S.M.S.L A50 PRO HiFi Power Amplifier, High/Low pass filter 2.1-Channel, Infineon’s MA12070P Chip, Bluetooth 5.0/USB/Optical/HDMI/AUX input Passive subwoofer with adjustable volume, with Remote Control
€90
Price: $89.99
(as of Sep 28, 2025 03:15:34 UTC – Details)
From the brand
Foshan ShuangMuSanLin technology Co., Ltd. founded in 2009 which located in Shenzhen, China. And our branch company VMV Technology (HK) Company Limited registered in HK in 2013.
Our company is specialized in the audio DAC, stereo headphone amplifier, power amplifier, and with own R＆D, manufacturing and marketing team.
Beyond the era, tributed to the classics
S.M.S.L HiFi Power Amplifier
A50 PRO HiFi Power Amplifier
PL200 MQA-CD Player
DL100 Audio DAC Amplifier
A200 Bluetooth 5.0 amplifier
Package Dimensions : 12.68 x 7.8 x 2.87 inches; 2.43 Pounds
Item model number : A50 PRO
Date First Available : April 10, 2023
Manufacturer : SMSL
ASIN : B0D1G7R489
Best Sellers Rank: #35,763 in Electronics (See Top 100 in Electronics) #181 in Audio Component Amplifiers
Customer Reviews: 3.9 3.9 out of 5 stars 189 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
Getting ten crossover frequency points adjustable for High-pass and low-pass each.Subwoofer’s volume can set it separetely,which perfectly can use well for different main speaker and passive subwoofer and build your real 2.1 speaker system.
Passive subwoofer with adjustable volume and high power: The A50 Pro provides 100 watts of passive bass output power. lt effortlessly handles various speakers and scenarios, allowing you to adjust the subwoofer volume from S00 to S99 as desired.
Multiple EQ presets：This digital amplifier features multiple EQ presets, allowing it to adapt to various music styles and provide a diverse listening experience. Additionally, it has bass and treble adjustments, with a customizable range of ±9 levels.
Higher versatility Supports multiple devices：USB-Cport supports driver-free use.HDMl (ARC) is compatible with most televisions and also equipped with optical input and AUXinput. it’s suitable for almost all audio connections.
12-month warranty, you can return the item or replace a new one if you have any problems.
Customers say
Customers find the amplifier delivers good sound quality, with one noting that noise becomes less noticeable as volume increases, and appreciate its build quality and volume control features. The Bluetooth connectivity receives positive feedback, with one customer mentioning quick and easy pairing, and they like its numerous inputs and TV setup capabilities. The functionality and power delivery receive mixed reviews – while some say it works great, others report issues with the remote not working, and one customer mentions it struggles to deliver enough power.
12 reviews for S.M.S.L A50 PRO HiFi Power Amplifier, High/Low pass filter 2.1-Channel, Infineon’s MA12070P Chip, Bluetooth 5.0/USB/Optical/HDMI/AUX input Passive subwoofer with adjustable volume, with Remote Control
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Mark –
Fun, affordable, subwoofer amp built in!
This is a fun little Amp! I set it up for Dad as a soundbar replacement and to use with a Bluetooth turntable. We had tried a cheaper BT amp with a remote, but the volume control was spotty and he didn’t like that. This one works fantastic, though. Setting up tone controls and navigating menus is a little clunky, but you don’t have to do that often.It sounds really good! I haven’t compared it to any of my higher end gear in an A-B comparison, but it holds its own with decent speakers. It has a multitude of digital inputs. Bluetooth connects quickly and easily. Remote works well. I like that it has a sub output with switchable and adjustable crossovers, both LPF and HPF so you can really dial it in. We’re not utilizing it right now, but I’m tempted to buy one just so I can play with it and a passive sub!The display, although small, is enough to clue you in to what you’re doing. It’s better than a lot of this type of amp that have no display at all.
Martin B. –
This is a win for tv speaker setup!
Good little amp. Bought to drive my bookshelves and small sub for my tv. Works with arc perfectly, and has plenty of inputs. Booth works easily and the eq, tone controls, and low/high pass filters are helpful for tuning! Provides plenty of power to my 6 ohm speakers and is crystal clear. Canât beleive how small it is! This is a win!Update – could not get my subwoofer to work as itâs not passive. Disappointing. Not sure why they chose to use speaker level inputs like that instead of just having an RCA sub out. Just be careful with what sub you use – mine doesnât have high level output so this amp wonât work out after all.
Fritzair –
S.M.S.L. RSOpro- great little 2.1 amp with optical
Very good amp. Has some nice features. Has a mild eq, bass, treble, subwoofer controls including high and low pass filters. The amp sounds very nice. Great features for the price. There are not many 2.1 amps with optical in this polished. Highly recommend for many systems. Currently using it with a small sub woofer and 4â main speakers and I am very much impressed with the sound and volume. How donât think you could do better at twice the price.
MT –
Not good
Wanted an HDMI min amp, not many have that… Bought 1st one, no inputs worked. Had to return and purchase 2nd. 2nd arrived, again no input worked except this one I was able to connect Bluetooth. Volume 1-100, had to go 100 to hear and even that was flat, not loud, no bass. Very poor quality amp. Not too mention if not using banana plugs, the holes for the screw posts are on sides, beey hard to get too. Sent it back as well. Not recommended
Michael –
Sinple stereo for a TV
Nice simple stereo with HDMI ARC input. CEC enables the amplifier volume to be controled by the TV’s own remote. It does not power the amplifier on or off, it stays on all the time. This lack of a feature is not very important since the amplifier runs vey cool, due to the Infineon chip. The case never even gets warm! Highly reccomended.
Matthew Richards –
Great Features, but Major Subwoofer Output Issues
I’ve been using the SMSL A50 Pro in my DIY soundbar build, and while thereâs a lot to like, thereâs also a major drawback that holds it back from being a full recommendation.The positives:HDMI ARC support is fantastic â it lets me control the amp and TV volume with a single remote.The customizable crossover settings are a great feature for integrating L/R speakers with a subwoofer.Sound quality on the L/R channels is clean, detailed, a bit harsh with my build but the EQ settings let me fix that.The Negatives:The subwoofer output is a major disappointment. Even with bass boost on and the subwoofer level maxed out, the A50 Pro struggles to deliver enough power. I designed my passive radiator subwoofer to reach full excursion at around 40W, but this amp can’t get it there â even after upgrading to a 220W aftermarket power supply.For comparison, my Fosi BT30D (also rated at 100W sub output) easily drives the same sub to full performance, showing that the limitation is clearly in the SMSLâs subwoofer amp design, not my speaker setup.Given that one-third of the ampâs purpose (the subwoofer channel) doesnât perform as advertised, Iâm giving it 3 stars.Itâs still a solid product for L/R duty with a powered subwoofer,but if you’re planning to drive a passive subwoofer, youâll likely be disappointed.
Tom Varghese –
Amazing Sound on a Budget – Beats Any Soundbar!
We were looking to improve the audio from the TV at my parents’ house, but wanted to do it on a budget. A full-fledged AV receiver was out of the question, so we aimed for a simple 2-channel system with ARC connectivity. This S.M.S.L A50 PRO HiFi Power Amplifier turned out to be the perfect solution!Combined with a pair of bookshelf speakers from Costco (just $99!), and this amplifier (around $90), we created a system that blows away any TV’s built-in speakers. Honestly, this setup is cheaper and sounds significantly better than most soundbars on the market.The ARC connection works flawlessly. My parents can control the volume directly with their TV remote, so they never even have to touch the amplifier’s remote. It’s incredibly convenient.While the amplifier has other features like Bluetooth connectivity, my parents primarily use it with the TV. They essentially use the TV as a “poor man’s AV receiver” and the S.M.S.L. A50 PRO to power their Klipsch KD-50 speakers. This setup works beautifully. If you’re looking for a cost-effective way to drastically improve your TV audio, I highly recommend this amplifier. It delivers amazing sound quality without breaking the bank.
EMILIEN –
Vraiment parfait pour des Bass shakers !! à des années lumière du nobsound. à tous les simracers je vous le conseille 1000 fois!
Konrad –
KupiÅem ten wzmacniacz ponieważ ma opcjÄ podÅÄ czenia pasywnego subwoofera. Niestety okazaÅo siÄ, że 100 watów mocy jakÄ siÄ chwali SMSL A50 Pro byÄ może jest dostÄpna, ale przy opornoÅci 2 Ohm, wiÄc podÅÄ czajÄ c 4 lub 8 Ohm subwoofer nie uzyskacie z niego prawie nic. Mój sub przy maksymalnej gÅoÅnoÅci wzmacniacza wydaje zaledwie cichy pomruk. Ze wzglÄdu na to bÄdÄ chyba zwracaÅ ten wzmacniacz.Kolejny minus to regulacja bass treble. Nie dziaÅa ona tak jak niezależna korekcja niskich i wysokich tonów, a raczej jako “wilk eq”, a wiÄc kiedy dodajemy treble – znika bas, kiedy dodajemy basu – znika góra. Najlepiej zostawiÄ te ustawienia na zero.PomijajÄ c wady sprzÄt brzmi caÅkiem dobrze i nie brakuje mu mocy we wspóÅpracy z gÅoÅnikami stereo.Plusem jest wejÅcie HDMI eArc do podÅÄ czenia TV. U mnie to dziaÅa.Gdyby nie niska moc wyjÅcia na subwoofer byÅby to bardzo dobry wzmacniacz w swojej klasie cenowej.
GM –
Una equipo de muy buena fidelidad y sonido. Notas claras y de excelente calidad. El de odificador que trae integrado es de muy buena calidad. Lo conecte a unas bocinas monitor de 8 ohms y las llena completamente. No llega a calentarse con muchas horas de trabajo. Lo recomiendo ampliamente. No es el primer amplificador que tengo y realmente me sorprendió.
Dimitri –
Zeer goede geluidskwaliteit via de optic in en de analoge ingang. Via bluetooth wel wat slechter.
luca pasolini –
Ho comprato questo amplificatore per collegare la mia Smart TV Panasonic alle casse che avevo della Mordaunt Short, ho dovuto utilizzare il collegamento Bluetooth perché il collegamento HDMI era un po’ disturbato (Non so se era l’uscita della TV Oppure l’ingresso nell’amplificatore): in Bluetooth devo dire che funziona perfettamente e il segnale è pulitissimo ! consiglio l’acquisto!!!