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
Magazine reviewers and YouTubers have tried this product—so we've summarized their strongest opinions below.
Compared to their other products
We think it's helpful to understand how this product fits into the brand's full lineup (below). To learn more about these products, visit the brand's page.
MA-1
- Positioning: The entry-level amplifier designed for compact and simple setups.
- Description: Uses a straightforward circuit and build with essential connectivity that makes it ideal for small rooms and modest sonic goals. Compared to the MP-3 or MA-3, keeps costs low while delivering the basic functions needed for everyday audio without additional features.
MP-3
- Positioning: A mid-range solution that balances simplicity with added digital and connectivity features.
- Description: Offers a cleaner digital processing design and improved signal clarity compared to the MA-1, making it a step up for users seeking more control. In contrast with the higher-tier MA-3, M-60, and GEM, provides moderate performance improvements and connectivity enhancements.
MA-3
- Positioning: A higher-performance amplifier aimed at audiophiles requiring refined audio detail.
- Description: Integrates advanced circuitry and improved power supply management to deliver a richer sound compared to both the MA-1 and MP-3. When compared with the more powerful M-60 and flagship GEM, offers a balanced mix of technical upgrades and connectivity options.
M-60
- Positioning: A robust integrated amplifier built for larger environments and more versatile functionality.
- Description: Uses a more sophisticated design with higher power output and expanded connectivity that distinctly outperforms the MA-3 in handling larger room acoustics. Relative to the lower-priced models, provides additional technical features and a broader suite of functionalities.
GEM
- Positioning: The flagship model delivering the most advanced audio performance in the lineup.
- Description: Incorporates groundbreaking technologies and premium components that ensure unmatched clarity and dynamic range compared to the M-60 and all other models. In contrast to every other product in the series, its refined build, extensive functionality, and top-tier performance are aimed at users with high budget tolerance and demanding sonic goals.
Read the reviews
Atma-Sphere MA-2
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Manufacturer's notes
- Output power: 220 watts per channel into 4, 8 or 16 Ω load before clipping
- Input Impedance: 100 KΩ single-ended, 200 KΩ balanced - selectable to 600 Ω
- Output Impedance: ~1.75 Ω (open loop)
- Input: Selectable up to 600 Ω; 2.8 V sensitivity RCA and XLR true balanced input
- Tube complement: 20 x 6AS7G output tube (per channel), 6 x 6SN7 driver tube (per channel)
- Gain: 26 dB (for 8 Ω)
- Power Bandwidth: 2Hz-150KHz within 1/2 dB
- Frequency response: 1Hz-200KHz within 3 dB
- Power supply storage: 1200 Joules in output section (per channel), 100 Joules in Driver supply (per channel)
- Total Harmonic Distortion: typically 0.4% at full power
- Intermodulation distortion: typically under .04% at full power
- Phase shift: less than 1 degree @ 20KHz
- Output section risetime: 600 V/µs
- Feedback: 2 dB
- Power Supply Current: 80 Amps/channel
- Power consumption: 800 watts (per channel)
- Dimensions: 28" deep x 17" wide x 10" tall (71 x 43 x 25 cm) per chassis
- Weight: 103 lbs (46.7 kg), per chassis, without tubes
Our take on the brand
Used
Atma-Sphere
What if you spend a bit more?
Since its introduction in 2022, Apex has been hailed as the finest power amplifier ever created. Critics and connoisseurs have universally praised its combination of shattering power and sublime delicacy; its ability to drive any loudspeaker balanced with unimpeachable tonal neutrality. It has always been Gryphon’s mission to achieve the highest possible audio performance in terms of sheer musicality, transparency and realism. With Apex Mono and Apex Stereo, Gryphon Audio Designs has elevated pure Class A power amplification a titanic leap above what was previously considered possible. Gryphon Apex takes us several significant steps closer in the quest for the most natural and convincing musical illusion.
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Our Summary
Product Strengths
- Delivers lots of current due to a new 2000VA toroidal transformer
- The Apex Stereo's ease of presentation was immediately obvious—it fully engaged the reviewer
- The amp exuded supreme self-confidence
- The amp simultaneously speeds things up and slows things down
- Superior speaker grip, improving organization, timing, and musical flow
Product Considerations
- Initial start-up can be alarming due to flashing error lights
- The size and weight (445 lbs) can make installation challenging
- It's gigantic and heavy, requiring special equipment and tools to handle its production
Comparisons (according to reviewers)
- Vs Boulder 2060: The Apex revealed more tonally saturated sounds
- Vs Boulder 2060: Apex cast a larger soundstage, and within those huge spaces, images were generally larger and more three-dimensional
- Vs Boulder 2060: Apex exposed more detail in the music
Takeaway: The Gryphon Apex Stereo is a powerful amplifier that brings music to life with a balanced and full sound at any volume. Its ability to reveal the resonant nature of instruments transforms listening sessions into immersive experiences.
Video review
Our take on the brand
The company's inaugural creation, the Momentum Mono Amplifier, served as the foundation for its product line. The Momentum M400 MxV Mono Amplifier, the latest iteration, enhances the iconic design to new heights. Incorporating techniques and topologies from the Relentless Mono Amplifier, the Momentum M400 MxV models represent the pinnacle of Momentum circuitry evolution. The new model name, MxV, signifies Mass times Velocity—the fundamental equation for Momentum, a recognition that resonates particularly with individuals having a physics background. Explore the cutting-edge Momentum M400 MxV for an unparalleled audio experience.
Our Summary
Product Strengths
- Exquisite aesthetics with a sleek design and a power meter that glows green
- Delivers a smooth and satisfying sound
- The sound is described as 'louder' and more powerful
- Said to be able to drive any speaker to its maximum output
- Upgrades are retrofittable to earlier Momentum models
- Balanced input only
Product Considerations
- Runs warm
- The scale on the power meter is essentially uncalibrated
- Requires a return to the factory for MxV upgrades on earlier Momentum Models
Comparisons (according to reviewers)
- The Momentum M400 MxV incorporates technology from the Relentless line and gets very close to the Relentless sound regarding space and depth
- The Momentum M400 MxV is smaller and lighter than the Karan Acoustics POWERa mono
- The Momentum M400 MxV is smaller and lighter than the D'Agostino Progression M550 Mono amplifier
Takeaway: The Momentum M400 MxV monoblock is a beautifully designed and powerful amplifier that delivers a smooth and satisfying listening experience. It incorporates technology from the flagship Relentless model, making it a top-tier choice for audiophiles.
Video review
Our take on the brand
Our Summary
Product Strengths
- Fully balanced design, handcrafted in the USA
- Employs a sextet of KT170 valves, ECC83, and 6H30, with hand-selected and matched valves
- Features Audio Research's 'Auto-Bias' circuitry and an internal hour meter for monitoring valve usage
- Aesthetically elegant design with unique 'Ghost Meters' which are LED-illuminated and can be dimmed or switched off
- Capable of delivering high power at low frequencies, controlling and driving speakers like a big solid-state amplifier
Product Considerations
- High price point
- Requires a 20A IEC cable (supplied)
- The bass control and sheer bass output of the Gryphon Audio Antileon EVO (solid state) could not quite be matched by the Reference 330M
- The unit use a variable speed fan, although it was essentially silent during testing, this may still present a point of concern for some users
Comparisons (according to reviewers)
- Vs Gryphon Audio Antileon EVO: The Gryphon Audio Antileon EVO (solid state) has slightly better bass control and output
Takeaway: The Audio Research Reference 330M is an intelligently engineered and beautifully styled amplifier that embodies the meaning of 'Reference' in sound quality. Its powerful valve design delivers excellent performance and is sure to be a conversation piece in any high-end audio setup.
Video review
Our take on the brand
Possessing formidable power, unrivalled technology and a herculean appearance this amplifier delivers electrifying signals to your loudspeakers, transforming your music into a thrilling experience.
craftsmanshipLow frequencies are faithfully reproduced without a whiff of constraint. Spellbinding vocals have astonishing reality and territory around them.
Monopolizing your leisure time, the addictive clarity and power of each musical note, riveting you into a state of blissful abandonment.
Highly skilled craftspeople take enormous pride in hand building each amplifier, scrupulously checking and testing every parameter, so your enjoyment is forever untroubled.
Power on tapUnprecedented power is yours to unleash, delivering an astonishing musical performance. Concealed within the crafted exterior lurks a gargantuan 2300VA mains transformer delivering mountainous levels of current to feed your musical hunger.
Accomplishing the largest crescendos turns into child's play with 272,000uF of electrical brawn just itching to be discharged.
Reassuringly cool, even under your most sustained inclination to blast away the cobwebs, it is gratifying so much power is on tap.
Our Summary
Product Strengths
- Build quality is among the best, with all pieces fashioned from solid aluminum
- The system delivers an effortless and truly reference-level sound
- Produces deep and powerful bass that energizes the room with ease
- Offers stunning analogue playback with incredible soundstaging, holographic image, depth, and width
- Delivers music with startling clarity across all genres
Product Considerations
- The Reference Preamplifier lacks a remote, focusing on a purist design
- The Reference Three speakers are very heavy—weighing 100kg net
Comparisons (according to reviewers)
- The Avid Hifi Reference system performed similarly well with Fanfare for the Common Man, producing impressive bass and dynamics, compared to the YG Acoustics system with Boulder
Takeaway: The AVID HiFi Reference system is a top-tier system delivering exceptional sound quality and effortless power. It is designed to provide an extremely enjoyable and immersive music experience, making it a worthwhile investment for serious audiophiles.
Video review
Our take on the brand
What else competes at this price?
Our Summary
Product Strengths
- Very clean and noise-free output signal provides a stable soundstage with a very black background at any sound level
- Exceptional bass control and depth delivers a powerful and tight bass response that underpins the overall musical experience
- Offers flexibility with mono, stereo, and bi-amping operating modes, allowing for system upgrades and configuration changes
- Dynamic and fast, reacting instantaneously to the signal it receives and delivering power and subtlety where needed
- Continues the company's aesthetic with the massive perspex front panel covering
Product Considerations
- Speaker binding posts may not be compatible with all types of speaker cable terminations, specifically thicker spades
- The control for the illuminated 'E' on the front is located underneath the amp and may be difficult to access
- May be more 'laid-back', which some may interpret as lacking ultimate transparency or strict neutrality
- Provides only for XLR balanced inputs, though Electrocompaniet can provide appropriate high-quality adaptors for RCA connectors
Comparisons (according to reviewers)
- Brings another level of control and depth to everything, compared to Totaldac Amp 1
- The memorable blackness of bass pinged recognition, compared to Kinki Studio EX-B7 monos
Takeaway: The Electrocompaniet AW 800 M is a powerful and versatile amplifier known for its exceptional bass control, clean output, and dynamic performance. It is a great choice for audiophiles seeking a high-quality listening experience with flexibility for system configuration.
Video review
Our take on the brand
Our Summary
Product Strengths
- Incredibly resolving, with plenty of detail
- Perfectly controlled, 'wide' sound in terms of dynamics and panorama
- A quieter background brings forward a level of detail
- A clearly structured form, with symmetrical divisions and repetitions
- Inspired by the Relentless Epic amplifier series
Product Considerations
- Speaker jacks accept only spades and bare wires, and connecting spades from the top bends the cable significantly
- Components on the rear panel are placed close to each other and not particularly convenient to use
Takeaway: The Momentum S250 MxV amplifier delivers an immersive and detailed listening experience, making it great for those who enjoy actively listening to music. It brings out the best in loudspeakers, offering tremendous dynamics and a wide soundstage.
Video review
Our take on the brand
Our Summary
Product Strengths
- Delivers a complete and unabridged rendition of music, offering a sense of authority and positively influencing the sound
- Presents music as a tightly unified whole, creating a singular event rather than a collection of individual sounds
- Offers beautifully balanced and poised sound across the entire frequency range, from deep bass to detailed highs
- Maintains steady output voltage regardless of changes in load, defying mains input variations, thanks to the Utopik power supply
- The Adaptive Bias Control (ABC) technology establishes and adjusts bias current in real time
Product Considerations
- The high price dictates that all other system components (source, pre-amplification, speakers, supports) need to be of similarly high quality and expense
Takeaway: The Linn Klimax Solo 800 is an uncompromising amplifier that allows one to hear their music in a new light by delivering a complete picture of the sound. It offers exceptional clarity, balance, and control over the music signal.
Video review
Our take on the brand
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Our Summary
Product Strengths
- Transparent and uncolored
- Exceptional casework and styling
- Ample power without muscularity becoming the product's defining attribute
- Utterly effortless and transparent magnification of the electrical impulse
- Allows a listener to devote their psychic energy to making an emotional connection to music
- Only has balanced inputs
Product Considerations
- Only has balanced inputs
Takeaway: The Ferios monoblock power amplifiers are some of the best electronics available, combining immediacy, transparency, and tonal beauty. Its ability to effortlessly resolve complex arrangements makes it a worthwhile choice for serious audiophiles.
Video review
Our take on the brand
Our Summary
Product Strengths
- Visually oriented towards the flagship 159 amplifier
- Combines power and elegance with distinctive cooling fins
- Impressive sovereignty in music reproduction, outstanding spatial resolution, and musical warmth
- Solid build quality and finish
- Effortless control of any loudspeaker due to high damping factor over the entire frequency range
Product Considerations
- One review mentioned one of the amps began to buzz, which could be transformer-related
- RCA-to-XLR adapters may be needed for some preamps, since the 218 uses XLR inputs
- Absence of protruding support feet may make it difficult to lift without risk of crushing fingers
- The size and mass make it a 'sit on the floor' device
Takeaway: The Burmester 218 is a luxurious and well-engineered amplifier with a sound that's easy to enjoy and delivers the spirit and emotion of the music. It's a good choice for listeners who want a combination of detailed sound and easy listening.
Video review
Our take on the brand
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
Magazine reviewers and YouTubers have tried this product—so we've summarized their strongest opinions below.
Want to see more similar products?
Head on over to our Search page to browse our entire database. Find the perfect hifi gear for your system.
How to buy
Amplifiers
Questions? Ask this brand's dealers.
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