SMSL PA200 is a highly efficient, compact Class D Power Amplifier

The SMSL PA200 is a compact, high-performance Class D power amplifier priced around $419 USD. It utilizes advanced Gallium Nitride (GaN) technology to deliver highly efficient, audiophile-grade sound with ultra-low distortion, operating either as a stereo integrated amplifier or as a pure, high-power mono block.

 

 

Key Specifications:

• Core Technology: Infineon GaN FETs capable of switching up to 1MHz for cleaner, more delicate highs and agileness.
• Volume Control: Texas Instruments PGA2311 chip, providing ultra-low distortion multi-step volume adjustments.
• Signal-to-Noise Ratio (SNR): 109 dB
• THD+N (Distortion): 0.003%
• Dimensions: 220 x 45.9 x 175 mm
• Weight: 1.44 kg

 

Technical Specifications

• Output Power (Stereo): 160W × 2 (4Ω), 85W × 2 (8Ω)
• Output Power (Mono BTL): 400W × 1 (4Ω), 250W × 1 (8Ω)
• THD+N (Total Harmonic Distortion): 0.003%
• Signal-to-Noise Ratio (SNR): 109dB
• Channel Separation: 75dB

 

 

Power Output Options:

Because of its flexible design, the PA200 can be used in different configurations depending on your speakers' demands:

• Stereo Mode (using 1 unit): 160W × 2 (at 4Ω) or 85W × 2 (at 8Ω)
• Mono/BTL Mode (using 2 units): 400W × 1 (at 4Ω) or 250W × 1 (at 8Ω) for driving demanding passive speakers.

 

Inputs & Outputs

• Inputs: 1x Stereo RCA (for stereo mode) and 1x Balanced XLR (for mono mode).
• Outputs: Heavy-duty, gold-plated speaker binding posts capable of accommodating banana plugs, spade lugs, or bare wire.

 

Operational Modes

The front-panel multi-function knob and included remote allow you to switch between three primary modes:

1. Stereo Integrated: Volume can be controlled from 0 to 70 via the built-in preamp.
2. Stereo Power Amp: Bypasses the internal volume control (ideal for pairing with a dedicated pre-amp, like the SMSL D200).
3. Mono/BTL: Uses the XLR input for maximum power (volume controlled by the source).

For further specifications or to order, you can explore the official SMSL PA200 product page or check out retailer listings like Apos Audio for more detail

 

PA200:

400W Amplifier

Infineon's latest GaN FET, with a switching frequency of up to1MHz, makes the full-band sound more delicate;

TI's advanced volume chip PGA2311 is used, with more steps volume control and ultra-low distortion;

Stereo pure amplifier pass-through mode, with SMSL D200 DAC & preamp, the sound is more direct and pure.

XLR input mono mode (volume is not adjustable), 2 units form stereo, power is increased by 4 times, and high power tolerant speakers are easily driven.

A large number of audio-grade components are used to enhance the subjective listening experience;

High-quality gold-plated input and output sockets;

Complete overheating, overcurrent and other protection circuits;

Built-in high-quality high-power audio grade switching power supply.

 

Notable Features

• Infineon GaN FETs: Allows for a switching frequency of up to 1MHz, delivering crisp, delicate sound while keeping heat and size down compared to older Class-D tech.

 

 Three Operation Modes:

• Stereo with Volume: Allows the amp to act as an integrated unit.
• Stereo Pass-Through: Bypasses volume control for direct pairing with a preamp or DAC.
• Mono (XLR) Block: Combines two PA200 units to achieve a 4x power gain.

Build Quality: Housed in a compact, full aluminum alloy chassis with gold-plated connectors and heavy-duty speaker terminals.

Safety: Built-in overheat and overcurrent protection circuits

 

User Perspectives:

• Pros: Users on forums like Head-Fi.org praise the PA200 for its vast power reserves in mono mode, lack of an ungainly external power brick, and very clean, transparent sonic signature.
• Cons: Reviewers and audiophiles have noted that the unit runs quite warm, even when in standby mode. Additionally, it lacks 12V triggers for automated power-on/off, and currently, there is no black colorway available (it comes in silver).

 

Here is the component list of the SMSL GaN Power Amplifier for your convenience:

It features an integrated aluminum alloy chassis. The front panel houses a display and a function knob, while the rear panel includes audio input jacks, speaker output connectors, and a power input socket. It supports a wide input voltage range of 100–240 V and offers both mono bridged and stereo modes.

After taking it apart, we found that it consists of a switching power supply module and a GaN amplifier module. The switching power supply uses two On-Bright OB2362D power supply chips, paired with WGSEMİ WGF65R190G MOSFETs and HWDZ HBR20200 rectifiers, forming a positive and negative power supply module that provides power to the GaN amplifier module.

The GaN amplifier module uses Infineon IGT60R070D1 GaN FETs, driven by Infineon IRS20957S drivers, and employs ADI AD825 operational amplifiers. The MCU is a Mind Motion MM32F103VET6, the digital potentiometer is a Texas Instruments PGA2311, and the NISSHINBO NJM2068D op-amp is used for pre-amplification.

On the underside of the GaN amplifier PCB, a thermal pad and an aluminum block are installed. A partition separates the power supply module and amplifier module, and HONGFA relays are used for audio signal switching. The build quality is solid, with reliable components.