Caspian Series 4G sets a new benchmark for high-fidelity electronics. Every detail has been crafted to deliver on its promise of pure performance. The range now comprises a Streaming Amplifier, Integrated Amplifier, Streaming Pre-Amplifier, and Power Amplifier. Working seamlessly together, these components give listeners the flexibility to build a system tailored to their needs, from a single elegant solution to a fully separated configuration for ultimate control and power.

MaestroUnite

The forward-thinking MaestroUnite app provides access to a range of user-friendly options that enable a completely tailored experience. These include an initial out-of-box setup wizard, system control and other useful functions, and bespoke configuration with advanced options.

BluOS

BluOS remains Roksan’s streaming partner of choice due to its robust and user-friendly design. It supports high-resolution streaming up to 24-bit, 192 kHz and provides access to the most popular music streaming platforms, including Qobuz, Tidal, Spotify, Deezer, TuneIn, and many more.

RoonReady

The Caspian Streaming Pre-Amplifier is Roon Ready, making it ideal for music system and server integration as well as whole-house audio deployment.

Innovative Architecture Built-in

The Caspian Streaming Pre-Amplifier utilises the BluOS platform, providing users with access to virtually limitless music through premium wireless music streaming services.

Caspian Series 4G employs an ultra-high-resolution hybrid digital-analogue volume control algorithm. This approach combines the strengths of both digital and analogue domains, ensuring a low noise floor and smooth, precise volume transitions.

All Caspian Series 4G products are hand-built by technicians at Monitor Audio Group headquarters in Rayleigh, Essex. Within the sleek and elegant chassis, all components are expertly housed to ensure optimal signal transfer and pristine sound reproduction.

The powerful DSP engine at the heart of Caspian Series 4G enables advanced system optimisation and fine control over playback performance.

Roksan’s proprietary Rapture DAC architecture allows Caspian Series 4G models to extract significantly more musical information. The design is implemented in parallel through a dual-mono topology, delivering exceptional accuracy and detail.

Roksan’s Euphoria amplification excels in both power and finesse. In the Caspian Series 4G Power Amplifier, the Class AB topology has been evolved with individual power supplies for the voltage and current amplification stages. This reduced interaction results in purer, cleaner, and more detailed sound.

The Caspian Series 4G Streaming Pre-Amplifier features fully custom-built internal antennas for Bluetooth and Wi-Fi. These antennas include tuned reflectors that protect sensitive circuits from interference, ensuring a strong wireless connection while maintaining a clean external aesthetic.

Through the MaestroUnite app, Caspian Series 4G’s intelligent DSP engine optimises the listening experience using four key technologies: Intelligent Tone, Intelligent Boundary, Intelligent Speaker, and Intelligent Phono.

Caspian Series 4G features a new mono-colour, high-contrast OLED display that presents a clearer and larger single-point user interface than previous generations. Customisable input icons allow easy source selection, while a progress indicator displays information such as track length.

BluOS-enabled Premium Streaming

Streaming allows music to be enjoyed throughout the home at resolutions up to 24-bit, 192 kHz.

The Caspian Streaming Amplifier supports premium multi-room audio streaming, enabling users to access limitless music from popular streaming services and stream wirelessly with no lag or loss of sound quality. Up to 64 zones of high-resolution audio can be streamed simultaneously. BluOS also allows effortless browsing of locally stored music collections. The result is a fully immersive, whole-home high-fidelity listening experience.

Rapture DAC technology

Caspian Series 4G delivers accurate reproduction of the original recording through Rapture DAC technology, which is based on a differential current conveyor topology. This approach allows more musical information to be extracted, resulting in superior analogue reproduction. Compared to traditional op-amp-based DAC designs, the current conveyor topology offers improved gain-bandwidth characteristics essential for high-resolution audio. Despite being a fully discrete design, it relies on a single circuit element for gain matching, enabling highly effective implementation. Rapture represents a completely new approach to digital-to-analogue conversion.

Key Rapture DAC features include a dual-mono topology in which each channel is derived from the summation of two switched current sources to improve linearity.

LVDS transfer of sensitive timing and digital audio information. This ensures perfect digital signal integrity with no associated noise footprint, delivering precise stereo imaging, exceptional resolution, and an inky-black background between musical passages.

Cleanest Signal Path

The fully balanced design delivers exceptional noise rejection and features a novel ground-switching input architecture that keeps crosstalk between connected devices extremely low. This design is inherited and further refined from Roksan’s Attessa range. Multiple dedicated power supplies ensure clean current delivery with minimal noise, enabling even greater audio performance. A wide range of balanced and unbalanced inputs provides complete system flexibility, while seamless signal paths between system elements ensure optimal integration.

The Phono Stage

The Caspian Series 4G facilitates highly accurate vinyl playback. Dedicated inputs are provided for both MM and MC cartridges. RIAA equalisation is individually calibrated to cancel component tolerances, ensuring the purest possible vinyl reproduction. Intelligent phono DSP capability further enhances playback quality for record collections.

The integration of Roksan’s powerful DSP engine allows users to refine their listening experience by tailoring playback to their environment and preferences. This ensures faithful reproduction of the original recording as intended by the artist. The DSP engine is accessed via the MaestroUnite app and includes Intelligent Tone, Intelligent Boundary, Intelligent Speaker, and Intelligent Phono technologies.

The Perfect Balance Between Digital and Analogue

Users interact with the Streaming Amplifier and Integrated Amplifier via a centrally positioned, one-touch control dial. The dial is exquisitely crafted, impeccably damped, and provides haptic feedback for a refined user experience. It is flanked by high-resolution LED displays that indicate source and volume selection. Behind the dial, advanced digital signal processing enables tone control and system matching while preserving analogue signal purity.

The hybrid volume control is implemented using discrete sections to avoid distortions common in monolithic volume control chips. Each channel is kept separate to reduce crosstalk and enhance imaging. This design follows Monitor Audio Group’s Transparent Design Philosophy, imparting no character of its own onto the sound.

Chassis Design

The internal layout of Caspian Series 4G products reflects meticulous engineering. Despite the high density of components, every element is optimally positioned to minimise crosstalk, electrical interference, and noise, ensuring accurate sound reproduction. Each unit is hand-built by Roksan’s in-house technicians in Rayleigh, Essex, delivering total performance and an unparalleled listening experience.

Internal Antennas

While wired Ethernet can offer sonic advantages, wireless connectivity is often more practical. Traditional external antennas can compromise aesthetics and introduce interference. Roksan’s custom-designed internal antennas use tuned reflectors to protect sensitive circuits and enhance Wi-Fi performance without visual compromise.

Intuitive Setup and Control

Caspian Series 4G uses Monitor Audio Group’s in-house MaestroUnite app to simplify setup and control. The app enables quick device configuration, Wi-Fi connection, and Internet of Things functionality. Users can adjust input configuration, phono sensitivity, analogue input gain, balance, and low-power standby settings. The app also provides access to advanced DSP features that tailor sound to the listening environment. MaestroUnite supports setup and control of Roksan electronics and Monitor Audio Anthra subwoofers, offering a streamlined and intuitive user experience.

Additional MaestroUnite features include real-time room and speaker sound adjustment, wireless connection to compatible CD transports, 12V trigger integration, control of more than 30 audio parameters, energy optimisation through low-power standby modes, and automatic firmware updates delivered via Wi-Fi.

Caspian Power

The Caspian Power Amplifier is engineered to deliver uncompromising drive and power, whether used in stereo or mono-block configuration. It harnesses Roksan’s advanced Euphoria amplification architecture and precision-engineered analogue circuitry to ensure a transparent signal path that preserves every detail and dynamic nuance of the music.

When paired with the Caspian Streaming Pre-Amplifier, it forms a performance-focused duo. With fully balanced signal paths, together they unlock extraordinary clarity, authority, and scale across all genres. Simply add speakers.

Setup and system integration are seamless via the MaestroUnite app, giving users both simplicity and flexibility when creating their ideal listening experience.

Features

105 watts into 8 ohms and 200 watts into 4 ohms of clean, precise power per channel.
420 watts into 8 ohms and 630 watts into 4 ohms when mono-bridged for higher power.
Euphoria dual-mono Class AB amplifier architecture delivering total power and control.
RCA stereo and balanced XLR analogue inputs.
Machined and extruded 6 mm thick aluminium casework with integrated heatsinks.
Available finishes are silver and black.

Power and Finesse

Caspian Series 4G uses a new authoritative and intelligent Class AB amplifier architecture known as Euphoria. There is much more to sound quality than harmonic distortion and noise floor, although these remain important factors. Roksan prioritises intermodulation distortion and ensures that both harmonic and intermodulation distortion remain flat across frequency and load. The result is a sound that is purer, cleaner, and more detailed.

A power amplifier consists of two main sections that interact with each other but have very different characteristics. One section increases the voltage of the signal to the level required to drive the speaker, while the other increases the current needed to drive the speaker’s low impedance.

Both sections have been carefully analysed and improved by Roksan’s engineers. Within Caspian Series 4G, two separate bespoke power supplies are used, each independent of the other. Headroom on the voltage stage has been increased so that, regardless of how hard the amplifier is driven, this section does not voltage-clip.

Soft-clip Behaviour

This intelligent amplifier power supply architecture delivers exceptional clipping behaviour. It has been tuned through extensive listening sessions to extract the maximum sound pressure level from speakers before any perceptual degradation of audio occurs.

As a result, Caspian Series 4G sounds louder with more usable power, remaining clean, clear, and dynamically exciting. This provides exemplary levels of uncompromised power and scale, delivering total performance.

The Foundations

The number of components, capacitors, circuit boards, transformers, and amplifiers within a Caspian Series 4G product leaves little spare space inside its sleek and elegant enclosure. Every element is optimally positioned to minimise signal transfer issues, crosstalk, electrical interference, and noise, ensuring accurate reproduction of recorded sound.

Each unit is hand-built by Roksan’s expert in-house technicians in Rayleigh, Essex. Meticulously designed and engineered, Caspian Series 4G delivers total performance and an unparalleled listening experience.

Uncompromised System Performance

Caspian offers extensive system configuration options. Using a Pre-Amplifier and Power Amplifier together provides clearer signal management, lower noise, and greater upgrade flexibility compared to an integrated amplifier. Separating the stages reduces noise and interference by isolating delicate signal processing from high-current power amplification.

Each unit is optimised for its specific function, with the Pre-Amplifier handling source selection and volume control while the Power Amplifier focuses solely on driving the speakers. This approach also allows independent upgrades and enables larger, dedicated power supplies for each function, minimising electrical interference and improving overall performance.

Pinnacle System Performance

The pinnacle of system configuration and uncompromising sound quality is achieved by using multiple Power Amplifiers in mono-block format. Running Power Amplifiers in mono-block mode delivers commanding power, separation, and control that significantly surpasses an integrated amplifier. Each Power Amplifier handles a single channel with fully independent circuitry and power supply, virtually eliminating crosstalk. Mono-block operation supports increased power delivery, improved handling of demanding speaker loads, enhanced stereo imaging, and greater placement flexibility by allowing amplifiers to be positioned closer to the speakers. Electrical and mechanical interference are further minimised through isolated operation, benefiting grounding and heat dissipation.

Control and Power in Harmony

The Caspian Pre-Amplifier and Power Amplifier system extends the acclaimed Caspian Series, delivering greater clarity and dynamic power to unlock the full potential of music playback. Powered by Roksan’s advanced Euphoria Class AB amplification, the Power Amplifier offers commanding performance in both stereo and mono-block modes, combining muscular output with refined control and carefully minimised distortion.

The Pre-Amplifier is the perfect partner, offering precise control and effortless usability. Featuring Roksan’s proprietary Rapture DAC with a dual-mono topology, it ensures exceptional signal integrity and timing. Together, the system forms a perfectly matched combination that allows every musical detail to shine through.

Caspian 4G Pre-Amplifier Specifications

Analogue Inputs:	2x RCA Stereo (A1, A2), 1x Balanced XLR (A3)
Phono Inputs:	Moving Magnet, Moving Coil
Digital Inputs:	2x Coax (D1,D2), 2x Optical (D3,D4), Bluetooth Audio, BluOS, HDMI eARC
Analogue Outputs:	1x Balanced XLR (Pre1), 1x RCA Stereo (Pre2), 1x RCA Stereo (Pre3)
Amplifier Output:	N/A
Power:	IEC C14, Fused 6.2AT
Output Power, 8 0hms: (235VAC @ 1% THD, both channels driven)	N/A
Output Power, 4 0hms: (235VAC @ 1% THD, both channels driven)	N/A
Output Power, 8 Ohms: (235VAC @ 1% THD) -Mono-Bridged	N/A
Output Power, 8 Ohms: (235VAC @ 1% THD) -Mono-Bridged	N/A
THD+N: (1W @ 1kHz Both Channels driven)	<0.007%
MaestroUnite Supported:	Yes
Wired IR Input:	5 -14V, Mono 3.5mm jack plug, any polarity
12V Trigger Input:	5 -14V, 3.5mm jack dual polarity (On / Standby)
Power Consumption:	85VA Standby 0.5W Network Standby 2W (Standby Plus, allows wakeup from BluOS and fast boot)
External Dimensions with all accessories fitted: (H x W x D)	93 x 432 x 378mm (3 11/16 x 17 x 14 7/8”)
Weight:	10.1 kg (22 lb 4 oz)
Available Finishes:	Silver, Black

Caspian 4G Power Amplifier Specifications

Analogue Inputs:	2x RCA Stereo (A2, A3) 1x Balanced XLR (A1)
Phono Inputs:	N/A
Digital Inputs:	N/A
Analogue Outputs:	2x RCA Stereo (Line 1,2
Amplifier Output:	1x Pair of Speaker binding posts (L&R)
Power:	IEC C14, Fused 6.3AT -250V
Output Power, 8 0hms: (235VAC @ 1% THD, both channels driven)	105W
Output Power, 4 0hms: (235VAC @ 1% THD, both channels driven)	200W
Output Power, 8 Ohms: (235VAC @ 1% THD) -Mono-Bridged	420W
Output Power, 8 Ohms: (235VAC @ 1% THD) -Mono-Bridged	630W
THD+N: (1W @ 1kHz Both Channels driven)	<0.007%
MaestroUnite Supported:	Yes
Wired IR Input:	5 -14V, Mono 3.5mm jack plug, any polarity
12V Trigger Input:	5 -14V, 3.5mm jack dual polarity (On / Standby
Power Consumption:	610VA Standby 0.5W
External Dimensions with all accessories fitted: (H x W x D)	93 x 432 x 378mm (3 11/16 x 17 x 14 7/8”)
Weight:	14.9 kg (32 lb 14 oz)
Available Finishes:	Silver, Black

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