Customized High Quality Guitar Pedal Chassis Aluminum Pedal Enclosure

Many system engineers in the audio industry have some problems with how to correctly set the position of the volume knob for the professional power amplifier in the system. There are all kinds of theories. No matter what speakers, power amplifiers, mixers, and peripherals are configured in a system equipment, the volume knob of the final power amplifier is all turned to the maximum or a certain position that is used to. There are two problems with this setting: the first is that the security of the system has certain hidden dangers, and the second is that the overall signal-to-noise ratio of the system is reduced. Next, we use scientific calculation methods to measure and debug the system to ensure that the system not only meets the best use efficiency but also works in a very safe area.

The adjustment system should be divided into two steps. The first step is to correct the system voltage. The input and output terminals of all equipment in the sound reinforcement system link are corrected for voltage. The maximum input voltage of some processing equipment is less than the output voltage of the previous equipment, resulting in clipping distortion. Moreover, the power output voltage can be reasonably set to truly ensure the safety of the entire system. Step 2: Acoustic defect correction, which performs unified physical correction on the frequency response curve, high pass, low pass and delay of the system. The above two steps should be completely separated and cannot be mixed.

The most important parameters of the system are:

The meaning of the volume knob of the power amplifier: Take the POWER SOFT power amplifier as an example, the parameter name of the dB corresponding to the knob is called (voltage gain), and the voltage gain indicates the amplification ability of the amplifier circuit to the input signal, and the expression method used is the decibel notation. . The larger the dB value, the stronger the amplification ability, and vice versa. Its calculation formula is dB=20log (output voltage/input voltage).

All devices have dBu parameters. For example, the maximum input and output of the mixer is xx dBu, the maximum input and output of the digital audio processor is xx dBu, and the maximum input and output of the power amplifier is xx dBu. The name of dBu is the voltage level, which is determined by the voltage relationship. The level is called absolute voltage level, referred to as voltage level, and its calculation formula is dBu=20log(voltage/0.7746V), this parameter indicates the maximum undistorted input and output voltage that its device can provide. This parameter is very important for matching connections between devices. For example, the output voltage of the mixer is higher than the maximum input voltage of the audio processor, which will directly cause the audio signal to be distorted when it enters the audio processor.

To calculate the maximum input voltage of the speaker, the formula is V=√Power X impedance. Knowing the parameters of the speaker can calculate the maximum safe input voltage. This parameter is very important for the safety and stability of the speaker.

Correctly grasp the definition of various input interfaces of the mixer (balanced low-impedance input, XLR input interface, balanced high-impedance input, three-core 6.35 input interface, unbalanced high-impedance input, RCA lotus input interface) and various interfaces. Maximum input voltage level (high-impedance and low-impedance inputs have different amplification factors for signal voltage. For example, connecting the high-impedance line output level with a higher output voltage to the low-impedance XLR input of the mixer will How to attenuate the voltage gain, the signal is always in a state of clipping and distortion), first ensure that the signal source output signal interface type at the front end of the mixer is consistent with the input interface type of the mixer, and the maximum output voltage of the audio source device must conform to the mixer. within the voltage level range of the input.

Effector An electronic instrument designed to produce various effects. Its function is to change the waveform of original sound, modulate or delay the phase of sound wave, enhance the accretion component of sound wave and a series of measures to produce various special sound effects.

It is used in many Musical Instruments, choruses, etc., to exert an effect on timbre. Early electronic organs used reed rinsing devices to produce reverberation. Use a group of rotating loudspeaker and a group of fixed loudspeaker relative movement, produce cyclotron sound. An additional oscillator is used in the electronic circuit to modulate the audio signal to produce chatter. People extract these effect devices, improve and develop, made of reverberator, delay, phase shifter, frange, etc., used in electric guitar or other electric acoustic instruments to play rock and roll