Audiocenter MA12 MA series cabinets are molded and made from a new type of polypropylene composite material. They are one-piece molded, strong and wear-resistant, and can suppress vibration even under high dynamics. The cabinet structure has been carefully tested and developed to achieve the ultimate acoustic performance, providing clear, delicate and smooth sound. 1. PROTECT indicatorThe indicator is on when the system detects abnormal of the speaker and starts protection mode.2. LIMITER indicatorThe indicator is on when output limiter is activated. If the output voltage of the amplifier exceedsthe maximum value, output limiter will be activated, lower the output signal of the amplifier.3. SIGNAL indicatorThe indicator is on when the input signal is detected.4. POWER indicatorThe indicator is on when speaker is connected to power.5. FRONT LED DISABLE switchSwitch on and the front panel LED indicator is on (operating mode: blue; standby mode: red);Switch off when the front panel LED indicator is unneeded.6. BLUETOOTH indicator- When the indicator is off, it indicates no connection to any Bluetooth devices(for example, mobile phone);- When the light is on,it indicates that the speaker has been successfully connected to Bluetoothdevices (for example, mobile phone);- When the light is flashing (1 time in 1 sec), it indicates that the speaker is ready for Bluetoothpairing with a device (for example, mobile phone).- When the light is flashing (3times in 1 sec), it indicates that the speaker is in Bluetoothspeaker-to-speaker pairing mode (for the first time two speakers work as a pair theyneed to match each other).- Remark: The speaker-to-speaker pairing means two MA speakers can work as a pair(by Bluetooth) and connect to the same Bluetooth source (for example, mobile phone).7. BLUETOOTH PAIR pairing buttonIf you want to connect speaker to a Bluetooth source (for example, a mobile phone), first press“Bluetooth pair” button for 3 seconds (the indicator flashes 1 time in 1 second), and then choose“AC-MA”as the Bluetooth source to pair.If you want to pair two speakers for the first time, press “Bluetooth PAIR” button of bothspeakers for 5 seconds (Bluetooth indicator flashes 3 times in 1 second). The two speakerswill be paired automatically.8. LOW SHELF 100Hz LF controlThis is a low shelf filter with 100Hz cut-off frequency. Turn the knob to reduce or boost the lowfrequency when signal frequency is lower than 100Hz.9. EQ parameter equalizerThis is a Peaking Filter, used together with GAIN knob and FREQ knob.10. FREQ: center frequency 160Hz, 320Hz, 630Hz, 1KHz, 1.6KHz, 2.5KHz, 4KHz, 6.3KHz, 8KHzoptional. GAIN: reduce or boost the selected central frequency signal.11. HIGH SHELF 10KHz HF controlThis is a High Shelf Filter with 10kHz cut-off frequency. Turn the knob to reduce or boostthe highfrequency when signal frequency is higher than 10KHz.12. GAIN A controlUse GAIN A knob to control gain of input signal from LINE A/MIC. GAIN A can adjust the sensitivityand thus control the volume of signal sent to the amplifier and then to the speaker.13. GAIN B controlUse GAIN B knob to control gain of input signal from LINE B. GAIN B can adjust the sensitivity andthus control the volume of signal sent to the amplifier and then to the speaker.14. GAIN C/D controlUse GAIN C/D knob to control gain of input signal from BLUETOOTH C/D and AUX. GAIN C/Dcan adjust the sensitivity and thus control the volume of signal sent to the amplifier and thento the speaker.15. LINE/MIC switchAccording to the level of the input signal, set the LINE/MIC switch to LINE or MIC. For low-levelsignals (such as microphones), switch to the MIC position (upwards); for high-level signals (suchas electroacoustic instruments and audio equipment), switch to the LINE position (downwards).Generally, when the microphone is not in use, the switch should be at LINE.16. INPUTS socket(LINE A/ MIC)Balanced XLR and PHONE type multi-purpose input socket.17. INPUTS socket(LINE B)Balanced XLR and PHONE type multi-purpose input socket.18. INPUTS socket(AUX)3.5mm input socket.18. INPUTS socket(AUX)3.5mm input socket.19. OUTPUTS socket(MIX OUT)Balanced XLR output socket. Balance the mixed output signal (able to mix and integrate the signalsof all channels).20. LOW CUT 80Hz switchSet cut-off frequency of the high pass filter at 80Hz, the filter will eliminate the frequency lower than80Hz. Press the switch and activate the function of filter.
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