Palmer RIVER spree PSPREE Active Stereo USB-C Media DI Box

Palmer RIVER spree PSPREE Active Stereo USB-C Media DI Box

The Palmer PSPREE RIVER spree Active Stereo USB-C Media DI Box converts digital audio from laptops, smartphones, and tablets into balanced analog signals for professional sound systems. Featuring 32-bit/192 kHz digital-to-analog conversion, transformer-isolated XLR outputs, and selectable microphone or line levels, it provides a dedicated connection between USB-C playback devices and professional audio equipment.

Designed for live sound engineers, touring professionals, musicians, and content creators, the Palmer RIVER spree simplifies the integration of digital playback sources into analog audio systems. Connect a compatible USB-C laptop, smartphone, or tablet directly to a mixing console, stagebox, or PA system without relying on conventional headphone outputs or separate audio adapters. The dual-channel design maintains stereo separation through independent left and right XLR connections, making it suitable for backing tracks, presentation audio, live event playback, and studio monitoring. Galvanic isolation separates electrical grounds between connected devices, helping reduce ground-loop hum and unwanted interference. The switchable Mic/Line output level provides additional flexibility when connecting to different mixing console inputs.

The Palmer PSPREE incorporates a dedicated 1/4" TRS headphone output for direct monitoring and a USB-C connection that supports both digital audio transfer and power delivery. The unit operates from USB bus power or its included external power adapter. When externally powered, USB-C power pass-through allows compatible connected devices to receive power during operation. SIGNAL, SYNC, and POWER indicators provide immediate feedback about connection and operating status. Constructed from powder-coated aluminum and steel, the enclosure is designed for portable audio systems, professional stages, and demanding production environments. Engineered in Germany, the RIVER spree combines digital audio conversion, balanced output connectivity, and flexible powering in a compact stereo DI box.

Key Features

• 32-Bit/192 kHz Digital-to-Analog Conversion: Converts high-resolution USB-C digital audio into stereo analog signals for professional playback, mixing, and monitoring applications.
• Dual Transformer-Isolated XLR Outputs: Provides two balanced XLR connections with galvanic isolation to help prevent ground-loop hum and minimize electrical interference between connected equipment.
• Selectable Mic/Line Output Levels: Switch between microphone-level and line-level operation to accommodate different mixing console inputs, stageboxes, and professional audio systems.
• USB-C Audio and Power Connectivity: Combines digital audio input and power functionality in one USB-C connection, supporting compatible computers, smartphones, and tablets.
• USB-C Power Pass-Through: Allows connected devices to receive power when the DI box operates using its included external power adapter.
• Dedicated Headphone Monitoring: Features a 1/4" TRS headphone output for direct audio monitoring or use as an additional analog signal output.
• Ground-Lift Switching: Provides additional control over grounding to help address unwanted noise in professional audio installations.
• Tour-Ready Metal Construction: Features an aluminum and steel enclosure with a powder-coated finish, three status indicators, and included power and connectivity accessories.

Professional USB-C Audio Conversion

High-Resolution Digital-to-Analog Processing

The RIVER spree incorporates a digital-to-analog conversion system supporting resolutions up to 32-bit/192 kHz. This allows compatible USB-C devices to deliver digital audio directly to the DI box for conversion into balanced analog output signals.

With a specified frequency response of 20 Hz to 20 kHz within +/-0.5 dB, the processor provides consistent response across the audible frequency range. A minimum signal-to-noise ratio of 112 dB supports clean signal transfer in professional playback applications.

Balanced Stereo Outputs with Galvanic Isolation

Two balanced 3-pin XLR outputs provide separate left and right audio channels for connection to professional mixing consoles, stageboxes, and compatible audio interfaces.

The outputs incorporate galvanic isolation through integrated transformers with a 1:1 transformation ratio. This design electrically separates connected audio equipment and helps reduce interference caused by differences in grounding potential.

A dedicated ground-lift switch provides additional grounding control when integrating the DI box into complex sound systems.

Switchable Microphone and Line Output Levels

The PSPREE features selectable Mic and Line output modes, allowing users to configure the analog output level according to the connected equipment.

Microphone-level operation supports integration with suitable microphone preamplifier inputs, while line-level operation accommodates compatible line inputs. The balanced outputs provide a maximum specified level of 18 dBu under the manufacturer's stated measurement conditions.

Flexible USB-C Power and Connectivity

USB Bus-Powered Operation

The Palmer RIVER spree supports USB bus-powered operation, allowing a compatible connected USB-C device to provide operating power without requiring the external adapter.

This configuration is useful for mobile production systems, temporary event installations, and other applications where minimizing external power connections is beneficial.

External Power and USB-C Pass-Through

The included external power adapter provides an alternative power source for the DI box. When the external adapter is connected, the USB-C interface supports power pass-through to compatible connected devices.

This feature allows a smartphone, tablet, or laptop to receive power while supplying digital audio to the DI box, subject to the connected device's power requirements and compatibility.

Integrated Headphone Monitoring

A dedicated 1/4" TRS headphone connection provides direct access to the converted audio signal for monitoring. The headphone output can also serve as an additional analog output in compatible applications.

Three integrated LED indicators display SIGNAL, SYNC, and POWER status, helping technicians confirm signal activity, USB synchronization, and operating power.

Applications for Live Sound, Studio, and Media Playback

The Palmer PSPREE is designed for professional audio environments requiring a dependable connection between USB-C media devices and conventional analog sound systems.

In live sound applications, playback engineers can route stereo backing tracks or event audio from a laptop directly into a mixing console using balanced XLR connections. Galvanic isolation helps address electrical interference between interconnected devices.

For presentations, conferences, and corporate events, the unit provides a direct audio interface between USB-C playback devices and installed sound systems. The selectable output levels allow integration with different input configurations.

Studio users and content creators can also use the RIVER spree as a compact stereo digital-to-analog interface with dedicated headphone monitoring. The metal enclosure and included accessories make it suitable for both fixed installations and mobile production equipment.

Technical Specifications

• Brand: Palmer
• Manufacturer: Adam Hall Group
• Model: RIVER spree
• Manufacturer Part Number: PSPREE
• Product Series: Palmer RIVER
• Product Type: Active Stereo USB-C Media DI Box
• DI Box Type: Active
• Number of Channels: 2
• Number of Audio Inputs: 1
• Number of Balanced Outputs: 2
• Digital-to-Analog Conversion: Up to 32-bit/192 kHz
• Frequency Response: 20 Hz to 20 kHz, +/-0.5 dB Relative to Average
• Signal-to-Noise Ratio: Minimum 112 dB
• Galvanic Isolation: Yes
• Isolation Transformer: Integrated
• Transformer Ratio: 1:1
• Ground-Lift Function: Yes
• Output Level Selection: Mic / Line
• Digital Audio Input: 1 x USB-C Female
• Input Signal Type: USB Digital Audio
• Balanced Audio Outputs: 2 x 3-Pin XLR Male
• Output Configuration: Stereo Left and Right
• Headphone Outputs: 1
• Headphone Connector: 1 x 1/4" TRS Female
• Maximum Balanced Output Level: 18 dBu at Less Than 1% THD, 20 Hz to 20 kHz
• Balanced Output Impedance: 600 Ohms at 1 kHz
• Maximum THD+N at 1 kHz: 0.015% at +4 dBu, Unity, Unweighted
• Maximum THD+N at 30 Hz: 0.015% at +4 dBu, Unity, Unweighted
• Maximum Intermodulation Distortion: 0.001%, SMPTE, 60 Hz, 4:1, +4 dBu
• Power Source: USB Bus Power or External Power Adapter
• External Power Operating Voltage: 18V DC
• USB Bus Power Requirement: 5V DC / 1A
• Rated Power: 5W
• USB-C Power Pass-Through: Supported with External Power Adapter
• Status Indicators: SIGNAL, SYNC, POWER
• Enclosure Materials: Aluminum and Steel
• Surface Finish: Powder Coated
• Color: Black
• Operating Temperature: 14 to 158 Degrees Fahrenheit
• Maximum Operating Humidity: 80%, Non-Condensing
• Dimensions (L x W x H): 5" x 5.5" x 2"
• Depth: 5"
• Width: 5.5"
• Height: 2"
• Weight: 1.3 lb
• Manufacturer Guarantee: 60 Months
• Manufacturer EAN-13: 4069724190103
• Engineering: Germany

What's in the Box

• Palmer RIVER spree PSPREE Active Stereo USB-C Media DI Box
• External Power Supply
• USB-C to USB-C Cable
• Rubber Feet
• Tour Label