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Headphone amplifier

An evolution of the H300, the SMSL H400 is a compact headphone amplifier / preamplifier now featuring a handsome IPS display behind tempered glass, a grounding post and a Grounded/Floated switch. It is powerful too, delivering up to 15 W into 16 ohms and 7.5 W into 32 ohms.

• Fully balanced, discrete design for very high output power
• Distortion as low as 0.00006% and a signal-to-noise ratio of 133 dB
• Up to 15 W into 16 ohms and 7.5 W into 32 ohms
• Relay-switched volume attenuator with no left/right channel imbalance
• 3-step gain, with low gain optimised for IEMs
• Preamp output: can be used as a high-end preamplifier
• IPS display with optically bonded tempered glass
• Ultra-compact format, ideal for a desktop system
• High-precision, low thermal drift resistors
• High-quality relays with no switching noise
• Frequency response from 20 Hz to 100 kHz (-0.5 dB)
• Full protection: DC, overvoltage and overload
• High-efficiency, low-noise built-in power supply
• Remote control included

Specifications

• Inputs: balanced and unbalanced
• Balanced output power: 2 x 15 W
• Signal-to-noise ratio: 133 dB
• Dynamic range: 133 dB
• THD+N: -123 dB
• Input impedance: 47 kΩ
• Line output impedance: 44 Ω balanced; 22 Ω unbalanced
• Frequency response: 20 Hz to 100 kHz
• Balanced gain: Low (-5.8 dB), Medium (6 dB), High (20.4 dB)
• Unbalanced gain: Low (-11.8 dB), Medium (0 dB), High (14.4 dB)
• Standby consumption: less than 0.5 W