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Fosi Audio BT30D Bluetooth 5.0 Stereo Audio Receiver Amplifier 2.1 Channel Mini Hi-Fi Class D Integrated Amp 50 Watt x2+100 Watt for Home Outdoor Passive Speakers/Subwoofer Powered Subwoofer

4.5 4.5 out of 5 stars 2,442 ratings

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About this item

  • 2.1CH Bluetooth 5.0 Power Amplifier: Exquisite design, improved operation, great sound performance.
  • BT30D supporting Bluetooth and RCA input can drive most home passive speakers, passive/powered subwoofer. SUB volume/Frequency, Bass/Treble control ensure Hi-Fi music quality.
  • BT30D wireless stereo amplifier adopts 2 pcs Texas Instruments TPA3116D2 chip. The TPA3116D2 are stereo efficient and digital amplifier power stage for driving speakers, with advanced oscillator/PLL circuit employs a multiple switching frequency option to avoid AM interferences. High-performance effectively improve output power and audio quality. Max power output up to 200Watt.
  • Bluetooth 5.0 stereo audio amplifier receiver, increase the stability, sound quality and use distance, streaming range up to 50ft, works with latest devices including smartphone, tablet, laptop, computer, etc.
  • What You Get: BT30D Amp x1, 24V/4.5A power supply x1, user manual x1, our worry-free 24-month warranty, and friendly customer service.
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Fosi Audio BT30D Bluetooth 5.0 Stereo Audio Receiver Amplifier 2.1 Channel Mini Hi-Fi Class D Integrated Amp 50 Watt x2+100 Watt for Home Outdoor Passive Speakers/Subwoofer Powered Subwoofer
Fosi Audio BT30D Bluetooth 5.0 Stereo Audio Receiver Amplifier 2.1 Channel Mini Hi-Fi Class D Integrated Amp 50 Watt x2+100 Watt for Home Outdoor Passive Speakers/Subwoofer Powered Subwoofer
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Price-10% $89.99
List:$99.99
$56.99$109.99$89.99$99.99$89.99
Delivery
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Customer Ratings
Volume control
4.6
4.3
4.6
4.6
4.6
Sound quality
4.3
4.1
4.6
3.8
4.5
Value for money
4.6
4.5
4.5
4.6
Bluetooth connectivity
4.5
4.8
4.5
4.6
Sold By
Fosi Audio
XRONG
Fosi Audio
Arylic Audio
RuiMo
Fosi Audio
number of channels
2
2
2
2
2
2
connectivity tech
Bluetooth, RCA
Bluetooth
Bluetooth
DAC, Optical
Bluetooth, Auxiliary
Bluetooth, USB
control method
remote
remote
remote
application, remote
touch
controller type
Mechanical knob
iOS
Android
GO CONTROL, Infrared Remote Control
Manual control
Android
audio output type
Speakers
Speakers
Speakers
Speakers
Speakers
Speakers
model number
BT30D
BT30D PRO
B50 SE
DS300
BL20C
output wattage
200 watts
200 watts
160 watts
50 watts
100 watts
320 watts

Product Description

Fosi Audio BT30D Bluetooth 5.0 Stereo Audio Receiver Amplifier 2.1 Channel Mini Hi-Fi Class D Amp
Bluetooth 5.0 Stereo Audio Receiver Amplifier 2.1 Channel Mini Hi-Fi Class D Integrated Amp

Fosi Audio BT30D Bluetooth 5.0 Stereo Audio Receiver Amplifier
Our Story

Fosi Audio was founded with a simple goal: Build products that sound great and make people want to listen to music every day. We design, manufacture, and sell many Hi-Fi audio products on the market. We pursue your perfect music journey. Enjoy Hi-Fi music with Fosi Audio audio products!

Product Parameters:

2.1 CH Bluetooth Stereo Amp

  • Power Adapter: 24V/4.5A
  • DC Input Range: 12-24V
  • THD: ≤ 0.04%, SNR: ≥ 98dB
  • Frequency Range: 20Hz - 20kHz (±1 dB)
  • Input Sensitivity: ≤ 280mV;
  • Terminating Impedance: 2 - 8 Ohm
  • MAX Power Output: 50W x 2+100W
  • Input Mode: Bluetooth and RCA
  • Bluetooth Transmission Distance: Up to 50 Ft
  • Package Include: BT30D Amp, Power Supply, User Manual

  • 2 Channel Power Amp: BT10A, BT20A, TB10A, TB10D, V1.0B, V1.0G, TDA7498E, ZK-1002, ZK-502T.
  • 2.1 Channel Power Amp: BT30D, BT30D Pro, BL20A, BL20C, ZK-TB21.
  • DAC: Q4, K5 Pro, DS1, DS2. DAC Amplifier: PH04, DA2120A, DA2120C.
  • Subwoofer Amp: TP-02, M01-BT, M02, M03, M04.
  • Phono Preamp: BOX X1, BOX X2, BOX X3, BOX X4. Tube Preamp: P1.
  • Tube Headphone Amplifier: T20, T20X, P2.
  • Class AB Amplifier: T3.

Bluetooth 5.0 Stereo Audio Receiver Amplifier 2.1 Channel Mini Hi-Fi Class D Integrated Amp

Bluetooth 5.0 Stereo Audio Receiver Amplifier 2.1 Channel Mini Hi-Fi Class D Integrated Amp

Bluetooth 5.0 Stereo Audio Receiver Amplifier 2.1 Channel Mini Hi-Fi Class D Integrated Amp

Add powerful home theater-quality sound performance to your desktop with a compact amplifier style.

Deliver clear, accurate sound that's loaded with Subwoofer volume and frequency control.

The upgraded DC outlet with a built-in power protection circuit, is safe for use.

Bluetooth 5.0 Stereo Audio Receiver Amplifier 2.1 Channel Mini Hi-Fi Class D Integrated Amp

Bluetooth 5.0 Stereo Audio Receiver Amplifier 2.1 Channel Mini Hi-Fi Class D Integrated Amp

Bluetooth 5.0 Stereo Audio Receiver Amplifier 2.1 Channel Mini Hi-Fi Class D Integrated Amp

The Fosi Audio BT30D Bluetooth Stereo Amplifier Receiver is the perfect solution for all of your audio needs!

Bluetooth 5.0 wireless audio streaming along with RCA jack to directly connect & stream audio from external devices.

Fosi Audio BT30D amp comes with an energy-efficient and stable 24V/4.5A power supply that can get efficient output power.

Bluetooth 5.0 Stereo Audio Receiver Amplifier 2.1 Channel Mini Hi-Fi Class D Integrated Amp

In order to fix the issue you may have more effectively, here are some tips:

--About Bluetooth connectivity issue:

1. Ensure that all wiring is correct.

2. There is no signal interference nearby.

3. Try using a different power source and outlet.

4. If there are multiple input modes, check whether other input modes work properly.

5. Try using different Bluetooth devices, speaker wires, and speakers.

6. Change the environment.

7. If there is a Bluetooth antenna included, ensure that it is connected correctly and try using a different antenna.

--About sound issue or not working properly:

1. Make sure all the cables are fully connected.

2. Adjust the treble and bass control of the power amplifier to achieve the right tone.

3. Please try to change the sound source and cables to test.

Bluetooth Stereo Audio 2 Channel Amplifier Receiver Mini Hi-Fi Class D Integrated Amp Home Speakers Bluetooth Stereo Audio 2 Channel Amplifier Receiver Mini Hi-Fi Class D Integrated Amp Home Speakers Fosi Audio BT30D Pro Hi-Fi Bluetooth 5.0 Stereo Audio Receiver Amplifier Fosi Audio BT20A Pro 300W x2 TPA3255 Bluetooth 5.0 Home Audio Stereo 2 Channel Amplifier Bluetooth Stereo Audio 2 Channel Amplifier Receiver Mini Hi-Fi Class D Integrated Amp Home Speakers Fosi Audio Subwoofer Amplifier 100 Watt
V3 BT30D BT30D PRO BT20A PRO BL20C-N T3
Customer Reviews
4.5 out of 5 stars
503
4.5 out of 5 stars
2,442
4.5 out of 5 stars
508
4.6 out of 5 stars
1,005
4.6 out of 5 stars
779
4.1 out of 5 stars
58
Type 2.0 CH Amp Bluetooth 2.1 CH Amp Bluetooth 2.1 CH Amp Bluetooth 2.0 CH Amp Bluetooth 2.1 CH Amp Bluetooth Tube 2.1 CH Amp
MAX Power Output 300W x 2 50W x 2+100W 165W×2+350W 300W x 2 160W x 2 50W x 2
Input RCA Bluetooth + RCA Bluetooth + RCA Bluetooth + RCA Bluetooth + RCA + U-disk Bluetooth + 3.5mm AUX1+3.5mm AUX2
Output Passive Speakers+Pre-Out Passive Speakers+Active/Passive Subwoofer Passive/Active Speakers+ Passive/Active Subwoofer Passive Speakers+Active Speakers/Sub/Amp Passive Speakers + Active Subwoofer Passive Speakers + Active Subwoofer+ Headphone
Treble & Bass Control x
THD <0.003% ≤ 0.04% ≤ 0.3% ≤ 0.005% ≤ 0.05% ≤ 0.1%
SNR ≥110dB ≥ 98dB ≥ 85dB ≥108dB ≥ 98dB ≥ 80dB
Terminating Impedance 2-8 Ohm 2-8 Ohm 2-8 Ohm 2-8 Ohm 2-8 Ohm 4-8 Ohm
Power Adapter 32V/5A 24V/4.5A 32V/5A 32V/5A 24V/4.5A -
Work Voltage AC 110V - 240V AC 110V - 240V AC 110V - 240V AC 110V - 240V AC 110V - 240V AC 110V - 240V
Fosi Audio Bluetooth Hi-Fi Stereo Tube Amplifier Receiver Headphone Amp Phono Preamp Headphone Amplifier Preamplifier Hi-Fi Pre Amp JAN 5654W Vacuum Tubes MM Turntable Fosi Audio Box X2 Phono Preamp for MM Turntable Phonograph Preamplifier Phono Preamp Headphone Amplifier Preamplifier Hi-Fi Pre Amp JAN 5654W Vacuum Tubes MM Turntable Fosi Audio BT20A Bluetooth 5.0 Stereo Audio 2 Channel Amplifier Receiver Fosi Audio DS2 Portable USB C DAC DSD512 ES9018K2M Headphone Amp
K5 Pro T20 BOX X2 BOX X4 DS1 DS2
Customer Reviews
4.2 out of 5 stars
489
4.4 out of 5 stars
1,181
4.6 out of 5 stars
2,423
4.1 out of 5 stars
589
4.2 out of 5 stars
157
4.2 out of 5 stars
41
Type DAC+Headphone Amp Bluetooth Tube 2.0 CH Amp Phono Preamp with Vacumm Tubes Phono Preamp with Vacumm Tubes DAC+Headphone Amp DAC+Headphone Amp
MAX Power Output Note: It cannot be directly connected to passive speakers, but can only be connected to active speakers or amplifiers. 50W x 2 Note: It cannot be directly connected to passive speakers, but can only be connected to active speakers or amplifiers. Note: It cannot be directly connected to passive speakers, but can only be connected to active speakers or amplifiers. 120mW@32 Ohm(SE); 220mW@32 Ohm(BAL) 120mW@32 Ohm(SE); 250mW@32 Ohm(BAL)
Input USB-C + Optical + Coaxial+3.5mm Microphone Bluetooth + RCA RCA+3.5mm AUX RCA+3.5mm AUX Type C+ USB A Type C+ USB A
Output RCA + 3.5mm Headphone Passive Speakers + Headphone Active Speakers RCA+3.5mm AUX 3.5mm Headphone+ 4.4mm Headphone 3.5mm Headphone+ 4.4mm Headphone
Treble & Bass Control x x x
THD <0.003% ≤ 0.04% ≤ 0.1% ≤ 0.1% ≤ 0.0006%(SE) ≤ 0.001%(BAL) ≤ 0.0006%(SE) ≤ 0.001%(BAL)
SNR >110dB ≥ 98dB ≥ 98dB ≥70dB ≥120dB ≥108dB
Terminating Impedance 16-300 Ohm 2-8 Ohm - - 16-300 Ohm 16-300 Ohm
Power Adapter - 24V/4.5A 12V/1.5A 12V/1.5A - -
Work Voltage USB-C/DC5V AC 110V - 240V AC 110V - 240V AC 110V - 240V - -

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Product Warranty: For warranty information about this product, please click here

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Fosi Audio BT30D Bluetooth 5.0 Stereo Audio Receiver Amplifier 2.1 Channel Mini Hi-Fi Class D Integrated Amp 50 Watt x2+100 Watt for Home Outdoor Passive Speakers/Subwoofer Powered Subwoofer


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Customer reviews

4.5 out of 5 stars
4.5 out of 5
2,442 global ratings

Customers say

Customers like the sound quality, value, quality, size and power output of the amplifier. For example, they mention that it's very good for an inexpensive system, has a master volume for the whole system and that it runs cool. They appreciate the small size and that the amp is built well. They are also impresseded with the power output, saying that it has plenty of power.

AI-generated from the text of customer reviews

242 customers mention172 positive70 negative

Customers like the sound quality of the receiver or amplifier. They mention that the sound is very good, plenty loud, and fine-tuning your audio is easy. The product has a subwoofer output and 2 controls for the subwooFER. It has PLENTY of power for these speakers and a master volume for the whole system. The resolution and thump is truly awesome, and it has'massive push' for the speakers.

"...It’s rated at 50+50+100w. It’s plenty loud, however be aware it ships with a switching power supply that can deliver only about half of that wattage..." Read more

"...speakers and a small subwoofer in the bedroom, and this thing has a subwoofer output! That’s rare AND awesome!..." Read more

"...Apparently one of the best purchases I've ever made. The sound is AWESOME - even better than before!..." Read more

"...There is a master volume for the whole system once the other controls are set...." Read more

128 customers mention109 positive19 negative

Customers like the quality of the amplifier. They say it's well built, sounds great, and runs cool. They also appreciate the good materials and the decent Bluetooth. Overall, customers are happy with their purchase and recommend it to others.

"...its size it’s punching well above its weight and the BT implementation sounds quite good...." Read more

"...The control pots seem to be nice quality although no detents are present. The speaker connections are of fair quality...." Read more

"...It’s a great deal and a great product." Read more

"...Build quality seems to excellent and I would fail to see how this item would break...." Read more

88 customers mention62 positive26 negative

Customers like the connectivity of the amplifier. For example, they mention it has a seamless Bluetooth connection, a solid Bluetooth connection and good range. Some say the signal was fine over Bluetooth and that the device connection is solid at all usable ranges.

"...Bluetooth range has also been solid throughout the area. This is probably due to the external no-compromise BT antenna...." Read more

"...The bluetooth support is solid and connects flawlesly and fast. The control pots seem to be nice quality although no detents are present...." Read more

"...Bluetooth connection is easy and also the sound from the Bluetooth was great quality but very focused/sterile...." Read more

"...speakers and and I am quite happy, however, there is about a 1 second delay before my speakers actually start playing audio...." Read more

83 customers mention76 positive7 negative

Customers are satisfied with the performance of the amplifier. They mention that it works well, the Bluetooth range is good, and the tone knobs are effective at doing what they should be. The whole setup works brilliantly, and it works great for outdoor speaker setups. The Bluetooth works as advertised, and is a nice addition to an amp. The tone knob is good and works pretty well at balancing out and fine-tuning your audio.

"...Unsightly, but it worked well and sounded nice...." Read more

"This little amp works great for what it is. Knowing what it is is the key to beign hapy with it...." Read more

"...Have never experienced an audio/connectivity hickup with it. Still works great, still sounds awesome. Perfect 10 out of 10, would buy again." Read more

"...Both the plug and the bluetooth inputs work great, although I primarily use the bluetooth connection which has amazing range...." Read more

64 customers mention60 positive4 negative

Customers appreciate the value of the amplifier. They say it provides incredible sound for almost no money, and is a great option for a budget system. Customers also say the quality far exceeds the price.

"...I've only been using it for a day but, unless it smokes, it's a decent value." Read more

"...It’s a great deal and a great product." Read more

"...Decently priced as well. This is my second Fosi Audio amp as I also have a different model to use for bass shakers...." Read more

"...My EQ had more of an effect. This is good value for money if you have a 2.1 system. Great for bedrooms or living rooms." Read more

47 customers mention47 positive0 negative

Customers like the size of the amplifier. They say it's small enough to sit unobtrusively by the bed, and is a perfect fit for a little home office or a medium sized home gym. Customers also appreciate the space-saving design and bluetooth connectivity. Overall, customers are happy with their purchase and recommend it to others.

"...The amp is small enough not to notice on top of the fridge, and looks pretty smart. I’d buy it again...." Read more

"...It’s small enough to sit unobtrusively by the bed, so within easy reach and no remote required...." Read more

"...I like that the BT30D is physically small, but that means there's limited space in back for all of the various ports...." Read more

"...Still a great value for the money, and oh so compact. I might add a sub amp to the box later." Read more

44 customers mention34 positive10 negative

Customers like the power output of the receiver or amplifier. For example, they say it has ample power, is amazing, and hasn't been an issue. Some say it can power bookshelves speakers and a powered subwoofer well.

"...Power enough to drive my relatively large (for a desktop system) JBL speakers.Once again in music heaven.--..." Read more

"...They put out decent power I am not even at half volume, however I am using it for nearfield listening so I don't need too much to juice them...." Read more

"This amplifier surprised me. It has a lot of power for such a little thing. It ran my speakers and subwoofer up to 86db without issue...." Read more

"...Does a great job for near-field listening, though it may be a bit underpowered if you're goal is to fill your entire home with sound...." Read more

40 customers mention37 positive3 negative

Customers like the volume control of the amplifier. They say it's easy to adjust the subwoofer parameters, such as volume and frequency cutoff. They also appreciate the variety of sound adjustment knobs. The sub frequency adjustment allows tuning to any sub. Customers also like that the amplifier has a fully adjustable sub-woofer channel that can power any subwoof.

"...The best part is the sub output can be configured (fine tuned) just like my old car-system crossover + amp, with the frequency and gain (volume)..." Read more

"...The adjustment knobs functioned and the subwoofer output was reasonable...." Read more

"...I absolutely love how I can control not only the bass/treble from the unit itself, but also the subwoofer frequency and volume...." Read more

"...It allows you to customize the sub freq and the sub volume, so you control how much bass you get from the sub...." Read more

Works really well, power supply could be better. Part of a whole Amazon-sourced solution.
5 Stars
Works really well, power supply could be better. Part of a whole Amazon-sourced solution.
Music is a huge and daily part of our lives. Because we don’t like to overdrive the living-room system just to also “light up” the kitchen area with sound, I’ve kept a small (homebrew) 18+18W amplifier and Minimus 77 speakers on top of our fridge for years. It was linked to the living-room system via a stereo audio isolation transformer, and a Bluetooth receiver with an audio switch. Unsightly, but it worked well and sounded nice. With a recent remodeling of the kitchen and living-room areas, a better-looking solution was required. With a 12x12 soffit running in an “L” shape above all of the kitchen cabinets, in-wall speakers were the obvious choice. We ordered a set of Dayton Audio ME625W in-wall 2-way units and as I will get into later, eventually added a Dayton Audio DCS165 subwoofer and quasi-matching grille, all via Amazon. (The Pyle and FOSI amplifiers mentioned here were also Amazon purchases.)My first choice for a new small amp to power this was the Pyle PFA540BT unit with built-in FM radio and Bluetooth features. That unit was bought as an open box from Amazon. While plenty loud, it had a subtle but definite grating midrange distortion once warmed up that I did not notice until it was outside of the return window. My bad, these new parts all sat around while we finished the other renovations. We all agreed it was annoying, even my kids. Additionally, the switch-mode power supply for that amp was so noisy (RF-wise) that the radio receiver only would pull in one station, with a local antenna from only a couple of miles away. The rest of the band was utterly swamped out. (No FCC cert logo visible on the PSU, now we know why).My second amp was a FOSI audio unit, the BT30D, which is much better. No radio, but BT and line in. As a plus, it’s a 2.1 system with a dedicated drive channel for a passive sub. It’s rated at 50+50+100w. It’s plenty loud, however be aware it ships with a switching power supply that can deliver only about half of that wattage. (24v x 4A = 96W). Ah, marketing.With the amp issue sorted, I was still disappointed that the in-walls did not have bass that matched the small mini-77’s that we had listened to for 10 years. Given the larger drivers and volume of trapped air behind the in-walls, I was a little surprised. Research on the FOSI website was not able to tell me if the FOSI unit has a fixed High Pass Filter on the L-R outputs or not, so I was not sure if it was the speakers, or the amp limiting the bass. Everything below about 120Hz was absent.The Pyle amp, which has no amplified sub output, sounded similar in the bass, and a third full-range analog amp I connected in also played with little bass. Conclusion is that it’s the speakers or the install environment, most likely the speakers, as the two are separated by a lot of insulation, preventing any phase cancelling behind the wall.As a result, the stout little Dayton Audio 6-1/2" sub driver was ordered and installed with a ¾” split-baffle as support in the corner of the soffit for best loading. Once set up and adjusted, we now have a system with some decent extension into the 50-100 Hz range and more than enough volume to fill the kitchen area while providing a nice stereo listening field for most of the room. I wish we had the space for a larger sub driver, but with the framing behind the 12x12 soffit, an 8” or 10” just wasn’t going to fit. The 6-1/2” sub is respectable but it’s being driven rather hard to make up for it’s lack of piston area. A second identical unit is being considered, to double the cone area and increase the efficiency, but at least for the moment it sounds nice at reasonable levels. (EDIT: a second identical sub went in, same baffle approach, as close as I could get it to the first, which helped a lot - a little more cone area to grab air - and they are not being driven so hard. The system as of March 2023 is still going strong and used daily - DSB)On balance, the FOSI amp has been very good and well-behaved. It runs a little warm, but for its size it’s punching well above its weight and the BT implementation sounds quite good. It must have a decent SBC buffer scheme, as we don’t experience any buffer under-run drop-outs over long term listening with any of the apple, android or Chromebooks attached. Bluetooth range has also been solid throughout the area. This is probably due to the external no-compromise BT antenna. The amp is small enough not to notice on top of the fridge, and looks pretty smart. I’d buy it again. I will be posting this same review on the Sub and In-Wall speakers pages as well, because it's kind of a system-level review of all the bits and pieces.
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Top reviews from the United States

Reviewed in the United States on June 10, 2021
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5.0 out of 5 stars Works really well, power supply could be better. Part of a whole Amazon-sourced solution.
Reviewed in the United States on June 10, 2021
Music is a huge and daily part of our lives. Because we don’t like to overdrive the living-room system just to also “light up” the kitchen area with sound, I’ve kept a small (homebrew) 18+18W amplifier and Minimus 77 speakers on top of our fridge for years. It was linked to the living-room system via a stereo audio isolation transformer, and a Bluetooth receiver with an audio switch. Unsightly, but it worked well and sounded nice. With a recent remodeling of the kitchen and living-room areas, a better-looking solution was required. With a 12x12 soffit running in an “L” shape above all of the kitchen cabinets, in-wall speakers were the obvious choice. We ordered a set of Dayton Audio ME625W in-wall 2-way units and as I will get into later, eventually added a Dayton Audio DCS165 subwoofer and quasi-matching grille, all via Amazon. (The Pyle and FOSI amplifiers mentioned here were also Amazon purchases.)
My first choice for a new small amp to power this was the Pyle PFA540BT unit with built-in FM radio and Bluetooth features. That unit was bought as an open box from Amazon. While plenty loud, it had a subtle but definite grating midrange distortion once warmed up that I did not notice until it was outside of the return window. My bad, these new parts all sat around while we finished the other renovations. We all agreed it was annoying, even my kids. Additionally, the switch-mode power supply for that amp was so noisy (RF-wise) that the radio receiver only would pull in one station, with a local antenna from only a couple of miles away. The rest of the band was utterly swamped out. (No FCC cert logo visible on the PSU, now we know why).
My second amp was a FOSI audio unit, the BT30D, which is much better. No radio, but BT and line in. As a plus, it’s a 2.1 system with a dedicated drive channel for a passive sub. It’s rated at 50+50+100w. It’s plenty loud, however be aware it ships with a switching power supply that can deliver only about half of that wattage. (24v x 4A = 96W). Ah, marketing.
With the amp issue sorted, I was still disappointed that the in-walls did not have bass that matched the small mini-77’s that we had listened to for 10 years. Given the larger drivers and volume of trapped air behind the in-walls, I was a little surprised. Research on the FOSI website was not able to tell me if the FOSI unit has a fixed High Pass Filter on the L-R outputs or not, so I was not sure if it was the speakers, or the amp limiting the bass. Everything below about 120Hz was absent.
The Pyle amp, which has no amplified sub output, sounded similar in the bass, and a third full-range analog amp I connected in also played with little bass. Conclusion is that it’s the speakers or the install environment, most likely the speakers, as the two are separated by a lot of insulation, preventing any phase cancelling behind the wall.

As a result, the stout little Dayton Audio 6-1/2" sub driver was ordered and installed with a ¾” split-baffle as support in the corner of the soffit for best loading. Once set up and adjusted, we now have a system with some decent extension into the 50-100 Hz range and more than enough volume to fill the kitchen area while providing a nice stereo listening field for most of the room. I wish we had the space for a larger sub driver, but with the framing behind the 12x12 soffit, an 8” or 10” just wasn’t going to fit. The 6-1/2” sub is respectable but it’s being driven rather hard to make up for it’s lack of piston area. A second identical unit is being considered, to double the cone area and increase the efficiency, but at least for the moment it sounds nice at reasonable levels.

(EDIT: a second identical sub went in, same baffle approach, as close as I could get it to the first, which helped a lot - a little more cone area to grab air - and they are not being driven so hard. The system as of March 2023 is still going strong and used daily - DSB)

On balance, the FOSI amp has been very good and well-behaved. It runs a little warm, but for its size it’s punching well above its weight and the BT implementation sounds quite good. It must have a decent SBC buffer scheme, as we don’t experience any buffer under-run drop-outs over long term listening with any of the apple, android or Chromebooks attached. Bluetooth range has also been solid throughout the area. This is probably due to the external no-compromise BT antenna. The amp is small enough not to notice on top of the fridge, and looks pretty smart. I’d buy it again. I will be posting this same review on the Sub and In-Wall speakers pages as well, because it's kind of a system-level review of all the bits and pieces.
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25 people found this helpful
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Reviewed in the United States on February 14, 2023
10 people found this helpful
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Reviewed in the United States on February 19, 2024
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5.0 out of 5 stars Excellent for an Alexa-based bedroom system
Reviewed in the United States on February 19, 2024
I bought this to connect the AUX audio output of my Echo device (find an older generation, Amazon foolishly opted to remove the output on newer models). I like BIG sound, so I have large, floor-standing speakers and a small subwoofer in the bedroom, and this thing has a subwoofer output! That’s rare AND awesome! Just run a 1/8” headphone jack to stereo RCA adapter out of the Echo and into this, and you have a great sounding system no ‘normal’ device can touch.

It easily drives large speakers to comfortable volume without distortion or clipping.

It’s the perfect size to power a small room audio system, and sounds great doing it. It’s small enough to sit unobtrusively by the bed, so within easy reach and no remote required. Also, if you run an Echo through it, Alexa can control the volume through voice commands.

It’s a great deal and a great product.
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2 people found this helpful
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Reviewed in the United States on January 16, 2024

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JARI
5.0 out of 5 stars Ótimas opções de Conectividade Bluetooth, RCA , SubWoofer Passivo e Ativo e Alto Falantes Falantes.
Reviewed in Brazil on December 16, 2023
DC
5.0 out of 5 stars Excellent audio quality, amazing performance ratio for such small package, revived my old z2300.
Reviewed in Canada on November 1, 2022
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DC
5.0 out of 5 stars Excellent audio quality, amazing performance ratio for such small package, revived my old z2300.
Reviewed in Canada on November 1, 2022
Context:

My old 2005 Logitech z-2300 developed a hum noise, instead of trying to fix it I decided to go with a dedicated mini-amp to power the sub and the satellites thus giving the z2300 another life (amazing 8" sub on it). Did a couple research and found this Fosi Audio BT30D fits perfectly my needs. 2 channels with a passive subwoofer output, sub volume and crossover control.

Unboxing impression:

Package was well made, with sealed temper proof sticker. Inside the box there's a 24Vdc 4.5A power adapter, the mini amplifier itself, BT antenna, and user manual.

Wiring and configuration:

Speaker terminals can use banana plugs, in my case I simply use the binding post screws for all speakers.
I will be mostly using RCA input. So I left BT antenna detached.

All the dials are smooth to turn, no clicks when turning.

Audio quality:

You cannot go wrong with TPA3116D2 chips inside this amp, the sound is much cleaner than my old z-2300. I set my sub volume, treble and bass all 12 o'clock, sub frequency adjustment seems less sensitive until you turn past 3oclock, it would be better if there's a frequency indication on the dial. I set mine at 4oclock position.

I compared the BT audio quality versus the RCA input. I prefer much more the RCA input, from my PC audio out jack (Higher bitrate 192khz 24bit and sampling). The BT have 16bit 44100hz sampling rate.

The sound stage is amazing for such small form factor, you really have to listen yourself to really enjoy the performance.

Another thing about BT, it stays on all the time even you use RCA input, it got ton of range and your neighbors can connect it without your consent. You can take off the antenna if you don't use BT.

The good:

- Audio quality & fidelity (RCA input)
- Price / performance ratio
- Compact size
- High efficiency, it stays cool to touch
- Excellent build quality, rigid metal casing.

Needs improve:

- Sub freq adjustment needs marking on the dial to indicate the frequency setting
- BT audio doesn't sound as good as RCA input in my case (iphone)
- Have a way to turn BT off so no one can hijack your audio system.

It seems Fosi released a new model: BT30D Pro not yet available on amazon yet. So far I am really happy with this current model. If I need more power, I'd definitely upgrade to the Pro version.
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3 people found this helpful
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Jorge Martínez M.
5.0 out of 5 stars Excelente
Reviewed in Mexico on July 30, 2022
Super
5.0 out of 5 stars Super
Reviewed in India on March 22, 2024
elvijs
5.0 out of 5 stars Good
Reviewed in the United Kingdom on February 17, 2024
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elvijs
5.0 out of 5 stars Good
Reviewed in the United Kingdom on February 17, 2024
Very good and small amp. High quality sound
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