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.
Product Strengths
- Natural driving power with nice bass control
- Cleaner, more precise, and more balanced sound signature over the entire frequency range
- Power delivery is precise, effortless, and natural
- Delivers sound with utmost honesty, control, and definition, making human voices sound natural and realistic
- The tonality is flawless with superb color management in midrange, benefitting classical, blues, jazz and similar genres
Product Considerations
- Does not perform optimally when pushed beyond its limits, which may limit those who prefer loud listening or have larger rooms
- May sound somewhat unexciting with warmish-sounding speakers
- Some controls only function when the appropriate option board is installed
- The large knobs now feature gold-plated trims, and the large display area with analog VU meters has differently machined edges
Comparisons (according to reviewers)
- Compared to McIntosh MC12000, the E-4000 has a cleaner, more precise, and balanced sound signature
- Compared to the E480, the E4000 has better sound quality and overall performance like noise performance
- Compared to the Denon PMA-S611, the E-4000 provides a more refined sound signature, especially in bass control, definition, and micro detail
- Compared to the E5000, the E-4000 offers more clarity in the vocal midrange
- Compared to the Luxman L500 7Z, the E-4000 has stronger power usage
Takeaway: The Accuphase E-4000 delivers precise and natural sound reproduction, making it a great tool to enjoy music. It is designed to provide a luxurious listening experience with its exceptional build quality and advanced features.
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.
A-48S
- Positioning: The entry-level Class A stereo power amplifier in Accuphase's lineup.
- Description: Offers excellent sound quality with its 6-parallel push-pull MOS-FETs, providing 50 W into 8 ohms. Compared to the A-80, it has a slightly lower power output but maintains a high damping factor of 1,000, making it suitable for small to medium-sized rooms and those with a moderate budget.
A-80
- Positioning: A mid-range Class A stereo power amplifier, developed as a stereo version of the A-300.
- Description: Delivers a refined sound with its 10-parallel push-pull MOS-FETs, offering 65 W into 8 ohms. It provides more power than the A-48S.
P-4600
- Positioning: A mid-range Class AB stereo power amplifier in Accuphase's lineup.
- Description: Features 6-parallel push-pull power transistors, delivering 150 W into 8 ohms. It offers a higher power output than the A-80, with a damping factor of 800.
A-300
- Positioning: A high-end Class A monophonic power amplifier, marking Accuphase's 50th anniversary.
- Description: Features 20-parallel push-pull power MOS-FETs, providing 125 W into 8 ohms. It offers superior performance compared to the A-80.
P-7500
- Positioning: The flagship Class AB stereo power amplifier in Accuphase's lineup.
- Description: Uses a 10-parallel push-pull power transistor architecture, delivering 300 W into 8 ohms. It surpasses the P-4600 in power and performance, with a damping factor of 1,000.
Read the reviews

Manufacturer's notes
- Power Output: 180 watts into 8 ohms / 260 watts into 4 ohms
- Damping Factor: 800
- Configuration: Four-fold parallel push-pull
Our take on the brand
Used
Accuphase
What if you spend a bit more?

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

The Bluesound POWERNODE is the HiFi amp reinvented for the streaming age, combining audiophile-grade componentry and multi-room music capabilities to create an intuitive “just add speakers” hi-res sound system for modern music lovers. The compact minimalist exterior disguises 2 x 80 watts of award-winning HiFi amplification, a premium hi-res DAC design, and access to all the music ever recorded with a tap in our BluOS Controller app for smart devices and laptops.
Our Summary
Product Strengths
- Punchy and musical performer
- BluOS is a treat to operate
- Convenient design as a source and amplifier in one, only needing speakers to complete the system
- Engagingly musical performer—dynamically fluid and punchy, with plenty of energy
- More neutral sounding now, making gains in clarity and insight across the frequency range
- Connectivity options are through 3.5mm headphone-type connectors, shared with mini-TosLink connections
Product Considerations
- Tough competition from other streaming amplifiers
- No way to send data out to an external DAC
- The Powernode was occasionally hard on transients and dynamic bursts
- There is no included remote
Comparisons (according to reviewers)
- The Marantz has a wider-scale, roomier soundstage and greater subtlety
Takeaway: The Bluesound Powernode is a superb streaming amplifier that is better than ever, offering excellent sonic talent and a well-rounded feature set. It provides a convenient and high-quality music experience for anyone looking to simplify their home audio setup.
Video review
Our take on the brand
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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
What else competes at this price?

Our Summary
Product Strengths
- Detailed and expansive presentation, offering a sonic upgrade to phones, especially when portability is a priority
- Versatile, with both wired and wireless connectivity options, including balanced and unbalanced headphone outputs
- Impressively small size and lightweight design, making it pocket-friendly and convenient for on-the-go use
- Sound quality is generally linear, with fast and accurate bass, flat and clean mids, and a detailed treble that is not harsh
- XBass and XSpace features offer customized listening experiences
- Build quality and aesthetics are generally well-received, with its design standing out from other devices
- ChronoDial volume knob is particularly praised for its tactile feel and functionality
Product Considerations
- Black rubberized plastic casing can feel a bit flimsy to some users
- Some reviewers noted hiss with sensitive IEMs, especially on the balanced output
- Battery life estimation can be unreliable
- No dedicated app for the device, limiting EQ and DSP options
- Lacks a clip, making it less convenient for truly portable use
Comparisons (according to reviewers)
- Compared to the Audiolab M-DAC Nano, the Go Blu offers a wider soundstage, better separation, and dynamic sensitivity, though the M-DAC Nano is fractionally punchier in the bass
- Compared to the AudioQuest DragonFly Cobalt, the Go Blu is a wireless proposition, unlike the DragonFly Cobalt, which is a USB plug-in DAC
- Compared to the FiiO Q3, the iFi GO blu highs are a bit too brilliant, but everything else sounded quite impressive
- Compared to the NuPrime Hi-mDAC, the iFi GO Blu mids sound a lot like it, even if voices are slightly less natural
- Compared to the Hidizs S9 Pro and Aune BU2, the GO Blu provides a relaxed sound and has better build and functionality compared to the Hidizs S9 Pro, but is better when using bluetooth compared to Aune BU2, however when competing on wired terms, the Aune is clearer
Takeaway: The iFi GO blu is a tiny but mighty device that delivers impressive sound and versatility—improving the wireless music experience. It is easy to use and has some cool features, making it a good pick for anyone looking for a portable upgrade for their headphones.
Video review
Our take on the brand

Our Summary
Product Strengths
- Good build quality for the price, with an all-metal chassis and tight inputs
- Versatile, with multiple connection options: USB Type-C, optical, coaxial, and RCA outputs
- Offers bass and treble controls to adjust the sound to the listener's liking
- Decent power output for most headphones, especially within the 32-250 Ohm range
- Great value for the price, especially considering its features and versatility
Product Considerations
- Some reviewers experienced technical issues with initial units, raising concerns about reliability
- May not provide enough headroom for all headphones, even with efficient ones
- Bass adjustment can muddy the sound if turned up too much
- The internal DAC is considered mediocre by some, not very resolving
- There can be a slight noise floor audible with sensitive IEMs
Takeaway: The FIIO K5 is a versatile and affordable device that enhances the audio experience with different headphones and devices. It has multiple inputs and EQ controls, which are beneficial for gamers and music lovers.
Video review
Our take on the brand

Our Summary
Product Strengths
- Versatile as both a headphone amplifier and preamplifier
- Features bass, mid, and treble tone controls for customized sound
- Offers a loudness button to enhance bass and treble at low volumes
- Has a built-in battery for transportable use
- Powerful output to drive various headphones
Product Considerations
- Not ideal for highly sensitive IEMs due to potential hissing at higher volumes
- Size and weight may limit practical portability
- No DAC, relies on external DAC
- Tone controls reduce power output
- The potentiometer is a little bit on the cheaper side, there is a slight bit of channel imbalance when at very low volume
Takeaway: The Fosi Audio SK01 is a versatile and powerful headphone amplifier with tone controls, making it easy to customize audio and drive various headphones, and its battery and preamp functionality are perfect for those seeking a transportable and flexible audio solution
Video review
Our take on the brand

Our Summary
Product Strengths
- Delivers a neutral and transparent sound signature, providing an accurate representation of the source material
- Offers plenty of power for its size, capable of driving even demanding bookshelf speakers without losing composure
- Features built-in EQ presets and bass/treble tone controls for customizing the sound
- Built with high-quality materials, featuring an aluminum alloy chassis that is both durable and lightweight
- Has versatile connectivity options, including balanced XLR inputs, RCA inputs, USB input, and Bluetooth
Product Considerations
- Internal DAC and Bluetooth performance are underwhelming compared to the amplifier section
- The stock SBC Bluetooth codec limits wireless audio streaming quality
- EQ settings can be confusing and require some experimentation to dial in a balanced sound
- The volume knob might be slightly wobbly
- The power cord could be too short for some setups and might need to be replaced
Comparisons (according to reviewers)
- The MKII offers nearly double the power output and sounds more dynamic than the SMSL AO200 (original)
- Compared to the Yamaha A-670, the AO200 MKII offers more detail and soundstage, though the Yamaha is warmer and more forgiving
- The AO200 MKII has higher driving power, a more dynamic sound, and lower distortion than the Arylic A50+
- The AO200 MKII offers a more palpable and lifelike sound than the Topping PA5
- The AO200 MKII has better driving power at times, better EQ with no degradation, and is a better value than the Burson Funk
Takeaway: The SMSL AO200 MKII is a compact and powerful stereo amplifier with a neutral sound, making it a solid option for those who want clean sound, plenty of connectivity options, and customization features. It is a good value that can improve the sound of many speaker setups.
Video review
Our take on the brand

Our Summary
Product Strengths
- Phenomenal sound quality.
- Very usable and enjoyable interaction due to a physical volume knob.
- Plenty of power for almost everything and can drive just about anything.
- Versatile; it can be used as a desktop all-in-one, a Bluetooth portable DAC/amp, a portable amplifier, and even a DAC for speakers.
Product Considerations
- Susceptible to EMI noises, which can be a deal breaker; static noises, pops, and crackle sounds can occur when a phone is placed directly on top of it.
- Not a completely balanced architecture; the 3.5mm & 4.4mm headphone outputs sound the same.
- Charging port may not indicate charging on anything higher than an 18W charging block, and some chargers may not work.
Comparisons (according to reviewers)
- Vs FIIO BTR-7: Sounds more refined and has more detail and resolution.
- Vs SMSL C200: The C200 sounds significantly warmer with a fuller, juicier bass line and a little bit more airy, while the G5 is more focused on clean and clear edges, tidy, well-focused—and clean.
- Vs SMSL M500 MK2: The M500 MK2 sounds overall better with dynamics at the same level as the G5 and fuller, warmer tonality—and a bigger, more spacious soundstage.
- Vs Moondrop Moonriver 2: The treble is more refined, better details up top, and a sharp edge without being overboard like the Moonriver 2 can.
Takeaway: The G5 is a well-built and versatile portable DAC/amp with a neutral, clean, and dynamic sound. It is great for those looking for an all-in-one solution that can drive almost any headphone or IEM.
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.
Product Strengths
- Natural driving power with nice bass control
- Cleaner, more precise, and more balanced sound signature over the entire frequency range
- Power delivery is precise, effortless, and natural
- Delivers sound with utmost honesty, control, and definition, making human voices sound natural and realistic
- The tonality is flawless with superb color management in midrange, benefitting classical, blues, jazz and similar genres
Product Considerations
- Does not perform optimally when pushed beyond its limits, which may limit those who prefer loud listening or have larger rooms
- May sound somewhat unexciting with warmish-sounding speakers
- Some controls only function when the appropriate option board is installed
- The large knobs now feature gold-plated trims, and the large display area with analog VU meters has differently machined edges
Comparisons (according to reviewers)
- Compared to McIntosh MC12000, the E-4000 has a cleaner, more precise, and balanced sound signature
- Compared to the E480, the E4000 has better sound quality and overall performance like noise performance
- Compared to the Denon PMA-S611, the E-4000 provides a more refined sound signature, especially in bass control, definition, and micro detail
- Compared to the E5000, the E-4000 offers more clarity in the vocal midrange
- Compared to the Luxman L500 7Z, the E-4000 has stronger power usage
Takeaway: The Accuphase E-4000 delivers precise and natural sound reproduction, making it a great tool to enjoy music. It is designed to provide a luxurious listening experience with its exceptional build quality and advanced features.
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