The DI box is a device that can be seen frequently on a stage in a studio or professional scene. It is used to connect a high impedance unbalanced line output signal to a low impedance microphone balanced input. High impedance unbalanced lines? The popular point is that the cable impedance used when your electric guitar is connected to the mixer is too high, and the signal like the antenna is received, and the signal to the table is full. Especially when the cable is too long.
â–² Noise problems caused by unbalanced line transmission
How can I improve the DI box?
The DI box transmits your signal with a reverse signal, and finally the reverse signal is turned back, superimposed with your original signal, and your signal is enhanced. In addition, the noise signal generated during transmission is reversed. After superimposing, it will be offset!
In other words, the use of the DI box allows the instrument's signal to be perfectly matched to the mixer or sound reinforcement device without losing the signal of the instrument itself, so that the sound of the instrument itself is fully reflected. The most intuitive feeling after using DI is that you will find that the sound is not so boring before, the intuitive feeling is similar to the volume is also a lot bigger (in fact, the dynamic increase), the sound is more full and complete, the noise is not there! Just ask if your DI box is not important? !
Classification of DI Boxes <br> From the circuit point of view, it can be roughly divided into active and passive types.
The most obvious difference is that passive (passive) DI boxes do not need to be powered. Active (active) DI boxes require power, usually external power or phantom power through an XLR jack.
Passive (passive) DI boxes are basically just a transformer that contains a transformer to perform impedance matching and balancing, and has level isolation, and rarely has other functions. The strength and impedance of the signal to the transformer depends on the sound pickup system of the instrument itself. This can be a disadvantage. If your source signal is particularly weak or very low impedance, this DI can't do anything to improve the signal. However, it also has the advantage of passive design, no noise entry, no need to consider power, and in some cases the ideal sound from the transformer.
The active (active) DI box includes a preamplifier to provide a stronger signal and higher input impedance. This means it can handle subordinate signals and sounds so they remain good. Moreover, active (active) DI can be designed to be very quiet, high fidelity, clean and transparent sound.
The production of the DI box and its history The first time in the United States in the mid-1960s, the passive DI box appeared, using the recording studios of the major radio stations at that time. These passive DIs were designed by an engineer named Ed Wolfrum and a music performance company at the time to coordinate the design of some audio companies to solve the amplification problem of some electronic musical instruments. Especially musical instruments such as electric guitars. These boxes usually contain an audio transformer (such as the 1974 Trinity A11J) coil with a turns ratio of approximately 8:1 to 12:1, which results in an impedance ratio of around 144:1. This type of transformer converts the signal level to a lower output voltage to accommodate the typical microphone preamplifier.
In 1975, a DI box for 48 volt phantom power was designed for Leon Russell's studio, and its circuit was published in the "dB" sound engineering magazine. Tycobrahe Audio, which designs this DI box, is known for supporting large rock festivals such as California's Jam. In 1977 they began selling a trial version of the DI box that would increase the 9dBm output line level. This product has an embedded attenuator to accommodate a wide range of input levels.
Use of the DI box If you have a simple DI box in your hand, you can place it in most places in the entire sound reinforcement system. For example, you can place such a DI at the front of the effect chain. The effect chain is finally placed, which is the two most common ways we do.
â–² Two common ways of using DI boxes
Usually use an DI box to connect an electric guitar or electric bass to the microphone input of the mixer.
Some instrument amps have built-in DI units that can be connected directly to a mixing console without the need for an external DI box. This is an ideal setting for those who want to replay the instrument sound through the PA system while still wanting to maintain the sound characteristics of the preamplifier. Some instrumentation amplifiers can turn off the amplifier EQ with the pre EQ/post EQ switch.
The following section gives the audio engineer and bass player a look, haha!
It is common to use the DI box and microphone to pick up the same signal at the same time. One method is to connect a guitar amplifier output to the DI box, then to a channel in the mixing console, and then use the microphone to pick up the guitar speaker signal and send it to another channel of the mixing console. Another method is to connect a DI box between the guitar and the amplifier. The DI signal and the microphone signal can be selectively mixed. In general, in the live amplification process, this method will be more for Bass. There may be separate Bass DI and Bass Mic channels on the mixer. The DI provides more direct, realistic, bright and unbalanced sound, while the microphone provides a more in-stream appeal with amplifying and horn-like sound.
It is even possible to place the bass speakers in a specific environment and use the microphone to pick up some ambient sounds for special effects. But be careful: because the same Bass signal is sent to the mixer input through two channels, there is a phase difference between the two signals.
AC wall 5V 2A power adapter with multiple tips works for many small 5V electronics. Like Scanner, Router, Bluetooth speaker, Foscam Wireless IP Camera, CCTV camera, USB hub, bluetooth GPS Receiver, tv box, tablets, Baby Monitor, Graco Swing, Home Phone System, VoIP Telephone Routers, Serato DJ Controller, DVR, ADSL Cat, External battery, hubs, switches, Led Strip, String Lights, vibrator, Raspberry pi 3 Raspberry Pi A/A+/B/B+ Raspberry Pi Zero and more 5V devices. (5V ONLY)
Worldwide Input: 110-240V; Output: 5V 1000mA, 1.5A, 1.75A, 5V 1A, 5V 500mA, 5V 2.1A, Max 10W. DC Tip Polarity: Central Positive(+). Please read manual carefully before using 5vdc power supply.
Design-safeguard features against incorrect voltage, short circuit, internal overheating and overloading. This 5v Ac power supply charger is made from quality material to ensure the long lifetime. Power your 5v electronics perfectly and replaces lots of 5 volt power chargers
Package include: 1 x High Quality 5V 2A AC DC Power Adapter, 1 Set x Tips
5V Switching wall charger 6V Switching wall charger 9V Switching wall charger 12V Switching wall charger 15V Switching wall charger 19V Switching wall charger 24V Switching wall charger 36V Switching wall charger 48V Switching wall charger
Shenzhen Waweis Technology Co., Ltd. , https://www.szwaweischarger.com