iFi ZEN Air Blue
A sensible option to enable streaming and Bluetooth on any setup, with the best possible quality.
The rise of streaming platforms (both in video and music) has completely transformed the way we consume culture and entertainment. This paradigm shift has forced traditional high-fidelity systems to adapt to the convenience of wireless connectivity.
Faced with this challenge, there are two possible paths: a dedicated streamer or equipment that allows audio transmission via Bluetooth technology.
However, transmission via Bluetooth has historically carried the stigma of being a low quality route, prone to drastic compression and the loss of critical nuances. Let's be honest: the technology has existed for almost three decades now. Few of us are surprised. The reality, however, is that we are very far from its beginnings and that, unlike many past 'innovations,' it is a technology that has continued to advance.
And advance it has... so much so that today, several devices allow lossless audio transmission through this technology. Enter iFi Audio.
With the ZEN Air Blue, the British firm iFi Audio aims to eradicate these prejudices, offering a high resolution Bluetooth receiver that distills the technology of its higher tiers to serve the enthusiast seeking maximum convenience, without sacrificing rigorous digital to analog conversion.
As with the rest of the ZEN Air family, the brand's goal is to democratize access to high fidelity audio. To achieve this, they have eliminated costly metal chassis and balanced connections, concentrating all engineering resources on what truly matters: a state of the art digital front end and a selection of codecs and components capable of extracting every last bit of information from the air.
Build.
Physically, the ZEN Air Blue is presented in the now characteristic high resistance polymer casing with a light gray textured finish, a design that fits harmoniously into any modern audio rack without adding excessive weight.
On the front panel, simplicity is the rule: a single central button handles device pairing, flanked by two indicator lights that change color to visually report both the sample rate and the audio codec being received in real time.
The true magic of this device is hidden inside its internal board. Unlike the vast majority of Bluetooth receivers on the market, which use all in one integrated chips to receive and convert the signal by handling the entire process in a compromised manner, iFi has implemented an architecture split into professional level stages. Radio frequency signal processing is handled by an advanced Qualcomm QCC series chip, which strictly limits itself to receiving aerial digital information with maximum possible stability.
Once received, the signal is sent directly to an independent digital to analog conversion chip signed by ESS Sabre with HyperStream architecture. This dedicated converter integrates a time domain jitter eliminator, ensuring that the analog wave reconstruction is precise, clean, and free of the temporal distortions associated with basic wireless transmissions.
The rear section features a pair of RCA analog outputs and a high gain antenna that ensures excellent coverage even in rooms with multiple architectural obstacles.
To evaluate the real world performance of this wireless receiver, we integrated it into two different configurations. Listening sessions focused exclusively on playing high resolution streaming music files transmitted from mobile devices using LDAC and aptX HD high speed transmission codecs, which theoretically approximate CD quality.
Finally, I should mention that the user manual includes a setup configuration to use it as a Bluetooth receiver in a vehicle, connected to the car audio system. I found this configuration interesting, but it clearly falls outside the scope of this website and, therefore, of my review.
The Sound.
In the first configuration, we paired the ZEN Air Blue with the Vulkkano ARC 5 MKII active speakers, which, although they feature a Bluetooth receiver, do not support the lossless codecs provided by the Blue. The improvement? Clear and decisive. Beyond just the codecs, the advantage of signal processing via the ESS chip is evident and noticeable. The overall sound delivery gained clarity, definition, and depth. A clear winner for any pair of active speakers, whether they feature Bluetooth or not, that find their specifications upgraded by this device.
In a second phase, I decided to test it on the main system. While it already includes a dedicated streamer, exploring the flexibility offered by Bluetooth technology was necessary. To be honest, it is not my first choice for feeding music into the setup (currently comprising the Elektor preamp and the Hypex Ncore amplifier), but everything must be tested. The Blue was integrated as a source into the preamp and sent directly from there to the Axxess L1 speakers.
I have to say it. The acoustic behavior of the ZEN Air Blue stood out from the very first notes with a liveliness and clarity that, for a moment, seemed to disprove the argument against the source being wireless. I found no trace of the flat, compressed, or dynamic lacking sound usually associated with commercial Bluetooth receivers. The iFi delivers a balanced sound signature, with excellent extension at both ends of the spectrum and a transparency that allows evaluating the quality of the original production. Supported by stable streaming feeds, we selected three classic and contemporary works to test its performance:
Brad Mehldau – "After Bach: Rondo" (After Bach / Nonesuch Records / High Resolution Streaming): This complex solo piano piece is ideal for calibrating digital clock accuracy and the speed of the ESS Sabre converter. Transmitted via the LDAC codec, the ZEN Air Blue reproduces key attacks with formidable clarity. Mehldau's left hand descends with ideal weight in the low notes, while the intricate lines of the right hand unfold without smudging at all. The decay of notes in the room is perceived naturally, proving that the receiver respects microdynamics and instrument reverberation without applying aggressive compression that stifles the performance.
Gillian Welch and David Rawlings – "Woodland" (Acony Records / High Resolution Streaming): We move on to an acoustic folk rock production of exceptional timbral purity to analyze midrange management and string instrument textures. Welch and Rawlings' acoustic guitars appear on stage with excellent separation; you can clearly perceive the texture of the wood and the subtle picking of plectrums on metal strings. Both performers' voices project forward, warm and with a very real physical presence in the center of the listening room. The ZEN Air Blue avoids any digital harshness or artificial sibilance in upper mid frequencies, delivering vocal harmony with a fluidity that invites you to play album after album.
Jan Garbarek / The Hilliard Ensemble – "Parce Mihi Domine" (Officium / ECM Records / High Resolution Streaming): We close the session with a breathtaking work combining Garbarek's soprano saxophone with the chants of The Hilliard Ensemble in abbey acoustics. This track demands outstanding ability to reproduce the three dimensionality and atmosphere of the recording space. The iFi receiver manages the piece's massive reverberation with astonishing control; the choir voices float at the back of the soundstage, perfectly layered, while the saxophone soars with a clean, direct extension that cuts through the air without becoming harsh at peak intensities. The sense of air around the musicians confirms that the independent conversion stage performs flawlessly in preserving spatial micro details from the streaming feed.
Allowing for obvious differences, the noticeable gaps between playback through the dedicated streamer with a high end DAC and this Bluetooth receiver are apparent to a trained ear. However, the ZEN Air Blue undoubtedly provides an easy to integrate solution with more than acceptable results for anyone who, for one reason or another, cannot rely on a dedicated streaming setup and turns to this Bluetooth receiver as an alternative.
Technical Data.
Reception Chipset: Qualcomm QCC series optimized for high speed radio frequency audio management.
Digital to Analog Conversion: Dedicated ESS Sabre HyperStream DAC chip with built in jitter elimination.
Supported Bluetooth Codecs: Full support for LDAC, aptX HD, aptX Adaptive, aptX, AAC, and SBC, covering all market standards.
Frequency Response: Twenty hertz to twenty kilohertz with absolute linearity in the audio band.
Output Voltage: Two point zero volts at the RCA analog output, guaranteeing standard line compatibility with any preamplifier or integrated amplifier.
Power Supply: Five volt connection via rear USB C port, ideal for use with linear power supplies or standard power adapters.
Conclusions.
The iFi ZEN Air Blue proves with authority that the convenience of wireless streaming does not have to conflict with high fidelity audio demands. The British firm's success lies in treating the signal as a pure digital transport, delegating the delicate task of analog conversion to a specialized, mature circuit away from low cost integrated solutions.
While it lacks the aesthetic flourishes or balanced outputs of the upper range, its acoustic performance, thanks to the use of advanced codecs like LDAC, provides a rich, detailed listening experience of unquestionable musicality. For enthusiasts wishing to integrate streaming services into a classic analog setup quickly, affordably, and to a rigorous quality standard, the ZEN Air Blue stands as an indispensable tool.
A smartphone or tablet, a pair of cables, and you are ready to enjoy music with lossless quality. If making things easy is the goal, iFi takes the prize with the ZEN Air Blue.
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