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.

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.

Product Strengths

• Objectively an excellently performing amplifier with a discrete design and potentially lower noise floor than op-amp based designs
• Subjectively has a slightly bass-focused, full-bodied sound, with a focus on the texture of midrange elements, leading to a more natural vocal presentation
• Offers excellent value for money, competing with Far East manufacturers on both performance and pricing
• Has plenty of power to drive most headphones, including high impedance models
• Features both single-ended and balanced inputs/outputs and can be used as a preamplifier

Product Considerations

• The volume knob may have a scratchy feel
• The halo feedback design may not make a significant difference in terms of measured behavior of headphones
• Protection circuit may kick in and limit power at lower impedances
• Preamp outputs cannot be switched off when using headphones

Comparisons (according to reviewers)

• Vs Schiit Magni+, the Midgard offers better clarity and separation, especially when using the balanced output, but the tonal balance is similar
• Vs Schiit Asgard 3, the Midgard is more neutral and clarity-focused, while the Asgard 3 is warmer and richer, with a better sense of soundstage depth
• Vs Topping A30 Pro, the Midgard offers a resolution and finesse that the A30 Pro cannot reach—being more natural, open and fun
• Vs Schiit Jotunheim 2, both are similar in terms of overall sound quality, but the Midgard stands out because its midrange is stuff from legends
• The Midgard is a magnificent improvement compared to the Schiit Magnius

Takeaway: The Midgard is a powerful and versatile headphone amplifier with a balanced, full-bodied sound that is well-suited for many headphones. Its discrete design and excellent value make it a worthwhile upgrade for audiophiles.

Product Strengths

• Enjoyable overall presentation with a punchy bassline, slightly euphonic midrange, and crystalline treble response
• Expansive soundstage that allows the music to breathe and come to life
• Enough power to drive most moderately hard-to-drive headphones, even those with higher impedance
• Detailed and textured vocal range that is a touch more forward and warmer than clinically accurate
• Tactile controls allow quicker access to changing any of the settings on the device

Product Considerations

• Slight bright tilt, which may require careful pairing with other components
• Bass is present, but slightly rolled off
• Lacks a screen, which some users may find to be a downside
• Balanced connection is present for convenience, as the amplifier itself is not a differential design—meaning it's single-ended by nature

Comparisons (according to reviewers)

• SMSL SH-8s bass tends to be a touch more forward, SMSL SH-9 delivers a slightly tighter bass line
• The SMSL SH-9 has a markedly more controlled treble response
• Both have similar power output at 16Ω, but Topping A30 Pro maintains higher power at 32Ω
• The SMSL SH-8s has a fuller instrument timbre, but Topping A30 Pro has a more euphonic vocal range
• The SMSL SH-8s has much bigger headroom, and feels more spacious compared to the Geshelli Labs Archel 2.5 Pro
• The SMSL SH-8s is clearly digging more details, and is also able to develop a wider soundstage with better separation and layering than the Topping L30

Takeaway: The SMSL SH-8s is a well-built amplifier that sounds promising. If the listener has darker sounding headphones or a darker source, the SMSL SH-8s might be worth checking out to open the sound a little bit.

Product Strengths

• Multiple analog and DSP-free modes are featured
• Class A circuitry is designed for flagship iCAN Phantom
• XBass+ and XSpace analog signal processing modes are included
• It can drive a wide range of headphones, including xMEMS IEMs and high-end planars, with up to 2000mW output
• Build quality is robust and durable with a premium aesthetic

Product Considerations

• The included generic power adapter is a disappointment
• XBass+ can sometimes be overpowering, and XSpace might artificially widen the soundstage
• The amp may be too powerful for very sensitive IEMs, giving little volume control in these situations
• Some reviewers found the sound profiles not to audiophile tastes
• The 4.4mm Pentaconn input/output can be somewhat limiting and costly

Takeaway: The ZEN CAN 3 is a versatile amp with a robust build and unique features like XBass+ and XSpace, making it a good choice for those seeking enhanced sound without digital processing. It is great for gaming, movies, and music listening.