Description
Revolutionize Your Audio Experience with the Fosi Audio BT20A Pro 2-Channel Bluetooth Power Amplifier for Speakers
Unleash Sonic Brilliance: 300 Watts x2 Power Output
Immerse yourself in unparalleled audio clarity with the Fosi Audio BT20A Pro. Boasting a formidable 300 Watts x2 power output, this amplifier redefines your listening experience. The cutting-edge TI TPA3255 chip, featuring an advanced feedback design and a proprietary high-speed gate driver error correction, ensures not only exceptional audio performance but also high power efficiency, with idle losses below 2.5W.
Enhanced Efficiency: Tailor Your Sound with Upgraded Op-Amps
Experience a new level of efficiency with the BT20A Pro. Upgradeable with plug-ins like SS3602, MUSES02, OPA2604AP, and OPA2134PA Op-Amps, the amplifier offers a customizable sound quality experience. Enjoy an impressive SNR≥108dB and minimal THD≤0.005%, setting the stage for an audiophile-grade sound journey.
Seamless Connectivity: Bluetooth 5.0 Unleashed
Immerse yourself in the world of wireless connectivity with Bluetooth 5.0. Clear pairing is at your fingertips—just press and hold the volume control for five seconds. The amplifier also boasts a Bluetooth memory function, making future connections a breeze. Stay connected and receive alerts with an audible tone, ensuring an uninterrupted audio experience.
Precision Sound Control: Craft Your Sonic Landscape
Tailor your audio landscape with the BT20A Pro's unique sound control features. Revel in a wide range of bass and treble controls, or balance them for an unadulterated, original sound. Whether you prefer enhanced bass, heightened trebles, or the purity of unaltered audio, this amplifier caters to your preferences.
What's in the Box: Everything You Need for Audio Excellence
Your purchase includes the BT20A Pro Power Amplifier, a Bluetooth Antenna, a 32V 5A Power Adapter (with a plug that matches your country of delivery), an AC Cord, and a comprehensive User Manual. Enjoy peace of mind with our worry-free 12-month warranty and our commitment to friendly customer service.
Elevate Your Audio Universe with the Fosi Audio BT20A Pro—Where Sound Excellence Meets Innovation.
Model: BT20A PRO
Output Power: 300Wx2 @4Ω
Terminating Impedance: 2-8Ω
Input Mode: Bluetooth + RCA
Output Mode: Passive Speakers + Pre-out
Frequency Range: 20Hz-20kHz(±1.2dB)
THD: ≤0.005%
SNR : ≥108dB
Chip Set: TPA3255
Bluetooth Transmission Distance: Up to 50Ft
Bluetooth Transmission Format: SBC/AAC
Device Dimension: 5x5x1 inches
DC Input Range: 24-48V
Power Supply: 32V 5A
Warranty Period: 1 Year
What‘s in the box?
BT20A Pro Power Amplifier x 1
Bluetooth Antenna x 1
32V 5A Power Adapter x 1
AC Cord x 1
User’s Manual x 1
Warranty Period: 1 Year from the date of Invoice
Covered: Manufacturing Defects Only
Warranty Form: https://www.theaudiostore.in/pages/warranty-claim-form
Cable: 1-month warranty only for manufacturing defects only
Fosi Audio is a dynamic brand dedicated to providing the most comprehensive range of Hi-Fi audio products in the market. We cater to passionate audiophiles by offering Hi-Fi products, DIY kits, and expert guidance, ensuring an immersive audio experience. Beyond a mere transaction, we foster enduring relationships with our clients, supporting them throughout their audio journey.
Our diverse product lineup includes the Hi-Fi power amplifier, pre-amplifier, headphone amplifier, DAC, music player, Bluetooth receiver, DIY board, DIY chassis, and an array of DIY kits. These meticulously crafted offerings embody our commitment to exceptional sound quality and innovation.
Established in China in 2017, Fosi Audio was founded by a team of devoted audiophiles. Our products have gained significant popularity within the Chinese DIY audio community, amassing a large and dedicated following. To expand our reach beyond borders, we launched this website in 2017 and began offering a selection of products on Amazon under the name "Fosi audio." However, please note that many of our outstanding products are not yet available on this website or Amazon. If you cannot find what you're looking for, simply reach out to us via email, and we will be delighted to assist you in finding the perfect product to meet your needs.
At Fosi Audio, we are not just a brand; we are your partner in achieving audio excellence. Join us on this immersive sonic journey and experience the true essence of Hi-Fi audio.

Description
Revolutionize Your Audio Experience with the Fosi Audio BT20A Pro 2-Channel Bluetooth Power Amplifier for Speakers
Unleash Sonic Brilliance: 300 Watts x2 Power Output
Immerse yourself in unparalleled audio clarity with the Fosi Audio BT20A Pro. Boasting a formidable 300 Watts x2 power output, this amplifier redefines your listening experience. The cutting-edge TI TPA3255 chip, featuring an advanced feedback design and a proprietary high-speed gate driver error correction, ensures not only exceptional audio performance but also high power efficiency, with idle losses below 2.5W.
Enhanced Efficiency: Tailor Your Sound with Upgraded Op-Amps
Experience a new level of efficiency with the BT20A Pro. Upgradeable with plug-ins like SS3602, MUSES02, OPA2604AP, and OPA2134PA Op-Amps, the amplifier offers a customizable sound quality experience. Enjoy an impressive SNR≥108dB and minimal THD≤0.005%, setting the stage for an audiophile-grade sound journey.
Seamless Connectivity: Bluetooth 5.0 Unleashed
Immerse yourself in the world of wireless connectivity with Bluetooth 5.0. Clear pairing is at your fingertips—just press and hold the volume control for five seconds. The amplifier also boasts a Bluetooth memory function, making future connections a breeze. Stay connected and receive alerts with an audible tone, ensuring an uninterrupted audio experience.
Precision Sound Control: Craft Your Sonic Landscape
Tailor your audio landscape with the BT20A Pro's unique sound control features. Revel in a wide range of bass and treble controls, or balance them for an unadulterated, original sound. Whether you prefer enhanced bass, heightened trebles, or the purity of unaltered audio, this amplifier caters to your preferences.
What's in the Box: Everything You Need for Audio Excellence
Your purchase includes the BT20A Pro Power Amplifier, a Bluetooth Antenna, a 32V 5A Power Adapter (with a plug that matches your country of delivery), an AC Cord, and a comprehensive User Manual. Enjoy peace of mind with our worry-free 12-month warranty and our commitment to friendly customer service.
Elevate Your Audio Universe with the Fosi Audio BT20A Pro—Where Sound Excellence Meets Innovation.
Model: BT20A PRO
Output Power: 300Wx2 @4Ω
Terminating Impedance: 2-8Ω
Input Mode: Bluetooth + RCA
Output Mode: Passive Speakers + Pre-out
Frequency Range: 20Hz-20kHz(±1.2dB)
THD: ≤0.005%
SNR : ≥108dB
Chip Set: TPA3255
Bluetooth Transmission Distance: Up to 50Ft
Bluetooth Transmission Format: SBC/AAC
Device Dimension: 5x5x1 inches
DC Input Range: 24-48V
Power Supply: 32V 5A
Warranty Period: 1 Year
What‘s in the box?
BT20A Pro Power Amplifier x 1
Bluetooth Antenna x 1
32V 5A Power Adapter x 1
AC Cord x 1
User’s Manual x 1
Warranty Period: 1 Year from the date of Invoice
Covered: Manufacturing Defects Only
Warranty Form: https://www.theaudiostore.in/pages/warranty-claim-form
Cable: 1-month warranty only for manufacturing defects only
Fosi Audio is a dynamic brand dedicated to providing the most comprehensive range of Hi-Fi audio products in the market. We cater to passionate audiophiles by offering Hi-Fi products, DIY kits, and expert guidance, ensuring an immersive audio experience. Beyond a mere transaction, we foster enduring relationships with our clients, supporting them throughout their audio journey.
Our diverse product lineup includes the Hi-Fi power amplifier, pre-amplifier, headphone amplifier, DAC, music player, Bluetooth receiver, DIY board, DIY chassis, and an array of DIY kits. These meticulously crafted offerings embody our commitment to exceptional sound quality and innovation.
Established in China in 2017, Fosi Audio was founded by a team of devoted audiophiles. Our products have gained significant popularity within the Chinese DIY audio community, amassing a large and dedicated following. To expand our reach beyond borders, we launched this website in 2017 and began offering a selection of products on Amazon under the name "Fosi audio." However, please note that many of our outstanding products are not yet available on this website or Amazon. If you cannot find what you're looking for, simply reach out to us via email, and we will be delighted to assist you in finding the perfect product to meet your needs.
At Fosi Audio, we are not just a brand; we are your partner in achieving audio excellence. Join us on this immersive sonic journey and experience the true essence of Hi-Fi audio.
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OUR HONEST REVIEWS FROM THE CO-FOUNDERS & AUDIOPHILES
View allTRUSTED BY OVER 35K+ MUSIC ENTHUSIAST
Let customers speak for us
from 4738 reviews
From Blon bl2 to BGVP DN2
The jump on dunu was really worth it
Almost every genre songs this IEM drive at another level of dept n separation
Only flaw i could pin point some jpop heavy electric or high pinch voice of singers was little intolerable but other than it skillet and every other genre it nail it..
Accesories are another level really feel like worth the price and best customer care...
Tried every format from flac mqa to dsd . movies or series or anime . this earphone r all in one.
Bass timing silent timing Treble timing is all so perfectly tune (tried on LGV50)

If you are looking for a pair of headphones that would be your end game on a budget, then look no further, Edition XS is the way to go.
I have been using these for about 2 years and finally I can say, these cans a robust, dynamic and neutral to slightly bright.
But it also packs a punchy bass and has a good soundstage.
All you need is a pair of Edition XS and further you can keep leveling up the sound quality by upgrading cables to balanced ones, getting good DAC/AMPS and also modding the cans with new filters and grill.

Pros:
1. Sound is excellent for the price. I would say moondrop chu level sound quality. It follows the harman target with a little but turned down treble. Many people find the harman target a bit harsh at the top end. But this solves the issue.
2. I never had connectivity issues. Pairing was easy. As soon as I bring out the earbuds from the case, the buds automatically connects to my android phone.
Cons
1. App could be better. Obviously the app and other functionality won't be at the level of other mainstream tws like bose, samsung etc.
2. The fit. As someone who mostly uses wired iems. The tws does not feel as comfortable as the iems. For my ears, it's only comfortable for an hour or so. After that, it gets really uncomfortable.

I have been through some online videos/reviews before this purchase. My shortlist were, Moondrop Chu II, KZ Castor Pro, Wan'er SG. Audio Store was kind enough to provide demo of these to compare. Also Mr. Pritam shared valuable inputs on differences between my selected comparisons.
Very happy with the Tangzu Wan'er SG's output, everytime I listen to some of my old fav bolly songs it generates smile. Guess using it day by day increasing some sort of details or maybe I am getting use to. Best for listening for longer duration without fatigue. Bassheads may find it irrelevant to their taste. Over-all best Balanced tune IEM I must say which has some spark and doesn't feel boaring.

In the realm of audiophile excellence, where sound transcends mere listening and becomes an immersive journey, the Roseselsa Distant Mountain headphones emerge as a beacon of luxury and precision. Marrying vintage aesthetics with cutting-edge technology, these headphones offer a sublime auditory experience that caters to the most discerning of listeners.
Design and Build Quality
The Distant Mountain captivates with its retro-inspired design, reminiscent of the golden age of personal audio. The headband, crafted from solid stainless steel and adorned with genuine lambskin, ensures both durability and unparalleled comfort. The coaxial CNC-machined body exudes a high-gloss finish, presenting an extraordinary high-end texture that is both versatile and fashionable. 
Sound Performance
At the heart of the Distant Mountain lies an innovative 40mm composite topological diaphragm. This redesigned dome and corrugated ring deliver crisp, transparent treble and profound, surging bass. Enhanced by neodymium super magnets and an acoustic structure dedicated to small-sized headsets, the Distant Mountain presents richer sound details and a more natural treble extension, immersing the listener in melodious music. 
Comfort and Usability
The sponge ear pads are designed with both softness and breathability in mind, ensuring prolonged listening sessions remain comfortable. The headband supports fine length adjustments, with clearly visible scales to alleviate any concerns about symmetry. The inclusion of a stranded-free 5N single crystal copper IEM cable, coupled with a detachable MMCX design, offers high playability and customization for the user. 
Conclusion
The Roseselsa Distant Mountain is a testament to superb build quality and exceptional sound performance. Its unique tuning direction, reminiscent of high-fidelity in-ear monitors, combined with its luxurious design, makes it a standout choice for audiophiles seeking both style and substance. While it may require amplification to truly shine and could benefit from thicker earpads for optimal comfort, its value proposition remains compelling. For those who appreciate a blend of retro aesthetics and modern audio excellence, the Distant Mountain is an unrivaled choice. 
In the grand symphony of high-fidelity audio equipment, the Roseselsa Distant Mountain plays its notes , offering a professional and luxurious listening experience that is both nostalgic and forward-thinking.

I was not expecting much but this IEM sounds really good. If feels like a much more expensive IEM. The convenience thanks to the USB-C connection is great. I am able to use it on my phone, ipad and laptop. Gonna get some and gift some friends. This is a great gifting IEM / starter IEM !!!
I love the compatibility and the bill quality of the AUDIOCULAR d07, it works well with my samsung m53, . I also liked that u provide a case along with it , 😉

Good Sound Quality. Bass Treble Mid Too God Under 2k Price, Lookwise Good & Ear Fit & Gaming Experience To Good. & clear Sound Sense.
Earphone Case Too Good 👍 I like it.
Fast Delivery in 2 day delivery In My Address.

This is a solid technical iem with a very neutral tuning. Its a keeper iem for those who already have a collection of somewhat coluored or tasteful sounding iems under 10k .

Increased the volume as well as clarity of audio.
Thanks to the audio store for a quick delivery

This was my first experience with The Audiostore and it was welcoming. Happy with the service provided and customised suggestions as per need. Looking forward to buy next one. Thanks.

Awesome work

Fantastic easy to use dongel dac by Shanling. Build quality is also 👌. For a budget music lover this is a value for money. TAS keep providing such affordable quality product to us always...👍

Sparkling music, enhance volume and gives extra wide sound instrument but some time later connection gone if audio is not play

The CD player works as advertised. The single ended headphone jack has decent output, able to drive IEMs at a loud volume level. The coaxial output also works with a 3.5mm male to coaxial cable hooked to a pre-amp. Sound signature is unolocured in the territory of neutral to slightly bright neutral and corresponds well with recording and mastering of records. Worth the money imo.