SMSL PA40
High-Performance Digital Power Amplifier
- NJU7391A Electronic Volume Control Chip
- MA5332 Amplifier Chip
- Gold-Plated Terminals
- Built-in Preset EQ
- Protection Circuits
- High Efficiency and Low Energy Consumption
- Remote Control
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Estimated Delivery:Oct 18 - Oct 22
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Free Standard Shipping & Returns On all orders. Check if your country applies.

SMSL PA40
High-Quality Components for a Superior Listening Experience
The PA40 amplifier is designed with premium components to ensure excellent sound quality and reliable operation, featuring overcurrent, overheating, and under-voltage protection circuits for a seamless and safe listening experience. At its core is the NJU7391A electronic volume control chip from Nisshinbo Micro Devices, a 2-channel chip that provides low noise, low distortion, and supports surround sound and tone control to enhance audio performance. Complementing this is the MA5332 Class D amplifier chip from Infineon, which offers standard protection and reliable performance in various environments. With its high energy conversion efficiency, the PA40 minimizes heat generation and energy consumption.
Audiophile-Level Sound Quality
The PA40 amplifier delivers exceptional audio performance with its low distortion, low noise, and wide dynamic range. It surpasses traditional amplifiers in sound quality, offering clearer audio, reduced noise, and enhanced low-frequency response.
Gold-Plated Terminals
The PA40 amplifier is equipped with high-quality gold-plated input and output terminals, designed to offer superior durability and conductivity. These terminals not only ensure a longer service life by resisting corrosion but also reduce the need for frequent maintenance, providing a stable and reliable connection for optimal audio performance.
Built-in Power Supply
The PA40 features a built-in power supply, eliminating the need for additional adapters and reducing cable clutter to keep your workspace neat. This design not only minimizes potential electromagnetic interference from external adapters but also ensures a stable power source, optimizing the amplifier’s overall performance. Additionally, the built-in power supply makes the unit easier to carry, install, and move, offering convenience and portability.
Remote Control
The PA40 comes with an easy-to-use remote control, allowing you to conveniently power on/off, switch functions, adjust volume, and turn off the screen from a distance. For detailed operation instructions, please refer to the user manual.
EQ, Bass, and Treble Adjustment
While powered on, each short press of the knob cycles through adjustments for "Volume," "EQ," "Bass," "Treble," "Gain," and "Brightness," allowing you to fine-tune your audio settings with ease.
Free Standard Shipping
We Offer FREE Standard Shipping on all orders to Most of the World*
1 Year Warranty
Your Headphones, IEM's, AMPs and DACs, are covered by a warranty against factory defects.
Authentic Products
HiFiXAudio is an official distributor of the brands we carry. All products are genuine.
FAQ's
How long does it take to process an order?
For in-stock products, your order is expected to be shipped within 3 working days. Customized items and pre-orders take a longer time (do check in with our staff for more information). On normal non-sale days, once your parcel is shipped:
- For Standard Shipping, it takes about 2-3 weeks for items to be delivered after it is shipped. For some countries, it might take up to 1-2 months, depending on your country and its custom procedure. The duration for transit is beyond our control. Mechlands does not arrange refunds for such cases. Please consider an upgrade to DHL Express or keep the waiting time in mind.
- For Express Shipping, it takes about 3-10 days for items to be delivered after it is shipped.
Note:
Shipping methods and period might be affected and changed due to festive seasons, pandemic circumstances or other unforeseen circumstances.
What kind of shipping do you offer?
We have two shipping methods - Standard Shipping and Express Shipping.
Standard Shipping is free for most countries/areas.
Express Shipping via DHL Express or FedEx is 10-40USD (excluding tax) depending on your country. If your order is over 500USD, DHL Express Shipping is free*.
*KiiBOOM keyboards are not eligible for free shipping.
Shipping fees exclude import taxes or processing fees that may be applicable for your country. Mechlands is not responsible for such fees. Should you refuse to pay the tax/customs fees, shipping fees will still be deducted from the amount paid for the two-way freight charges. The cost of the freight charges may be more than the amount reflected on your order due to tax and other miscellaneous fees.
Standard Shipping via YunExpress is a tax-inclusive option for some countries. However, Mechlands will not be responsible for additional administrative or handling fees charged by your local courier company or customs. Please kindly check this with your local customs.
For certain remote areas, there may be additional charges via Express Shipping. We will contact you if there is a need to make additional payments. Should you have any other queries regarding shipments, please contact us before placing an order.
Who does pay for the import tax/custom fees?
Customers have to bear any form of custom/import/processing fees that are applicable for your parcel.
If the custom fees and the delivery of the parcel are rejected by the recipient, the shipping cost still needs to be paid. Mechlands only arranges the refund of the order amount after deducting the shipping cost incurred.
Which countries do you ship to?
We are generally able to ship to most countries via Express Shipping, and many countries via Standard Shipping. Shipping methods may alter due to different situations. After proceeding to Checkout, the available shipping method(s) and cost will be stated before the payment page.
Note:
Note: For countries and areas of Africa, Alaska, Argentina, Canada, Hawaii, Kuwait, Mauritius, Montenegro and Sri Lanka, to name a few, we can only do Express Shipping. This may be subjected to changes due to unpredictable events such as pandemic, war, and etc.
How do I cancel order?
Cancellation or/and modification of orders can only be done manually via our staff, provided that our Warehouse Team has not processed your order.
As our Support Team may not be available during non-working days and weekends, please place your order wisely as support cannot be guaranteed for such requests.
Should you really need to cancel or/and modify your order after purchase, please contact us via our support email (support@mechlands.com) or website chat. We will help you with the changes if that could be done.
For other queries, the fastest way to contact us is via our website or Discord
Do I get tracking details for my order?
After placing an order, you will receive the order confirmation email. After your order is shipped, you will also receive a tracking email. You can track your order via the tracking number online. Should you not have received the emails or face any difficulties tracking your order, please kindly contact us for support.
What if i dislike the product once it arrives?
On the ground of disliking a product, you may return any non-customized and non-sales product that is sealed, within the 15 days upon receiving it. To be eligible for a return, your item must be unused and in the same condition that you received it. It also must be in the original packaging. Customized and sales products, accessories, or spare parts are excluded from the 15-day return policy. The shipping fee, handling fees, or any form of tax caused by return will NOT be refunded.
My product came with some kind of factory issue
For factory defective items within the first 30 days upon delivery, you would need to provide a solid proof. All customers are strongly advised to take an unboxing video of their parcel and packaging. If the item is defective due to manufacturing issues instead of unguided manual modifying/disassembling, Epomaker will provide a shipping label and reship the replacement unit or refund to you after receiving the return parcel.
Who applies to your free 15/30 Days Return Policy program?
*Our 15-day & 30-day warranty applies only to the following countries Canada, United States, Netherlands, Poland, United Kingdom, Czech Republic, Australia, Brazil, Saudi Arabia, Spain, Ukraine, France, Mexico, Italy, Chile, South Korea, Japan, Switzerland, United Arab Emirates, Portugal, Israel, Russia, Belgium and Germany. Customers in other countries may incur additional fees for warranty service.