Radial Engineering J+4 Active Stereo Line Driver with Transformer Isolated Inputs

The Radial Engineering J+4 is a stereo interface designed to accept consumer level -10 dB unbalanced high impedance signals and convert them to +4 dB balanced low impedance signals for easy manipulation in professional level environments such as broadcast, recording studios and live touring.

Noise is eliminated by combining the advantages of active signal buffering with transformer isolation. The J+4 delivers better than 95 dB signal to noise while ensuring hum and buzz caused by ground loops along with spurious noise from clocking does not pollute the signal path. Controls have been kept to a minimum. This includes a stereo level control, high pass (low cut filter) and ground lift. A selection of input connectors include a stacked set of ¼" jacks for DJ mixers or keyboards, RCA's for CD players and a mini 3.5mm for auxiliary connection.

A unique 14-gauge steel I-beam inner frame ensures the sensitive PC board will not be subjected to outside stress which could potentially cause solder joints to fail. An innovative book-end outer shell creates protective zones around the sensitive controls, switches and connectors to further improve dependability while a full bottom no-slip pad provides both mechanical and electrical isolation.

The Radial J+4 balanced line driver delivers exceptional sonic performance, plenty of headroom and ultra low noise making it the ideal companion in today's more demanding professional audio systems.

Features

• Stereo preamp boot signals to +4 dB balanced line level
• Increases gain for low-output instrument and music players
• Transformer isolated to eliminate ground loops
• Stereo 1/4", 3.5mm, and RCA input options

Specifications

• Audio Circuit Type: Active -10 dB to +4 dB line converter, transformer isolated
• # of Channels: 2
• Frequency Response: 20 Hz to 20 kHz (±2 dB)
• Dynamic Range: 102 dB
• Total Harmonic Distortion: 0.004% @ 1 kHz, +10 dBu output
• Phase Deviation: 0.5° @ 100 Hz; 4° @ 20 Hz
• Inputs: 1/4", RCA, and 3.5mm
  • Input Impedance: 10 kΩ, unbalanced
  • Max. Input Level: +17 dBu @ 1 kHz, 1% THD+N
• Outputs: XLR
  • Output Impedance: 1.6 kΩ, balanced
  • Max. Output Level: +15 dBu @ 1 kHz, 1% THD+N
• Features: Ground Lift, HPF, Level Control
• Construction: 14-gauge steel
• Power: +15VDC/400 mA adapter included
• Conditions: For use in dry locations only, 5-40°C
• Dimensions (H x W x D): 3" x 4" x 6.5"
• Weight: 1.55 lbs. (0.70 kg)