The design is wonderful, but I had to change the tubes because the sound was very dull and the treble was very poor. After changing to new tubes, the sound is now excellent for 30 euros.

It provides a quality that cannot come from a product as small as a palm. It's amazing that you can even hear the last lingering notes of a classical guitar.

Really nice

It's a sound that can satisfy you for less than 20,000 yen. Personally, I think the cost performance is excellent. I am mainly listening by switching from DAP priced at 5 to 7 thousand yen to Bluetooth. I'm not sure if it's the DAP or the amplifier side, but sometimes there are audio skips. Since it's a vacuum tube amplifier, if I listen for an hour, the body gets hot, so I switch to another amplifier for listening. (I am a little worried about heat dissipation even though I understand it from the beginning)

I checked it on headphones and speakers.
Everything works. The package arrived quickly.

Very satisfied

Among all the items I've bought, this is the one I like the most. There is no white noise at all, and it matches well with the bookshelf (mirrored) speaker... The packaging is also perfect, with no flaws. I will use it well.

The delivery arrived well.

After using the product, I noticed some heat generation, so I contacted customer service. Thank you for the quick response.

The operating temperature of the amplifier is -5~85 ° It's called C.

They said they will follow up until the issue is resolved. The service is good.

It seems safe to use.

I really like the product. It is convenient to use.

I will use it well.

The t20x mk2 is great. It has a lot of power for the hard to drive headphones. Support got back to me in less than 24 hours too about a billing issue. Fosi is fantastic

I wrote a less than stellar review (4 stars) for this little amp partially because of the sound. Once installed, the 5654 tubes bring the tone and sound stage to life. The Russian tubes supplied sound two-dimensional and the imaging was lost. Fosi should do us a favor and include the better tubes as an option at checkout. The website has conflicting information regarding tube substitution and the staff seemed unsure when asked (two totally different answers). Now, I love the amp's power and sound, it's a serious little beast.

I'm very happy with this amplifier as the 3255 chip provides plenty of power for my inefficient desktop speakers. The lesser-powered Fosi MC331 is still my favorite sounding, feature rich amplifier; however, it can lack power if your speakers are power hungry. A few more features would make the T20X MKII a clear winner. Investing in adequate DC power is essential no matter which amplifier is chosen. I successfully use the amplifier's 3.5mm pre-out to supply a signal to a Fosi sub amp.

The amp is ok but the 2 tubes are from different makers and different years... its not great for the sound quality, tubes should be paired

Worth every penny spent

I recently received the item and am using it well.

However, after using it for a few hours, when I touch the case, it feels extremely hot.

I would like to know if this is normal or if it can be exchanged.

Tested out and it works amazing

**powerful and versatile home amplifier**



The fosi audio t20x mkii offers an impressive 300w of power with class d efficiency, complemented by the warmth of a vacuum tube stage. With bluetooth connectivity, it provides added convenience, making it an excellent choice for home theater or stereo speaker setups. Although compact, this amplifier is robust and drives speakers with clarity, delivering clear mids, punchy bass, and smooth highs. It offers great value as a versatile and powerful amplifier.