Weiss Engineering Helios
Deliciously Crispy
Sound Quality
96/100
Build Quality
93/100
Features Connectivity
90/100
Value for Money
85/100
The Helios delivers transparent, natural conversion with exceptional micro-detail, focused imaging and muscular dynamic contrast. Tom Waters admired its tonal balance and depth, while Grover Neville found its comprehensive DSP—room EQ, vinyl emulation and superb crossfeed—remarkably unobtrusive. Streaming, preamp and headphone duties make this a genuinely flexible digital control center.
Pros
Exceptionally transparent, balanced and natural sound with outstanding micro-detail and recorded depth.
Strong dynamic contrast, controlled bass and large, precisely focused images without exaggerated scale.
Extensive, effective DSP suite, including highly regarded crossfeed, useful room EQ and engaging vinyl emulation.
Cons
Its revealing, unembellished presentation leaves poor recordings nowhere to hide.
DSP settings require restraint, as aggressive adjustment can produce audible harshness on some recordings.
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What Reviewers Are Saying
SOUND QUALITY PERFORMANCE 96/100
Reviewers describe an exceptionally transparent, natural and finely balanced converter that combines incisive resolution with ease and musical coherence. Its presentation is said to remain composed and engaging through dense material, with strong dynamic contrast, focused imaging and an unusually convincing sense of recorded depth.
Tonal Balance and Musicality
96/100
SoundStage Solo calls the Helios beautifully balanced across the frequency range, with accurate tonality, vibrance and a natural, open presentation. Part Time Audiophile similarly hears top-to-bottom liquidity and coherence, with no bothersome texture or glare; music is highly revealing without being aggressively analytical.
Resolution and Detail
97/100
Detail retrieval is a defining strength. SoundStage Solo reports hearing tiny breaths, saxophone air, drum textures and exceptional depth, calling its layering and micro-detail retrieval the best the reviewer had heard. Part Time Audiophile also finds it spectacularly detailed, while retaining large, focused images rather than exaggerated hi-fi scale.
Digital Performance
95/100
The Helios is repeatedly described as exceptionally clean and free of typical digital artifacts, with a seamless quality and virtually no detectable texturing. Part Time Audiophile found its DSP processing effectively transparent even when multiple functions were active, preserving dynamics and low-level information, while SoundStage Solo noted quick, secure input lock.
Assessments of Build Quality, Usability, and Overall Propositions.
Build Quality
93/100
The Helios uses a substantial double-chassis construction: a stainless-steel internal frame within thick aluminum outer panels. SoundStage Solo found it notably solid and designed to reduce EMI/RFI intrusion, while Part Time Audiophile describes the fit and finish as impeccable, luxurious and understated.
Features Connectivity
90/100
Connectivity is extensive, including AES/EBU, coaxial and optical S/PDIF, USB, Ethernet streaming, balanced XLR and RCA outputs, plus PCM to 384 kHz and DSD128 support. It is a Roon Ready UPnP streamer with remote, display, preamp and headphone functions, and its unusually comprehensive DSP suite covers room/headphone EQ, de-essing, loudness, crossfeed, crosstalk cancellation and vinyl emulation.
Value for Money
85/100
At approximately US$21,995 or AU$36,000, the Helios is positioned firmly in the statement-DAC market. The reviews are highly enthusiastic about its performance and facilities, but they do not directly compare its value against competing products or make an explicit price-to-performance case.
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Specifications
- Digital Inputs
- There are a total of five inputs: AES/EBU or S/PDIF via XLR, Toslink and RCA sockets. UPnP/DLNA via Ethernet. USB. Roon Ready. Accepted formats: PCM 44.1kHz up to 384 kHz, DSD 64x / 128x. Future formats can be accommodated via software updates. Maximum input word-length: 24 Bits
- Analog Outputs
- Outputs Line / Headphone out unbalanced on RCA connector. Line / Headphone out balanced on XLR connector. Output stages based on our discrete OP2-BP Operational Amplifier design are employed. The output levels can be set in a coarse manner with eight steps to adapt for the amplifier or headphone connected. The levels can be set independently for line and headphone outputs. No sound degrading servo mechanisms are used.
- Digital Signal Processing
- The HELIOS uses a built-in digital signal processing (DSP) chip for its audio processing. These algorithms are included: Room Equalizer – to suppress room modes for more accurate bass reproduction. Creative Equalizer – a tone control with low boost/cut, high boost/cut, and mid boost/cut. Very useful to correct those recordings which do not quite sound right. De-Essing – the automatic removal of overly bright sibilances from human voices. The sibilance effect can be more or less pronounced depending on your speakers or room acoustics. Constant Volume – adjusts the audio volume (loudness) to a constant value across all tracks played. Useful for “party mode” when the volume control should stay untouched. Vinyl Emulation – get that special sonic character of a record player based playback chain. We also employ an emulation of the DMM-CD procedure offered by the Stockfisch label. Crosstalk Cancelling (XTC) – for the playback of dummy head recordings or live recordings via speakers for an incredible live sensation. Dummy head recordings usually are listened to via headphones because they only work properly if the left channel goes to the left ear only and the right channel to the right ear only. With speakers this is difficult to achive as the left channel goes to the left and the right ear. But with some clever signal processing of the speaker channels is is possible to suppress the crosstalk, i.e. the audio going from the left speaker to the right ear and vice versa. If that works properly then the recording sounds as if one would be in the space where the recording has taken place. All the reverberation and 3D representation of the sound sources is there.(For speaker based playback only.) Loudness Control – a listening volume dependent equalization of the audio. Headphone Equalizer – to adapt any headphone to the listener’s ears in terms of frequency response. Crossfeed – to emulate a speaker based playback impression on headphones.
- Front Panel Controls
- A rotary encoder knob for changing parameters and for powering the unit on/off. A touch screen colour LCD display. An IR receiver.
- Back Panel Elements
- Analog outputs on XLR and RCA connectors. Digital inputs on XLR, RCA, TOSLINK, USB, and Ethernet connectors. USB type-A connector for various applications. Mains connector with fuses.
- Dimensions
- HELIOSDepth: 30 cm / 11.8 inchesWidth: 45 cm / 17.7 inchesHeight: 6.6 cm / 2.6 inchesHeight with feet: 7.4 cm / 2.9 inches IR Remote ControlDepth: 2.1 cm / 0.83 inchesWidth: 4.5 cm / 1.78 inchesHeight: 16.6 cm / 6.53 inches
- Power Supply
- A powerful non-switching power supply is used. All sensitive voltages have their own regulators which are separated between left and right channels. The result is an analog output free of “digital noise” and channel crosstalk. The power switch activates a semiconductor relay which only switches on or off at zero crossings of the mains voltage. This assures a glitch-free power switching. The two mains transformers are toroidal types. Mains voltage selection is done automatically by measuring the mains voltage before power is applied to the rest of the electronics.
Manufacturer's Description — Weiss Engineering
Nothing between you and the music
PROFESSIONAL-LEVEL digital-to-analog converter
Originating in Weiss Engineering’s product line for professional mastering studios, the HELIOS is truly a zero-compromise DAC. For those seeking the same representation of their music as mastering engineers hear when fine-tuning the audio in the studio, the HELIOS is the unit to get.
Main Features
Weiss helios
professional level at home
Weiss Engineering’s professional clients work in the world’s top-tier studios, fine-tuning the sound of the biggest artists on the planet. It is not an option for them to use anything but the best monitoring chains in existence. This is why they use Weiss Engineering’s professional DACs.
The HELIOS maintains that same quality level, with design and features that better suit the high-end hi-fi market. With the HELIOS, you are hearing what the professionals are hearing.
HIGH CONNECTIVITY
The HELIOS comes with digital inputs in numerous formats and has both balanced and unbalanced analog outputs. All standard sampling frequencies up to 384 kHz plus DSD x64 and x128 are supported.
Furthermore, the unit functions as a preamp, headphone amp, and a streamer (UPnP/ROON).
HELIOS PRODUCT COMPARISON
The HELIOS and its siblings DAC501 and DAC502 are based on the same digital audio platform, but the HELIOS sports a different D/A Converter and analog output section.
The HELIOS’ XLR and RCA outputs can be used to drive amplifier line inputs as well as headphones directly or via a dedicated headphone amplifier.
The DSP processing can be switched to speaker or headphone mode as required.
The HELIOS housing is made of a dual frame scheme with a stainless steel internal frame and a thick aluminum outer frame.
PURIST SIGNAL PATH
To achieve its exceptional performance specifications, the HELIOS uses an eight-channel 32-bit D/A converter chip, with four paralleled conversion channels per audio channel. All analog processing is done with our own discrete operational amplifier modules, the Weiss OP2-BP — arguably the best audio operational amplifier currently available.
It also uses an internal high-precision/low jitter clock generator for ultra-stable clocking of the D/A converter section.
PROFESSIONAL PROCESSING
The built-in digital audio processing is based on the same trailblazing algorithms that are used in Weiss Engineering’s professional audio tools.
So with the HELIOS you can adjust the audio using the same professional-grade algorithms that were used to mix and master the original recordings.
EASE OF USE
The HELIOS comes with an IR remote control which can be used to select the active input and output, the DSP audio processing presets, and switch power on and off.
Furthermore, it is possible to control and configure the HELIOS via a web browser, which adds detailed control of the DSP processing and preset management.
Verified Dealers
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- In Living Stereo — in-store — New York City, New York, United States (website)
- The Music Room — online and in-store — Erie, Colorado, United States (website)
- 1877 Audio — in-store — Genay, Auvergne-Rhône-Alpes, France (website)
- à la carte productions — in-store — Palm Coast, Florida, United States (website)
- Addicted to Audio — online and in-store — Epping, Victoria, Australia (website)
- Akustik Strauss — in-store — Garmisch-Partenkirchen, Bayern, Germany (website)
- Alpha High End — online and in-store — Brasschaat, Vlaams Gewest, Belgium (website)
- Anquan — online and in-store — Glika Nera, Greece (website)
- Audio Art - USA — in-store — Richmond, Virginia, United States (website)
- Audio Natali — in-store — Montecatini Terme, Toscana, Italy (website)
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