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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