual adjustment.
The BEA 108 is a four-channel equalizer, meaning it can process and amplify audio for four distinct speaker outputs. The frequency control knobs allow for adjustments at the following frequencies: 60 Hz, 150 Hz, 400 Hz, 1000 Hz, 2500 Hz, 6300 Hz, and 16000 Hz. Each of these frequencies can be boosted or cut by up to 12 dB, providing a wide range of sound customization options. The equalizer also features a 0 dB center position for each frequency control, indicating a neutral setting.
The device includes level indicators for both left and right channels, which illuminate to show the current audio level. These indicators help users visualize the intensity of the audio signal. The equalizer operates on a +12V power supply, typical for car audio systems. It includes connections for pre-amp input, speaker outputs (front left, front right, rear left, rear right), and a control lead for automatic switching with the car radio. The output section of the circuit diagram shows connections for LF (Left Front), LR (Left Rear), RF (Right Front), and RR (Right Rear) channels, each with its own amplifier stage.
Adjusting the Equalizer: To begin, all frequency control knobs should be set to the center position (0 dB). The equalizer is activated when the car radio is switched on. The indicators next to the frequency controls will light up.
Frequency Control: The seven frequency control knobs allow for boosting or lowering the individual frequencies. For example, the 60 Hz control is used for bass reproduction, while the 16000 Hz control affects treble. Adjusting these controls allows users to compensate for acoustic conditions in their car and achieve their desired sound. Each frequency can be raised or lowered by up to 12 dB. For optimal sound, it is recommended to adjust the 60 Hz control for bass reproduction, the 150 Hz and 400 Hz controls for improved mid-range reproduction, the 6300 Hz control for treble, and the 16000 Hz control for brilliant treble. The 1000 Hz and 2500 Hz controls are used for overall acoustic balance. After making adjustments, repeating the process for all 7 frequencies and then fine-tuning can lead to significant improvements in sound quality.
Fader Control: The fader control is used to set the front/rear volume balance. To increase the volume of the front speakers, the fader should be moved fully in the direction of the "front speakers" indicator. Conversely, to increase the volume of the rear speakers, it should be moved towards the "rear speakers" indicator.
Level Indicators: The BEA 108 features level indicators for the left and right channels. These indicators light up to show the current audio level, helping users monitor the signal strength.
Equalizer Button: The equalizer button, when pressed, switches the equalizer function on or off. When the equalizer is active, the indicators in the control knobs of the frequency controls will light up.
Automatic Switching: The equalizer automatically switches on and off with the car radio, eliminating the need for manual power control. This ensures that the equalizer is always active when the car radio is in use.
ARI Integration: When connected to an ARI unit, the equalizer automatically reduces the music volume during traffic announcements. This feature ensures that important traffic information is clearly audible. After the announcement, the music volume is automatically restored to its previous level.
The manual provides a circuit diagram (page 12) and fitting instructions (page 13), which are crucial for maintenance and installation.
Installation: The fitting instructions detail how to connect the BEA 108 to the car radio and speakers. It includes connections for the pre-amp input from the car radio, speaker outputs to the front and rear speakers, and the +12V power supply. Proper installation is essential for the device's optimal performance and longevity. The diagram shows how to connect the input signal from the car radio's pre-amp output to the equalizer's input. The equalizer's amplified outputs are then connected to the respective speakers (LF, LR, RF, RR). A control lead from the car radio ensures that the equalizer switches on and off automatically.
Circuit Diagram: The circuit diagram provides a detailed view of the internal components and connections, which is invaluable for troubleshooting and repair. It shows the input stage, the equalizer section with its seven frequency bands, and the four-channel amplifier output stage. Understanding this diagram can help technicians diagnose issues and replace faulty components if necessary. The diagram also indicates various integrated circuits (e.g., V100, V200, V201, V202, V300, V301, V302, V303) and other components like resistors, capacitors, and diodes, which are standard in audio electronics.
General Maintenance: As with most car audio components, regular checks of connections for corrosion or looseness can prevent common issues. Keeping the unit free from dust and moisture is also advisable. Given its robust design for in-car use, the BEA 108 is likely designed for minimal user maintenance beyond proper installation. Any complex repairs would typically require a qualified technician familiar with car audio electronics and the provided circuit diagrams.
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