S.M.S.L AL400 Bluetooth Amplifier TPA3255 & CS43131 DAC Hi-Fi Class D Audio Amplifier 2.1/2.0ch HDMI(eARC), PHONO, USB, Optical, Coaxi

**Product Specifications:**

**Output (RMS):** 165W+165W (4Ω), 85W+85W (8Ω) **THD+N:** 0.003% **S/N Ratio:** 101dB **Channel Separation:** 100dB **Input Sensitivity:** 560mV **Input Impedance:** 22kΩ **Digital Amplifier IC:** TPA3255 **USB Transmission Method:** Asynchronous Transmission **Supported OS (USB Connection):** Windows 7/8/8.1/10/Mac OSX 10.6 or later/Linux/Android (OTG)/iOS (Apple Lightning-USB Camera Kit) **MQA Decoder:** USB/Optical/Coaxial **MQA-CD Decoder:** Optical/Coaxial **Bits:** USB: 16bit/24bit/32bit/1bit, Optical/Coaxial: 16bit/24bit/1bit **Sampling Rate:** USB: PCM 44.1~768kHz, DSD64, DSD128, DSD256 Optical/Coaxial: 44.1kHz/48kHz/88.2kHz/96kHz/176.4kHz/192kHz/DSD64 (DoP) **Input Terminals:** USB, Optical, Coaxial, Bluetooth, Stereo RCA (Gold-Plated), HDMI (eARC), PHONO **Output Terminals:** 2ch Stereo Speaker Output (Banana Plug Compatible Gold-Plated Terminals), Subwoofer Signal Output Terminal **Power Consumption:** 40W (at normal volume) **Dimensions:** Height 44.99mm x Width 254mm x Depth 210.4mm

**Accessories:** 1x Simplified Instruction Manual (Chinese, English, Japanese) 1x Remote Control 1x Bluetooth Antenna 1x Power Cable 1x USB A-USB C Cable 1x HDMI Cable

**Note:** Official drivers can be downloaded from the S.M.S.L official website. Please refer to this address for file location: SUPPORT - Product-driver Download - AL400

■ **High Output & High-Quality Digital Amplifier:** Equipped with a high-output digital amplifier chip "TPA3255" from Texas Instruments. It achieves excellent sound quality with high efficiency and low power consumption. An electronic volume control IC "BD37524FS-E" from ROHM is adopted for volume adjustment, achieving precise control and ultra-low distortion.

■ **Professional-Grade Tuning Functions:** Detailed adjustments are possible for the high, mid, and low bands, including frequency point, gain, and Q value. This enables precise frequency characteristic correction according to speakers and listening environment. Furthermore, when constructing a 2.1ch system, it features a subwoofer volume adjustment, four-stage low-pass cutoff frequency switching, and phase (0°/180°) switching, enabling optimal collaboration with the main speakers.

■ **High-Resolution Compatible High-Performance Audio DAC:** Equipped with a high-performance DAC chip "CS43131" from Cirrus Logic and the latest 3rd generation XMOS program "XMOS XU316", the AL400 supports up to PCM 768kHz/32bit and DSD256 native playback, and full MQA decoding. Optical and coaxial inputs support MQA-CD.

■ **Wide Range of Compatible Devices Due to Diverse Inputs:** Built-in latest Bluetooth supporting LDAC, aptX HD, AAC, and SBC. It also features an HDMI (eARC) input, enabling high-quality playback of TV audio. In addition, it has a low-noise phono equalizer compatible with MM/MC cartridges, allowing direct connection to analog record players!

■ **Lyrics Display Support:** When using Bluetooth input, information such as lyrics, artist, and song title is displayed, making it easy to see information about your favorite songs! (Depending on the device model and playback software, this function may not be displayed correctly on some devices.)

■ **High-Quality Construction:** The aluminum panel, CNC-machined and anodized, achieves sophisticated shaping and excellent texture. The operation system is equipped with an easy-to-understand UI and a full-function remote control. Numerous audio-grade components emphasizing sound quality are adopted internally, incorporating high-quality plated terminals, overheat/overcurrent protection circuits, and a dedicated switching power supply for high-power audio, ensuring high durability and stable, high-performance operation.

【Voltage Compatibility】 When using electrical appliances, please note that they are designed for Japanese voltage specifications (90-110V), so if you use them with a different voltage, it may cause a malfunction.

【Plug Type】 Our products use Japanese plug types (A or B type). Please use a conversion adapter if necessary.

【Important Note on Transformers and Adapters】 A transformer adjusts voltage to match your device's requirements. A conversion adapter only changes the plug shape and does not adjust voltage. Using only a conversion adapter without a transformer may result in damage to the product.

【Liability】 We are not responsible for malfunctions or damages caused by improper use, such as operating the product without a transformer.