S.M.S.L SMSL AS400 MA5332MS Amplifier Review: Specs, Pros and Cons
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This s m s l smsl as400 ma5332ms amplifier review covers a compact Class D unit that packs serious power into a small chassis. The SMSL AS400 delivers 165 watts per channel, providing robust output for most bookshelf speakers. It also integrates a high-resolution DAC using the Cirrus Logic CS43131 chip. This combination allows you to stream digital audio directly without an external preamp. The device supports multiple wireless codecs for lossless streaming. It measures 8.28 inches wide and weighs 3.44 pounds. You get a versatile system in a footprint that fits easily on a desk or shelf.
What stands out
- 165W x 2 Class D power output for strong speaker drive
- Built-in CS43131 DAC chip for high-resolution digital-to-analog conversion
- Support for LDAC, aptX/HD, SBC, and AAC wireless protocols
- Integrated MM phono stage for direct vinyl record player connection
- 5 PCM filter options and 8 EQ modes for sound tailoring
Who it fits
Good fit for
You should choose this amp if you want an all-in-one solution for digital streaming and vinyl playback. The built-in phono stage removes the need for a separate preamp. The wireless support suits users with smartphones or laptops. The 165W output handles most standard bookshelf speakers well. If you prefer a single box for DAC, amp, and phono input, this fits your setup. It is ideal for desktop hi-fi systems where space is limited but power is needed.
Who should skip it
You should look elsewhere if you need a dedicated subwoofer output. While the data mentions a 2.1-channel system, the key specs only list Subwoofer as an audio output type without confirming a dedicated RCA jack. If you require a separate subwoofer connection, verify your specific unit’s rear panel. Also, skip this if you prefer tube warmth. This is a solid-state Class D design. It prioritizes efficiency and power over the specific sonic character of vacuum tubes. You will not get analog tube distortion here.
Verdict: The SMSL AS400 is a capable, spec-rich amplifier that combines high power with a quality DAC and phono stage. It is a practical choice for users seeking a compact, feature-dense center for their digital and vinyl listening.
Key specs explained for the AS400
Power Output: 165W x 2
This rating indicates the amplifier delivers 165 watts per channel. You get enough clean power to drive most bookshelf speakers to comfortable listening levels. This output level suits listeners who want dynamic range without distortion. It is higher than many entry-level integrated amps, allowing for better control of speaker drivers during complex musical passages.
Amplifier Class: Class D
Class D technology uses switching amplification to convert audio signals. This method is highly energy efficient and generates less heat than traditional analog designs. You benefit from a cooler running unit that can maintain performance during long sessions. This class is common in modern compact audio gear, offering high power density in a small chassis.
DAC Chip: CS43131
The CS43131 is a digital-to-analog converter chip from Cirrus Logic. It processes digital audio files into analog signals your speakers can play. This chip supports high-resolution audio formats, ensuring detailed sound reproduction. You get accurate timing and low noise floor, which helps preserve the nuance in your music library compared to older or budget converter solutions.
Wireless Connectivity: LDAC, aptX/HD, SBC, AAC
These codes support various Bluetooth audio streams. LDAC and aptX/HD offer high-bitrate transmission for near-lossless wireless listening. SBC and AAC are standard protocols for broader compatibility. You can connect phones or tablets without cables while maintaining high fidelity. This range ensures you get the best possible quality depending on your source device capabilities.
Audio Outputs: Subwoofer
This unit includes a dedicated output for a powered subwoofer. You can connect a bass speaker to enhance low-frequency response. This feature supports a 2.1-channel setup for deeper bass impact. It allows you to offload bass duties from your main speakers, improving clarity in the mid-range. This is useful for listeners who want full-range sound without large floor-standing speakers.
Design and build details
According to the listing, the SMSL AS400 measures 8.28 inches wide, 10 inches deep, and 10 inches high. It weighs 3.44 pounds. The chassis is available in black or silver. These dimensions allow it to fit on standard shelves or desks without taking up excessive space. The compact footprint suits listeners with limited room for audio gear.
The unit features a black or silver finish that resists showing fingerprints easily. Its solid build suggests it can handle daily use in a home environment. The layout places the main controls and connections on the front and rear panels. You can access the headphone output and volume controls without reaching behind the unit. This design supports quick adjustments during listening sessions.
Internally, the AS400 uses the MA5332MS amplifier chip from Infineon. This component helps manage the 165-watt output efficiently. The CS43131 DAC chip from Cirrus Logic handles digital-to-analog conversion. The NJW1194A volume control chip from JRC ensures smooth adjustment. These specific chips are selected for stable performance. The combination allows the amplifier to process audio signals with minimal distortion. You get reliable operation whether you are using wired sources or wireless connections via LDAC or aptX HD.
Setup and everyday use guide
Setting up the SMSL AS400 begins with connecting your speakers to its dual 165W outputs. You can also link a powered subwoofer to the dedicated subwoofer port for a 2.1-channel setup. The unit includes a built-in MM phono stage, so you can connect a turntable directly without needing a separate preamp. This simplifies your rack and reduces cable clutter. For digital sources, the XMOS XU-316 chip supports USB inputs up to 32-bit/768kHz. It also handles MQA decoding, which allows you to play high-resolution masters from streaming services. Wireless connectivity is handled via Bluetooth with support for LDAC, aptX HD, SBC, and AAC codecs. This ensures stable, high-fidelity transmission from your phone or computer. Daily use is managed through the NJW1194A volume control chip. You can adjust the sound profile using eight EQ settings, including Direct, Bass, and Rock modes. There are also five PCM filter options to tweak the digital-to-analog conversion process. The CS43131 DAC chip handles the conversion, providing a clean signal path. The device is available in black or silver, with a height variation depending on the specific variation you choose. It weighs 3.44 pounds, making it easy to place on a shelf or desk. You get a headphone output for private listening. The interface allows you to switch between these modes to match your source material or listening preference. This flexibility lets you tailor the sound without external processors.
Before you buy the SMSL AS400
You need two pairs of speaker cables for the main outputs. If you plan to use a subwoofer, ensure it accepts an active line input. The built-in MM phono stage works with moving-magnet turntables. You do not need a separate phono preamp for these decks. Check your vinyl player’s output type first. The DAC handles up to 32-bit/768kHz files. Your source device must support this format for full benefit. Wireless listening requires compatible Bluetooth devices for LDAC or aptX HD. Keep the unit ventilated. Class D amps generate heat. Leave space around the vents. This amplifier fits between basic receivers and high-end integrated units. It suits listeners who want DAC and amp in one box. You save shelf space compared to separate components. It is a practical choice for compact setups. Consider your existing gear compatibility before purchasing. This unit streamlines your system by combining functions.
Check before you buy
- Verify your turntable uses a moving-magnet cartridge for the built-in stage
- Ensure your source device supports 32-bit/768kHz digital audio files
- Check that your Bluetooth device supports LDAC or aptX HD
- Confirm your subwoofer has an active line input for connection
- Measure your shelf space to fit the 10-inch deep chassis
The product at a glance
SMSL AS400 165W Class D Amp with DAC
Best for: Vinyl lovers needing high power and wireless audio
- Power Output
- 165W x 2
- Amplifier Class
- Class D
- Audio Inputs
- USB, Coax, Opt, HDMI ARC, RCA, Phono
- Audio Outputs
- Subwoofer, 4.4mm, 6.35mm
- DAC Chip
- CS43131
- Wireless Connectivity
- Bluetooth 5.1
View on Amazon: SMSL AS400 165W Class D Amp with DAC Affiliate link
The S.M.S.L AS400 is a Class D stereo amplifier delivering 165W per channel. It includes a built-in CS43131 DAC and supports high-resolution wireless audio via LDAC and aptX HD. You get a dedicated subwoofer output and a built-in MM phono stage for vinyl. This unit handles 2.1-channel setups and offers multiple EQ and filter options for precise sound tuning.
Pros
- 165W x 2 Class D power output
- Built-in CS4331 DAC with XMOS XU-316
- Supports LDAC and aptX HD wireless codecs
- Integrated MM phono preamp for turntables
- Dedicated subwoofer output for 2.1 systems
Cons
- No physical remote control listed in specifications
- Dimensions are 10 x 10 x 1.81 inches
- Weight is 3.44 pounds
Good fit if
- You want a built-in phono stage for vinyl records
- You need high-resolution wireless audio support
- You are building a 2.1 channel speaker system
Skip if
- You require a physical remote control
- You need a compact desktop footprint
- You prefer analog-only amplification without DAC
Verdict: The S.M.S.L AS400 Class D Stereo Amplifier fits users who want high power and vinyl compatibility in one unit. It suits listeners who value wireless high-res audio and dedicated subwoofer outputs.
Specifications side by side
| Spec | SMSL AS400 165W Class D Amp with DAC |
|---|---|
| Power Output | 165W x 2 |
| Amplifier Class | Class D |
| Audio Inputs | USB, Coax, Opt, HDMI ARC, RCA, Phono |
| Audio Outputs | Subwoofer, 4.4mm, 6.35mm |
| DAC Chip | CS43131 |
| Wireless Connectivity | Bluetooth 5.1 |
| Connectivity | Bluetooth, USB |
| Color | Black |
| Amplifier Type | Headphone Amplifier |
| Inputs | RCA, Phono, HDMI |
| Outputs | Headphone |
| Class | Class D |
| Features | Built-in DAC |
| Dimensions | 10 × 8.28 × 10 inches |
| Weight | 3.44 pounds |
| Model | AS400 |
Frequently asked questions
Does the SMSL AS400 have a headphone jack?
Yes, the SMSL AS400 includes a dedicated headphone output on the chassis. This allows you to plug wired headphones directly into the amplifier without needing external adapters. You can switch between powering your main room speakers and listening privately whenever you prefer a personal audio session at your desk.
Can you use a turntable with the SMSL AS400?
Yes, the SMSL AS400 is designed for vinyl compatibility in an all-in-one chassis. You can connect your turntable directly into the unit without buying an external preamplifier box. This setup gives vinyl lovers an easy way to run record audio through the high-power Class D amplifier system.
What are the dimensions and weight of the SMSL AS400?
The SMSL AS400 measures 8.28 inches wide, 10 inches long, and 10 inches high. It weighs exactly 3.44 pounds. This compact profile ensures you can fit the amplifier onto crowded media consoles, tight shelving units, or small work desks without taking up excessive physical space.
Does the SMSL AS400 come with a built-in DAC?
Yes, the SMSL AS400 comes equipped with a built-in DAC. This hardware feature converts incoming digital audio signals into clean analog sound for playback. It allows you to feed digital sources straight into the unit, streamlining your audio chain without requiring a standalone digital decoding component.
Can you add a subwoofer to the SMSL AS400?
Yes, the SMSL AS400 features dedicated subwoofer outputs. You can wire an active subwoofer to the unit alongside your stereo speakers to handle low-frequency bass. This output support enables you to expand standard two-channel stereo playback into a complete, full-range 2.1-channel sound system for your room.
Does the SMSL AS400 support wireless audio?
Yes, the SMSL AS400 features wireless high-resolution audio capability. You can stream sound tracks wirelessly from compatible source devices straight to the amplifier. This feature lets you enjoy digital music without running long interconnect cables across your room to connect phones, tablets, or computers to the unit.