Radial Engineering J33 RIAA Turntable Preamp Direct Box

The Radial Engineering J33 RIAA Turntable Preamp and Direct Box is a versatile and professional-grade solution designed for DJs, audio engineers, and vinyl enthusiasts looking to integrate turntables into professional audio systems. This unique device combines an RIAA phono preamp with a direct box (DI) in a single unit, ensuring accurate signal conversion and protection for high-fidelity vinyl playback.

RIAA Equalization: One of the J33's standout features is its built-in RIAA equalization curve, which corrects the naturally unbalanced frequency response of phono signals from vinyl records. This means that when a turntable is connected to the J33, the device automatically adjusts the signal to ensure accurate, flat frequency response, bringing out the true audio quality of your vinyl collection. The preamp is carefully designed to reduce distortion and provide pristine audio clarity, making it an excellent tool for recording, broadcasting, or live performance setups.

Direct Box Capabilities: In addition to functioning as a phono preamp, the J33 doubles as a direct box, allowing you to send a balanced signal directly to a PA system, recording interface, or console. The balanced XLR outputs are transformer-isolated, providing hum-free audio transmission and eliminating ground loop issues that can occur when connecting sensitive audio equipment in different environments.

Multiple Output Options: The Radial J33 offers a wide range of output options, making it highly versatile. You can connect it to stereo systems, mixers, or recording interfaces via its stereo RCA outputs, or send a balanced mono signal to PA systems via the XLR outputs. Additionally, the 1/4" TRS outputs can be used for direct connection to other gear, and a 3.5mm mini-jack output is provided for connecting to consumer-grade audio devices, such as portable speakers or headphones.

Turntable Protection: The J33 is designed to protect your equipment and maintain signal integrity. It features an input protection switch that safeguards the turntable from electrical surges or spikes, which can occur when connecting to different systems. The switch provides a soft start for the unit, preventing unwanted pops or clicks when powered on, and the unit’s internal circuitry ensures optimal performance and long-term reliability.

The J33 is housed in Radial’s signature 14-gauge steel enclosure, which provides durability for both studio and live applications. The bookend design not only protects the connectors and switches but also allows easy stacking and convenient cable management. With its robust construction and intuitive design, the J33 is perfect for both professional and casual vinyl users who demand high-quality audio in any setting.

Features

• RIAA Phono Preamp: Built-in RIAA equalization for proper vinyl playback.
• Direct Box Functionality: Transformer-isolated XLR outputs for balanced signals.
• Multiple Outputs: RCA, 1/4" TRS, and 3.5mm mini-jack outputs for versatility.
• Turntable Protection: Input protection switch prevents electrical surges and damage.
• Durable Construction: Radial’s 14-gauge steel enclosure for rugged use.
• High Signal Integrity: Eliminates hum and noise in professional setups.
  

Specifications

• Frequency Response: 20 Hz to 20 kHz (RIAA Equalization)
• Input Impedance: 47k Ohms
• Outputs: Stereo RCA, XLR (balanced), 1/4” TRS, 3.5mm mini-jack
• Power Supply: External 15VDC supply
• Dimensions: 84 x 127 x 48 mm (3.3 x 5.0 x 1.9 inches)
• Weight: 0.75 kg (1.65 lbs)