Roksan Caspian 4G Streaming: the connected integrated amplifier

The British manufacturer Roksan has recently unveiled its integrated connected amplifier, the Caspian 4G Streaming. This model combines the latest advances in audio technology with refined design, delivering a high-quality listening experience.

With 2x105W into 8 ohms, a built-in DAC, and the BluOS streaming platform, the Caspian 4G Streaming marks a new chapter in the evolution of the Caspian range. Available since November 2024, it presents itself as a complete solution for audiophiles seeking both sonic performance and modern streaming features.

Two stacked gray metal audio devices with buttons and indicators, placed on a white windowsill near a wall niche

A new benchmark in the Caspian range

The Caspian 4G Streaming follows in the footsteps of Roksan’s high-end integrated amplifiers while introducing major innovations. It succeeds previous Caspian models, including the acclaimed M2, offering a comprehensive overhaul both technically and aesthetically.

This new device comes in two versions: the classic integrated amplifier Caspian 4G at €3500, and this Streaming version at €4500 integrating network features. Both models share the same technological foundation, with a few differences in connectivity.

Two black audio devices stacked with buttons and orange indicator lights, black remote control placed on a light surface

High-flying audio performance

A new generation of amplification

The Caspian 4G Streaming is built on Roksan’s Euphoria amplification technology. This dual mono architecture uses separate power supplies for current and voltage amplification circuits. The result is a power stage capable of delivering 2x105W into 8 ohms and 2x200W into 4 ohms, with very low distortion.

The amplifier operates in Class AB, combining harmonic richness with natural reproduction. A 600 VA toroidal transformer and capacitors totaling over 36,400 µF ensure excellent current reserves for dynamic, controlled performance, even with demanding speakers.

Angled view of an electronic circuit with a blue circular transformer, black capacitors, colored cables, and heat sinks

Cutting-edge digital-to-analog conversion

At the heart of the unit is the Rapture DAC, a digital-to-analog converter developed in-house by Roksan. It uses a differential current conveyor topology, processing the left and right channels separately. This approach aims to extract a maximum of information from the digital signal for the most faithful possible analog reproduction.

Preamplifier and phono stage

The Caspian 4G’s preamplifier section has been carefully optimized to reduce noise. It notably incorporates a ground switching system at the signal input, maintaining a very low crosstalk level between connected devices. The volume control uses a hybrid approach, combining digital and analog attenuation for optimal precision.

A full-featured network player with BluOS

The headline feature of this Streaming version is the integration of the BluOS platform, developed by Lenbrook and used notably by NAD and Bluesound. This system offers highly advanced multiroom audio streaming features:

Compatibility with major streaming services (Spotify Connect, Qobuz, Tidal, Deezer, etc.)
Playback of high-resolution audio files up to 24-bit / 192 kHz
Multiroom management for up to 64 zones
Access to internet radio and files shared on the local network

Network connection can be made via Wi-Fi or the Ethernet port. The Caspian 4G Streaming is also compatible with AirPlay 2 and includes Bluetooth aptX for wireless streaming from a smartphone or tablet.

Close-up of a hand holding a smartphone displaying an interface, black rectangular amplifiers on a light-colored piece of furniture

Refined design and craftsmanship

The Caspian 4G Streaming features an elegant design with a machined and extruded aluminum chassis. This robust construction aims to minimize vibrations and isolate sensitive circuits from electromagnetic interference. Assembly is carried out by hand in Roksan’s UK workshops.

The clean front panel includes a high-contrast OLED display and a tactile control wheel. An aluminum remote control is also included.

A dedicated app for an optimal user experience

The Caspian 4G Streaming incorporates a DSP (Digital Signal Processor) controllable via the MaestroUnite app. This allows fine-tuning of audio parameters based on room acoustics and user preferences. Features include:

Smart Tone: bass and treble adjustment
Smart Limit: dynamic range control
Smart Speaker: optimization based on the speakers used
Smart Phono: settings for the phono input

The app also provides full control of the device, from source selection to volume management.

Interior view with black low cabinet, black amplifiers, tilted abstract painting, pink vase, photo frames, beige armchair

A versatile audio investment

With broad source compatibility, generous power, and extensive streaming capabilities, it offers a complete solution for building a high-quality audio system. The ability to integrate into a multi-room setup via BluOS adds another layer to its appeal.

The Caspian 4G Streaming thus represents the evolution of Roksan’s iconic range, tailored to the demands of today’s audiophiles. It showcases the British manufacturer’s ability to combine its amplification expertise with the latest digital and streaming technologies.