SMSL H400 MK2
L2 · Documented recordChoose H400 MK2 as a high-output analogue headphone amplifier/preamp only after matching gain and load.High-output fully balanced analogue headphone amplifier and preamplifier with three gain levels.
- System role
- Headphone amplifier / preamplifierConfirm the complete connection path
- Documented official version
- No recorded versionNo dated release recorded
- Independent test scope
- No dated SPL test recordedPublished scope and limitations remain separate
- Source checked
- 2026-09-24A source-check date is not a new device test
Updates & issues, along a timeline.
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Firmware & software
No matching public record has been added. This is not proof that no issue or update exists.
Product issues
No matching public record has been added. This is not proof that no issue or update exists.
Complete history: 0 records. Product, brand and update views use the same canonical event identifiers. Event date and source-check date remain distinct.
Where it fits
A desktop analogue headphone amplifier and, where suitable, analogue preamp.
Limits: A DAC, USB interface, streamer, phono stage or speaker amplifier.
Keep the conditions visible
It has no DAC or streamer; its role is analogue gain, volume control and headphone/pre-out service.
Full test scope, specifications & owner feedback ↓Full specifications, test scope, existing assessments & owner feedback
SoundPath Lab · Verified product profile
SMSL H400 MK2
High-output fully balanced analogue headphone amplifier and preamplifier with three gain levels.
Verified data
Category-specific specifications
| Brand | SMSL |
|---|---|
| Model | H400 MK2 |
| Product category | Headphone amplifier / preamplifier |
| Rated headphone power | 18 W/ch at 16 Ω; 9 W/ch at 32 Ω |
| Headphone outputs | 6.35 mm, 4.4 mm and 4-pin XLR |
| Inputs | Balanced XLR and RCA |
| Preamp outputs | Balanced XLR and RCA |
| Gain | Three selectable levels |
Unknown fields are not treated as supported. Services, firmware behavior and regional availability may change after the checked date.
System fit
Best for / not ideal for
Best for
- Demanding full-size headphones
- Balanced desktop systems
- Analogue preamplifier use
Not ideal for
- Users needing a built-in DAC
- Portable use
- Very sensitive IEMs without gain/noise verification
SoundPath verdict
What matters beyond the spec sheet
Strengths
- Dense category-appropriate connectivity
- Official model-level technical specification
Weaknesses
- App, support and long-term ownership evidence remains limited
Biggest limitation
Its very high output makes load and gain matching important for sensitive earphones.
Best alternative
TOPPING A70 Pro as a competing balanced analogue headphone amplifier.
Best-value use case
Demanding full-size headphones
Knowledge graph
Reviews, comparisons, guides and risks
Reviews & explainers
No dedicated review is published yet.
Comparisons
No dedicated comparison is published yet.
Guides
Problems & risks
Firmware
Latest known software status
- Latest known version
- See official support page / tracker
- Updated
- Not separately verified
- Last checked
- 2026-08-23
- Notes
- No separate current version was verified. Check the exact model and hardware revision on the official support page before updating.
Purchase verification
Available channels
Official channel is listed first. No unverified marketplace or variant link is included.
Member knowledge · editor reviewed
Questions, owner experience and product issues
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