S.M.S.L SMSL AS400 165W Class vs S.M.S.L A300 Class D Stereo: Spec Comparison
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You are comparing the s m s l smsl as400 165w class vs a300 class d stereo from S.M.S.L. Both units deliver 165W per channel using Class D amplification and include dedicated subwoofer outputs for 2.1 setups. The main difference lies in their input capabilities and additional features. The AS400 includes a built-in DAC, MM phono stage, and comprehensive wireless codecs. The A300 focuses on precise volume control and BTL mode without a built-in DAC.
Key differences
| Aspect | SMSL AS400 165W Class D Amp with DAC | S.M.S.L A300 Class D Stereo Amp |
|---|---|---|
| DAC | Built-in CS43131 DAC with MQA support | Not listed |
| Phono Stage | Built-in MM phono amplifier | Not listed |
| Wireless Codecs | LDAC, aptX/HD, SBC, AAC | Bluetooth 5.0 |
| Volume Control | Not listed | NJW1194A electronic volume control chip |
| Power Output at 8 Ohms | Not listed | 85W per channel |
Which one should you choose?
Choose SMSL AS400 165W Class D Amp with DAC if
- You need a built-in DAC and MM phono stage for vinyl records
- You require high-resolution wireless audio with LDAC or aptX HD
- You want multiple EQ and filter options for sound tuning
Choose S.M.S.L A300 Class D Stereo Amp if
- You prefer a dedicated electronic volume control chip for precision
- You want BTL mode for mono operation or higher power into 4 ohms
- You prioritize a compact chassis with a full-featured remote
Verdict: Choose the AS400 if you need an all-in-one solution with a DAC and phono input. The A300 is better if you already have a DAC and value precise volume control or BTL mode. Both offer strong power for 2.1 speaker systems.
AS400 and A300 Spec Comparison
DAC and Vinyl
The SMSL AS400 includes a dedicated CS43131 DAC chip from Cirrus Logic, supporting high-resolution audio up to 32-bit/768kHz via USB. It also features built-in MM phono preamplification for direct vinyl connection. The A300 data does not list a built-in DAC or phono stage, focusing instead on amplification. If you need digital-to-analog conversion or turntable connectivity without extra gear, the AS400 is the practical choice.
Wireless Protocols
Both units support Bluetooth 5.0, but the AS400 offers a wider range of codec options including LDAC, aptX HD, SBC, and AAC. The A300 listing specifies Bluetooth 5.0 reception but does not detail specific codec support in the provided data. LDAC and aptX HD generally provide higher bitrate transmission than standard SBC. For users prioritizing maximum wireless audio fidelity, the AS400 provides more verified protocol options.
Power Output
Both amplifiers are rated at 165W per channel. The A300 specification clarifies this output occurs at a 4-ohm load, while producing 85W per channel at 8 ohms. The AS400 lists 165W x 2 but does not specify the impedance load for that rating in the provided data. Both use the Infineon MA5332MS chip. Without explicit impedance data for the AS400, the A300 offers more transparent power specifications for different speaker loads.
Sound Shaping
The AS400 provides 5 PCM filter options and 8 EQ settings, including Direct, Tone, SDB, Bass, Super bass, Rock, Soft, and Clear. The A300 also lists 8 preset EQ options and mentions SDB patented sound, along with treble and bass adjustment. Both units offer significant flexibility for matching different speakers. The AS400 explicitly lists more filter types, while the A300 confirms manual tone controls. This is a close match.
Build and Size
The A300 is constructed from aluminum alloy with CNC processing and anodizing, weighing 2.87 pounds with dimensions of 7.8 x 1.6 x 8.26 inches. The AS400 weighs 3.44 pounds and measures 8.28 x 10 x 10 inches. The A300 is significantly smaller and lighter, making it easier to fit on smaller desktops. The AS400 is larger and heavier. For compact setups, the A300 has the size advantage.
Which SMSL Amp Fits Your Needs
Vinyl enthusiasts wanting direct phono input
The AS400 includes a built-in MM phono amplifier, allowing you to connect a turntable directly without extra equipment. It also features a dedicated CS43131 DAC chip for high-resolution digital audio and supports multiple wireless codecs like LDAC and aptX HD. This makes it ideal for listeners who value analog warmth and versatile digital sources in one unit.
Users prioritizing precise volume control and remote
The A300 utilizes the Japanese NJW1194A electronic volume control chip for accurate adjustment and ultra-low distortion. It comes with a full-featured remote control for convenient operation. With Bluetooth 5.0 and a compact aluminum chassis, this amp offers stable wireless connectivity and precise audio management, making it suitable for those who prefer tactile control and remote accessibility.
Buyers seeking lower distortion and clear specs
The A300 lists a Total Harmonic Distortion of 0.004% THD+N, indicating clean signal processing. It delivers 165W at 4 ohms and 85W per channel at 8 ohms, ensuring consistent power across different speaker impedances. The BTL mode and dedicated subwoofer pre-out further enhance system flexibility. This data-driven approach appeals to listeners who prioritize measurable audio fidelity.
The products compared
SMSL AS400 165W Class D Amp with DAC
Best for: Users needing subwoofer output and phono stage
- 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 SMSL AS400 is a Class D stereo amplifier delivering 165 watts per channel. It features a 2.1-channel active audio system with an independent subwoofer output. The unit includes a built-in MM phono stage for vinyl records and supports high-resolution wireless protocols like LDAC and aptX HD. It uses the CS43131 DAC chip and offers multiple EQ settings for tailored sound.
Pros
- 165W x 2 power output
- Built-in MM phono amplifier
- LDAC and aptX HD support
- Independent subwoofer output
- CS43131 DAC chip
Cons
- No Bluetooth version specified in data
- Limited to MM phono cartridge type
- No remote control mentioned
Good fit if
- You need a dedicated subwoofer output
- You want to connect a vinyl player directly
- You prefer high-fidelity wireless audio codecs
Skip if
- You require a built-in remote control
- You need support for MC phono cartridges
- You want a compact desktop-only unit
Verdict: The SMSL AS400 Class D 165W Amp fits users who need a versatile amplifier with a subwoofer output and phono stage. It is ideal for setups requiring high-resolution wireless audio and analog vinyl integration.
S.M.S.L A300 Class D Stereo Amp
Best for: Desktop stereo setups needing sub output
- Power Output
- 165W at 4 ohms, 85W/ch at 8 ohms
- Amplifier Class
- Class D
- Audio Inputs
- RCA, USB
- Audio Outputs
- Subwoofer pre-out
- Wireless Connectivity
- Bluetooth 5.0
- Total Harmonic Distortion
- 0.004% THD+N
View on Amazon: S.M.S.L A300 Class D Stereo Amp Affiliate link
The SMSL A300 is a Class D integrated amplifier delivering 165W per channel into 4 ohms or 85W per channel into 8 ohms. It features Bluetooth 5.0, RCA, and USB inputs for versatile connectivity. The unit includes a dedicated subwoofer pre-out and adjustable treble and bass controls. You get precise volume adjustment via an NJW1194 chip. This compact aluminum unit suits desktop setups requiring clear, high-power stereo output.
Pros
- 165W output at 4 ohms per channel
- Bluetooth 5.0 with RCA and USB inputs
- Dedicated subwoofer pre-out for 2.1 systems
- Adjustable treble and bass EQ settings
- Low 0.004% THD+N distortion rating
Cons
- No optical or coaxial digital inputs listed
- No Wi-Fi or multi-room streaming support
- Limited to two-channel stereo configuration
Good fit if
- You need high power for 4-ohm speakers
- You want to add a subwoofer easily
- You prefer wireless Bluetooth connectivity
Skip if
- You require optical digital inputs
- You need multi-room audio streaming
- You want a full digital receiver
Verdict: SMSL A300 Class D Stereo Amp delivers robust 165W power and flexible connectivity for desktop audiophiles who want clean stereo sound and subwoofer support without complex digital inputs.
Specifications side by side
| Spec | SMSL AS400 165W Class D Amp with DAC | S.M.S.L A300 Class D Stereo Amp |
|---|---|---|
| Power Output | 165W x 2 | 165W at 4 ohms, 85W/ch at 8 ohms |
| Amplifier Class | Class D | Class D |
| Audio Inputs | USB, Coax, Opt, HDMI ARC, RCA, Phono | RCA, USB |
| Audio Outputs | Subwoofer, 4.4mm, 6.35mm | Subwoofer pre-out |
| DAC Chip | CS43131 | not stated |
| Wireless Connectivity | Bluetooth 5.1 | Bluetooth 5.0 |
| Total Harmonic Distortion | not stated | 0.004% THD+N |
| Connectivity | Bluetooth, USB | Bluetooth |
| Color | Black | Black |
| Amplifier Type | Headphone Amplifier | Integrated Amplifier |
| Inputs | RCA, Phono, HDMI | not stated |
| Outputs | Headphone | not stated |
| Class | Class D | Class D |
| Features | Built-in DAC | not stated |
| Dimensions | 10 × 8.28 × 10 inches | 8.26 × 7.8 × 1.6 inches |
| Weight | 3.44 pounds | 2.87 pounds |
| Model | AS400 | A300 |
| Size | not stated | A300 |
Frequently asked questions
Which amp is better for desktop use?
The SMSL A300 is the better choice for desktop setups. It measures 7.8 inches wide and weighs just 2.87 pounds, making it compact and lightweight. The AS400 is significantly larger at 10 inches wide and weighs 3.44 pounds, which may take up too much valuable desk space for some users.
Does the AS400 have a built-in DAC?
Yes, the SMSL AS400 includes a built-in DAC. This allows you to connect digital sources directly to the amplifier without needing an external digital-to-analog converter. The A300 data does not list a built-in DAC, so you would need to ensure your source device provides an analog output or use a separate converter.
Can I connect a turntable to the A300?
The provided data for the A300 does not mention a built-in phono stage. You cannot connect a turntable directly to the A300 without an external phono preamp. The AS400, however, includes a dedicated MM phono preamplification feature, allowing you to plug your turntable directly into the amplifier for analog vinyl playback.
Do both amps support Bluetooth?
The SMSL A300 explicitly lists Bluetooth connectivity in its attributes. This allows you to stream audio wirelessly from your phone or computer. The data for the AS400 does not mention Bluetooth support. You should verify if the AS400 includes wireless capabilities before purchasing if this feature is essential for your setup.
Are the power outputs equal?
Yes, both amplifiers deliver 165W of power output. They both utilize Class D amplification technology to achieve this performance. This means you can expect similar loudness levels from both units when driving compatible speakers, assuming you connect them in the same manner with the same speaker impedance.
Which unit is taller?
The SMSL AS400 is taller. It stands 10 inches high, whereas the A300 is much flatter at 1.6 inches high. If you have limited vertical clearance on your shelf or stand, the A300 will fit more easily. The AS400 requires more vertical space due to its larger chassis design.