Line-Level Audio Divider/Combiner

The RDL AV-DC4 is a line-level audio divider/combiner designed for routing situations where audio signals must be combined, divided, or isolated. It can combine audio signals to a single output, combine stereo line-level signals, feed a mono signal to stereo inputs, or combine multiple lines to a single input. A rugged field case houses these functions, while switch-selectable ground isolation supports balanced-line applications that require ground-loop elimination.

Ideal Use Cases

The AV-DC4 is suited to line-level systems that require flexible signal distribution or consolidation. Its available configurations address several common routing requirements without limiting the unit to a single divider or combiner role.

• Combining multiple audio lines for connection to one input
• Combining stereo line-level signals
• Distributing a mono signal to stereo inputs
• Dividing a signal between multiple destinations
• Providing balanced mono galvanic isolation
• Eliminating line-level ground loops in balanced lines

Why Choose This Model

The AV-DC4 combines routing flexibility and isolation capabilities in one field-ready unit. Switch-selectable ground isolation allows isolation to be applied in balanced-line installations as required. Balanced mono galvanic isolation provides another defined option for managing signal paths affected by different ground references. Nominal input and output levels are both +4 dBu, making the operating level clear when planning integration with other line-level equipment.

Its divider and combiner functions also cover different signal-flow needs. The same model can support a single signal feeding more than one input or multiple signals feeding one input, including stereo and mono applications described for the unit.

Installation and Integration

The enclosure measures 3.53 inches wide by 7.93 inches long. Its height is 1.75 inches unmounted and 1.95 inches mounted. Metric measurements are 8.97 cm wide, 20.14 cm long, 4.45 cm high unmounted, and 4.95 cm high mounted. These dimensions can be used to plan placement and clearance before installation.

During integration, account for the +4 dBu nominal input and output ratings and select ground isolation according to the balanced-line application. The specified ambient operating range is 0°C to 55°C. The rugged field case is finished in RDL Dark ULTRASTYLE, described as dark gray with beige lettering.

Performance Highlights

Frequency response is specified from 20 Hz to 20 kHz within ±0.05 dB. THD+N is less than 0.5% from 50 Hz to 20 kHz when measured with two 150 Ω sources and two 10 kΩ loads; the specified figure at 1 kHz is 0.02%.

Insertion loss depends on the routing configuration. With one input and one output, nominal insertion loss is 1 dB. With two inputs and two outputs, nominal insertion loss is 6 dB. These published values provide concrete level information for system design and gain planning rather than treating every routing arrangement as electrically identical.

What Makes It Different

The distinguishing feature of the AV-DC4 is the combination of signal division, signal combining, and isolation functions in a rugged field enclosure. It addresses stereo line-level combining, mono-to-stereo distribution, multiple-line combining, balanced-line ground isolation, and balanced mono galvanic isolation. That range makes it applicable to installations where the required signal direction or isolation condition may vary from one system design to another.

The unit also provides clearly defined audio-band performance, nominal operating levels, configuration-dependent insertion loss, and physical dimensions. Together, those specifications make it possible to evaluate both its electrical role and its installation footprint before placing it into a signal path.

Final Assessment

The RDL AV-DC4 is a focused solution for combining, dividing, and isolating +4 dBu line-level audio. It is particularly relevant when a mono signal must feed stereo inputs, multiple lines must reach one input, stereo line-level signals must be combined, or balanced-line ground loops must be addressed. Its 20 Hz to 20 kHz frequency response, specified distortion figures, selectable isolation, and rugged case define its role clearly for planned audio routing applications.