SMSL SP400 Balanced Headphone Amplifier THX AAA-888 [b-Stock]



B-Stock product, (read below) in excellent condition with original packaging, 2 year warranty.

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344,26 €

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SMSL SP400 Balanced Headphone Amplifier THX AAA-888 MQA

THXAAA-888 Headphone Amplifier with THX AAA Technology;

Ultra-Compact Design, Perfect for Desktop Systems;

Balanced Stereo Headphone Output ;

Pre-amplifier application ;

Balanced Stereo Line Input;

High Precision Resistors for Temperature Stability ;

Pop-less Design with High-Quality Relays;

High precision and low noise 256 level relay volume control;

*In actual use, in order to make the volume more linear, the extra levels are shielded.

12 Watts into 16 Ohm, 6 Watts into 32 Ohm ;

0.1 Hz to 500 kHz(-3dB) Frequency Response ;

3 Positions Switchable Gain Control ;

Fully Protection with DC, Over-Voltage, Over-Current, Short-Circuit and

Thermal Protection on Headphone Amplifier ;

High-Efficiency Ultra-Low-Noise Power Supply .

1.9 inch LCD display.

Fully Balanced THX888 design

SP400 not only features THX888, but also uses many 0.1% high-precision low temperature drift resistors and components in the design. The PCB uses 6-layer immersion gold circuit board, and dual customised power modules provide stable and reliable power output guarantee. All the cost is only to achieve the desired HIFI sound quality, lower distortion, and listen to the true and natural expression. SP400 is not only first-class parameters, the sound goes to the next level!
THX has patented feedforward error correction technology, lower sound colour and low distortion, which makes the listening experience real and natural.

CNC Precision Machining Aluminium Housing

By using anodising technology and the chamfering process, the unit has a high-end appearance which is exquisite and durable.

THX888 circuit design

THX patented audio amplifier circuit (THX AAAtm) 888 is linear double amplifier circuit with feedforward error correction technology. Eliminates the distortion mechanism of traditional amplifier circuits, reduces harmonics, intermodulation and crossover distortion. The headphone output jack is made in Japan and the preamp output is fully balanced. The volume control is a high precision 256 level relay. Using two pieces of customised 24W high-efficiency low noise power supply guarantees excellent audio performance and output efficiency.

Technical characteristics

Product typeBalanced headphone amplifier
Amplification chipTHX AAA-888
Înputs1x Single-ended stereo RCA
1x Balanced stereo XLR
Outputs1x Jack 6.35mm single-ended headphone output
1x XLR 4 poles balanced headphone output
1x XLR Balanced output (Pre-Out)
Power outputBalanced : 2x 12W @ 16Ω, 2x 6W @ 32Ω, 2x 880mW @ 300Ω, 2x 440mw @ 600Ω
Single-ended : 2x 6W @ 16Ω, 2x 3W @ 32Ω, 2x 440mW @ 300Ω, 2x 220mW @ 600Ω
SNR133dB (A-Weighted)
Output noise1.9µV (A-Weighted)
THD+N-123dB, 0.00007% (1kHz, 32Ω)
-117dB, 0.00013% (20Hz - 20kHz, 32Ω, -3dB)
THD< -125dB, 0.00006%
Input impedance47kΩ
Output impedanceApprox. 0Ω
Frequency response0.1Hz - 500kHz (-3dB)
Power supplyAC100-240V, 50-60Hz
Consumption< 40W
Standby consumption< 0.1W
Dimensions225 x 210 x 43mm
Package1x SMSL SP400
1x Remote control
1x Power cable

Introduction to SMSL Audio

SMSL Audio is a company specializing in audio DACs, headphone amplifiers, power amplifiers, digital interfaces and high fidelity players, with its own research, production and marketing team.

The brand has its own R&D center that designs high quality HiFi products that meet all needs. The reliability of their devices has allowed the brand to gain popularity and recognition in the audiophile world.

A bit of history...

SMSL Audio established in Shenzen, China in 2009. In 2014 SMSL started to use ESS DAC chips to design and manufacture Hi-Fi Audio DACs. In 2015 SMSL created the widely acclaimed "Panda Set". In 2016 we launched a new series of power amplifiers with Danish ICE-Power technology. And in 2017 the company expanded its sales channels outside China. In 2018 the flagship SMSL DAC D1 is launched. In 2019 we launched the first MQA DAC, model M500. In 2020, on the SMSL's 10th Anniversary, we started the production of our first two-way passive hi-fi speaker. To be continued...


A ´B-Stock´ is a product which has been returned by a customer within their 14/30 Day Money Back Guarantee.
These items are offered at a special, reduced price. Please note, that occasionally the packaging is no longer in pristine condition.
B-Stock products are in full working order and are checked by specialists before releasing them as B-Stock. They come with the full 2 year warranty as any other new product.
Any special comments about a B-Stock product will be noted at the beginning of the article description.

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SMSL SP400 Balanced Headphone Amplifier THX AAA-888 [b-Stock]

B-Stock product, (read below) in excellent condition with original packaging, 2 year warranty.

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