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

I bought the Fosi Audio BT30D Pro to power my barn sound system, running two Alpine 6.5" coaxial speakers along with a 12" JL Audio W0 subwoofer, and this amp completely exceeded my expectations. For the size and price, the performance is unbelievable. The sound quality is excellent — clean highs, strong mids, and surprisingly powerful bass output. It had no problem driving my speakers and subwoofer to levels that easily fill my entire barn while still sounding clear and controlled. The subwoofer controls are especially nice because they let you dial in the bass exactly how you want it. The Bluetooth performance has been flawless. Connection is fast and stable every time, with no annoying dropouts or pairing issues. I can walk around the barn with my phone and the audio stays connected perfectly. It honestly works better than many much more expensive receivers and amps I’ve owned. What impressed me most is how much power and sound quality Fosi packed into such a compact amp. It runs cool, feels well-built, and has been completely reliable in my setup. After using it, I genuinely feel this is one of the best values in audio equipment right now. If you want an affordable 2.1 amp with excellent sound quality, real output power, and rock-solid Bluetooth performance, the BT30D Pro is an easy recommendation. I turned my friend onto them and he wound up buying a second one because he liked it so much!

This FOSI amp is nothing but the truth folks! It has every bit of the power it claims to have... Only, you WILL NOT get that by purchasing this amp as a stand alone item!! To achieve the highest level of performance out of this awesome little jewel, one must also find and purchase an all together separate, and MUCH larger, 48v 10amp power brick/supply. I purchased mine right here on Amazon. There is another brand sold here on Amazon, which FOSI fans will likely be just as familiar with, and that is AYIMA... As it happens, AYIMA actually manufactures the exact power block/supply one will require, in order to bring this otherwise unremarkable amplifier right on out to front stage!! The power supply which is included with this amp, is actually nowhere close to powerful enough to get this amp pushing the wattage it is otherwise capable of producing! After having purchased the 48v 10amp AYIMA power block/supply though... Well, then I was able to connect my two 4 ohms bookshelf speakers, as well as my passive DIY subwoofer and enclosure (a custom sized, custom built ported enclosure, built to the exact manufacturers specs suggested by CT Sounds, for their 10 inch Bio-10 400w RMS dual voice coil subwoofer driver. I simply made sure to purchase the 2 ohms DVC version of the driver, so that I could wire the two voice coils together in series, before installing the driver into it's enclosure, and soldering it's leads to the inside tabs of the 5 way binding post cup I purchased for use on this passive, ported 10 inch subwoofer enclosure. Then I used some 12 AWG OFC speaker wire, with some solid banana plugs fastened to each end of it's length, to connect the enclosure's speaker connections up to the amplifier itself, and just like that, I've got my self a crazy powerful, yet still very compact 2.1 stereo audio system, that will knock the socks off of any other 2.1 system one might find for purchase at a walk-in retail store (like the Klipsch Pro Media 2.1 powered speaker system... Or even the Edifier 2.1 powered system available here on Amazon... BOTH of those powered systems come with a way hefty price tag! Certainly more than I paid for this little system I put together here! And neither of the two, as pricey as they may indeed be, could come anywhere even close, to being able to sound as great as this little system I managed to put together fort myself here! Not only does this amp provide the ability to select whichever speakers you may end up choosing to pair with it. But it also provides the ability to make use of any powered subwoofer enclosure you may already own. OR, if you have even the most basic of woodworking skills, then you could do the same as I chose to do, and fashion your own ported enclosure, which you can then select ANY subwoofer driver you could want, all the way up to 400w RMS. (You only have to be sure that, whether you purchase a 4ohms SVC model driver, or a 2ohms DVC model driver, that your end result, is a 4 ohm load being connected to the FOSI BT30D PRO amplifier! So long as you ensure a resistance of 4 ohms, then you'll be golden, and able to squeeze the max amount of power and efficiency out of this sweet little power house of an amplifier!

I’ve been using the Fosi Bluetooth Amplifier BT30D Pro 2.1 for several months in my garage, and it has completely transformed my music experience there. I run it with a pair of Polk Atrium5 speakers and a small 8” subwoofer, and it delivers impressive sound quality that fills the space beautifully. Compared to the previous version I owned, this one definitely provides more low-end impact, which was the main reason I upgraded. The bass is fuller, punchier, and makes listening to music while working in the garage much more enjoyable. The amplifier itself is compact, solidly built, and easy to integrate into my setup. The controls are straightforward, and I like that it allows separate adjustments for the subwoofer channel. That said, I’ve noticed that if I push the volume to the maximum, the subwoofer channel sometimes drops out and requires a quick reset. It’s a minor inconvenience, but it only happens at extreme volumes and is easy to fix. Bluetooth performance is solid, with clear, stable audio. My only small gripe is that the unit doesn’t automatically connect to a previously paired device. However, reconnecting takes only a few seconds, so it’s a very minor annoyance compared to the overall performance. The sound quality is excellent. The Polk Atrium5 speakers are crisp and detailed, and the 8” subwoofer adds the perfect punch to bring music to life. The overall balance between highs, mids, and bass is impressive, and the amplifier maintains clarity even at louder volumes. It’s made my garage feel like a proper personal music space, whether I’m working on projects, tinkering, or just relaxing. In summary, the BT30D Pro 2.1 is a fantastic choice for anyone looking to power a 2.1 system, especially if you want more bass and clean, full sound in a compact unit. The occasional subwoofer reset and manual Bluetooth connection are minor drawbacks, but they are far outweighed by the amplifier’s performance. I’m extremely happy with this purchase, and it has made my garage music setup much more enjoyable over the past few months.

EXTENSIVE testing trying to figure out "why" this great little amplifier didn't punch out the power. The subwoofer amp kept clicking off at higher volumes with the stock AC/DC 32v adapter. I ended up using a 12/24v to 36v step up booster and a 24v (10a) AC/DC adapter (Output is 36v, 10-amps). I tested the max current draw at full power - about 8.6 amps! The stock adapter is rated for 5 amps. Duh? That was the problem. This amp runs at 36v all day long...and a little warm. But, if you want full power and not having the subwoofer amplifier chip kicking off all the time -- either get a 32v (10-amp) adapter or even better 36v (10-amp) adapter. The good thing, a simple turn off/turn on resets the amp (subwoofer amp will reset). The Bluetooth 5.0 is phenomenal...excellent and fast connectivity. The fidelity and sound quality is totally quiet and pure. THD ratings are probably dead on accurate. It really plays beautifully all the way up to full power. The pre-amp out 3.5mm jack is a brilliant addition -- I tested it and it works like vintage equipment. Bluetooth connectivity is not affected. Linear with mains. If you ever wanted to add an active sub via this jack, you can -- it is full range. AUX input works -- no issues with low power pre-amp section like many other of these little digital chip amps. Bluetooth 5.0 is set HIGHER than expected -- NICE job Fosi! So many are set too low. Use banana connectors for your speaker wiring -- 4-8 ohm for mains, 4-ohms plays best. BOTTOM LINE - feed this little guy 36v and 10-amps of power and it is one helluva performer. It will deliver some nice subwoofer bass if your subs are decently efficient. PA sub cabs @ 4-ohms work best. Car subs are not that efficient (low SPL per watt). For those just wanting a lower volume 2.1 home AV system (like for watching TV or on a computer), no need to upgrade the included AC/DC adapter. For me, why by a Corvette and drive it like grocery getter Camry?

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.

Another glowing review here. I have owned a few chip amps and this one is in a class of its own. It simply checks most folks' desired feature boxes, and all of mine. FOSI really listened to users feedback over the last few years.... just a few items: No annoying lights, pops, clicks, messages, etc. Power on/off is silent. Bluetooth connects instantly and silently. I like the fact that it doesn't auto-reconnect. If you live in an apartment or other place adjacent to others, bluetooth security could be an issue, but that is likely rare. With the sub crossover and level controls, adjusting the sub/mains blend to your listening preference is easy. I purchased a 48V power supply and it made an audible difference, even to my old ears. With the potentially higher output is more heat, but this amp handles it well with the entire case being the heat sink. I used it for a while with moderate load on my Florida lanai in 90 degree plus heat, powering a set of Dayton passive 8-ohm 6.5" outdoor speakers with my beloved Peerless XLS 12" 8-ohm ported subwoofer and it didn't waver. Got very warm to the touch. Sound is clean and dynamic. I would like to see real world power and distortion tests on this unit, including the preamp out. What a little jewel of an amp. Perfect for the heart of a small bedroom, office, or other moderate 2.1 system. It just works and works well. Highly recommended.

This is exactly what I needed for my office. I had an old one I could repurpose, but it had a separate amp that has died. I didn't want to have to buy a new powered sub, and I didn't want to have to buy and run a separate sub map, nor did my 2 channel amp have a sub output. I've been a big fan of D-amps for a long time, so I thought this would be perfect. It's not perfect, but it does what I need. Plenty of power for desktop speakers and my old 10" NHT sub. I've read reviews where people were saying they couldn't get a good speaker/sub balance, but I've had no problem with that. A few comments in no particular order: - Bass/treble adjustment range is moderate, but I've had no trouble adjusting them to sound good. - I wish it had frequencies marked for the sub X-over point, but again no problem to set by ear. - I wish Bluetooth could be completely disabled. I agree with those that have complained about the lack of security. Basically anyone could attach to this, and it would switch to the BT input. There is no way to manually force RCA inputs. I didn't attach the antenna, but the BT signal still leaks out. - I would like to have user-selectable high-pass crossover for the main outputs to reduce the load on my bookshelf speakers. But it's not a deal breaker. The bottom line is that for the price and feature set, it's a great amp, even if not perfect, and it sounds really good to my ears. For anyone wondering about power consumption, here's what my kill-a-watt says: Off: 0 W Idle: 2 W Music playing: 5 W Music playing very loudly: 7 W

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!

Amazing Amp for a small stereo setup in our living area. It sounds great driving a pair of Q Acoustics 3090i bookshelf speakers and a small powered Focal sub. It's compact and unobtrusive. I thought I'd use the RCA jacks as a source with a ipod or old phone, but it's mostly driven via Bluetooth from an Amazon Echo. The Bluetooth connection is quick and stable with no drop-outs. One minor omission is a lack of a Toslink/optical input, but honestly that's a very minor thing, and Fosi do other units that have that if it's important to you. Would definitely recommend.

He comprado este amplificador Fosi BT 30 D, al ver las especificaciones. Voy a dar mi opinión sobre este modelo en concreto. Este aparato es un poco mas grande que otros modelos, y lo bueno es que trae una fuente de alimentación de 48 Voltios. viene bien empaquetado en una espuma de alta densidad que lo protege de cualquier golpe. Para conectarlo he usado cable de 2,5 mm con unas bananas marca VCELINK, los altavoces tienen una P. 100W, 8 Ohmios, y una (SPL)de 90, Marca Celestion. El subwoofer es un Yamaha activo. El amplificador me a sorprendido que para lo pequeño que es tiene mucha potencia, suena muy bien, y no distorsiona para nada, para regular el subwoofer lo tienes que hacer con el oído, hasta encontrar el equilibrio para no escuchar vibraciones. Se conecta al bluetooth, rapidísimo, lo he tenido por mas de 4 horas seguidas funcionando a una potencia alta y no distorsiona ni pierde potencia, y tampoco se calienta en exceso. He probado otro modelo Fosi BL20C, y el sonido es mas cálido, y como su otro hermano, muy potente. Espero que os sirva de algo mis reseñas, me parece un buen producto con un precio decente.

I was not expecting much when I ordered the Fosi Audio BT30D Pro, after all what could you expect for CAD $140.00? I purchased this as a Hail Mary pass to try to raise my Paradigm Millenia CT, Shift Series 2.1 computer speaker setup from the dead after it had given up the ghost due to a failed amp board. Paradigm customer service was unacceptable -“We no longer produce that amp board. Our best advice is for you to purchase a more current model from our product line”. I may be old school, but I expect speakers costing $750 to last a lifetime. ( I still have a Pioneer SX- 767 seventies era receiver that works perfectly) After some research, I decided that a solution might be to bypass the Paradigm expression of crap and use a separate Class D amp to drive the satellite speakers and sub. The result: in short, I was blown away by the sound quality that this Fosi amp delivered. The resultant sound far exceeded the original Paradigm amp board. More articulate highs, better sub performance and a wider, deeper soundstage than the Paradigm amp. In all fairness, the power output of the Fosi amp is more than triple that of the original Paradigm amp, but the improvement in sound quality makes me question whether Paradigm’s product was under powered, given the obvious capabilities of the speakers and sub powered by this Fosi amp. I highly recommend this amp. At this price I do not think you can go wrong. Note: I use this with my computer speakers to listen to digital music files, mostly in FLAC format, via a wired connection to my music server. If you use it to play MP3 or compressed, Apple format files over a Bluetooth input, your mileage may vary, and as noted in some of the reviews, gamers may not be satisfied with the sub output. So, in conclusion, the Fosi BT30D pro exceeded my expectations and I recommend it as excellent value for the money. Paradigm equipment – less so.

Öncelikle eksik yönlerinden bahsedeyim. Ses ayarları ortada olduğunda mekanik bir his vardır. Bakmadan ayarlayabilmeniz için, işte bu cihazda o yok. Bluetooth bağlantısını kapayamıyorsunuz ve şifreleme yok. Şakacı komşularınız varsa tek çözüm anteni çıkarmak. Kapatmak için bir switch olsa iyi olurdu. Analog ses girişi katı bluetooth'dan çok daha iyi ses çıkışına sahip. Balans Ayarı yok. Şimdi artılarına geçelim. Ses yüksekliği fazlasıyla yeterli, 2 adet pasif subwoofer besleyebiliyor. Bas ve siz sesleri de distorsiyonsuz veriyor. Bilgisayar ile kullanmak için ideal. Az yer kaplıyor çok ses veriyor. Daha da yüksek ses vermesini isterseniz daha yüksek amperli güç kaynağı kullanmanız lazım. Sesini sonuna kadar açsanız bile statik elektrik sesi duyulmuyor, uğultu yok hafif bir tıs sesi var yani yalıtımı iyi başarmışlar. Bas açtığınızda Subwoofer'lara giden ses değişmiyor. Subwoofer gain ve frekans ayarı düzgün çalışıyor. Pasif subwoofer kullanımı için çok ideal. Ayrı pre out ile başka amfilere veya cihazlara bağlayabilirsiniz.

Muito fácil de montar, bem acabado, todo em metal. O tamanho impressiona pelo som que dá. Liguei numas torres de 150W da Polkaudio e num subwoofer ativo Velodyne Impact 12”, através de cabo P2/RCA e me impressionei pelo som. Fácil de mexer, não precisa configurar. Som com muitos graves e agudos. Recomendo. Chegou 5 dias antes do previsto e bem embalado. Parabéns!