SMSL
SMSL SP400 THX Headphone Amplifier - Open Box - Clearance
SMSL SP400 THX Headphone Amplifier - Open Box - Clearance
SMSL SP400 THX Headphone Amplifier - Open Box - Clearance
Description
SMSL SP400 THX AAA Headphone Amplifier
The SMSL SP400 takes everything that made the SP200 a benchmark desktop amplifier and refines it with modern usability and system flexibility. Retaining the acclaimed THX AAA-888 amplifier topology, the SP400 delivers massive power, vanishingly low distortion, and an exceptionally quiet background, now paired with a display, remote control, and balanced preamp output.
A Classic Design, Thoughtfully Updated
The core of the SP400 remains the THX AAA-888 amplifier circuit, known for its feed-forward error correction that actively removes distortion before it reaches your headphones. What has changed is the experience. A bright 1.9 inch LCD display provides clear visual feedback, a full-function remote adds convenience, and the chassis matches the SMSL M400 DAC for clean stacking and a unified desktop system.
Power for Virtually Any Headphone
With up to 12 watts into 16 ohms and 6 watts into 32 ohms from the balanced output, the SP400 has the headroom to drive nearly any dynamic or planar magnetic headphone. A three-position gain switch allows fine tuning for sensitive IEMs or demanding full-size headphones, adding up to six decibels of extra output when needed.
THX AAA-888 Clarity
The THX AAA-888 design uses a feed-forward error correction architecture that measures distortion early in the signal path and corrects it downstream. The result is an amplifier that delivers extreme transparency, speed, and control without adding coloration or grain.
Pitch-Black Background
With a signal-to-noise ratio of 133dB and output noise of just 1.9 microvolts, the SP400 remains silent even with highly sensitive headphones. Music emerges from a black background with no hiss, hum, or unwanted artifacts.
Desktop Friendly Form Factor
Despite its output capability, the SP400 maintains a compact footprint that fits easily on most desks. Designed to stack seamlessly with the SMSL M400 DAC, the combination creates a powerful yet space-efficient desktop reference system.
Product Highlights
- THX AAA-888 headphone amplifier technology
- Balanced and unbalanced headphone outputs
- Balanced and unbalanced line inputs
- Balanced preamp output
- Ultra-low distortion and noise performance
- Three-position switchable gain control
- 256-level relay-based volume control
- Pop-less design with high-quality relays
- 1.9 inch LCD display
- Full-function remote control
- Comprehensive protection circuitry
Technical Specifications
| Inputs | 1 balanced, 1 unbalanced |
| Headphone Outputs | 1 balanced, 1 unbalanced |
| Preamp Output | Balanced |
| Balanced Output Power | 12W x2 @16Ω, 6W x2 @32Ω, 880mW x2 @300Ω, 440mW x2 @600Ω |
| Unbalanced Output Power | 6W x2 @16Ω, 3W x2 @32Ω, 440mW x2 @300Ω, 220mW x2 @600Ω |
| SNR | 133dB A-weighted |
| Output Noise | 1.9μV A-weighted |
| THD+N | 0.00007% @1kHz, 32Ω |
| Frequency Response | 0.1Hz to 500kHz (-3dB) |
| Input Impedance | 47kΩ |
| Output Impedance | Near 0Ω |
| Power Supply | AC 100 to 240V, 50 to 60Hz |
| Power Consumption | <40W, <0.1W standby |
| Dimensions | 220 x 215 x 43 mm |
| Weight | 1330 g |
What’s in the Box
- SMSL SP400 headphone amplifier
- Remote control
- Power supply cord
- User manual
FAQ
What headphones pair well with the SP400?
The SP400 can drive nearly all dynamic and planar magnetic headphones, from sensitive low-impedance models to high-impedance designs up to 600 ohms.
Can the SP400 be used as a preamp?
Yes. The balanced preamp output allows the SP400 to function as a high-quality preamplifier for powered speakers or power amplifiers.
Does it include a remote?
Yes. A full-function remote is included for volume control and operation from a distance.
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