A-TECH MA800 Installation Manual - Page 7

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2）If you use a power amplifier, you can directly use the USB port of the power amplifier to power

the microphone without a USB socket.

4.4.5 Switch Installation

You can choose a single switch panel, install it on the side of the door or on the side of the blackboard,

and affix a label, which is easy for the teacher to open and close.

Pay Attention to the Problem

1. Howling problem occurs when starting: The slight howling at the beginning is normal. When the

device is just started, it needs to learn the on-site sound field environment, there will be a slight

whistling phenomenon for a short time, and it will be automatically after a few seconds of learning.

stop.

2. Continuous howling problem: First rule out whether the speaker is too close to the microphone, and

whether the distance exceeds 3 meters. Then check whether the speaker volume is too loud, and try

to lower the volume. The volume can be adjusted according to the on-site environment to meet the

needs. The loudspeaker volume is too large, firstly, it will damage the students' hearing, and secondly,

it is easy to produce howling.

3. Low and unclear sound problem: Check the power amplifier or speaker EQ adjustment, you can

reduce the bass part of the speaker.

4. No sound problem: No sound problem can be checked according to the following steps:

Step 1: Check whether the indicator light on the microphone panel is on. If it is not on, it means it

has not started. Check whether the power supply cable is normal.

Step 2: Confirm whether the speaker is powered on and the volume is turned on.

Step 3: Check whether the audio output is connected to SPK-OUT. If it is connected correctly, unplug

the 3.5mm audio cable from the microphone and connect it to the mobile phone to play sound, and

check whether the cable is normal.

Step 4: If there is no problem in the above steps, you can change the microphone and test again.