A direct box is an essential device for transmitting signals from musical instruments or audio equipment to a mixer or audio interface. Radial Engineering is known as a manufacturer that provides high-quality and reliable products in this field.

Manufacturers like Countryman, Whirlwind, and BSS also produce DI boxes, but their products often have limited options tailored for specific applications. For this reason, we will focus on introducing direct boxes from Radial Engineering.

Types of Direct Boxes

A direct box (DI box) is an essential device for connecting instrument signals to a mixer or audio interface. DI boxes are broadly categorized into two types: active and passive, each with unique characteristics and advantages.

Features of Active DI Boxes

Active DI boxes require an external power source. They typically use phantom power (48V) or batteries to operate, allowing them to amplify low-output signals for transmission to mixers or amplifiers.

• Signal amplification: Active DI boxes amplify the signal, making them ideal for low-output instruments or those with passive pickups. They are commonly used with acoustic guitars, piezo pickups, bass guitars, and various other instruments.
• Wide frequency response: Active DI boxes have an amplified signal through their circuitry, resulting in a broader frequency response and clear sound quality from low to high frequencies.
• Phantom power compatibility: Many active DI boxes can use phantom power from mixers, eliminating the need for battery replacement.
• High-quality components and durability: Active DI boxes often use premium components, which makes them slightly more expensive but ensures stability and excellent sound quality.

Active DI boxes are primarily used when sound quality is a priority or when dealing with low-output signals. Additionally, high-end active DI boxes with various tone control features are preferred in studio and live stage environments.

Features of Passive DI Boxes

Passive DI boxes have a simple design that does not require external power and primarily use transformers to convert signals. This makes them highly reliable and suitable for stable use in various environments due to their straightforward structure.

• No power required: Passive DI boxes do not require power, eliminating the need for phantom power or batteries.
• Suitable for high-output signals: Passive DI boxes work well with high-output instruments or equipment, making them ideal for connecting high-output guitars or bass amps.
• Natural tone reproduction: Signal conversion through transformers provides a natural tone close to the original. Products equipped with Jensen transformers ensure exceptionally high-quality sound.
• High durability and portability: The simple structure makes them resistant to external impacts, and their portability is advantageous for live environments.

Passive DI boxes are particularly stable when handling high-output signals and are designed to minimize noise and distortion, delivering sound that is close to the original. Since they do not require batteries or phantom power, they can be used conveniently at any time.

Which DI Box Should You Choose?

Active DI boxes are suitable for low-output instruments (acoustic guitars, piezo pickups, passive pickups) because they can amplify signals and preserve sound quality effectively.

Passive DI boxes are more efficient for high-output instruments (electric guitars, bass amps, keyboards). Their simple design and durability make them reliable for live stage use.

RADIAL PRO DI

Passive Mono GND PAD

A basic passive DI box optimized for high-output instruments and line sources. It is useful for connecting electronic instruments such as guitars, basses, and keyboards, and features a ground lift function for effective noise elimination.

RADIAL PRO D2

PASSIVE STEREO GND PAD

The stereo version of the Pro DI, ideal for stereo equipment such as keyboards. It provides more stable signal transmission with two independent channels.

RADIAL PRO AV1

PASSIVE MONO GND PAD RCA

An AV-focused DI box that supports various input sources, making it suitable for connections with computers, smartphones, and more.

RADIAL PRO AV2

PASSIVE STEREO GND PAD RCA

The stereo version of the Pro AV1, delivering stable stereo signals from multimedia devices.

RADIAL PRO D8

PASSIVE 8CH GND PAD PHASE IN-B INSERT

An 8-channel passive DI box suitable for live performances and studio use.