SMSL
SMSL AL400 All-in-one power amplifier
SMSL AL400 All-in-one power amplifier
Couldn't load pickup availability
Low stock: 2 left
SMSL AL400 All-in-One Power Amplifier
Unify your entire home entertainment. A reference-grade 165W power amplifier combining flagship digital conversion, MM/MC phono stage, active subwoofer routing, and TV eARC integration.
Six Core Pillars of Sound
TPA3255 High-Power Core
Delivers up to 165W x 2 @ 4Ω with exceptional energy efficiency and dynamic acoustic grip.
HDMI eARC with CEC
Synchronizes power and volume control directly with your television's remote for seamless usage.
Built-In MM/MC Phono
Features an ultra-low-noise phono pre-amp stage, adapting to MM and MC turntable cartridges.
CS43131 Flagship DAC
Equipped with Cirrus Logic's high-resolution DAC chip for pristine digital-to-analog translation.
Bespoke Equalization
3-band tone control allows precise frequency adjustment to match your listening space.
Structural CNC Panel
Precisely milled aluminum alloy faceplate with premium anodization for structural isolation.
Effortless Power meets Refined Control
The heartbeat of a modern audiophile living space. The SMSL AL400 integrated amplifier utilizes Texas Instruments' high-efficiency TPA3255 power core, producing a massive 165W per channel into 4 ohms. Operating alongside Japan ROHM's BD37524FS-E electronic volume module, the amplifier controls speaker outputs with precision, avoiding channel mismatch while keeping THD+N down to an exceptional 0.003%.
Flagship digital processing & high-res decoding
Enjoy uncompromised resolution across your digital platforms. Powered by Cirrus Logic's high-resolution CS43131 DAC chip and a third-generation XMOS XU-316 processor, the AL400 decodes high-resolution PCM up to 32-bit/768kHz, DSD256, and full MQA-CD unfolding. High-quality gold-plated terminals protect analog coupling, while Qualcomm's reference-class Bluetooth receiver supports aptX HD, AAC, and lossless LDAC streaming.
Analog Turntable Sanctuary & Custom Tone Curves
Celebrate the physical beauty of vinyl. A built-in, low-noise phono equalizer amp accommodates both Moving Magnet (MM) and Moving Coil (MC) turntable cartridges. The front-panel control interface lets you calibrate three-band tone settings, adjusting individual treble, mid, and bass frequencies, while low-volume dynamics can be compensated using the built-in "Loudness" contour.
All-in-One Home Integration Matrix
The SMSL AL400 functions as an versatile system hub, integrating home media, analog vinyl, and multi-channel speaker systems smoothly:
Connect to your smart TV via HDMI eARC. The amplifier syncs seamlessly with your TV remote, turning on/off and managing volume dynamically via CEC protocol.
Connect MM or MC vinyl players directly to the dedicated phono inputs. High-precision low-noise pre-amplification restores the raw warmth and density of vinyl recordings.
Connect an active subwoofer via the dedicated sub-out port. Adjust LPF crossover frequency (55Hz-160Hz) and phase (0°/180°) in the menu to integrate sub-bass with your main monitors.
Frequently Asked Questions
Can I control the amplifier volume using my regular TV remote? +
Yes, absolutely. By connecting your TV's HDMI eARC/ARC port to the AL400's HDMI port and enabling the CEC option in the menu, the amplifier will automatically synchronize with your TV's power and volume commands.
How do I configure the subwoofer low-pass filter? +
Under the SUBWOOFER submenu, you can select four low-pass filter cutoff frequencies (55Hz, 85Hz, 120Hz, or 160Hz) and toggle the acoustic phase between 0° and 180° to ensure seamless low-frequency hand-off to your active subwoofer.
Does the phono stage support both MM and MC cartridges? +
Yes, it does. The built-in high-precision, low-noise phono pre-amplifier stage features a selectable MM/MC setting in the PHONO SELECT menu, matching the signal impedance requirements of both cartridge designs.
How powerful is the built-in speaker amplifier? +
Driven by the TI TPA3255 class-D chip, the AL400 outputs up to 165W x 2 into 4-ohm loads and 85W x 2 into 8-ohm loads, providing ample current headroom to drive passive bookshelf and floorstanding speakers.
What is the "Loudness" setting on this amplifier? +
The LOUDNESS menu provides low-level compensation curves. Since the human ear naturally loses sensitivity to deep bass and high treble frequencies at low volumes, turning LOUDNESS on boosts these frequencies dynamically to maintain a balanced frequency spectrum.
SMSL AL400 Specifications
| Parameter | Details |
|---|---|
| Inputs | RCA / Bluetooth / USB / Optical / Coaxial / Phono (MM/MC) / HDMI(eARC) |
| Outputs | Stereo Binding Posts (Speaker Out) / Active Subwoofer Pre-out |
| THD+N | 0.003% |
| Signal-to-Noise Ratio (SNR) | 101dB |
| Channel Separation | 100dB |
| Output Power (Stereo RMS) | 4Ω: 165W x 2 8Ω: 85W x 2 |
| Input Sensitivity / Impedance | 560mV / 22kΩ |
| USB Sampling Rates | PCM: 44.1 ~ 768kHz (16~32bit) DSD: 2.8224 ~ 11.2896MHz (DSD256, DoP/Native) |
| Optical / Coaxial Sampling Rates | PCM: 44.1 ~ 192kHz (16~24bit) DSD: DSD64 (DoP) |
| MQA / MQA-CD Decoder Input | USB / Optical / Coaxial |
| Bluetooth Specifications | v5.4 (Supports LDAC, aptX, aptX HD, SBC, AAC) |
| Power Consumption | 40W (At standard listening volume) |
| Dimensions & Weight | 254 x 44.99 x 210.4 mm (WxHxD) | 1.7kg (3.75lbs) |
In the Box
Every SMSL AL400 package includes a comprehensive set of accessories, allowing you to connect and synchronize your system components immediately:
- SMSL AL400 All-in-one Power Amplifier
- Full-Function Remote Control (RC-8A)
- AC Power Supply Cable (Matched to destination country)
- USB-A to USB-B Cable
- Bluetooth External Antenna
- User Manual / Guide
Important Note on Noise Floor: At absolute maximum volume with no input signal connected, a faint background hiss may be slightly audible in exceptionally quiet environments. Since normal, safe listening levels are significantly lower, the background remains dead-silent during regular, daily use.
