Amplifier function key diagram_Amplifier function

Amplifier function key diagram

The function of each button of the amplifier:

1.MIC1: Microphone 1, GA: Microphone 1 volume dimming potentiometer (also known as volume switch knob).

2.BASS: Bass potentiometer for microphone 1.

3.MID: Midrange potentiometer of microphone 1.

4.TRE: Treble potentiometer for microphone 1. The following will not be repeated.

5. INPUT: This is the sound source selection button. I am not sure what the following two buttons are for.

6. EFFECT: This is the microphone effect level knob, also known as the effect volume.

7.DEL: Delay of microphone effect.

8.REP: number of echoes.

The buttons of Pioneer 860 amplifier are as follows:

Performance indicators of power amplifier

The main performance indicators of a power amplifier include output power, frequency response, distortion, signal-to-noise ratio, output impedance, damping coefficient, etc.

Output power: The unit is W. Due to different measurement methods of different manufacturers, there are some different names, such as rated output power, maximum output power, music output power, and peak music output power.

Music power: refers to the instantaneous maximum output power of the amplifier for music signals under the condition that the output distortion does not exceed the specified value.

Peak power: refers to the maximum music power that an amplifier can output when the volume is adjusted to maximum without distortion.

Rated output power: The average output power when the harmonic distortion is 10%. Also known as the maximum useful power. Generally speaking, the peak power is greater than the music power, and the music power is greater than the rated power. Generally speaking, the peak power is 5-8 times the rated power.

Frequency response: Indicates the frequency range of the amplifier and the unevenness within the frequency range. The flatness of the frequency response curve is generally expressed in decibels [db]. The frequency response of a home HI-FI amplifier is generally 20HZ--20KHZ plus or minus 1db. The wider this range, the better. The frequency response of some top-quality amplifiers has reached 0--100KHZ.

Distortion: An ideal amplifier should amplify the input signal and faithfully restore it without any change. However, due to various reasons, the signal amplified by the amplifier is often distorted to varying degrees compared with the input signal. This distortion is distortion. Expressed as a percentage, the smaller the value, the better. The total distortion of a HI-FI amplifier is between 0.03% and 0.05%. The distortion of an amplifier includes harmonic distortion, intermodulation distortion, crossover distortion, clipping distortion, transient distortion, transient intermodulation distortion, etc.

Signal-to-noise ratio: refers to the ratio of the signal level to the noise level of the amplifier output, expressed in dB, the larger the value, the better. Generally, the signal-to-noise ratio of a home HI-FI amplifier is above 60db.

Output impedance: The equivalent internal resistance presented to the speaker is called output impedance.

The role of the amplifier

1. The power amplifier is called a "loudspeaker". Its function is to amplify the weak signal from the sound source or the pre-amplifier. It can be considered to promote the soundproofing of the speaker. You must know that if there is a good audio system, the power amplifier plays an indispensable role.

2. As for its function, it depends on the different components used. "IC amplifier" is rarely seen in HI-FI because its sound quality is not as good as the above two types of amplifiers. Here, let's briefly talk about the three categories of amplifiers: "professional amplifier", "civilian amplifier" and "special amplifier". "Professional amplifier" is more suitable for conferences, performances, halls, venues, and halls. However, the sound quality of most "professional amplifiers" is used for HI-FI playback, but the sound of this amplifier is dry and hard.