What are the precautions for installing on-board power amplifier?
In order to improve the sound effect of the car, many people choose to buy and install the car audio system, but installing the power amplifier requires more skills than installing the receiver or speaker, it can reduce the probability of failure of the car audio system in the future. It is best not to install the wiring privately, beware of accidents. The best way is to find a professional store to install. Installation, Step 1: Prepare the power amplifier and the receiver must maintain a distance of at least to avoid electrical system interference. At the same time, power amplifier will adversely affect the receiving effect of receiver AM/FM. If power amplifier is installed on the side door, care should be taken to keep the radiator in a vertical state. There should be enough space around for wiring and adjustment. Suitable for installation: under the seat, advantages: because it is close to the receiver, short wire can be used to avoid noise influence and signal weakening. At the same time, because it is close to the front speaker, it is easier to connect the horn line and does not occupy the space for storing luggage. Disadvantages: The seat has to be removed and installed. The large amplifier is not suitable. The power amplifier must also be overhead to prevent the rain from entering the compartment from wetting the amplifier. Fire Board (Side of the passenger seat) Advantages: shorter wire can also be used without removing the seat. Disadvantages: it is suitable for compact power amplifier and is close to the noise source. Inside the suitcase, advantages: there is enough space to install large power amplifier, which is close to the rear speaker. Disadvantages: part of the storage space will be sacrificed and The Wire used will be longer. Step 2: install the power amplifier first, then mark the landing position of the foot of the power amplifier mounting bracket, cut the hole for the mounting bolt, and then install the power amplifier, and make sure the bolt is tightened to ensure safety. When drilling holes, be careful not to pierce the oil supply pipe or brake oil pipe. If power amplifier is installed in the trunk, be careful not to pierce the fuel tank. Power amplifier itself should not be in direct contact with the chassis, otherwise noise will be generated, and rubber can be placed at the foot of the bracket during installation. Step 3: Wiring. Before wiring, disconnect the negative battery wire. Wiring is required for power supply, input and output. Most amplifier manufacturers do not * provide wires, but these wires are easy to buy. Connect the power cord: the power cord leads from the vehicle battery to the power amplifier, and the power cord is as thick as possible. A fuse or circuit breaker must be installed near the battery, otherwise an electrical short circuit will cause a fire and damage the amplifier. Connect the power cord to the positive pole of the battery and then connect it to the power amplifier through the inside of the vehicle. For hidden wires, the exit threshold can be removed. The grounding wire must be in contact with bare metal on the chassis of the vehicle. Connect input signal line: If the receiver has RCA front-stage output terminal and power amplifier has front-stage input terminal, the two can be connected through RCA terminal signal line. The level of the previous output signal is determined by the manufacturer, so it is necessary to confirm that the power amplifier input is equal to the output level of the receiver. If the receiver does not have a RCA front-stage signal output terminal, power amplifier can directly obtain the signal from the receiver speaker output terminal. At this point, the wire is led out from the receiver speaker output terminal and connected to the power amplifier high level input terminal. Connect the output signal line: Drive the speaker to connect the speaker to the power amplifier with a horn line. If you upgrade on the original system and do not want to re-wire, you can directly use the original horn line. Some power amplifier have a front-stage signal output function, which can send the front-stage amplification signal to other power amplifier through RCA signal lines, and can establish a multi-power amplifier system. After adjusting and reconnecting the negative battery wire, you can start testing power amplifier. Turn on the power and turn on the radio. power amplifier should start working to hear the sound from the speaker. At this time, adjustments can be made. To improve signal clarity, the power amplifier input sensitivity can be adjusted to a minimum. Play a tape or CD disc and turn up the receiver volume. If it is distorted, the volume can be reduced until the distortion disappears. At this time, the system signal-to-noise ratio is optimal, and engine noise interference can also be avoided. Keep this volume and then increase the power amplifier gain. If distortion occurs, the gain can be gradually lowered until distortion disappears. Common fault phenomenon: no sound. Exclusion Method: adjust the gain correctly; Check if the fuse and wiring are open; Input the signal directly from the receiver to the Speaker to confirm that the speaker is working properly. Failure phenomenon: the speaker basin vibrates more than ever. Exclusion Method: ensure that the power supply and grounding wire of power amplifier are firm; Ensure that the positive and negative poles of the speaker are not in direct contact; Check that any wiring should be free; Replace the wire. Fault phenomenon: only one channel has sound. Exclusion Method: confirm that the receiver balance switch is in the middle position; Confirm that the signal line is firmly connected; Change the left and right channel signal lines to confirm that the inside of the signal lines is not broken; Check whether the horn line is properly connected; Input the signal directly from the receiver to the Speaker to confirm that the speaker is working properly. Failure phenomenon: the output volume is weak or the sound is distorted. Exclusion method: Check whether the input sensitivity setting is correct and whether the receiver balance switch is in the middle position; Confirm that the signal line is firmly connected; Check whether the receiver and power amplifier are grounded and whether the two ends of the horn line are firmly connected; Replace the signal line; Input the signal directly from the receiver to the Speaker to confirm that the speaker is working properly; Confirm that the speaker phase is correct. Failure phenomenon: power amplifier is automatically cut off at high volume. Exclusion method: Check whether the input sensitivity setting is too high, whether the ventilation around the power amplifier is good, whether the bass control is in the maximum state, and whether the loudness switch is always on; Confirm that power amplifier is reliable in grounding; Use thick power cord; If the load is 2Ω, confirm whether the power amplifier is affordable.