S.M.S.L H400 MK2 Flagship Headphone Amplifier and Preamplifier
The S.M.S.L H400 MK2 represents the pinnacle of high-end desktop amplification, combining ultra-high driving power with uncompromising audio engineering. Designed for discerning audiophiles and demanding headphone setups, it delivers master-grade resolution, exceptionally low distortion, and an expansive soundstage that brings every nuance of your music to life.
Ultra-High Power Output Architecture
Engineered to effortlessly drive the most demanding low-impedance planar magnetics and high-impedance dynamic headphones, the H400 MK2 delivers a massive output power of up to 15W per channel into 16 ohms, 7.5W into 32 ohms, and reliable high power for 300-ohm and 600-ohm loads. This immense headroom ensures absolute control, explosive dynamics, and pristine tonal balance across any headphone.
Ultra-Low Distortion and Pristine Signal Integrity
To ensure absolute signal purity, the H400 MK2 achieves an astonishingly low Total Harmonic Distortion plus Noise (THD+N) of 0.00006% (-123dB) alongside an ultra-high Signal-to-Noise Ratio (SNR) and dynamic range of up to 133dB. This specialized circuit topology eliminates background hiss, allowing the subtlest micro-details of your recordings to emerge with crystalline clarity.
Comprehensive Balanced and Single-Ended Headphone Outputs
To accommodate a wide array of personal audio gear, the H400 MK2 features a versatile selection of professional headphone outputs, including 4.4mm balanced, 4-pin XLR balanced, and 6.35mm single-ended jacks. Combined with an optimized output impedance design, it delivers transparent, uncolored amplification tailored to any transducer.
Advanced Multi-Level Gain Control
The unit incorporates a sophisticated multi-level gain control system tailored independently for balanced and unbalanced outputs. With meticulously tuned Low, Medium, and High gain stages, it provides precise volume matching and optimal sensitivity control whether you are pairing it with highly sensitive IEMs or power-hungry full-sized headphones.
High-Performance Preamplifier Functionality
Beyond serving as a world-class headphone amplifier, the H400 MK2 functions as a high-end preamplifier equipped with both balanced XLR and unbalanced RCA line outputs. It integrates seamlessly into high-end desktop speaker systems or dedicated stereo setups, delivering pristine volume control and signal distribution.
Premium CNC Aluminum Construction
The chassis is precision-milled from a solid block of high-grade aluminum using advanced CNC machining techniques. This robust enclosure not only offers a sleek, modern industrial aesthetic that elevates any desktop setup, but also provides exceptional structural rigidity and superior shielding against external electromagnetic interference.
Comprehensive Analog Connectivity
Designed as the ultimate analog control center, the H400 MK2 offers a full array of professional inputs and outputs:
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Balanced XLR Inputs: For pristine, interference-free connection with high-end DACs.
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Unbalanced RCA Inputs: For universal compatibility with standard audio sources.
- Multiple Headphone & Preamp Outputs: 4.4mm, XLR, 6.35mm, and line-out options for maximum versatility.
About SMSL
Foshan ShuangMuSanLin Electronics Co., Ltd. (SMSL) is an established manufacturer in high-fidelity desktop audio. Specializing in digital-to-analog converters, balanced headphone amplifiers, and power amps, SMSL has built a global reputation for combining rigorous bench performance, clean industrial design, and practical feature sets across various price tiers.
Technical Specifications
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Inputs: 1x Balanced XLR, 1x Unbalanced RCA
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Headphone Outputs: 4.4mm balanced, 4-pin XLR balanced, 6.35mm single-ended
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Preamp Outputs: Balanced XLR, Unbalanced RCA
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Output Power: 15W x 2 (16Ω), 7.5W x 2 (32Ω), 1000mW x 2 (300Ω), 550mW x 2 (600Ω)
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THD+N: 0.00006% (-123dB, 1kHz, 32Ω)
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SNR / Dynamic Range: 133dB
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Frequency Response: 20Hz – 100kHz (-0.5dB)
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Dimensions: 254 × 46 × 189 mm (W × H × D)
- Weight: 2.03 kg
Q&A
What is the maximum output power of the SMSL H400 MK2?
It delivers up to 15W per channel into 16-ohm loads and 7.5W per channel into 32-ohm loads.
What headphone output connections are available?
It features 4.4mm balanced, 4-pin XLR balanced, and 6.35mm single-ended headphone outputs.
Can the H400 MK2 be used as a preamplifier?
Yes, it features both balanced XLR and unbalanced RCA line outputs, allowing it to function as a high-end preamplifier.
What is the Signal-to-Noise Ratio of this amplifier?
It features an exceptional SNR and dynamic range of up to 133dB.
