Pickup installation

1. Selection of Pickup Locations Pickups can be mounted on the ceiling or wall. The pickup location should be as close as possible to the main talking area. For example, the interrogation room may be installed near the person being tried; the classroom may be installed near the podium; and the small meeting room may be installed at the center of the ceiling. Installation principle: Try to get close to the main conversation area. This kind of pick-up effect is better.

2. Selection and Wiring of Pickup Cables Installation of the microphones Considering the complex construction environment, it is recommended to use a 0.5mm2 cross-section 3-core signal cable. That is commonly used 3 × 0.5 RVVP cable, as shown in the following figure: pickup power supply is generally used remote centralized power supply (ie centralized power supply in the audio recording equipment / amplification equipment side), the use of the three-core cable, respectively, for the power cord, Audio signal lines, public grounds. Shielded cables can be used in electromagnetic complex environments where the shielding layer is connected to the equipment ground. That is, the shielding net connected to one end of the pickup is suspended, and the shielding net connected to one end of the audio equipment is connected to the equipment ground (chassis). Note: It is best to route the cables separately. Do not use the same cable tray with strong AC power, and try to keep away from strong electromagnetic interference devices such as transformers and luminaire rectifiers.

3, the connection method of the pickup power cord positive power pickup power supply method requires the use of remote centralized power supply (that is, in the audio recording equipment side / amplification equipment centralized power supply), its main purpose is to have stronger anti-jamming and noise capabilities. It is recommended to use the 15 V DC regulated high-quality power supply provided by our pickup adapter (see the instructions for use of the pickup adapter below) to avoid degradation of sound quality due to dirty power supply.
This series of pickups can use 8V-20V wide-range DC power supply, DC12V is recommended. If the power line is greater than 300 meters, due to the line loss generated by the voltage drop, it is recommended to use 15V-DC power supply.
Since the pickup is a very sensitive small-signal amplification device, it is sensitive to the clutter of the power supply, and it is necessary to use a clean, high-quality DC stabilized power supply with a small amount of clutter. A single pickup consumes about 10-30 milliamps of current, which means a nominally 1 amp DC regulated power supply can operate at least 10 pickups at the same time. The power supply efficiency and line loss should be taken into consideration in the application. Try to use a power supply with a higher nominal value. The DC stabilized power supply referred to here is often referred to as a "transformer." It is generally composed of a power transformer, a rectifier diode, a filter capacitor, and an integrated voltage regulator. Can not use switching power supply, it may introduce a lot of circuit noise to the pickup!

4. The common ground connection of the pickup power supply negative and the audio ground wire The pickup audio ground wire and the power supply negative electrode are combined into one and must receive the negative pole of the DC stabilized power supply and the ground line of the audio input (Line In) of the audio equipment at the same time. As shown below:
If the power ground and audio ground are not well connected, the sound quality will be degraded or there will be no sound. If the ground of the Line In terminal of the audio equipment is not connected to the ground of the pickup, the sound will generally be very small.

5, pickup audio cable connection pickup audio signal line and audio ground can be directly connected to the device: Acoustic headphones, active speakers, audio amplifier, audio and video distributor, DVR hard disk recorders, video servers, mixers, tape recorders Line In linear input for a sound card or other audio device (microphone connection is strictly prohibited).

1, hard disk recorders. Most hard disk video recorders have corresponding audio input ports, which are generally coaxial cable BNC plugs. The pickup audio cable needs to be connected to the center pin position of the BNC plug. The pickup needs to be connected to the BNC plug's enclosure (that is, the shielded copper net connected to the coaxial cable) in common, and the self-powered active speaker. A set of ordinary active speakers are generally left and right, corresponding to the left and right audio channels, respectively. This pickup only provides one sound source, so it is a “monophonic” sound source. The audio cable of the pickup is connected to the left/right audio cable of the speaker cable, and the pickup is connected to the ground of the speaker cable in common. 3, other audio equipment such as amplifiers, mixing consoles and other methods of connection are the same. 4. It is forbidden to connect the pickups to the microphone (MIC) input terminals of sound cards, mixers, amplifiers, etc. Otherwise, the equipment may be damaged. This is because the interior of the pickup includes a microphone, but it also includes circuits for amplification, noise reduction, echo processing, etc., and outputs a "Line Out" audio signal of 1 Vpp or more. 5. Notebook computers are rarely equipped with “Line In” audio input jacks, and generally only have MIC input jacks and SPEAKER output jacks. The pickup cannot directly access the MI C port. Only a professional external USB interface desktop sound card can be purchased. Use the “Line In” port to access it. 6. The pickup audio cable can not be directly connected to two kinds of audio devices. The pickup adapter must be connected to avoid deterioration of the sound quality that may be caused due to impedance mismatch. Note: During all connections or toggle switches, adjust the volume of your amplifier to a minimum to avoid momentary electrical shock.

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