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.
All
DA-6
reviews
Manufacturer details
- Efficiency: 92%
- Features: Electronic volume control
- Controls: Bass and Treble adjustment
- Surround Modes: 3 analog
- Construction: Aluminum alloy CNC shell
- Connections: Gold-plated audio connector
- Included Accessories: Remote control
- Colors Available: Black, Silver
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:
- SMSL amplifiers, particularly the AO series, offer a versatile feature set, including USB DAC functionality, Bluetooth connectivity, and subwoofer outputs, making them suitable for diverse audio setups, often at an affordable price.
- They incorporate quality components, such as Infineon Class D amplifier chips, NJRC potentiometers, and TI op-amps, reflecting a deliberate choice to balance performance and cost.
- SMSL DACs often provide a neutral and transparent sound signature, aiming for accurate audio reproduction with excellent detail retrieval.
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Used
SMSL
What if you spend more?
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Classical FET Class A amplifier circuit； The all-aluminum CNC shell, while being beautiful, greatly improves the heat dissipation capacity； The pre amp adopts parallel regulator power supply； Using low distortion, high precision volume control chip PGA2311； The headphone amplifier has 2 gears of gain control； Custom low-noise toroidal transformer manufactured by Noratel, UK； With internal temperature display, better control sound quality； High quality audio socket imported from Japan； A large number of audiophile components, including nichicon KG capacitors； Perfect protection circuit to protect your speakers and headphones； Color high-resolution display；
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Product Strengths
- Sweet midrange and high frequency, common in Class A amplification
- 3D-like sound, offering a more realistic vocal presentation—similar to tube amplifiers
- Impressive imaging, providing pinpoint center imaging, vivid holographic soundstage, and great separation
- Compact size with a quality metal remote
Product Considerations
- It gets very hot, the whole chassis acts as a heat sink, but heat dissipation may not be optimal
- The bass region can sound dull and lacking, especially when paired with certain speakers
- Binding posts are small, which may pose connection issues with chunky cables or large spades
- The volume control mechanism might give the impression of more power than it delivers
- Limited connectivity, with only one RCA input
Comparisons (according to reviewers)
- The A1 is more refined sounding than something like the IOTAVX VX-SA3, but it requires careful speaker pairing due to limited power
- Compared to the Denafrips Ares II, the D1 SE is more detailed, but lacks harmonic richness and soundstaging ability
- It is better than the Emotiva Basics a 100
Takeaway: The VMV-A1 is a compact Class A amplifier with a quality build, delivering enjoyable sound especially in the midrange and high frequencies, suitable for desktop or near-field setups. It is a good option for those wanting to experience Class A amplification without the size or tube maintenance of traditional designs.
Video review
Our take on the brand
Each channel uses 40 pcs, and total 80 pcs selected low-noise op amps in parallel design; The distortion is as low as 0.00006%, and the SNR is as low as 137dB! High output power, 16 ohm output power up to 11.5W, 32 ohms up to 5.5W; Relay Switching Volume attenuator，completely avoid imbalance between the left and right channels! 3 gears gain control, low gain is specially optimized for IEM; Pre-out function, can be used as Hi-End pre-amp; Tempered glass optically bonded IPS display screen Ultra-compact design, very suitable for desktop system; High precision low-temperature drift resistance, performance is not affected by temperature; High-quality relay and non-impact sound design; 20Hz to 100KHz(-0.5dB) frequency response; The headphone amplifier has comprehensive protections such as DC, overvoltage, and overload protection; Built-in high efficiency and low noise power supply system
Product Strengths
- Very sturdy and well-built headphone amplifier made out of aluminum
- Plenty of power and driving capabilities for both high impedance headphones and low impedance planars
- Tonality is well balanced with nothing emphasized or lacking across the frequency spectrum
- Sounds very natural and coherent, with no edgy or rough parts in its performance
- Offers good detail retrieval, separation, and layering of instruments and vocals
Product Considerations
- As a preamp, sound staging isn't particularly wide or deep compared to dedicated preamps
- The black volume knob is described as plasticky and some reviewers wish it was silver to match the chassis
- Lacks a 12V trigger, which would be a much-needed option
- Can run hot
- No auto-standby mode
Comparisons (according to reviewers)
- Vs Topping A90D: SH-X adds a slight hint of warmth in the bass section and is slightly more alive–engaging sounding, while A90D sounds more ruler flat
- Vs aune S17 Pro: SH-X can compete head to head with S17 Pro in 50mA mode, but S17 Pro edges it out in 100mA mode sounding tonally richer and fuller
Takeaway: The SMSL SH-X is a beautifully built and powerful headphone amplifier that offers a clean and transparent sound. It is a great choice for those wanting a high-performing amplifier with versatile connectivity options.
Video review
Our take on the brand
Use the latest DSP chip and ST high power amplifier chip, the distortion at less than 0.0008% USB uses the second XMOS 16-core processor ,support native DSD512 and 32bit 768kHz! Super bass preamp output for connecting active subwoofers to form a 2.1 audio system. Built-in multiple EQ modes and treble / bass adjustment for easy matching of a variety of speakers and music. The latest Bluetooth supports LDAC, APTX / HD, SBC, AAC and the industry's highest specification 24bit / 192kHz UAT format! All aluminum alloy CNC precision processing shell, anodizing technology and chamfering process, exquisite workmanship and delicate touch. Using color LCD screen and newly developed user interface, full-function remote control. A large number of audio grade components are used to enhance the sound experience. High quality gold-plated input and output terminals; Perfect protection circuit for overheating, overcurrent, etc. High quality power specially designed for audio
Our summary
Product Strengths
- Excellent build quality and attractive looking
- Plenty of power and sounds great with near field monitors
- Features a user-friendly menu with customizable sound options like preset EQ modes, bass/treble adjustments, and gain control
- Delivers a balanced tonal delivery and good clarity, allowing the character of the speakers to come through
- Has a DAC inside, Bluetooth, and a subwoofer pre out
Product Considerations
- Has a limited sense of scale and dynamics, which may restrict its use to primarily a desktop scenario
- The upper mid-range can be slightly energetic at times
- Comes with a small fan that is slightly audible when no music is playing
- The A2 takes up a lot of space on the desk
Comparisons (according to reviewers)
- It competes in terms of clarity and even tonality with Audiolab 6000A, but lacks the authority of the Audiolab
- Iota VX SA-3 has greater punch, but cannot match the A2 when it comes to clarity, refinement, and even tonality
Takeaway: The VMV A2 offers excellent build quality and a transparent sound in a compact form factor, making it a good choice as a desktop solution. Its decent connectivity and functionality make it a versatile all-in-one solution.
Video review
Our take on the brand
Fully balanced discrete design for ultra-high power output. The distortion is as low as 0.00006%, and the SNR is as low as 133dB! High output power, 16 ohm output power up to 15W, 32 ohms up to 7.5W; Relay Switching Volume attenuator，completely avoid imbalance between the left and right channels! 3 gears gain control, low gain is specially optimized for IEM; Pre-out function, can be used as Hi-End pre-amp; Tempered glass optically bonded IPS display screen Ultra-compact design, very suitable for desktop system; High precision low-temperature drift resistance, performance is not affected by temperature; High-quality relay and non-impact sound design; 20Hz to 100KHz(-0.5dB) frequency response; The headphone amplifier has comprehensive protections such as DC, overvoltage, and overload protection; Built-in high efficiency and low noise power supply system; Equipped with remote control, full-function remote control.
Product Strengths
- Delivers plenty of power for almost all headphones on the market
- Has a neutral sound signature with good detail retrieval throughout the frequency spectrum
- Balanced output provides greater clarity, instrument separation, and a wider soundstage
- Features a redesigned and modern-looking user interface with simple controls
- Offers clean sound, remote control, and precise volume control, suitable for a wide range of headphones from IEMs to difficult-to-drive models
Product Considerations
- Single-ended output sound is good, but the balanced output is noticeably better—meaning a balanced cable is recommended
- Compared to the Topping A70 Pro, it has less weight and grunt in the bassline
- The volume adjustment process can be a little choppy when using the soft volume control
- Does not have a DAC inside, it is just a headphone amplifier with analog inputs only
Comparisons (according to reviewers)
- Vs Topping A70 Pro: H400 has a quicker, more nimble bass, and a more lively and sparkly sound in the higher frequencies, while A70 Pro is bassier and slightly warmer
Takeaway: The SMSL H400 is a well-built, powerful headphone amplifier that provides great sound quality, especially when using balanced output. It is a great choice for anyone looking for a reliable amplifier with a clean interface and plenty of features.
Video review
Our take on the brand
What competes at this price?
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
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
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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
- The DO400 is a versatile device, serving as a DAC, preamp, headphone amplifier, and Bluetooth receiver
- It offers a highly resolving and transparent sound, with a measured dynamic range of 133dB on its XLR output and 126dB on its headphone output
- It has very tight control over the drivers, sounds quite dynamic and clean, and delivers a punchy sound
- The DO400 features extensive I/O with HDMI, USB, XLR 4-Pins, and Pentaconn 4-Pins
Product Considerations
- It does not have analog inputs, which limits the sources one can pair it with
- The DO400's case cover is steel, and the rotary knob wobbles
- Some may find its sound signature a bit too linear for some genres
- The remote control is plastic-y
- The speedy nature of the ESC by Silicon might result in a less impressive initial kick in the eardrums via headphones, compared to the XLR and RCA outputs
Comparisons (according to reviewers)
- Compared to the Topping DX7 Pro Plus, the DO400 is more organic and dynamic sounding
- Compared to the Topping DX5, the DO400 offers noticeably better line output
- Compared to the Chord Mojo 2, the Chord Mojo 2 sounds better when used as a DAC, offering better detail retrieval and a richer tone timbre, but the DO400 has more power
- Compared to the SMSL SU-9, the DO400 sounds slightly brighter and less-smoothed over—there's an analytical quality to the treble end
Takeaway: The SMSL DO400 is a great-sounding all-in-one unit that offers a lot of features for the price. Its noiseless performance with IEMs and ability to drive most headphones make it a worthwhile purchase.
Video review
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Our Summary
Product Strengths
- 'Ridiculous power for a headphone amp' with 6 watts at 16 ohms and 3 watts at 32 ohms
- Able to drive everything from IEMs all the way through to the most power-hungry headphones
- Very low noise floor
- All-metal chassis with a nice matte-black finish
- Clean, smooth, and detailed sound, without anything to complain about
Product Considerations
- Volume knob is shallow and not particularly enjoyable to grasp
- Can be a little edgy up top with certain headphones
- A little more articulation and crispness at the leading edge of notes would be preferred
- Some found soundstage smaller than expected
- Gain is still a little too high for IEMs
Comparisons (according to reviewers)
- Compared to the SMSL SH-8S, the HO200 has a multi-level gain switch with low, medium, and high and is preamp capable, but the SH-8S is more detailed and textured
- Compared to the Topping A90, the HO200 is a 'baby brother'
- Compared to the JDS Labs Atom Amp, it is a lot more dynamic in bass
Takeaway: The SMSL HO200 is a powerful and versatile headphone amplifier that doesn't sound sterile and boring. It is a solid choice for anyone who wants a clean and detailed sound with enough power to drive a wide range of headphones and IEMs.
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