STK4196MK10 -4174 Bluetooth 5.0 HIFI high-performance amplifier, far superior to LM3886

This device is renowned for its exquisite sound! (STK4196MK10 is a specially tuned power amplifier module customized for audio manufacturers, featuring warm and delicate, gorgeous and atmospheric sound that never gets old after prolonged listening)
As the saying goes, “The layout determines success or failure.” This machine has analyzed multiple major brand products and finally determined the current layout structure. It divides the rectification and filtering, protection, front-end power supply, and amplification into four areas, which should be a relatively reasonable arrangement at present
Power amplifier function: Equipped with a pass-through switch (second from left), allowing you to choose between accessing treble and bass tone adjustments or enjoying authentic amplification. For versions with Bluetooth functionality, the RCA input signal will be automatically cut off when Bluetooth is connected.

Regarding SANYO Semiconductor (a member company of ON Semiconductor)
Sanyo Semiconductor Co., Ltd., a member company of ON Semiconductor, is a semiconductor manufacturing company possessing excellent power device technologies, such as small package technology, high-efficiency switching technology, high-density packaging technology, and world-class analog technology. Several analog-related assets include extensive process technology, analog design technology, skilled analog engineers, and specially designed and manufactured excellent energy-saving and environmentally friendly devices, such as hybrid integrated circuits for inverters. Sanyo Semiconductor’s core devices include discrete circuits, general-purpose analog large-scale integrated circuits, ASSPs, and hybrid integrated circuits, which are widely used in various products such as personal computers, printers, cable television, mobile phones, audio-visual equipment, gaming devices, car audio systems, and air conditioners.
Sanyo STK, commonly known as Sanyo thick film, is not a level that ordinary amateur DIY players can achieve, thanks to its tuned sound and high-precision semiconductor process control. Besides better soundstage and resolution, its low-frequency dynamics are significantly stronger, completely distinguishing it from ordinary players and professional athletes! These thick film circuits have always been customized products specifically for major brand audio manufacturers. In the early days, many renowned factories used them to manufacture power amplifiers, such as K+H, Sony, Panasonic, Kenwood, JVC, Sansui, Sharp, Pioneer, and AIWA, almost all of which are Japanese audio manufacturers. They have been used for more than two decades, influencing an entire generation, and also the sound with a strong imprint of the era that our entire generation heard when we were young. It is unforgettable every time we listen to it. The company that specialized in producing power amplifier modules was later acquired by ON Semiconductor, which integrated Sanyo’s traditional craftsmanship with ON’s unique design, making later products even more outstanding. They are still adopted by major American companies such as BOSE, and European companies like Genelec!
I was fortunate to encounter a batch of brand-new power amplifier modules STK4196MK10 produced by SANYO in the later stage. This model is actually the final improved version of the STK419X series. Its external packaging size is the same as that of STK4191X, and they can be directly interchanged. The design output power is 50W+50W @8 ohms, with a distortion level of THD0.01%, which is also on par with STK4191X. It can drive general bookshelf or floor-standing speakers to achieve satisfactory results. This thick-film chip was only supplied to manufacturers who made complete machines, so it is relatively rare to see on the market. As a comparison, the LM3886 power amplifier chip, whose PDF file shows a power of 68W obtained under a 4 ohm load, only has a power of 38W at an 8 ohm load, far lower than the 50W of STK4196MK10. Moreover, its distortion level of 0.03 is also three times that of STK4196.
This machine is designed according to standard product specifications, featuring both versions with and without Bluetooth, and adjustable treble and bass settings. The entire machine is constructed from CNC-machined all-aluminum alloy, and includes a centrally-located radiator for isolation of the power supply and amplification sections, ensuring minimal interference. The power supply of this machine is divided into three groups, providing power to the amplifier, pre-amplifier, and protection sections respectively. The radiator of this machine is independently designed, connecting both the base plate and cover plate to increase the effective heat dissipation area, resulting in an elegant and compact appearance. This machine is equipped with a treble and bass adjustment circuit for ease of use.

Basic performance parameters:
Operating mode: Class AB
Static current: 80 mA
Output power: 50W+50W/8Ω, distortion 0.01%
Frequency response: 20Hz to 50KHz
Dynamic range: >100 dB
Overall dimensions: 172*67*301MM
Overall weight: 4.4KG (with packaging, express delivery fee charged at 5KG)

Note: Product images, videos, text, and other related descriptions were all created at a certain time and are for reference only. Changes may occur without notice, and the specific details are subject to the actual product received.

The following is the STK4174 version
Brand new SANYO STK4174MK2 chip inventory, this model is an improved version of the STK41X1 classic series, which is a relatively early product. The design at that time was conservative, with solid materials and rigorous tuning. The design output power is 40W+40W @8 ohms, with a distortion level of THD0.4%. Not all extreme parameters necessarily represent good sound, just like how many people still prefer the sound of tube amplifiers nowadays. The performance parameters may not be high, but the sound is mellow and delicate, like aged wine, with more flavor as you taste it. Therefore, this time we chose a classic retro design, both in terms of sound and appearance, to retain the original style. This unit uses a pure copper-wound toroidal transformer, which excels in the mid-to-high frequency range and strives to reproduce the kind of sound that once touched the soul with solid materials. This unit can drive general bookshelf or floor-standing speakers to achieve satisfactory results.

Basic performance parameters:
Working mode: Class AB
Static current: 80mA
Output power: 40W+40W/8Ω, distortion 0.4%
Frequency response: 20Hz to 50KHz
Dynamic range: >100 dB
Overall dimensions: 172*67*301MM
Overall weight: 4.4KG (including packaging; express delivery fee charged at 5KG)