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
- Exceptional build quality with an elegant, minimalist aesthetic
- Fully balanced design
- Exceptional signal-to-noise ratio (>120dB 'A' weighted)
- Versatile because it automatically converts single-ended inputs to balanced signals
- Dual gain settings for versatility with virtually any headphone impedance
Product Considerations
- May be overkill for entry-level headphones
- The twin-XLR alternative is not the only means of balanced connection
Takeaway: The Musical Fidelity MX HPA is a remarkable piece of equipment that represents a significant achievement in balanced amplification design. It delivers a listening experience that is hard to surpass with technical excellence and practical versatility.
All
MX-HPA
reviews

Manufacturer details
- Output Power: 1.8 Watts per channel into 8 Ohms (27dBW)
- Maximum output voltage: 19 Volts RMS, 20Hz to 20 kHz
- THD+N: >0.005% typical, 20Hz to 20 kHz
- Signal / noise ratio: >120dB 'A'-weighted
- Input impedance: 50k Ohms
- Frequency response: +0, –0.1dB, 10Hz to 20 kHz
- Gain, LO position (volume max): 18db (8x)
- Gain, HI position (volume max): 24dB (15x)
- Line level inputs: 1 pair line level XLR (balanced) connectors, 1 pairs line level RCA connectors
- Headphone outputs: 1 pair 3-pin XLR/¼" stereo Jack combined sockets
- Power requirement: 90-250VAC 50-60Hz universal worldwide supply
- Power Consumption: >0.25 Watts standby (Orange LED lit), 15 Watts maximum (Blue LED lit, full power output)
- Dimensions (WxHxD): 220 x 53 x 240 mm (8⅔" x 2" x 9½")
- Weight: 2.2 kg (5 lbs) unpacked / 3.7 kg (8¼ lbs) packed
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:
- They place a significant emphasis on achieving a distinctive, energetic sound, even at the expense of absolute neutrality, leading to a more engaging and enjoyable listening experience.
- Musical Fidelity often integrates advanced features, like sophisticated equalization or balanced inputs/outputs, into their designs to enhance versatility and cater to audiophiles' evolving needs.
Select products
V90-BHA
- Positioning: The entry-level balanced headphone amplifier in Musical Fidelity's lineup.
- Description: Offers excellent sound quality with balanced audio technology. Features balanced XLR inputs and outputs, which minimize noise and interference, providing a cleaner sound. This makes it ideal for users with a limited budget who want to enhance their headphone listening experience.
M2si
- Positioning: An affordable integrated amplifier designed for audiophiles seeking high-quality sound without extra features.
- Description: Delivers a pure and dynamic sound, drawing on technology from Musical Fidelity's premium models. Stands out with its fully discrete power amplifier and independent power supplies, offering a performance akin to a pre/power configuration in a single unit.
M8xi
- Positioning: A super integrated amplifier, positioned as a high-performance model in the M8 series.
- Description: Known for its powerful and articulate sound, featuring dual mono power amps and a high-quality DAC. It offers significant power output and low distortion. Provides extensive connectivity options, including digital inputs, catering to users with diverse system compatibility needs.
Nu-Vista 800.2
- Positioning: The flagship integrated amplifier in the Nu-Vista series, representing the pinnacle of Musical Fidelity's offerings.
- Description: Combines the unique Nu-Vista tube technology with modern design, delivering an exceptionally smooth and powerful sound. Features dual mono power amps and a locally decoupled output stage, providing remarkable stability and control over any loudspeaker.
Our take on the brand
Look inside the brand
Our interview with the brand
What are two key technological innovations or strong opinions that differ you from other brands?
What's your approach to customer support?
Musical Fidelity (like other Audio Tuning brands) is structured in a pretty traditional way, whereby support and advice are best administered on a local level. Of course, they have a technical team positioned at HQ to help all their partners around the world, and in some more extreme cases you may need to be put straight through to this team. But it's the job of the distributor to support the territory in the best way it can.
What are your favorite tracks for showcasing the strength of your products?
I can tell you this, as we've done this recently for others. These are personal choices:
Simon Quarry – the chief designer – selected these three.
- Low Desert Punk – Brant Bjork
- Moon Love – Electric Moon
- Psychic Chasm – Ozric Tentacles
Heinz Lichtenegger – the brand owner – selected these two:
- Tosca – Puccini, Leontyne Price, Di Stefano, Taddei / Vienna Philharmonic with Herbert von Karajan (Decca, 1963)
- Don Juan – Richard Strauss, Tod und Verklaerung, Also Sprach Zarathustra / Vienna Philharmonic with Herbert von Karajan (Decca, 1960)
What other products pair best with yours?
This is a tough one! Partly because of the diverse range of products on offer from Musical Fidelity. For example, with the A1, we have a lot of success pairing this amp with Klipsch Heresy or Forte IV – but in smaller rooms, our own-brand LS3/5A are a wonderful choice. For Nu-Vista, we pair very nicely with Piega – which requires some deeper power reserves to really get going. So I would say it's very difficult to pair the sonic ID with one brand in particular. Musical Fidelity pairs pretty nicely with a wide range of products, giving customers a great degree of choice.
Used
Musical Fidelity
What if you spend more?
Product Strengths
- Very refined sound signature
- Outstanding output power
- Pleasingly smooth and refined tonal quality with a strong focus on spatial detail, all delivered within a very spacious presentation
- Presents wonderful PRaT (Pace, Rhythm and Timing), injecting loads of dynamics and rendering complex passages with ninja-like speed of attack
- Plenty of I/O options for both source and third-party power amplifiers
Product Considerations
- Non-linear volume curve for demanding headphones
- Beefy desktop amplifier requiring significant table or rack space
- Has only 0.1R O/P impedance on the headphone socket, while the line O/P impedance is still 100R
Takeaway: The Gustard H26 is a high-performing headphone amplifier and preamplifier that provides refined sound and plenty of power. It could be a great addition to a hifi system because reviewers are overwhelmed by the performance compared to the price.
Video review
Our take on the brand
Product Strengths
- Delivers a vividly detailed and balanced sound, handling complicated mixes with skill
- Able to extract a lot of information from digital audio files with apparent ease
- A volume lock prevents accidental volume adjustments when the device is in a pocket or bag
- Extensive specification including Bluetooth 5.4 with aptX Lossless compatibility and multiple inputs/outputs for versatile connectivity
Product Considerations
- Some reviewers feel the device is not very pocket-friendly due to its size and sharp edges, making it better suited as a transportable—rather than a truly portable—device
- The gain is set too high, making precise volume control difficult, especially with sensitive IEMs
- Using IEMatch adds output impedance, which can negatively affect the tonal balance and dynamics of some IEMs
- The length of the included USB-C cable is short, making it difficult to position the device on a desk
Comparisons (according to reviewers)
- Compared to the iDSD Diablo 1, the Diablo 2 offers slight sonic improvements and better build quality, but at a higher price
- Compared to the iDSD Signature, the iDSD Signature is considered by some to offer a better result for less money, with a more realistic instrument and vocal timbre, larger soundstage, and customizable features like crossfeed and bass boost
- Compared to the FiiO Q7, the iDSD Diablo 2 has a vivid sound, where the FiiO Q7 has a smooth and wide sound
Takeaway: The iDSD Diablo 2 is a powerful and versatile DAC/amp that enhances headphone listening with its detailed sound and extensive features. It is a good choice for users who want a high-quality audio experience on the go or at their desk.
Video review
Our take on the brand
When our HYPSOS won an EISA award in 2021, we knew we were on the right track and went on to follow our dreams of delivering the best possible audio gear we could think of. When we learned OOR was chosen by the honorable EISA members as best Headphone Amplifier of 2022-2023, all our dreams came true. As did HYPSOS, OOR is a ground-up design without precedent, created from a profound exploration of analogue audio in its purest form. Understated looks married with sophisticated power delivery and amplifier technologies, delivering ultra-low distortion, huge dynamics and unrivaled detail. For those who want to go even further in unleashing unheard musicality, OOR is, of course, designed to pair perfectly with the HYPSOS Hybrid Power System.
Product Strengths
- Compact size compared to competitors, allowing for easy integration into desktop setups
- The OOR outputs 8 watts of power at 60 ohms and 1.6 watts at 300 ohms, making it one of the most powerful headphone amplifiers ever made
- Low gain setting is silent with sensitive IEMs
- Employs a fully discrete class AB amplifier; there are no op-amps used
Product Considerations
- Simultaneous use of the balanced and single-ended preamp outputs with the main headphone output is an inconvenience
- The unit gets quite warm after a few hours of use—recommending a well-ventilated area
- Powering on the unit requires going from balanced to single-ended
Comparisons (according to reviewers)
- Vs Benchmark HPA4, OOR felt considerably more alive, fleshed out, and natural sounding
- Vs Flux Volot, the reviewers felt that the OOR was more visceral sounding
- Compared to Fluxlab Acoustics, the OOR is a warmer and more soul-infusing amplifier and it never wants to be linear or flat
- Vs Flux Lab Acoustics Volod, it was easily bigger sounding, easily more impressive sounding, just more layered
Takeaway: The Ferrum OOR is a powerful amplifier in a small package, and it is built with great attention to detail. It has an engaging sound with a touch of warmth.
Video review
Our take on the brand
Product Strengths
- Wonderfully enjoyable and transparent sound, described as smooth, resolving, and engaging, enhancing music without coloration
- Open design makes it easy to swap out the tubes
- It opens the soundstage in depth and width, increasing the ability to hear the placement of instruments, and micro details and spatial cues become more accessible
- Versatile, the Velo works well with different headphones (low/high impedance, dynamic/planar)
Product Considerations
- Not particularly powerful, the Velo might require more volume dial rotation compared to other amps to reach desired listening levels
- Bass might sound a little too rounded and lacking texture compared to some setups
- Lacks balanced XLR features
- The included switching power supply is not at the same performance level as the upgraded linear power supply
Comparisons (according to reviewers)
- Vs Linear Tube Audio MZ3: The MZ3 is more resolving and detailed, while the Velo is richer and smoother, the MZ3 is more technically engaging, but the Velo is more emotionally engaging
- Vs Burson Soloist 3X-GT: The Soloist 3X-GT has more power and greater resolution/clarity with a balanced cable, but the Velo is more intimate and relaxing
- Vs Oliver Sayes Type 26 DHT preamplifier: The Velo strikes a nice middle ground between the overly 'emotional' tube stage and the 'straight' sounding TVC mode
- Vs Eddie Current Zana Deux SE OTL: Unlike the Zana Deux, it doesn't go too far in warmth to the point of sounding mushy
Takeaway: The Velo is a versatile tube amplifier that provides a wonderful and enjoyable listening experience by being transparent and smooth. It's designed for music lovers who value emotional engagement with their music.
Video review
Our take on the brand
What competes at this price?
Our Summary
Product Strengths
- Original and stylish design
- High power output, up to 12 watts
- Overload protection
- The XLR, RCA input switch, the headphone amplifier or preamplifier switch, and the low, mid, and high gain switches are located on the back of the unit, potentially making them difficult to access
Product Considerations
- The unit uses 99 low-noise op-amps in parallel, which is considered excessive and potentially detrimental to sound quality
- The unit uses the cheapest balanced potentiometer
- The unit uses a couple of switching power supplies
- The total harmonic distortion is only at its super magical level with a very high wattage
Takeaway: The VMV amp has high power and overload protection that might work to drive headphones. It could be a great amp for someone willing to try it out.
Video review
Our take on the brand
Our Summary
Product Strengths
- Improved battery management offering faster charging rates and better efficiency than its predecessor
- Features a new USB-C data input for greater flexibility alongside other inputs
- Offers the world's first lossless DSP for tone adjustments without degrading sound quality, providing customization options
- Excellent resolution and dynamics with a large soundstage and extreme detail
Product Considerations
- The Mojo 2 can get warm when in a pocket for a period of time
- Complicated menu navigation with color-coded buttons that may require the manual
- Still uses Micro-USB for charging, which some find outdated
Takeaway: The Chord Mojo 2 is an exceptional DAC/headphone amplifier for those seeking high-resolution audio and customized sound in a portable format that is easy to move. Its sonic accuracy, detailed soundstage, and improved features provide a versatile and enjoyable listening experience, making it a worthwhile consideration for audio enthusiasts.
Video review
Our take on the brand
Our Summary
Product Strengths
- Versatile connectivity with both wireless (Bluetooth 5.1 with various codecs) and wired options (USB, S/PDIF, analog inputs) makes it suitable for various setups—from desktop to portable usage
- Eloquent, informative, and entertaining sound quality, able to produce clear, non-artificial sound across different headphones
- Features such as XBass II and XSpace provide additional sound shaping options for the user to customize the sound to their liking
- The aluminum build provides a robust and premium feel, with a design that's described as sleek and comfortable to handle
Product Considerations
- The user interface is not very intuitive
- Decent headphones are needed to reveal its quality
- The OLED screen can be difficult to read
- Battery life is around six to eight hours
Comparisons (according to reviewers)
- Compared to the hip-dac2, the Gryphon offers better sound quality, more features, and flexibility
- Compared to the iFi GO bar, the Gryphon is bigger and has a built-in battery, and the GO bar is much smaller and draws power from the source device
- Compared to the iDSD Diablo, the Diablo has more power for very demanding headphones, Gryphon has more functions
- Compared to the Zen DAC, the xDSD Gryphon has a more sophisticated and detailed sound
Takeaway: The iFi xDSD Gryphon is a portable and versatile device delivering high-quality sound with extensive features that cater to audiophiles. Its ability to improve sound quality from various sources and its robust build make it a worthwhile investment for music lovers on the go.
Video review
Our take on the brand
Our Summary
Product Strengths
- Fully balanced technology, with balanced inputs and outputs.
- Delivers powerful amplification, with up to 7.5 watts of power, capable of driving a wide range of headphones, including hard-to-drive models.
- Features a linear power supply with a large transformer and capacitor bank, providing a stable and powerful power source.
- Provides two current modes (50mA and 100mA) to tailor the sound tonality, allowing users to choose between a more forward/analytical sound and a warmer/fuller sound.
- Employs an R2R network for volume control, ensuring channel balance even at low volumes.
Product Considerations
- Runs quite hot due to its Class A amplification, requiring adequate ventilation, with chassis temperatures potentially reaching up to 50 degrees Celsius, and the unit may switch from 100mA to 50mA mode if it overheats.
- High power output might not be ideal for very sensitive IEMs, potentially limiting volume control flexibility.
- The preamplifier output is always active, meaning it doesn't mute when headphones are plugged in, requiring caution to prevent damage.
- The LCD display cannot be dimmed or switched off, and the red color of the 100mA mode may appear washed out.
- Some report volume slots are not regular or have large jumps, and/or that the remote control can be buggy.
Comparisons (according to reviewers)
- Vs. Topping A90 Discrete: The S17 has a richer sound, wider soundstage, and easier dynamics, especially in 100mA mode, placing it in a higher tier.
- Vs. Topping A90D: The S17 Pro is capable of even stronger dynamic swings, with a slightly cleaner and less cluttered soundstage.
- Vs. Violectric V222: The Aune S17 Pro is more 'tubey' and warmer sounding than the V222.
- Vs. HIFIMAN EF600: The Aune S17 has better volume control, higher dynamic range, better driving power, and better resolution.
Takeaway: The Aune S17 Pro is a powerful and versatile headphone amplifier that delivers rich, detailed sound, allowing listeners to experience music in new ways. With its balanced design and flexible current modes, it can enhance a wide range of headphones and audio setups.
Video review
Our take on the brand
Our Summary
Product Strengths
- Very clean, smooth, and enjoyable sound without harsh edges or digitization
- Plenty of power for a wide range of headphones and IEMs due to its 3.8 watts into a 32 ohm load
- Comes with a linear power supply that provides clean power and minimizes noise
- Includes a remote control that can also control the matching DAC
- Offers versatile connectivity with balanced and single-ended pre-outputs, as well as multiple line inputs
Product Considerations
- 4.4mm connections are used for balanced input/output, which may require purchasing new cables if existing XLR cables are already owned
- The VU meter on the front of the device may not be very useful for normal listening levels
- Settings are not held when the amplifier is turned off
- There is noise in headphones when the unit is turned off or on from standby mode
Comparisons (according to reviewers)
- Vs Burson Audio Soloist 3XP: Champ provides more body and weight to the sound, while the Soloist 3XP offers greater space and separation
Takeaway: The CH-Amp is a compact and versatile amplifier that delivers a clean and enjoyable sound, making it a great choice for those looking for a high-quality listening experience. Its ability to pair well with a variety of headphones and IEMs makes it a worthwhile addition to any setup.
Video review
Our take on the brand
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