SMSL AL400 Integrated Amplifier 2.1
€ 299,00 Incl. Vat
✅ 2 years standard warranty
✅ Free return within 14 days
✅ Orders before 17:00 → shipped today
❌ Out of stock
SMSL AL400: Cirrus Logic DAC and XMOS interface
The DAC section of the AL400 is based on a Cirrus Logic CS43131 chip combined with an XMOS XU-316 USB processor. This combination supports files up to 32bit 768kHz PCM and DSD256. In addition, the AL400 also features full MQA and MQA-CD decoding, allowing you to enjoy your music regardless of format.
SMSL AL400: 2x165W amplification
The AL400 incorporates a TPA3255 Class D amplifier chip, delivering 2x165W under 4Ω while maintaining a THD+N of 0.03%. Volume control is based on a Japanese-made ROHM BD37524FS-E circuit, an electronic process that ensures precise adjustment across the entire dynamic range without any measurable signal degradation. This solution limits the introduction of noise and distortion, even at low listening levels, unlike conventional mechanical potentiometers, which can cause channel imbalance and gradual deterioration.
SMSL AL400: Dedicated subwoofer output
A dedicated subwoofer output allows for a 2.1 configuration with independent volume control from the main level. The AL400 offers four selectable low-pass cutoff frequencies (55Hz, 85Hz, 120Hz, 160Hz), allowing you to adjust the crossover point between the main speakers and the subwoofer according to their respective bass extension. A phase inverter offers a choice between 0° and 180°, a correction that is sometimes necessary to align the subwoofer's output with that of the speakers, particularly when their spatial positioning generates unwanted cancellations or reinforcements in the lower end of the spectrum.
SMSL AL400: A full range of connectors
The AL400's connectivity covers all common digital and analogue sources. The HDMI eARC input allows volume control and automatic power-up via CEC protocol, the USB input uses the XMOS XU-316 processor to handle 32-bit/768kHz and DSD256 streams, and coaxial and optical inputs complete the digital options.
On the analogue side, a built-in phono preamplifier allows direct connection of a turntable equipped with MM (Moving Magnet) or MC (Moving Coil) cartridges, eliminating the need for an external preamplifier. An RCA line input handles other analogue sources.
Finally, the Bluetooth section supports LDAC, aptX Adaptive, aptX HD, AAC and SBC codecs, ensuring high-quality sound reproduction even when connected wirelessly.
SMSL AL400: Multi-band equaliser
The AL400 features a multi-band equaliser that allows independent adjustment of treble, midrange and bass frequencies. Each frequency band has a gain control for targeted amplification or attenuation, as well as a Q control that defines the bandwidth affected by the correction. This module thus offers you acoustic correction that can be adapted to the characteristics of the listening room or the specific response of the speakers used, without the need for external equipment or additional software processing.
| Specifications | |
|---|---|
| Product type | Integrated amplifier DAC |
| Amplification type | Class D |
| Inputs | 1x Stereo RCA 1x USB-C 1x Coaxial 1x Optical Toslink 1x Phono 1x HDMI eARC Bluetooth |
| Outputs | Speaker terminals 1x Subwoofer |
| Total harmonic distortion more noise (THD+N) | 0.003% |
| Signal-to-noise ratio (SNR) | 101dB |
| Channel separation | 100dB |
| Input sensitivity / Input impedance | 560mV / 22kΩ |
| RMS output power | 2x165W @ 4Ω 2x85W @ 8Ω |
| USB transmission | Asynchronous |
| USB compatibility | Windows 7/8/8.1/9/10/11 Mac OSx Linux |
| MQA decoder | USB Coaxial OpticalToslink |
| MQA-CD decoder | Coaxial Optical Toslink |
| Supported sampling rates | USB : PCM up to 32bit 768kHz, native DSD up to DSD256 Coaxial / Optical : PCM up to 24bit 192kHz, DSD64 (DoP) |
| General | |
|---|---|
| Power supply voltage | 100-240V AC |
| Consumption | 40W |
| Dimensions | 254 x 45 x 210mm |
| Weight | 1.7kg |
| Color | Silver |
| Package | 1x SMSL AL400 1x Remote control 1x USB-A to USB-C cable 1x HDMI cable 1x Power cable |
Shipping - Made easy with DPD, DHL and your National shipping company
We deliver your Hifimastery order as quickly as possible via DPD, DHL, or PostNL (your country’s national postal service). You choose your preferred carrier at checkout. All shipments are insured and tracked, so we handle any loss or damage.
Shipping Costs:
- Netherlands & Belgium: Free shipping on orders over €50;
- Other European countries: Free shipping on orders over €100–€200 (depending on country, always visible in checkout before payment).
The higher the order amount the lower the shipping costs until the free shipping amount is reached, which is fair...
Order Shipping Times:
- Orders placed before 17:00h and in stock ship the same day monday-friday;
- In case a product has a longer delivery time than this is mentioned at the stock status!!!
You choose we follow:
You can choose in the checkout what shipping company you want us to use for shipping your order. Sometimes due to longer delivery times etc, we can choose another reliable partner based on your order.
Track & Trace
We know you’re eager to enjoy your order—and we completely understand! Once your order has been shipped via an external carrier, you’ll receive an email from us containing a tracking number or a direct link to the carrier’s tracking page. This lets you see exactly when your order is expected to arrive.
If your order is delivered to a pickup point due to your absence, you’ll be notified either through the tracking information or via services provided by the carrier.
Returns & Right of withdrawal – We keep it simple
Not satisfied with your purchase? No worries! Returning items is simple and stress-free.
✨ Key Highlights:
- No reason needed – return “just because”
- 14-day reflection period – from delivery date and within 14 days later you can decide to keep it or not...
- Fast inspection – returns inspected within a few days most of time 5 days (max 14);
- refund will be done mostly same day after inspection is done.
Return Conditions:
Items are undamaged and clean.
- All accessories included (also manual etc);
- Original packaging;
- Pack items securely for safe return;
- Sealed products remain unopened (applies to fragile or hygiene-sensitive items, e.g., turntable styli, in-ear earbuds).
For furniture, always choose Option 2.
Option 1 – Return Label:
- Use our return portal to print a return DPD shippinglabel;
- Coverage is up to €500 via DPD (other carriers not insured);
- Returns are at the customer’s risk and expense (if you need more insurance value contact us so we can check for higher insurance or choose option 2)
Option 2 – Own Carrier:
- Arrange return with a carrier of your choice;
- Email us: “Return: order number …” to receive a return form to include in your package;
- Return requested more than 2 weeks after delivery day cannot be processed and declined.
Timeframe:
- You have 14 days to request a return calculated from the day the package was delivered to you;
- The package must be received in our warehouse within 2 weeks after your request to return the product.
Exchange product:
- Place a new order for the desired product;
- Original order must be returned and will be refunded (minus any return costs);
- Refunds processed via the original payment method within 2 weeks.

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