---
product_id: 449234251
title: "Fosi Audio Bluetooth Subwoofer Amplifier 2.1, BT30D Pro Subwoofer Amp with TPA3255 Chips 165W x2+350W & Bass Treble Control, 2.1 Channel Sub Amplifier for Desktop/Outdoor/Bookshelf Speakers"
brand: "fosi audio"
price: "31161 kr"
currency: ISK
in_stock: true
reviews_count: 8
category: "Fosi Audio"
url: https://www.desertcart.is/products/449234251-fosi-audio-bluetooth-subwoofer-amplifier-2-1-bt30d-pro-subwoofer
store_origin: IS
region: Iceland
---

# Bluetooth 5.0 with 15m stable range 165W x2 + 350W power output Precise bass & treble control knobs Fosi Audio Bluetooth Subwoofer Amplifier 2.1, BT30D Pro Subwoofer Amp with TPA3255 Chips 165W x2+350W & Bass Treble Control, 2.1 Channel Sub Amplifier for Desktop/Outdoor/Bookshelf Speakers

**Brand:** fosi audio
**Price:** 31161 kr
**Availability:** ✅ In Stock

## Summary

> 🎧 Big Sound, Small Package — Elevate Your Audio Game Now!

## Quick Answers

- **What is this?** Fosi Audio Bluetooth Subwoofer Amplifier 2.1, BT30D Pro Subwoofer Amp with TPA3255 Chips 165W x2+350W & Bass Treble Control, 2.1 Channel Sub Amplifier for Desktop/Outdoor/Bookshelf Speakers by fosi audio
- **How much does it cost?** 31161 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/449234251-fosi-audio-bluetooth-subwoofer-amplifier-2-1-bt30d-pro-subwoofer)

## Best For

- fosi audio enthusiasts

## Why This Product

- Trusted fosi audio brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact Yet Durable:** Sleek all-metal chassis combines premium build quality with a minimal footprint for any desktop or bookshelf.
- • **Powerhouse Performance:** Unleash crystal-clear sound with 165W x2 + 350W output powered by dual TPA3255 chips.
- • **Tailored Bass Experience:** Fine-tune your subwoofer frequency and volume for bass that fits your vibe perfectly.
- • **Seamless Wireless Freedom:** Bluetooth 5.0 ensures stable, drop-free audio streaming up to 15 meters—ideal for indoor and outdoor setups.
- • **Effortless Setup & Compatibility:** Supports 2.1 channel passive speakers and subwoofers, making your home theater or gaming rig sound next-level.

## Overview

The Fosi Audio BT30D Pro is a compact 2.1 channel subwoofer amplifier delivering a powerful 165W x2 + 350W output via advanced TPA3255 Class-D chips. Featuring Bluetooth 5.0 for stable wireless streaming up to 15 meters, it offers precise bass and treble controls to customize your sound. Its durable all-metal design fits seamlessly into desktop, bookshelf, or outdoor audio setups, making it a top choice for audiophiles seeking premium sound quality with easy integration.

## Description

Buy Fosi Audio Bluetooth Subwoofer Amplifier 2.1, BT30D Pro Subwoofer Amp with TPA3255 Chips 165W x2+350W & Bass Treble Control, 2.1 Channel Sub Amplifier for Desktop/Outdoor/Bookshelf Speakers: Amplifiers - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Big Sound for Small Price! - This amp is perfect for my listening habits. Plenty of power, nice clean signals, interfaces easily to my powered subwoofer. Plenty loud! Its footprint is so tiny, its amazing the sound it produces. And the price is less than $100. Would be great for a desktop sound system. Bluetooth is super easy and very strong. The unit cannot be controlled with a dedicated remote, which is sort of a downer, but if you're using Bluetooth predominantly -like me, your phone controls the sound, so no problem. You must supply your own cable for the subwoofer connection and for the speakers. Setup was a snap! If you have a small room for listening, this product will please you with a big sound for a small price.
Review: Good quality, sound, caveats - I am very happy with this purchase, to the point where the product deserves a review! Build quality and appearance are excellent, sound is very good, and the price is right. NOTE: you NEED BANANA PLUGS. The little plastic screw tightener on the speaker lug strips, at least if you try to tighten it enough to have a decent connection of any kind. They're pretty but not very functional. NOTE2: get short, insulated banana plugs, the kind with a non-metal outer shaft, because they otherwise might tilt and touch each other. (see picture) The TPA3255 chip does *not* have short circuit protection, so you need to be extra careful! [edit] You want banana plugs with an insulating shell, heat shrink tubing, or just some electrical tape. See picture. The desertcart basics and FosPower Deadbolt plugs are large enough to be almost touching, and although the shells are anodized, they're still metal. Anyway, you have been warned; just don't short out the connections! :) Application: I am using it with a pawn shop sub and a pair of old Radio Shack Optimus diecast aluminum speakers (the last descendant of the old Minimus speakers, basically they sound great but have zero bass). The sub is 4 ohms and supposedly handles 200W RMS (dual-6" speakers, really?) and the Optimus speakers nicely handle 50W RMS (8 ohms) but only if it's all midrange and treble. It's a bedroom stereo, so it's primary goal is to sound good quiet, but I do sometimes need to wake up. And I like bass. :D I bought the bundle with the 48v5A power supply, which because I have 8 ohm speakers and like to play music loud sometimes. :D Math suggests that ideally (and nothing is ideal), the power supply can deliver 240W to the whole system, and have enough voltage to drive the (4 ohm) subs to no more than 140W and the (8 ohm) tops to about 70W (RMS). In practice it seems to deliver. It's basically a perfect match for the 50W tops, while the sub surprisingly handles all of the supplied power until the amp runs out of headroom. (The sub channel distorts gracefully.) I have not attached a scope to see what the *actual* power output is, but AFAICT power is limited by the power supply voltage and speakers, not the amp itself, which is consistent with modern digital power amps. The whole system sounds good: as good as those speakers have ever sounded. :) The treble and bass controls are unintrusive, neutral at center-ish settings, and work. I wish the treble had a little more boost and cut, but I'll take "unintrusive" over "more boost" any day. The subwoofer has plenty of gain, and the frequency control has a smooth rolloff-- I used it to tame the peak at the top of the sub's frequency range a little. The system distorts gracefully when pushed. I primarily use bluetooth. This and the old technology of the speakers appears to be the only limiting factors for tone. A good system, would buy again.

## Features

- 2.1 Channel Amplifier:The BT30D PRO integrated amplifier features two sets of passive speaker outputs and one set of passive subwoofer outputs, making it easy to set up a 2.1 home theater or other stereo HiFi audio systems.
- High Power with Exceptional Sound Quality:Equipped with two high-end Texas Instruments TPA3255 Class-D amplifier chips, the amplifier home audio delivers clear and pure sound without distortion or clipping, stably outputting up to 165W x 2 + 350W of power.
- Bass Beast:Whether you're a gamer, movie buff, or music lover, the subwoofer amplifier provides tight, smooth, and natural - sounding bass. It features two dedicated knobs for subwoofer control: the SUB FREQ knob allows precise frequency adjustment of passive subwoofers from 0 to 300 Hz, while the SUB VOL knob lets you set the desired volume level. This gives you full control over the bass output to suit your personal preferences and listening environment.
- Bluetooth 5.0 Connectivity:This Bluetooth amplifier maintains a stable connection and delivers clear audio over a range of up to 15 meters. This makes it perfect for enjoying your favorite tunes or audio content in outdoor areas such as your yard, terrace, or poolside, without worrying about signal drop - outs or interruptions.
- Exquisite Craftsmanship:This mini amplifier is meticulously crafted with a solid, all - metal body that ensures durability and longevity. The well - designed case, along with the high - quality controls and connectors, exudes a sense of premium build and attention to detail. The exquisite packaging further adds to the overall appeal and value of the bass amp.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09YNBHR73 |
| Best Sellers Rank | #7,322 in Electronics ( See Top 100 in Electronics ) #23 in Audio Component Amplifiers |
| Customer Reviews | 4.4 4.4 out of 5 stars (1,568) |
| Date First Available | May 26, 2022 |
| Item Weight | 1.5 pounds |
| Item model number | BT30D PRO |
| Language | English |
| Manufacturer | Fosi Audio |
| Product Dimensions | 6 x 5 x 1 inches |

## Product Details

- **Audio Output Mode:** Stereo
- **Brand:** Fosi Audio
- **Color:** Black
- **Compatible Devices:** Speaker
- **Connectivity Technology:** Bluetooth, RCA
- **Connector Type:** RCA
- **Controller Type:** Android
- **Item Weight:** 1.5 Pounds
- **Special Feature:** Built-In Bluetooth
- **Surround Sound Channel Configuration:** 2.1

## Images

![Fosi Audio Bluetooth Subwoofer Amplifier 2.1, BT30D Pro Subwoofer Amp with TPA3255 Chips 165W x2+350W & Bass Treble Control, 2.1 Channel Sub Amplifier for Desktop/Outdoor/Bookshelf Speakers - Image 1](https://m.media-amazon.com/images/I/51ai7X4dnLL.jpg)

## Questions & Answers

**Q: What is the subwoofer frequency crossed at?**
A: According to the Fosi site, the 'sub freq' knob does exactly what you would expect, acts as a variable crossover point control. ""...adjustable 40-300Hz cutoff frequency for subwoofer...  It doesn't say what the slope of the cutoff is.

**Q: Are they screw fasteners for the speaker wires?**
A: The unit has a set of combination binding pot/RCA connections. So it will accept bare wires or RCA connectors for your speakers.

**Q: has any one used this with a non powered sub, and did it sound OK ?**
A: William, I have this Fosi amp for a small patio sound system. I do have a sub speaker but it is powered and not passive. I am 100% satisfied with the sound of my system. The Bluetooth works great as well as the aux input. This however does not answer your question but I may give you something to consider. According to Fosi specs, the rated output is 50 watts + 50 watts + 100 watts. I deduce that to mean 50 watts for each left & right speaker and 100 watts for sub speaker. That should be a sufficient 2 to 1 ratio for output division. Fosi also states that the output can be increased with an option 8 amp power supply, but they don’t state exactly how much the output increases. Whether or not a passive sub speaker would “sound ok” has many other variables, ie: size of speaker, sensitivity of speaker, speaker material, type of enclosure that houses speaker, if the enclosure is ported and if the port is tuned properly, if speaker is front firing or down firing, acoustical environment, etc, etc. It is possible a passive mode that the sub speaker may not “sound” satisfactory but may not be the fault of the Fosi amp. I hope this was helpful.

**Q: I see in some reviews that there should be a bluetooth/rca switch on the back , but no switch exists on mine. how do i switch to bt and pair it?**
A: For the BT30D theres a power switch on the front.  When you turn it on it activates the Bluetooth, but uses the RCA jacks until you actually pair a device via Bluetooth.  Just unpair the Bluetooth if you want to use a turntable or DAC.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Big Sound for Small Price!
*by P***O on January 7, 2026*

This amp is perfect for my listening habits. Plenty of power, nice clean signals, interfaces easily to my powered subwoofer. Plenty loud! Its footprint is so tiny, its amazing the sound it produces. And the price is less than $100. Would be great for a desktop sound system. Bluetooth is super easy and very strong. The unit cannot be controlled with a dedicated remote, which is sort of a downer, but if you're using Bluetooth predominantly -like me, your phone controls the sound, so no problem. You must supply your own cable for the subwoofer connection and for the speakers. Setup was a snap! If you have a small room for listening, this product will please you with a big sound for a small price.

### ⭐⭐⭐⭐⭐ Good quality, sound, caveats
*by T***D on October 31, 2025*

I am very happy with this purchase, to the point where the product deserves a review! Build quality and appearance are excellent, sound is very good, and the price is right. NOTE: you NEED BANANA PLUGS. The little plastic screw tightener on the speaker lug strips, at least if you try to tighten it enough to have a decent connection of any kind. They're pretty but not very functional. NOTE2: get short, insulated banana plugs, the kind with a non-metal outer shaft, because they otherwise might tilt and touch each other. (see picture) The TPA3255 chip does *not* have short circuit protection, so you need to be extra careful! [edit] You want banana plugs with an insulating shell, heat shrink tubing, or just some electrical tape. See picture. The amazon basics and FosPower Deadbolt plugs are large enough to be almost touching, and although the shells are anodized, they're still metal. Anyway, you have been warned; just don't short out the connections! :) Application: I am using it with a pawn shop sub and a pair of old Radio Shack Optimus diecast aluminum speakers (the last descendant of the old Minimus speakers, basically they sound great but have zero bass). The sub is 4 ohms and supposedly handles 200W RMS (dual-6" speakers, really?) and the Optimus speakers nicely handle 50W RMS (8 ohms) but only if it's all midrange and treble. It's a bedroom stereo, so it's primary goal is to sound good quiet, but I do sometimes need to wake up. And I like bass. :D I bought the bundle with the 48v5A power supply, which because I have 8 ohm speakers and like to play music loud sometimes. :D Math suggests that ideally (and nothing is ideal), the power supply can deliver 240W to the whole system, and have enough voltage to drive the (4 ohm) subs to no more than 140W and the (8 ohm) tops to about 70W (RMS). In practice it seems to deliver. It's basically a perfect match for the 50W tops, while the sub surprisingly handles all of the supplied power until the amp runs out of headroom. (The sub channel distorts gracefully.) I have not attached a scope to see what the *actual* power output is, but AFAICT power is limited by the power supply voltage and speakers, not the amp itself, which is consistent with modern digital power amps. The whole system sounds good: as good as those speakers have ever sounded. :) The treble and bass controls are unintrusive, neutral at center-ish settings, and work. I wish the treble had a little more boost and cut, but I'll take "unintrusive" over "more boost" any day. The subwoofer has plenty of gain, and the frequency control has a smooth rolloff-- I used it to tame the peak at the top of the sub's frequency range a little. The system distorts gracefully when pushed. I primarily use bluetooth. This and the old technology of the speakers appears to be the only limiting factors for tone. A good system, would buy again.

### ⭐⭐⭐⭐⭐ Unbelievably Musical Amp, Just stunned By the Sound Quality!
*by A***Y on May 26, 2025*

So for people reading this thinking why the glowing review, let me tell you first what my main system is. My speakers are B&W Nautilus 804’s with Nautilus 800 HTM 1 center, 805 surrounds and SVS height speakers for Dolby Atmos powered by a Denon AVR-X4700H. This amp and speakers in no way compares nor could it. For my computer, I bought a Cambridge Soundworks package containing The BassCube 821 and the MC 105 speakers about 13+ years ago. The BassCube has a down firing 6.5” polypropylene woofer (4 ohm) in a sealed box that also contained the amplifier for the three speaker system. The MC 105 (8 ohm) has a 1” aluminum dome tweeter with a 3” midrange in a sealed cabinet. The system was similar in design and appearance to the Klipsch ProMedia 2.1. Unfortunately, my system finally failed after years of service leaving me searching for a suitable replacement for that particular location and purpose. What failed was the amplifier that powered all 3 speakers. The power supply filter caps failed taking out components down line – not worth fixing. I considered the Klipsch ProMedia 2.1 but the long wait time and some reviews mentioning early failures and sound issues made me hesitant. My next choice was the Edifier S350DB which is larger than the Klipsch and my Cambridge system and it too had it’s detractors and is $400. So, I tried the Fosi Audio Bluetooth Subwoofer Amplifier 2.1, BT30D Pro and was blown away by the sound. Connecting it to the MC 105’s was easy as I just needed good speaker cable with with banana plugs at one end for the amp and twisted wire for the speakers. The 6.5” subwoofer speaker I connected internally directly to the existing speaker terminals. I first removed the wires from the internal amp and used two of the four speaker terminals on the back to connect the woofer to the sub input on the Fosi. Then I put all the screws back into the back panel of the subwoofer to close it making a good air tight seal. Previously, the bass coming from the BassCube 821 when it worked was boomy at times and sloppy it wasn’t tight and certainly didn’t go deep. Now it feels tightly controlled, musical and it goes way deeper. It seems to have more synergy with the MC 105’s which also sound more musical to the point that I actually listen to music while working on the computer instead of watching TV. Your mileage may vary based on the speakers you use but at this price point for me at least it was worth the try and I am amazed/surprised at the audible results. The amp has just the right settings to tailor the sound to your speakers and preference. The separate Bass and Treble are mainly for the smaller speakers and have little effect on the subwoofer. For the sub you have SUB FREQ which sets the cutoff point from deep bass going clockwise on up and SUB VOL which together give the ability to tailor the sound to your liking. I bought a power strip that turns on the monitor and the amp when the computer powers up so I don’t have switch it on and off, the TrickleStar TS1104 7 Outlet APS, 1080 Joules, 3 ft Cord White sold on Amazon https://www.amazon.com/TrickleStar-TS1104-Outlet-1080-Joules/dp/B0B61ZCPK6. Now when I turn on the computer everything turns on by itself, the amp and the monitor. So if you have a dead Cambridge or Klipsch system and are handy with a soldering iron or if you have speakers you really like but their current amplification is not so great, give these a try, you might be pleasantly surprised. BTW, I have received nothing in return for this review. All the best: Art If you found the review helpful, give me a thumbs up - Thanks!

## Frequently Bought Together

- Fosi Audio Bluetooth Subwoofer Amplifier 2.1, BT30D Pro Subwoofer Amp with TPA3255 Chips 165W x2+350W & Bass Treble Control, 2.1 Channel Sub Amplifier for Desktop/Outdoor/Bookshelf Speakers
- Banana Plugs with Dual Set Screws,Black and Red Aluminum Shell,6 Pairs
- Amazon Basics Speaker Cable, Easy Assembly, 16-Gauge, Bronze, 100 ft

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*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-02-10*