Note that this is a discontinued product. You may want to visit the brand's page here to browse their newer products.
What reviewers think
Bloggers and YouTubers have tried this product—so we've summarized their strongest opinions below. Links to full reviews follow.
Product Strengths
- Constructed with 15mm thick bituminized aluminum panels, internally damped, that avoids ringing and time-smearing, offering a rigid and non-resonant enclosure
- Delivers a detailed and powerful sound reproduction, comparable to larger floor-standing speakers
- Offers extreme perceived freedom from any cabinet resonance or coloration
- Soundstage is wide and deep with excellent imaging
- Designed for easy placement within a normal living environment, not hampered by proximity to room boundaries
Product Considerations
- At 84dB, the sensitivity is not especially efficient
- Bass only goes down to 45 Hz, and in a larger room, the bass may not be enough for some listening predilections
- Requires toe-in to get all of the considerable treble detail and delicacy they have to offer
- Might require a subwoofer
Comparisons (according to reviewers)
- Vs Klipsch RP-600M II: Acelec's sound was stark, dark, and no-glass clear, unlike the Klipsches' hazy neon-lit environment
- Vs YG Acoustics and Magico: Acelec speakers share a distinct and appealing form of clarity not found in speakers using more sundry cabinet materials
- Vs Genelec G Three: Acelec's aluminum panels came even closer to complete silence
- Vs TAD CE1TX: Acelec Model One equaled TAD's CE1TX monitors in its ability to deliver perfectly sorted—minutely organized—naturally displayed recorded data
- Vs Dali Oberon 5: Acelec Model One performs best when toed in a fair amount and spaced a bit wider
- Vs Devore Super Nines or 0/96, Dali Oberon 7, or Xavian Perla Esclusiva monitors: Acelec Model One doesn't quite have the scale and sweep
Takeaway: The Acelec Model One speakers are well-engineered to minimize cabinet resonance and coloration, providing a detailed, transparent, and accurate sound reproduction. Their compact size and easy placement make them a versatile option for various listening environments.
All
Acelec Model One Passive
reviews

Manufacturer details
- System Format: 2-way
- Housing: 15 mm bituminized aluminum
- Bass Alignment: Low Q alignment Vented port system
- Frequency Response: 45 Hz – 35 kHz Max. deviation ± 2.5 dB
- Sensitivity (1W@1M): 84 dB
- Nominal Impedance: 8 ohms
- Minimum Impedance: 5 ohms at 375 Hz
- Maximum SPL: 110 dBA (Pair)
- Crossover Frequency: 1.8 kHz
- Drive Unit Complement: 15 cm Revelator bass/mid transducer, 18 mm Air Motion Transformer
- Power Handling (RMS): 120 W
- Recommended Amplifier Requirements: 25 – 100 W
- Finish: Silver or black finish
- Dimensions: 285 x 195 x 300 mm
- Product Weight: 17 kg per unit
Brand highlights
Taking a step back to look at reviewers' thoughts of the brand's entire lineup—not just this product—what stands out most is the following:
- Metrum products, including those under the Sonnet Digital Audio brand, are designed around the company's proprietary R2R ladder network DAC chips, known as Transient DAC modules, providing a unique approach to digital-to-analog conversion.
- The brand is known for its commitment to non-oversampling (NOS) designs, eschewing oversampling and filtering techniques to preserve the naturalness and musicality of audio signals.
- Metrum implements unique approaches to volume control that maintain signal integrity, utilizing techniques like changing the reference voltage of the DAC modules rather than traditional digital attenuation or analog potentiometers.
Select products
Metrum Onyx
- Positioning: A mid-range non-oversampling DAC designed for home sound systems.
- Description: Uses dual DACTWO chips per channel with parallel FPGA-driven R2R ladder networks for high linearity and clear channel separation. Compared to pricier models like the Pavane and Adagio, it offers solid performance for everyday listening at a moderate budget and suits setups where effective detail and balance are key.
Sonnet Morpheus MK-II
- Positioning: A versatile digital preamplifier DAC suited for integration with sensitive tube designs.
- Description: Adds a -10dB attenuator feature that allows output voltage adjustments, making it flexible for both DAC and preamp usage. Compared to the simpler Onyx and the more feature-rich flagship models, it targets buyers needing adaptable output control for specialized use cases.
Metrum Pavane
- Positioning: A flagship non-oversampling DAC aimed at delivering high-end, refined audio performance.
- Description: Incorporates advanced DAC 2 modules and proprietary forward correction techniques to produce a rich and natural sound with enhanced spatial cues. Compared to the mid-range Onyx and the integrated Adagio, it delivers top-tier sonic detail.
Metrum Adagio
- Positioning: A flagship DAC with integrated volume control that serves as a digital preamplifier for active systems.
- Description: Features dedicated DAC boards with larger, higher voltage transformers and separate toroidal power supplies to maintain low noise and precise volume regulation. In comparison to the Pavane and Onyx, it offers more functionality and controlled performance for users requiring integrated preamp capabilities.
Sonnet Pasithea
- Positioning: A premium DAC and preamplifier built with eight SDA-3 DAC modules for enhanced performance and versatility.
- Description: Delivers improved linearity, lower distortion, and a noise floor markedly lower than the Morpheus by using multiple DAC modules and flexible attenuation options. Compared to all other products in the lineup, it provides superior build quality and maximum sonic resolution in complex and demanding systems.
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Metrum
What if you spend more?
Product Strengths
- Beautiful and solid build quality with a premium feel
- Delivers detailed sound, revealing new aspects in familiar music
- Versatile, suitable for various genres, and easy to set up
- Can fill a medium-sized room with sound, even as a single unit
- Offers wireless convenience with built-in Chromecast and AirPlay 2 support
Product Considerations
- Soundstage can feel flat, lacking depth and nuance in some recordings
- Can sound strained at high volumes
- The Braun app is easy to use, but slim on features
Comparisons (according to reviewers)
- The Naim Mu-so Second Generation scores higher as an all-in-one, despite being more expensive
- The Braun has a more tasteful design and is cheaper, while both have similar specs as the Bowers & Wilkins Formation Wedge
Takeaway: The Braun LE02 is a well-designed speaker that offers a balanced and detailed listening experience, making it great for streaming music. It is an easy-to-use, modern speaker that can bring new life to familiar songs.
Video review
Our take on the brand
Our summary
Product Strengths
- Clear, solid, and refined sound quality
- Conveniently compact and discreet, fitting easily into various spaces
- Feature an AMT-1 Air-Motion Transformer tweeter, which enhances clarity and imaging
- Snappy and agile bass for their size
- Feature every possible modern connection and streaming capability
Product Considerations
- Need a stout power amp to sing
- Lack dynamic variation and punch, making them less musically engaging to some reviewers
- Bass does not reach very deep, so a subwoofer may be needed for those who love bass
- Some reviewers experienced frustrating initial setup with the Piega Control app
- Some off-axis response issues
Comparisons (according to reviewers)
- Vs KEF LS50 Meta: KEF LS50 Meta offer more musicality, dynamic variation, and transparency
- Vs Sonos Era 100: Ace 30 is able to play significantly louder and clearer, and with three to four times more dynamic punch
Takeaway: The Piega Ace 30 are compact and sleek speakers that offer a clear and refined sound, fitting easily into any room, or even function as left and right channels in a compact main stereo setup. If quality sound in a small package is desired, these could be a great fit.
Video review
Our take on the brand
Product Strengths
- Intricately detailed, articulate, and powerful sound across the soundstage
- Astonishing build quality with robust and weighty die-cast aluminium enclosures and a luxurious finish
- The Apex system delivers audiophile standard sound quality without making huge demands on living space
- The inert enclosures enable the Apex to deliver an astonishingly fast and detailed sound
- High frequencies are smooth, speech is clear, and the rear soundstage is expansive
Product Considerations
- Expensive compared to normal compact systems
- The AW12 subwoofer is quite heavy despite its compact dimensions
Comparisons (according to reviewers)
- Apex uses the same tech as Monitor Audio's Silver RX range, but it is 'distilled' down to fit a more compact cabinet size
- Apex is in a different league than other satellite systems, offering a level of sound quality not typically associated with satellite speakers
Takeaway: The Apex system offers detailed and powerful sound, with an astonishing build quality. It is a great choice for those seeking audiophile-level sound in a compact and stylish package.
Video review
Our take on the brand
The DALI FAZON SAT is an elegant and stylish satellite speaker in die-cast aluminium. Its compact size makes it a discreet solution for any stereo, surround sound and TV setup.Die-Cast AluminiumThe organic lines of the die-cast aluminium enclosure combined with enhanced structural integrity, reduced vibration and non-parallel surfaces, are all key elements in the pure, musical tone.Wood Fibre ConesBased on the MENTOR and IKON series, low-loss FAZON series drivers feature low-mass paper cones with wood fibre reinforcement.Curved DesignThe curved lines of FAZON series cabinets eliminate reflections and standing waves.Secure TerminalsEvery speaker in the FAZON series features easy-to-use push button terminals for a secure connection that won't loosen over time.
Product Strengths
- The DALI Fazon Sat has a curved chassis made from dense cast aluminum that does not resonate
- The DALI Fazon Sat has a locking gimbaled mount to point the speaker, and a knurled knob to lock the speaker into position
- The DALI Fazon Sat has a magnetic grille with no visible fasteners
- The DALI Fazon Sat has a simultaneously techy and elegant look
- The DALI Fazon Sat assembles fairly easily, whether wall-mounted or used on the stand
Product Considerations
- The tiny screw terminals on the Fazon Sat for the speaker cables proved a little cumbersome, and limit the use of thin cables
- Although the Fazon Sat's bass response is rated to 86 Hz, its 4 1?2-inch woofer cannot deliver much volume at that frequency without distorting
- A high crossover point is needed to reduce upper bass distortion with the Fazon Sat
Takeaway: The DALI Fazon Sat speakers have great build quality and are easy to mount. They are sleek and will look good in your home.
Video review
Our take on the brand
What competes at this price?
Our Summary
Product Strengths
- High-quality aluminum drivers, including a 1-inch aluminum dome tweeter and a 4-inch aluminum cone mid-bass driver
- Sturdily built with a die-cast aluminum enclosure, contributing to rigidity and reducing internal standing waves
- Small size and aesthetically pleasing, designed to fit into modern lifestyles
- Seamless integration, providing cohesive and organized surround sound
Product Considerations
- Spring-loaded speaker terminals only accept bare wire of relatively light gauges, and they do not accommodate spades or banana plugs
- Bass may be lacking without the addition of a subwoofer
Comparisons (according to reviewers)
- Vs Paradigm Atom Monitors: The MilleniaOne is made with better-quality parts that are more expensive to produce, and sounds better in terms of mids and highs, though the Atoms can get louder
- Vs Paradigm Reference Signature S6 v.3: The Signature system goes deeper and plays noticeably louder, but the Millenia system plays plenty loud and deep for almost anyone in a small to mid-size room
Takeaway: The Paradigm MilleniaOne is a well-built and aesthetically pleasing speaker system that delivers high-quality sound and seamless integration for an immersive audio experience. If great sound in a smaller size is desired and one is willing to pay a bit more, it is worth considering.
Video review
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Our Summary
Product Strengths
- Effortlessly detailed and balanced sound
- Excellent stereo imaging and dynamics
- High-quality Bluetooth streaming
- Simple setup and control
- Multiple connection options, including subwoofer output, digital input for TV, and analog inputs
Product Considerations
- No HDMI ARC for seamless control with TV remote
- No dedicated app for adjusting settings
- Bass output may be lacking for some listeners, potentially requiring a subwoofer
- Grilles are non-removable
- Speakers power down after 20 minutes at rest, requiring manual Bluetooth pairing each time
Comparisons (according to reviewers)
- Compared to Ruark Audio MR1 Mk2, the Q Acoustics M20 sounds fuller, louder and less compressed
Takeaway: The Q Acoustics M20 HD speakers offer detailed, balanced sound and are easy to set up with various devices. They're a versatile audio solution for upgrading sound, whether for music, movies, or gaming.
Video review
Our take on the brand
Our Summary
Product Strengths
- Good ability to get loud, clean sound without distortion or compression issues above 80 Hz when paired with a subwoofer
- Really good build quality cabinet
- Very clear, immediate, vivid sounding speaker
- Ultra-focused sounding, clean, and nicely balanced vocals
- A lot of treble liveliness combined with quality clarity and crispness
Product Considerations
- Treble is a little bit bright
- Not the most neutral speaker
- Leaner sound in terms of bass delivery
- Very tight, tuneful, and on-point bass, but the perceived amount of bass is less substantial than other speakers reviewed
- Some port noise or chuffing can be heard when setting the speakers to deliver as much bass as the Klipsch RP600M
Takeaway: The SVS Prime bookshelf is a sweet little speaker that delivers clear and vivid sound and has great build quality. It's also versatile, as it can be used in a stereo setup or as part of a home theater system.
Video review
Our take on the brand
Our Summary
Product Strengths
- Delivers stereo sound, unlike the Sonos One, due to angled tweeters
- Has a larger woofer, resulting in deeper bass
- Features Bluetooth connectivity, in addition to Wi-Fi and AirPlay 2, offering more flexibility
- Easy to set up and use with the Sonos app, which integrates many music sources
- Includes Trueplay room tuning, now available for Android users, which optimizes the speaker's sound based on its placement in the room, and adjustable EQ
Product Considerations
- The Apple HomePod 2 provides more natural warmth of human voices
- A separate adapter is needed for a wired connection, and it's not included in the box
- Lacks Google Assistant support
- Android users may find the Quick Tuning feature is not as capable as the iOS version
- Isn't designed for outdoor use
Comparisons (according to reviewers)
- Era 100 has better sound quality with cleaner bass and can playback stereo content without downmixing to mono, compared to Sonos One/One SL
- Era 100 is more affordable and compact but lacks Dolby Atmos support, compared to Sonos Era 300
- Era 100 is cheaper but doesn't have a built-in battery for portability, compared to Sonos Move 2
Takeaway: The Sonos Era 100 is a versatile wireless speaker with great sound, enhanced bass, and easy integration with streaming services. It's a solid choice for anyone seeking a compact, all-in-one speaker that delivers both convenience and quality audio for an immersive listening experience.
Video review
Our take on the brand
Every design element of the SVS Ultra Bookshelf speakers was scrutinized to achieve cost-no-object audio performance and build quality to create a groundbreaking bookshelf loudspeaker. Countless design innovations and world-class build materials result in reference sound quality and stunning dynamics normally reserved for the world’s most expensive speakers.
Whether handling the warm and engaging sound of vinyl or the demanding, multi-layered soundtrack of an action movie, the Ultra Bookshelf speakers deliver a powerful and convincing audio experience and are among the top audio investments available at any price.
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Our Summary
Product Strengths
- Nice cabinets
- Fluid and captivating articulation in the mids, with warmth and clarity to voices
- The bass is good enough that one could conceivably get away without ever having a subwoofer
- Excellent clarity and tonal balance
- Able to use so much high-performance technology in products that cost so little
Product Considerations
- Has aluminum wiring
- Lacks a little bit of detail at the very top—kicks, punches, and gunshots do not quite have enough "snap" to them
- Rated at 8 ohms, but in reality, they are 4 ohm speakers
- Do not have magnetic grills, they have a pin-and-cup grill retention system
- Tendency to sound bright with modern pop and electronic music
Comparisons (according to reviewers)
- Compared to the SVS Prime Bookshelf Speaker, it is a noticeable step up in linearity
- The Ultra Towers' performance is beaten by perhaps only one or two other models in the same price range
- The SVS's more laid-back character and natural response remains composed compared to the JBLs, where the JBLs start to lose control and break up
Takeaway: The Ultra speakers are a good value because of their high-quality sound and build that offer performance often found in more expensive speakers. One can enjoy great sound without breaking the bank.
Video review
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