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.
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.
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HP12U
reviews
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Manufacturer details
Features
Specifications
- Channel A: 2 × ¼″ (6.3 mm) TRS + Alternate USB Input
- Channel B: Stereo XLR
- Headphones: 12 × ¼″ (6.3 mm) Jacks via Six Class-A Stereo Amplifiers
- Link: 2 × ¼″ TRS Link Outputs
- Nominal Output Power: 680 mW per Channel into 32 Ω
- Frequency Response: 20 Hz – 20 kHz ±0.3 dB @ 100 mW
- Controls: Rotary Volume Knob per Channel, Selectable Input Switch per Channel
- Form Factor: 1U, 19-Inch Rackmount Metal Chassis
- Special Features: USB Computer Port for Digital Connectivity
Description
A robust, rack-mountable (1U, 19-inch) headphone amplifier offering flexible monitoring solutions via dual analog stereo inputs (with one serving as USB) and six stereo output channels, each with dual headphone outputs, plus individual volume controls and selectable source inputs. Ideal for studio, training lab, or multi-listener environments.
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:
- AKG studio headphones are frequently recognized for their wide and immersive soundstage, creating a great sense of depth and accurate placement .
- The brand delivers a near-neutral sound profiles in its headphones, catering to the needs of audio professionals and critical listeners.
- They often utilize a distinctive "hammock-style" self-adjusting headband that equally distributes weight, enhancing comfort for extended listening sessions.
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AKG N5 HYBRID
- Positioning: The entry-level true wireless earbuds designed for everyday portability and effective noise cancellation.
- Description: Features 10mm dynamic drivers with DLC-coated diaphragms, True Adaptive Noise Cancelling controlled by the AKG Headphones app, and immersive spatial audio that delivers clear call quality. Compared to higher-end models like the N9 Hybrid, these earbuds focus on affordability and ease of use while still offering Hi-Res sound for casual listening and light communication.
AKG K371-BT
- Positioning: The mid-range wireless headphone that combines Bluetooth and wired connectivity for studio-style performance on the go.
- Description: Offers a closed-back, foldable design with a built-in microphone and dual connectivity options that cater to both mobile and desktop use. Compared to the N5 Hybrid earbuds, they provide a traditional headphone form factor with enhanced durability and sound isolation, though they deliver fewer advanced audio features than the immersive N9 Hybrid.
AKG N9 HYBRID
- Positioning: The mid-tier over-ear headphone that integrates advanced noise cancelling and Hi-Res audio for extended listening.
- Description: With 40mm dynamic drivers using Liquid Crystal Polymer diaphragms and customizable True Adaptive Noise Cancelling, these headphones offer detailed spatial audio and superior call quality. In contrast to the more compact N5 Hybrid earbuds, the N9 Hybrid is suited for longer sessions in noisy environments while still being more portable than the high-end reference models.
AKG K872
- Positioning: The high-end reference closed-back headphone engineered for critical studio monitoring and mastering.
- Description: Uses 53mm transducers with a 1.5 Tesla magnet system and a two-layer voice coil within an optimized closed-back design to deliver authoritative low frequencies and accurate imaging. Compared to the N9 Hybrid, the K872 prioritizes maximum isolation and reference-grade fidelity for professional monitoring, while offering a robust, durable build for prolonged studio use.
AKG K812
- Positioning: The flagship open-back reference headphone crafted for detailed mixing and high-end audio production.
- Description: Features the largest 53mm transducer ever built by AKG, a powerful 1.5 Tesla magnet system, and an ultra-lightweight two-layer voice coil, delivering pure, natural sound with exceptional spatial imaging. In contrast to the closed-back K872, the K812's open design provides an expansive soundstage and enhanced comfort.
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Avg. Product Price
$500
Used For Sale
0
Available (Scroll Down)
Brand Popularity
809
of 900+
Badges
Top 50 Brand
Top 250 Brand
Products Listed
23
Founding Year
1947
Our take on the brand
AKG pioneered several groundbreaking headphone technologies, including flat-wire voice coils and the Varimotion two-layer diaphragm. The brand also created the legendary C12 tube condenser microphone with its distinctive CK12 capsule and launched the first dynamic cardioid microphone in 1953, earning a Technical GRAMMY Award in 2010 for contributions to recording technology.
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What if you spend more?
Chord Electronics
Mojo 2
650
650
/
65
Reviews
Chord Electronics designs and manufactures all their products in Great Britain, setting themselves apart by using proprietary FPGA technology instead of off-the-shelf DAC chips found in most competitors' products. Their DACs and portable audio devices, featuring distinctive color-changing buttons and portholes, deliver studio-grade performance through unique technologies like the Watts Transient Aligned filter, which provides more natural and detailed sound reproduction.
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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
Chord Electronics designs and manufactures all their products in Great Britain, setting themselves apart by using proprietary FPGA technology instead of off-the-shelf DAC chips found in most competitors' products. Their DACs and portable audio devices, featuring distinctive color-changing buttons and portholes, deliver studio-grade performance through unique technologies like the Watts Transient Aligned filter, which provides more natural and detailed sound reproduction.
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iFi
xDSD Gryphon
599
599
/
30
Reviews
iFi Audio specializes in portable hifi audio players, offering compact DACs and headphone amplifiers for audiophiles seeking quality sound on the go. The brand also provides affordable audiophile gear, making quality hifi audio accessible to more people.
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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
iFi Audio specializes in portable hifi audio players, offering compact DACs and headphone amplifiers for audiophiles seeking quality sound on the go. The brand also provides affordable audiophile gear, making quality hifi audio accessible to more people.
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Bluesound
Powernode
949
949
/
18
Reviews
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.
Bluesound is one of the best entry-level amps if you're looking to dip your toes into hifi. Reviewers love it for what it offers at the price—solid dynamics and tight bass, which is exactly what you expect from good Class D. It’s the go-to pick for people new to hifi since it gives you about 75% of the high-end experience without needing a ton of power. It’s perfect for smaller setups where you want good sound without going all-in on expensive gear.
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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
Bluesound is one of the best entry-level amps if you're looking to dip your toes into hifi. Reviewers love it for what it offers at the price—solid dynamics and tight bass, which is exactly what you expect from good Class D. It’s the go-to pick for people new to hifi since it gives you about 75% of the high-end experience without needing a ton of power. It’s perfect for smaller setups where you want good sound without going all-in on expensive gear.
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Bluesound
Powernode Edge
549
549
/
17
Reviews
Add a little extra power with the POWERNODE EDGE, the perfect entry point into “just add speakers” HiFi for the streaming age, combining streaming sources, control, and amplification all in one place. Audiophile-grade componentry capable of up to 24 bits/192 kHz hi-res audio, and wireless multi-room capabilities with smartphone controls combine to make the POWERNODE EDGE a great ‘building block’ amplifier to start, extend or complete a hi-res streaming audio system of any size.
Bluesound is one of the best entry-level amps if you're looking to dip your toes into hifi. Reviewers love it for what it offers at the price—solid dynamics and tight bass, which is exactly what you expect from good Class D. It’s the go-to pick for people new to hifi since it gives you about 75% of the high-end experience without needing a ton of power. It’s perfect for smaller setups where you want good sound without going all-in on expensive gear.
Expand Details
Our summary
Product Strengths
- Compact design makes it easy to fit in small spaces, like desktops or shelves
- Extensive streaming capabilities via the BluOS app are included, with support for popular services like Tidal, Spotify, and Amazon Music
- Produces a clean, clear, and capable sound with good detail
- Easy to set up and use, making it an accessible entry point for those new to hifi audio streaming
- A variety of connectivity options are offered, including HDMI eARC, optical/analog input, USB, and Ethernet
Product Considerations
- A headphone port is lacking
- Sound lacks outright nuance, dynamics, and punch compared to some rivals
- The BluOS app is required for full control, which might be a drawback for some
- The unit's maximum file resolution support is 24-bit/192kHz PCM, lower than some competitors
- Performance may be limited by the speakers connected to it
Comparisons (according to reviewers)
- Vs Bluesound Powernode (2021) — The Edge has halved the power output and lacks a headphone port compared to the Powernode (2021)
- Vs Technics SA-C600 — The Powernode Edge is not as musically expressive or deft with dynamics as the Technics SA-C600
- Vs Triangle AIO Twin — The Triangle AIO Twin is more entertaining, and is a complete system—speakers included
- Vs WiiM Amp — The WiiM Amp offers many features of BluOS and Chromecast
Takeaway: The Powernode Edge is a compact and versatile streaming amplifier that provides a great entry point into high-quality audio streaming for many. Its ease of use and comprehensive feature set make it a solid choice for modern music systems.
Video review
Our take on the brand
Bluesound is one of the best entry-level amps if you're looking to dip your toes into hifi. Reviewers love it for what it offers at the price—solid dynamics and tight bass, which is exactly what you expect from good Class D. It’s the go-to pick for people new to hifi since it gives you about 75% of the high-end experience without needing a ton of power. It’s perfect for smaller setups where you want good sound without going all-in on expensive gear.
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What competes at this price?
AKG
HP4E
159
/
Released
A compact, 4-channel headphone amplifier housed in a rugged half-rack (½U) metal chassis, designed for small to medium studio applications. It includes two stereo analog inputs, four stereo outputs (each with dual jacks), front-panel input switching per channel, and high-quality audio performance even at elevated volume levels.
AKG pioneered several groundbreaking headphone technologies, including flat-wire voice coils and the Varimotion two-layer diaphragm. The brand also created the legendary C12 tube condenser microphone with its distinctive CK12 capsule and launched the first dynamic cardioid microphone in 1953, earning a Technical GRAMMY Award in 2010 for contributions to recording technology.
Expand Details
Our Summary
Video review
Our take on the brand
AKG pioneered several groundbreaking headphone technologies, including flat-wire voice coils and the Varimotion two-layer diaphragm. The brand also created the legendary C12 tube condenser microphone with its distinctive CK12 capsule and launched the first dynamic cardioid microphone in 1953, earning a Technical GRAMMY Award in 2010 for contributions to recording technology.
Product Page
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iFi
GO blu
199
/
Released
2021
With Hi-Fi inspired architecture featuring dedicated Bluetooth, DAC, and Amp stages, the ultra-portable GO blu offers the best of both worlds – wireless freedom, paired with the clarity of wired sound.
iFi Audio specializes in portable hifi audio players, offering compact DACs and headphone amplifiers for audiophiles seeking quality sound on the go. The brand also provides affordable audiophile gear, making quality hifi audio accessible to more people.
Expand Details
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
iFi Audio specializes in portable hifi audio players, offering compact DACs and headphone amplifiers for audiophiles seeking quality sound on the go. The brand also provides affordable audiophile gear, making quality hifi audio accessible to more people.
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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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Expand Details
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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