dbx DI4 - 4-Channel Active Direct Box with Line Mixer and 20dB Pad Switch in Black Finish

The dbx DI4 is a highly versatile 4-channel active direct box designed to meet the demands of both live sound and studio environments. This compact unit offers a robust solution for converting unbalanced signals into balanced outputs, making it ideal for use with mixers, PA systems, recording consoles, and more. Additionally, the DI4 functions as a multi-channel stereo line mixer, providing flexibility for connecting multiple audio sources and managing both stage and front-of-house mixes.

The DI4's design incorporates four independent direct box channels within a space-efficient 1/2 RU package. Each channel is equipped with a dedicated 20dB pad switch, allowing for attenuation of high-level signals to prevent distortion and ensure optimal signal handling. Additionally, each channel features its own ground (earth) lift switch to address any potential hum and buzz issues caused by ground loops, ensuring a clean and interference-free signal path.

For users who need to manage multiple audio sources, the DI4 includes independent volume and pan controls for the line mixer output, enabling precise adjustments to the mix. This feature is particularly useful for combining signals from various keyboards, samplers, and modules, allowing for a customized stage mix that can be independently controlled. The master volume control further facilitates overall level adjustments for the line mixer output.

The DI4 also features a headphone output, providing a convenient way to monitor the mix directly from the unit. This is especially valuable during live performances and studio sessions where immediate monitoring is required.

In terms of audio inputs, the DI4 provides four 1/4-inch TS unbalanced connectors with an input impedance of 320k Ohms. The peak input level is +15 dBu, accommodating a wide range of signal strengths. The stereo line mixer outputs are provided via RCA connectors, with an output impedance of 600 Ohms and a maximum output level of +16 dBu. The DI4's balanced XLR outputs ensure high-quality signal transmission, with a maximum output level of +15 dBu.

The performance specifications of the DI4 are impressive, with a frequency response of 20 Hz to 20 kHz, maintaining accuracy within ±2 dB. The total harmonic distortion plus noise (THD+N) is extremely low at 0.0008% typical at +4dBu and 1 kHz, ensuring pristine signal quality. Interchannel crosstalk is better than <-90dB from 20 Hz to 20 kHz, and the dynamic range is a remarkable 129.5 dB (A-Weighted), providing excellent signal fidelity and clarity.

Powering the DI4 is a 9VDC external power adapter, with a power consumption of 775 mW. The included power adapter model PS0913DC-04 is compatible with various international standards (US, JA, EU, AU, UK), making it suitable for use in different regions.

Constructed with a durable metal chassis, the dbx DI4 is built to withstand the rigors of both live and studio environments. Its dimensions of 8.5 x 8 x 1.75 inches and weight of 3.85 lbs make it compact yet sturdy, ensuring reliable performance in a variety of settings.

In summary, the dbx DI4 4-Channel Active Direct Box with Line Mixer is a powerful and versatile tool for managing multiple audio sources, providing balanced outputs, and delivering high-quality signal processing. Its comprehensive feature set, combined with its rugged design, makes it an invaluable asset for any audio professional.

Features

• 4-channel active direct box and multi-channel stereo line mixer in a 1/2 RU package
• Independent 20dB pad switch per channel for signal attenuation
• Ground (earth) lift switch per channel to eliminate hum and buzz
• Independent volume and pan controls for line mixer output
• Master volume control for overall line mixer output adjustment
• Headphone output for direct monitoring
• Inputs: 4 x 1/4-inch TS connectors with 320k Ohm impedance, peak input level +15 dBu
• Stereo line mixer outputs via RCA connectors, output impedance 600 Ohms, maximum output level +16 dBu
• Balanced XLR outputs with maximum output level +15 dBu
• Frequency response: 20 Hz to 20 kHz, ±2 dB
• Low THD+N: 0.0008% typical at +4dBu, 1 kHz
• Interchannel crosstalk: <-90dB, 20 Hz-20 kHz
• Dynamic range: 129.5 dB (A-Weighted)
• Powered by 9VDC external adapter, power consumption 775 mW
• Compatible power adapter model: PS0913DC-04 (US, JA, EU, AU, UK)
• Durable metal chassis with compact dimensions: 8.5 x 8 x 1.75 inches, weight: 3.85 lbs

Specifications

Audio Inputs

• Number of Connectors: 4
• Connection: 1/4-inch TS
• Type: Unbalanced
• Input Impedance: 320k Ohms
• Peak Input Level: +15 dBu

Stereo Line Mixer Outputs

• Connection: RCA
• Output Impedance: 600 Ohms
• Maximum Output Level: +16 dBu

Outputs

• Number of Connectors: 4
• Connection: Male XLR, Balanced, Pin 2 hot
• Maximum Output Level: +15 dBu

Performance

• Frequency Response: 20 Hz-20 kHz, 0 dB to -2 dB
• THD+N: 0.0008% typical at +4dBu, 1 kHz
• Interchannel Crosstalk: <-90dB, 20 Hz-20 kHz
• Dynamic Range: 129.5 dB (A-Weighted)

Power Supply

• Power Requirements: 9 VDC external power adapter
• Power Consumption: 775 mW
• Power Adapter Model: PS0913DC-04 (US, JA, EU, AU, UK)

Physical

• Dimensions: 8.5 x 8 x 1.75 inches
• Weight: 3.85 lbs