Campfire Audio Relay vs Esoteric P-02X
The Campfire Audio Relay and Esoteric P-02X both handle digital audio, but one is a portable USB DAC and headphone amplifier while the other is a dedicated CD/SACD transport. We compare their design, features, claimed performance, system requirements and ideal users.
The Campfire Audio Relay and Esoteric P-02X both handle digital audio, but they are not direct substitutes.
The Relay is a pocket-sized USB DAC and headphone amplifier intended to connect computers and mobile devices directly to headphones or in-ear monitors.
The P-02X is a highly engineered flagship CD/SACD transport designed to read optical discs and send a digital signal to a separate DAC. That fundamental difference matters more than any individual specification: the Relay is about portable, self-contained headphone listening, while the Esoteric is a specialist source component for a full-size disc-based system. This comparison therefore focuses on their respective design priorities, connection options, usability and claimed performance rather than treating them as interchangeable products. Neither supplied article provides confirmed pricing, and neither contains comparative listening observations, so value and sound-quality conclusions must remain appropriately qualified.
At a glance
Choose the Campfire Audio Relay if you want a compact USB DAC/headphone amplifier for Windows, macOS, iOS or Android, with both 3.5mm single-ended and 4.4mm balanced headphone outputs.
It also provides high and low gain, six digital filters, a 60-step volume control and onboard playback controls.
Choose the Esoteric P-02X if your system is built around CD and SACD playback and you want a heavily engineered transport with the VRDS-NEO VMK-3.5-20S mechanism, extensive vibration control, four toroidal transformers and ES-LINK, XLR and coaxial digital outputs. There is no universal winner because one is a portable headphone front end and the other is a dedicated optical-disc transport requiring connection to an external DAC.
Campfire Audio Relay
The Campfire Audio Relay combines a USB digital-to-analog converter and headphone amplifier in a lightweight, precision-milled aluminum enclosure sized for a jacket pocket or handbag.
Its AKM 4493 SEQ DAC chip was selected by Campfire for what the company describes as a combination of technical excellence and subtle analog warmth.
USB-C compatibility covers Windows, macOS, iOS and Android, while separate 3.5mm single-ended and 4.4mm balanced outputs accommodate a broad range of headphones and IEMs. High and low gain settings, six digital filter modes, a 60-step volume control and onboard playback buttons provide more adjustment than its compact form might suggest. Campfire also includes a short USB-C cable, microfiber cloth and padded Ripstop carrying case.
Strengths
- Compact, lightweight aluminum enclosure designed for portable use
- Works with Windows, macOS, iOS and Android devices over USB-C
- Includes both 3.5mm single-ended and 4.4mm balanced headphone outputs
- Offers selectable high and low gain settings
- Provides six digital filter modes and a 60-step volume control
- Supports high-resolution PCM and DSD playback, with the source article citing support up to 32-bit/768kHz
- Includes onboard playback buttons, a USB-C cable, cleaning cloth and padded carrying case
Considerations
- It is a USB DAC and headphone amplifier rather than a CD or SACD transport, so it does not address optical-disc playback
- The supplied article contains no confirmed price or delivery information; its approximate €250 figure is explicitly presented only as an estimate based on a dollar price
- The article reports Campfire's intended sound character but provides no independent listening assessment or measurements
Best for: Listeners who use a computer, phone or tablet as a digital source and want a genuinely portable DAC/headphone amplifier with balanced and single-ended headphone connections.
Esoteric P-02X
The Esoteric P-02X is a flagship CD/SACD transport built around the VRDS-NEO VMK-3.5-20S mechanism.
Its engineering focuses on disc-reading accuracy, mechanical stability, power-supply separation and vibration control.
The duralumin carrier platter is machined to micron-level precision, the drive bridge uses 20mm-thick steel, and the spindle block contains selected steel ball bearings. A three-phase brushless motor and VS-DD spindle servo manage disc rotation, while a revised reading-head feed and guide-slide control system is intended to keep the laser at the optimal angle. Four toroidal transformers supply the servo, drive driver, digital output stages and clock generator. Digital connectivity consists of two ES-LINK outputs, two XLR outputs and one coaxial output, positioning the P-02X as a source for an external DAC rather than a complete playback system.
Strengths
- Purpose-built VRDS-NEO mechanism for CD and SACD playback
- Extensive mechanical engineering, including a precision-machined duralumin platter, selected steel ball bearings and a substantial steel drive bridge
- Three-phase brushless motor with a discrete three-channel VS-DD spindle servo
- Automatic drive cover closes and locks into the front panel to help isolate the mechanism from sound pressure and vibration
- Four toroidal transformers separately power major functional sections
- Rigid aluminum-panel construction, a 5mm steel lower chassis and four proprietary point supports
- Offers two ES-LINK, two XLR and one coaxial digital output
- Reworked oscillator circuitry and ES-LINK4 communication are intended to improve digital accuracy and DAC communication
Considerations
- It is a dedicated transport, and the supplied article presents its connections as digital outputs to a DAC rather than providing headphone amplification or direct analog playback
- Its elaborate full-size chassis and disc mechanism serve a fixed hi-fi system rather than portable listening
- The supplied article does not state a price, preventing a firm value judgment
- The article describes claimed engineering and sound-quality improvements but supplies no measurements or comparative listening results
Best for: Committed CD and SACD listeners building a high-end, component-based system around a separate DAC and prioritizing disc-reading precision, mechanical isolation and dedicated power supplies.
Head-to-head comparison
Design and build
The Relay and P-02X embody opposite approaches to physical design.
Campfire uses a lightweight, precision-milled aluminum enclosure compact enough for a pocket or handbag.
The supplied cable and padded carrying case reinforce its role as a portable component. Esoteric instead concentrates on mass, rigidity and mechanical isolation. Its P-02X uses robust aluminum exterior panels, a 5mm steel lower chassis, proprietary point supports and a dual-layer internal structure. The transport mechanism includes a micron-precision duralumin carrier platter, a 20mm-thick steel drive bridge and a steel base; the article states that the bridge weighs 5.2kg and reaches 12kg with the base. The automatic cover locks into the front panel to isolate the drive from vibration and external sound pressure. These are not competing interpretations of the same product brief: one minimizes size and weight, while the other uses substantial mechanical construction to stabilize optical-disc playback.
Edge: Esoteric P-02X for mechanical sophistication and vibration control; Campfire Audio Relay for portability.
Features and usability
The Relay is the more immediately self-contained option for headphone listening.
It connects through USB-C to Windows, macOS, iOS and Android sources and provides both 3.5mm single-ended and 4.4mm balanced headphone jacks.
High and low gain, six filter modes, 60-step volume adjustment and onboard playback buttons allow the user to tailor operation without adding a separate headphone amplifier. The P-02X has a narrower but more specialized role. It plays CD and SACD and sends digital audio through two ES-LINK, two XLR or one coaxial output. ES-LINK4 is intended to improve communication with a compatible DAC. It must form part of a larger component system, whereas the Relay can sit directly between a USB source and headphones or IEMs.
Edge: Campfire Audio Relay for broad device compatibility and direct headphone use; Esoteric P-02X for dedicated CD/SACD operation and multiple digital output options.
Sound and performance
The source material does not provide directly comparable listening tests or measurements, so neither product can be declared sonically superior.
Campfire says it selected the AKM 4493 SEQ DAC for technical ability combined with subtle analog warmth, with the intention of avoiding sterile reproduction.
That is a manufacturer-stated design objective rather than an independently verified listening conclusion. Esoteric's claimed performance rests on disc-reading accuracy, clock precision, stable power and suppression of mechanical interference. The P-02X uses the VRDS-NEO mechanism, a revised driver circuit, a three-phase brushless motor, a discrete VS-DD servo and a dedicated toroidal supply for the servo section. Its upgraded oscillator is also said to improve accuracy and sound quality. The Relay actually performs digital-to-analog conversion and drives headphones; the P-02X only supplies a digital signal to a separate DAC. As a result, the final sound of an Esoteric-based system necessarily depends on equipment beyond the transport described in the article.
Edge: No defensible overall winner: the products perform different stages of the playback chain, and the supplied articles do not contain comparative listening evidence.
Value
A reliable price-to-performance comparison is impossible from the supplied material.
The Relay article offers no confirmed price or availability information, giving only a tentative estimate of around €250 based on a dollar price.
The P-02X article provides no price at all. Feature value is therefore the safer basis for comparison. The Relay consolidates USB conversion, volume control, headphone amplification, balanced and single-ended outputs, gain selection and digital filters in one portable enclosure. The P-02X devotes its resources to a specialist disc mechanism, multiple isolated power sections, substantial chassis construction and several digital output formats. The Relay is the more consolidated solution, but the evidence does not support a claim about which product offers better monetary value.
Edge: Campfire Audio Relay for functional consolidation; no winner on price-based value because confirmed pricing is absent.
Ideal user
The Relay suits listeners whose libraries reside on phones, tablets or computers and who listen through headphones or IEMs.
Its platform compatibility, gain settings and dual headphone connections make it adaptable to portable and desktop use.
The P-02X is for a fundamentally different listener: someone with a significant CD or SACD collection, a separate DAC and a fixed component system. Its engineering is most relevant to buyers who place a premium on optical-disc reading, mechanical stability, clocking and isolated power supplies rather than pocketability or direct headphone operation.
Edge: Campfire Audio Relay for portable and computer-based headphone listeners; Esoteric P-02X for dedicated high-end CD/SACD systems.
System requirements and upgrade paths
The Relay requires a compatible USB source and headphones or IEMs, after which it can function as the conversion, volume-control and amplification stage.
Its 3.5mm and 4.4mm outputs provide flexibility when changing headphones, while filter and gain settings offer some room for matching preferences and equipment.
The P-02X is explicitly a transport with digital outputs and therefore belongs upstream of a separate DAC. Its ES-LINK, XLR and coaxial connections provide several ways to integrate it into a component system, although the supplied article does not detail compatibility requirements for every connection. The P-02X offers the more modular system architecture, while the Relay reduces the number of components needed for headphone playback.
Edge: Depends: the Relay minimizes system complexity, while the P-02X better fits a modular disc-based system.
Final verdict
Winner: Depends
There is no meaningful universal winner between the Campfire Audio Relay and Esoteric P-02X because they solve different problems at different points in the digital audio chain.
The Relay is the clear choice for portable or desktop headphone users who need USB conversion and amplification in one compact device.
Its cross-platform USB-C support, balanced and single-ended headphone jacks, adjustable gain, filters, volume control and included carrying accessories make it the more versatile standalone listening tool. The P-02X is the appropriate choice for a dedicated CD/SACD system. Its VRDS-NEO mechanism, three-phase brushless motor, discrete spindle servo, multiple toroidal transformers, rigid chassis and extensive vibration-control measures demonstrate a much more specialized focus on extracting and delivering digital data from optical discs. It also offers several digital output formats for connection to an external DAC. The evidence does not support a direct sound-quality or value winner: there are no comparative listening findings or measurements, and confirmed prices are not supplied for either product. The decision should therefore be based on source format and system architecture. Choose the Relay for USB-based headphone playback; choose the P-02X for high-end CD and SACD transport duties.
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