OQAN QDI-300 MONO - Passive Injection Box for Instrument
The OQAN QDI-300 MONO is a passive direct injection (DI) box designed to be an essential and reliable tool for both musicians and sound engineers. Its main function is to convert the high-impedance, unbalanced signal from instruments such as electric guitars, basses, or keyboards into a low-impedance, balanced signal. This allows these instruments to be connected directly to a mixing console, audio interface, or PA system over long cable distances without any loss of quality or unwanted noise.
Built with a robust metal chassis, the QDI-300 MONO is ready to withstand the demands of continuous use in recording studios and live tours. Its passive design means it requires no external power source, such as batteries or phantom power, making it a practical and easy-to-use plug-and-play device in any situation. Simply connect your instrument and you're ready for clean, professional sound.
Main features
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Passive Design: It does not require an external power supply, guaranteeing maximum reliability and ease of use.
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Versatile Inputs: Equipped with a 1/4 inch (6.35 mm) jack input for instrument and an XLR input, offering connection flexibility.
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Professional Balanced Output: It has a standard XLR output to send a clean, low impedance signal to mixing consoles or audio interfaces.
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Thru Output: Includes a parallel "Thru" 1/4 inch Jack output that allows the original instrument signal to be sent to an amplifier on stage for personal monitoring, without affecting the signal going to the mixing console.
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Signal Attenuator (Pad): A three-position attenuation switch (0dB, -20dB, -40dB) allows handling input signals with very high levels, such as those from keyboards or active pickups, preventing saturation and distortion at the mixer input.
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Ground Lift Switch: Incorporates a ground lift switch that helps to effectively eliminate hum and noise ("hum") caused by ground loops, a common problem in complex audio setups.
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Robust Construction: Its metal casing ensures great durability and protection against shocks, ideal for transport and intensive use on tours.
Benefits for the musician and the sound engineer
The OQAN QDI-300 MONO provides a direct and effective solution to the most common problems when connecting instruments to professional sound equipment. For the musician, it ensures that the instrument's tone reaches the mixer intact, without degradation. For the sound engineer, it is an indispensable tool that guarantees a clean, noise-free signal at the correct level, greatly facilitating the mixing process both live and in the studio.
Use cases
This injection box is ideal for a wide variety of applications:
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Guitarists and Bassists: To connect your instrument directly to the mixing board at a concert or in the studio, while sending the signal to your personal amplifier on stage.
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Keyboardists: It allows you to handle the high output levels of keyboards and synthesizers without distorting the mixer input, thanks to its attenuator.
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Electro-acoustic guitars: Adapts the pickup signal for optimal connection with the sound system, preserving the warmth and detail of the instrument.
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Recording Studios: Perfect for recording clean bass or guitar lines directly into an audio interface, allowing for subsequent signal processing (re-amping).
Frequently Asked Questions
What is a passive injection box?
A passive DI box uses a transformer to convert the signal impedance without requiring a power supply. They are ideal for instruments with strong (active) output signals, such as keyboards or basses with built-in preamps.
When should I use the "Ground Lift" switch?
You should activate the "Ground Lift" switch if you hear a persistent buzzing or "hum" after connecting all the equipment. This switch isolates the ground connection between the input and output, breaking the ground loop that often causes this type of noise.
What is the purpose of the attenuator (Pad Switch)?
The attenuator reduces the input signal level. Use the -20dB or -40dB position if your instrument's signal is too high and is causing clipping in your mixing console or audio interface. For most passive guitars or basses, the 0dB position will be adequate.
Project description
Passive mono direct injection (DI) box. It features one unbalanced 1/4-inch jack input and one XLR input. It includes one balanced XLR output and one unbalanced parallel (Thru) 1/4-inch jack output. It also features a ground lift switch and a three-position switchable signal attenuator: 0dB, -20dB, and -40dB. Heavy-duty metal chassis.
