SMSL
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The SMSL H400 MK2 is a fully-balanced, Class A headphone amplifier built for audiophiles who refuse to compromise. Featuring 14 premium OPA1612A op-amps and a fully symmetrical circuit architecture, the H400 MK2 delivers an exceptionally clean, powerful, and neutral sound signature — making it one of the most capable desktop headphone amplifiers in its class.
14x OPA1612A Op-Amps | Fully-Balanced Architecture | Class A Operation | Balanced XLR & 4.4mm Output | Ultra-Low Distortion | Dual Gain Modes
The H400 MK2 deploys an array of 14 Texas Instruments OPA1612A op-amps — widely regarded as one of the finest audio op-amps available. This configuration ensures ultra-low noise, exceptionally low distortion, and a wide dynamic range, providing a transparent and faithful reproduction of your music with no coloration.
Built from the ground up with a fully symmetrical, fully-balanced circuit design, the H400 MK2 eliminates common-mode noise and interference at every stage of signal processing. From input to output, the balanced topology maintains signal integrity and delivers a blacker background and wider soundstage compared to single-ended designs.
Operating in Class A mode, the H400 MK2 ensures that the amplifying devices remain active throughout the entire audio cycle. This eliminates crossover distortion entirely, resulting in a smooth, natural, and highly musical presentation that is especially well-suited for critical listening and high-resolution audio.
The H400 MK2 is equipped with balanced XLR and 4.4mm Pentaconn outputs alongside a standard 6.35mm single-ended output, ensuring compatibility with a wide range of headphones — from entry-level to flagship models. Dual gain modes allow precise matching with both sensitive IEMs and demanding full-sized headphones.
Housed in a solid aluminum alloy chassis with a clean, minimalist aesthetic, the H400 MK2 is built to the same exacting standards as professional studio equipment. Its sturdy construction provides effective shielding against electromagnetic interference while dissipating heat efficiently for long listening sessions.
Every component in the H400 MK2 is selected for its acoustic contribution. The result is an amplifier that disappears from the signal chain — revealing the full character of your headphones and the finest details in your recordings. Whether you're driving a Sennheiser HD 800S, an Audeze LCD-4, or any other demanding transducer, the H400 MK2 rises to the challenge.
A new tariff system will take effect across all 27 EU member states starting 1 July 2026. The EU is abolishing the duty exemption for low-value parcels — all goods entering the EU will now be subject to customs duties, including a fixed duty of €3 per HS tariff code category for IOSS-declared goods under €150.
A handling surcharge of USD $5 has been applied to all standard shipments to EU countries on orders under $100. Orders over 100 qualify for free expedited shipping.
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In the event that a shipment is refused, undeliverable, or returned to sender, HiFiCat will process a refund to the original payment method. If a customer requests reshipment, a reshipment fee will apply. A restocking fee of up to 20% may also apply.
All taxes and duties are prepaid (DDP). 5–10 working days. Free standard shipping.
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Austria, Belgium, Bulgaria, Croatia, Czech Republic, Denmark, Estonia, Finland, Greece, Hungary, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Cyprus
All taxes and duties are prepaid (DDP). 10–15 working days.
💰 Shipping cost: $5.00 USD (orders $0–$100) | Free (orders $500+, via DHL Express)
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Norway, Switzerland, Ukraine, Armenia, North Macedonia, Moldova, Monaco, San Marino, Vatican City, Serbia, Albania, Kosovo, Montenegro, Bosnia & Herzegovina, Belarus, Georgia, Andorra, Guernsey, Jersey, Faroe Islands, Svalbard & Jan Mayen, Guadeloupe, Réunion, Gibraltar, Isle of Man, Mayotte, Iceland, Liechtenstein, Turkey
All taxes and duties are prepaid (DDP). 10–15 working days. Free standard shipping.
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