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
- Hallmark purity and neutrality characteristic of output-transformerless (OTL) amplifiers.
- Extraordinary bass performance with tight focus, definition, and layering, especially when matched with the right speakers.
- Expansiveness of soundstage and extension on top.
- Sound is open and fast, with good frequency extension at both ends of the audioband.
- Virtually bulletproof; it can withstand being turned on without speakers connected
Product Considerations
- Careful speaker matching (eight ohms or higher) is recommended for best performance.
- Output impedance is approximately 4.1 ohms, which is rather high, and could interact with an irregular speaker impedance to produce frequency-response variations
- Produces a lot of heat and should be placed where they'll be well ventilated.
- Plugging into a power conditioner may limit the current it feeds to the amps
Comparisons (according to reviewers)
- Vs Audio Research VS115—Atma-Sphere has superior bass and speed.
- Vs Atma-Sphere S-30 Mk.3—the M-60 Mk.3.1 sounds somewhat sweeter, more relaxed, and less mechanical.
Takeaway: The Atma-Sphere M-60 is an amplifier that brings you closer to the music by removing a layer of grunge. With its purity, neutrality, and extraordinary bass, it offers a captivating listening experience.
What are hifi reviews useful for? (1) Identifying products you should demo in person at a dealer. (2) Learning which products reviewers unanimously praise as the best they've heard (this means they probably are legitimately great). (3) Identifying a product's attributes that satisfy your idiosyncratic needs and tastes. Beyond that, we often discount what reviewers say because they heap praise on most products—and are often apprehensive about publishing strong criticism or comparisons between products. Further, they seldom have more than a few products on-hand, often relying on their memories to compare past products. Always listen for yourself.
All
M-60
reviews
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An excellent review of a great product
/
Publisher
/
3/1/2022
An excellent review of a great product
Publisher
/
3/1/2022
Video Review
Manufacturer details
Features
Specifications
- Output power: 60 watts per channel into 8 Ω load, 45 watts per channel into 4 Ω load, 80 watts per channel into 16 Ω load
- Input Impedance: 100 KΩ single-ended, 200 KΩ balanced
- Output Impedance: ~4.1 Ω
- Input Sensitivity: 3 V (for full output)
- Tube complement: 8 x 6AS7G output tube (per channel), 4 x 6SN7 driver tube (per channel)
- Gain: 20dB (for 8 Ω)
- Power Bandwidth: 2Hz-75KHz within ½ dB
- Frequency response: 1Hz-200KHz within 3 dB
- Power supply storage: 140 Joules (per channel)
- Total Harmonic Distortion: typically 1% at full power
- Intermodulation distortion: typically under .04% at full power
- Phase shift: less than 1° @ 20KHz
- Output section risetime: 600 V/µs
- Feedback: 1 dB
- Power consumption: 300 watts (per channel)
- Dimensions: 13" deep x 17" wide x 8" tall (33 x 43 x 20 cm) per chassis
- Weight: 30 lbs (13.6 kg), per chassis, without tubes
Description
For years now the M-60 in its various forms has been the subject of the Soundstage! Hall of Fame Award, The Absolute Sound Golden Ear Award and Editor's Choice, with numerous accolades in the press and on the web. The M-60 Mk. 3.3 continues that tradition with classic styling and its award-winning state-of-the-art performance. The M-60 gives you the features and precision performance of our larger models in a beautiful, 60-watt package. The amp operates class A and is unconditionally stable with reliability proven over many years.
For years now the M-60 in its various forms has been the subject of the Soundstage! Hall of Fame Award, The Absolute Sound Golden Ear Award and Editor's Choice, with numerous accolades in the press and on the web. The M-60 Mk. 3.3 continues that tradition with classic styling and its award-winning state-of-the-art performance. The M-60 gives you the features and precision performance of our larger models in a beautiful, 60-watt package. The amp operates class A and is unconditionally stable with reliability proven over many years. The power tubes are inexpensive, readily available and do not require any matching. Sporting a classic, open-chassis construction, the M-60 Mk. 3.3 sets the bar for hi-end amplifier performance.
Release Timeline
Manufacturer Site
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:
- Atma-Sphere's designs center around "Balanced Differential Design," ensuring fully balanced circuits in every component for enhanced signal purity.
- As an output transformerless (OTL) amplifier manufacturer, they are known for designs which avoid output transformers, resulting in faster response and a more direct connection to the music.
- Atma-Sphere's Class D amplifiers offer a solid-state option with the goal of replicating the smoothness of their tube amplifiers while improving efficiency and reducing distortion.
Select products
Select product comparisons
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.
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Avg. Product Price
$500
Used For Sale
11
Available (Scroll Down)
Brand Popularity
282
of 900+
Badges
Top 50 Brand
Top 250 Brand
Products Listed
9
Founding Year
1976
Our take on the brand
Atma-Sphere pioneered the Output TransformerLess (OTL) amplifier design and created the first balanced-line preamplifier, the MP-1, both of which eliminate common audio components that can reduce sound quality. Their products are handcrafted and made-to-order with hand-selected components, and while traditionally known for tube electronics, they recently introduced their first solid-state Class-D GaN Mono Amplifiers.
Look inside the brand
Brand Page
Our interview with the brand
What are two key technological innovations or strong opinions that differ you from other brands?
One thing that distinguishes us from other manufacturers is our craftsmanship. Open the amp or preamp up and it’s pretty obvious when compared to our competition. We also price according to a formula rather than what the market will bear, so our equipment tends to be less expensive. Of course, we are well known for our OTLs. We have also embraced balanced line operation longer than anyone else in high-end audio with the first balanced line preamps ever made for home audio.
What's your approach to customer support?
We handle customer support directly if we can. It’s nice if a dealer can do it for us, but quite often they get in over their head, so we recommend the customer contact us directly if at all possible. We stand behind our products and support amps and preamps we made a long time ago with an update program that allows the older product to meet the specs of the new with a new warranty. We’re not picky about the length of the warranty and have warranted equipment that was well out of the regular warranty period.
What are your favorite tracks for showcasing the strength of your products?
I like to play a variety of tracks to show off our gear. We made a recording called Canto General which, because I was there, I like to use as a reference since it will tell me how well a system is imaging, how well it’s handling voices and bass, as well as dynamic contrast. We issued it on LP and CD. The CD is still available, but the LP was only 1,000 pressed and sold out a long time ago. Otherwise, I like to play stuff that shows off the bass. One recording I use for that is Remotion by Global Communication. Female voice is often requested at shows, so I might put on something by Pentangle on the TransAtlantic label, or The Secret Garden by the John Renbourn Group.
What other products pair best with yours?
Our MA-2s get used a lot with Sound Lab ESLs. The M-60s get used a lot with older Quad ESLs and horn systems. Our preamps work nicely with most power amps that have a true balanced input, like Pass Labs.
From our interview with
Ralph
.
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Atma-Sphere
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What if you spend more?
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Our summary
Product Strengths
- Half-width size is desirable for storage, as two units can fit side-by-side on a typical hifi shelf
- Strong dynamic profile, dimensionality, and power for most performance speakers on the market
- Bass is much more controlled, and leading edges are significantly more defined, compared to the previous version
- Vocals feel lifelike and tangible
- Possesses a nice overall tone and a well executed lack of dryness or 'thin' character
Product Considerations
- A single Aegir 2 box delivers audiophile fun with efficient setups, but shines best in a dual mono two amp situation
- The top of the unit does heat up slightly with use
- May not be the perfect choice for high demand electrostatics
- Requires a balanced connection from the pre amp to bring out the best from the setup
- Takes a little longer to boot up compared to the original Aegir
Comparisons (according to reviewers)
- Vs Schiit Vidar: The Aegir 2 has a sound that is more rich and thick, but still defined
- Vs Aegir G1 (original): The Aegir 2 has increased dynamics and low end control compared to the original
Takeaway: The Schiit Audio Aegir 2 is a fun power amplifier that offers a strong dynamic profile and nice overall tone. It brings dimensionality and sufficient power for most performance speakers, making it an enjoyable addition to any audiophile setup.
Video review
Our take on the brand
Schiit Audio, an extremely popular direct-to-consumer hifi brand, specializes in entry-level DACs and amps for both headphones and speakers. Through their distinctive, authentic voice and low-price philosophy, they've built a very loyal customer base.
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Topping
LA90
799
799
/
10
Reviews
Topping Audio is a measurement-focused hifi brand that developed its own proprietary PSRM DAC architecture and NFCA amplifier topology to achieve exceptionally low distortion levels. Their products, from the flagship D90 III Discrete DAC to entry-level interfaces like the E2x2, use advanced technologies like custom I/V conversion stages and high-feedback Class B designs to deliver clean, accurate sound reproduction.
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Our summary
Product Strengths
- Delivers a clean and detailed sound, allowing listeners to hear nuances in recordings
- Offers good instrument separation and imaging
- Has a low noise floor, creating a 'black background' and enhancing the listening experience
- Compact size for an A-B amplifier
- Does not have RCA inputs, requiring XLR or TRS balanced connections
Product Considerations
- May not have enough power for inefficient speakers or large rooms
- External power supply 'brick' is large
- No remote control
Comparisons (according to reviewers)
- The LA90 has a more neutral sound than Cambridge Audio AXA25, which is cleaner and more detailed
- The LA90 comes close to Benchmark AHB2's performance, but does not outperform it in bass impact and soundstage size, and the AHB2 also has more protection systems
- The LA90 offers more vocal clarity and fuller bottom end than Schiit Vidar, but the Vidar is more exciting on top
- Emotiva A1's have more power
Takeaway: The Topping LA-90 Discrete is a small amplifier that produces very clear sound with good detail, making it great for those who already have balanced audio equipment. It could be a nice upgrade for those seeking to hear all the subtleties in their music.
Video review
Our take on the brand
Topping Audio is a measurement-focused hifi brand that developed its own proprietary PSRM DAC architecture and NFCA amplifier topology to achieve exceptionally low distortion levels. Their products, from the flagship D90 III Discrete DAC to entry-level interfaces like the E2x2, use advanced technologies like custom I/V conversion stages and high-feedback Class B designs to deliver clean, accurate sound reproduction.
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Topping
LA90 (Discrete)
799
799
/
9
Reviews
Topping Audio is a measurement-focused hifi brand that developed its own proprietary PSRM DAC architecture and NFCA amplifier topology to achieve exceptionally low distortion levels. Their products, from the flagship D90 III Discrete DAC to entry-level interfaces like the E2x2, use advanced technologies like custom I/V conversion stages and high-feedback Class B designs to deliver clean, accurate sound reproduction.
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Product Strengths
- Impressive specs and measurements showcase extremely low noise and distortion
- Clean and transparent sound aims for a neutral reproduction of music
- Compact size and sleek design make it suitable for small spaces
- CNC machined aluminum chassis allows for maximum thermal flow to keep the unit running cool
Product Considerations
- Included external power supply is large and heavy, which can be a challenge to hide
- Power output may be limiting, especially with demanding speakers and for high dynamic range tracks
- Bass performance, while tight and controlled, may lack sub-bass extension and impact for some listeners
- Lack of a remote control limits its convenience as an integrated amplifier
Comparisons (according to reviewers)
- The Discrete version matches the Topping LA90 IC based unit's exemplary performance, but betters it in power handling
- The Topping LA90 comes close to the Benchmark AHB2 in noise floor and detail retrieval, but the AHB2 has more power, impactful bass, and a bigger soundstage
Takeaway: The Topping LA90 is a compact and technically proficient amplifier that delivers a clean and transparent sound and with impressive specs. It is best suited for those with efficient speakers and a preference for accurate sound reproduction without coloration.
Video review
Our take on the brand
Topping Audio is a measurement-focused hifi brand that developed its own proprietary PSRM DAC architecture and NFCA amplifier topology to achieve exceptionally low distortion levels. Their products, from the flagship D90 III Discrete DAC to entry-level interfaces like the E2x2, use advanced technologies like custom I/V conversion stages and high-feedback Class B designs to deliver clean, accurate sound reproduction.
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Our summary
Product Strengths
- Bass performance is taut, detailed, and well-dampened
- Delivers a neutral presentation overall
- Has a solid steel chassis and milled aluminum faceplate
- The A1 is able to drive low impedance speakers with power and grandeur
- Produces 200 watts into 8 ohms and 325-350 watts into 4 ohms
- Only has a single line-level RCA-style input
Product Considerations
- Audible tweeter hiss may be present at idle, especially with highly efficient speakers
- High frequencies are not as smooth at the edges, exhibiting just faint traces of grain when listening at above-average levels
Comparisons (according to reviewers)
- Vs Rotel 1592 MkII amp: A1 is notably quieter and more detailed
- Vs Crown XLS Drive Core 2 amps: A1 is equally neutral in tone, has a lower noise floor, and a more consumer-friendly design
- Vs Schiit Vidar: A1 has a larger soundstage
Takeaway: The BasX A1 monoblock amplifier delivers good power and a neutral sound signature. It is a great option for those looking to expand an existing AVR or build a cost-effective hi-fi system.
Video review
Our take on the brand
Emotiva is a direct-to-consumer hifi brand that enables audiophiles to customize their amplifier configurations through a modular "Build Your Own" approach, using their Differential Reference design to minimize noise and distortion.
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What competes at this price?
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Burson
Funk
491
/
Released
2021
Hi-Fi companies are spoiling headphone enthusiasts with a wide range of choices, but they often overlook near-field audiophiles who listen to speakers in small studios or from their desktops. Instead, near-field audiophiles are left with subpar Class-D amps or active speakers. Alternatively, they have to settle for larger Class-AB amps that disrupt the aesthetic of their setups. The Burson Funk breaks that rule by offering a combination of exceptional performance and a design that fits seamlessly into any living space.
Burson is a hifi brand recognized for its modular op-amp design that allows users to easily swap components to customize their sound signature.
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Our Summary
Product Strengths
- Good sound quality, especially in the midrange, leads to vivid and well-formed vocals
- Versatile, it works well with both efficient headphones/IEMs and moderately powered speakers
- Compact design and good build quality, with the chassis acting as a heatsink
- Ability to roll op amps allows users to customize the sound signature
- Ample power for most headphones and nearfield speaker setups
- Only one RCA input, which may be limiting for some users
Product Considerations
- Speaker amplifier power (35-45W) might be insufficient for power-hungry speakers or larger rooms
- The base model op amps are sonically inferior to upgrade options
- Mild turn-off thump present
Comparisons (according to reviewers)
- The Funk has a narrower but deeper soundstage with better imaging and layering than the Arylic A08 Pro
- The Funk has superior imaging, but less potential power output depending on the Arylic's power supply than the Arylic A07/A08 Pro
- The Funk is preferred for desktop speaker setups with Vivid opamps when compared to Schiit Aegir
Takeaway: The Burson Funk is a solid choice for people wanting good sound from both their headphones and speakers in a single, convenient unit. The ability to change the sound by swapping op amps is a welcome feature for those who like to tinker and upgrade.
Video review
Our take on the brand
Burson is a hifi brand recognized for its modular op-amp design that allows users to easily swap components to customize their sound signature.
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Fosi
ZA3
129
/
Released
2023
The next generation balanced dual-mode Class-D power amplifier. Fosi Audio's first amplifier supporting both stereo and mono modes.
Fosi Audio makes quality hifi accessible worldwide by offering a diverse range of amplifiers, preamps, and DACs that blend modern engineering with vintage-inspired design. Their products are engineered for versatility and power, serving both audiophiles and gamers with impressive performance at competitive prices. With a strong reputation built on solid reviews and customer focus, Fosi Audio stands out as a go-to brand for enthusiasts seeking exceptional sound without breaking the bank.
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Our Summary
Product Strengths
- Great value for the money and an attractive price point
- Balanced input and single-ended RCA input
- Op amps are swappable
- Compact form factor
- Versatile with stereo and mono mode
Product Considerations
- The volume control was found to be touchy by some reviewers
- The included power brick is quite large, almost as big as the unit itself
- The binding posts are small
- The RCA input sounds inferior to the XLR input
- The amplifier does not high pass the mains when a subwoofer is plugged in
Comparisons (according to reviewers)
- Vs Fosi Audio V3: ZA3 is considered a more mature version with stylistic elements and new features like balanced inputs and mono mode, with a naturalness in the tonal quality
- Vs SMSL AO200 MKII: AO200 MKII delivers better clarity, definition, and resolution of the sound
Takeaway: The ZA3 is a versatile and compact amplifier that offers great value, especially for those starting their audio journey. Its ability to be used in both stereo and mono configurations and the option to upgrade components make it a flexible choice for various setups.
Video review
Our take on the brand
Fosi Audio makes quality hifi accessible worldwide by offering a diverse range of amplifiers, preamps, and DACs that blend modern engineering with vintage-inspired design. Their products are engineered for versatility and power, serving both audiophiles and gamers with impressive performance at competitive prices. With a strong reputation built on solid reviews and customer focus, Fosi Audio stands out as a go-to brand for enthusiasts seeking exceptional sound without breaking the bank.
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Our Summary
Product Strengths
- Excellent build quality, featuring a CNC milled aluminum chassis and durable construction
- Achromatic Audio Amplifier (AAA) technology by THX, aiming for transparent sound reproduction without coloration
- Relay volume control provides precise channel matching
- Plenty of power to drive a wide range of headphones, from sensitive IEMs to demanding planars
- Balanced XLR inputs and outputs
Product Considerations
- No pre-amp output
- The notched volume control might not be to everyone's liking
- Gets quite warm during use, especially with the SU-9 DAC stacked on top
- Some reviewers noticed a clicking noise when adjusting the volume
- The three-feet design may not be as stable as a four-feet design
Comparisons (according to reviewers)
- Vs. SMSL SP200: Better unit at repelling noise, with a higher signal-to-noise ratio and lower total harmonic distortion—completely solved the SP200's issue with not having a pitch-black background
- Vs. Benchmark HPA4: Very close to the HPA4 in performance, with some minor differences observed only with high-end headphones
Takeaway: The SMSL SH-9 is a well-built and powerful headphone amplifier with a clean, transparent sound. It is a good choice for audiophiles looking for an accurate and detailed listening experience.
Video review
Our take on the brand
SMSL, a Shenzhen-based hifi brand, stands out for its use of advanced chipsets like Infineon's MERUS and ES9039Q2M, which have been objectively verified to deliver exceptionally low noise and distortion levels. The brand has earned acclaim from value-conscious audiophiles.
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SMSL
HO100
217
/
Released
2022
HO100 Headphone Amplifier features an ultra-low distortion precision feedback circuit with distortion as low as 0.00006%, and an ultra-low noise power supply design that outputs noise as low as 1.3uV.
SMSL, a Shenzhen-based hifi brand, stands out for its use of advanced chipsets like Infineon's MERUS and ES9039Q2M, which have been objectively verified to deliver exceptionally low noise and distortion levels. The brand has earned acclaim from value-conscious audiophiles.
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Our Summary
Product Strengths
- Budget-friendly headphone amplifier focused on quality
- Robust all-aluminum exterior, with rigid toggle switches, and smooth volume control, giving it the same fit and finish as SMSL's higher-end HO200
- Delivers a clean, neutral, and transparent sound, faithfully reproducing the source audio without adding coloration
- Extremely low noise floor
- Versatile due to its three gain levels (low, mid, high) and its ability to drive both sensitive IEMs and harder-to-drive headphones
Product Considerations
- Lacks balanced and unbalanced outputs for connecting to powered speakers, functioning solely as a headphone amplifier
- Does not have preamp capability
- Reviewers have noted average microdetails
- While the design looks smart and subdued, the tempered glass panel easily grabs fingerprints, requiring frequent cleaning
Comparisons (according to reviewers)
- Vs SMSL HO200: HO100 lacks RCA/XLR outputs and has lower wattage, but is more compact and is preferred if the extra power and outputs are not needed
- Vs FiiO K5 PRO: It has better driving power, a lower noise floor with IEMs, and lower distortion at maximum volume
- Vs JDS Labs Atom+: It has higher maximum power, handles maximum volume better with lower distortion, and offers better overall detail in the micro detail, and a more relaxing signature
Takeaway: The SMSL HO100 is a compact yet powerful headphone amplifier that delivers clean, neutral sound suitable for various headphones. It is well-built and offers excellent value for audiophiles seeking a high-quality listening experience.
Video review
Our take on the brand
SMSL, a Shenzhen-based hifi brand, stands out for its use of advanced chipsets like Infineon's MERUS and ES9039Q2M, which have been objectively verified to deliver exceptionally low noise and distortion levels. The brand has earned acclaim from value-conscious audiophiles.
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Topping
A90 Discrete
499
/
Released
2022
Topping Audio is a measurement-focused hifi brand that developed its own proprietary PSRM DAC architecture and NFCA amplifier topology to achieve exceptionally low distortion levels. Their products, from the flagship D90 III Discrete DAC to entry-level interfaces like the E2x2, use advanced technologies like custom I/V conversion stages and high-feedback Class B designs to deliver clean, accurate sound reproduction.
Expand Details
Our Summary
Product Strengths
- Very clean, articulate, and detailed sound
- Plenty of power and headroom for difficult headphones
- Includes a remote control, a ground loop switch, and a mini-LED display
- Exceptional build quality
- Good bass and instrument separation
- Includes connectivity options
Product Considerations
- Can sound a bit too bright or lean, potentially sterile with already bright headphones
- Lacks the soundstage depth found in some other discrete designs
- Some reviewers experienced issues with the 6.35mm headphone jack turning off or popping when connecting/disconnecting
- When driving IEMs, enabling the Safe volume mode setting is needed
- Little to no resistance when turning its wheel
Comparisons (according to reviewers)
- The Singer SA-1 is more natural and lifelike for solo piano, while the A90D emphasizes clarity and detail
- The A90D has better bass and instrument separation than the Geshelli Labs balanced E2
- The A90D has more detail and clarity than the HIFIMAN EF-400, but the EF-400 is warmer
- The A90D may have more detail than the Audio-gd Master 9 and R8 combination, but the Audio-gd has a warmer, richer sound and more 3-dimensional soundstage
- It features improved power, dynamics, and a shift from ultra-linear to more fun, colorful, and natural sound than the Topping A90
Takeaway: The Topping A90D is a solid amplifier with clarity, detail, and power that can drive most headphones. It may be worth considering if a clean and articulate sound is desired, especially with warmer headphones, and a preamp with a remote is needed.
Video review
Our take on the brand
Topping Audio is a measurement-focused hifi brand that developed its own proprietary PSRM DAC architecture and NFCA amplifier topology to achieve exceptionally low distortion levels. Their products, from the flagship D90 III Discrete DAC to entry-level interfaces like the E2x2, use advanced technologies like custom I/V conversion stages and high-feedback Class B designs to deliver clean, accurate sound reproduction.
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