S.M.S.L A50Pro,LPF&HPF,2.1 Channel Audio Amplifier,100W Bass Output Power, HiFi Bluetooth 5.0 Stereo Audio Amplifier,Supports HDMI (ARC),Passive Subwoofer,MA12070P*2 Chip

Hooked this up to a couple Logitech desktop tweeters and an old sub from an old surround sound system and I am blown away with volume and clarity of this little amp. Being able to also use blue tooth I can connect to my phone while cleaning and jam throughout my home which was a big surprise from some older speakers using a 2.1 setup. 5 stars all the way!

Exactly what I was looking for and I’m loving it so far. In fact, I even bought a second one.I don’t have space or particular desire for surround sound with my tv. It’s way more effort for marginal benefit. So years ago I bought a couple of pretty good bookshelf speakers, a subwoofer, and a big pioneer receiver. Eventually the receiver died and I didn’t want to buy another receiver with way more features than I needed.I specifically wanted hdmi input with ARC so I can just use my one TV remote to control volume. I also wanted it to handle a 2.1 setup.I was worried this SMSL amp wouldn’t work with my powered subwoofer, but it turns out it does still work if hooked up correctly. The subwoofer must have speaker-level inputs and then the subwoofer’s internal crossover filters the low frequencies. I tried it out and it sounds perfect.So I bought another for my other TV for basically the same reasons:- way cheaper than other receivers- sounds better than my previous, more expensive receiver- very small, well built, looks nice- has exactly the features I want (ARC)

The Infineon Merus MA12070 comes in 2 flavorsThe SMSL A50PRO has the digital input version of this chip(MA12070P)My other SMSL AO100 has the Analog input version (MA12070)The Low Level Detail from these Infineon Amps are amazingEven at very low (barely perceptible) playback levels, I can tell what song is being played and hear every wordPlayback from my older Amps (Late 1970's to 1990's) I often cannot even tell what song is playing at those same playback levelsSubwoofer channel's volume is a bit strange and looks like 500 - 599 volume levels when it is really S00 - S99Included Power Supply is rated at 24 Volts X 6.75 Amps, or 162 WattsPower Consumption is rated at 36 Watts and is VERY misleadingPower consumption is dependent upon the type of Speakers being usedThe internal amp died on my pair of klipsh promedia Ultra 2.0 computer speakers almost 15 years ago and the SMSL A50Pro never drew more than 3 Watts at any Volume Level with these speakersThese speakers are rated for 3 Ohm Impedence and have a DC resistance of 0-Ohms (Seriously)Pairing an extremely efficient pair of speakers such as these with an extremely efficient Amplifier like the A50Pro will draw between 2.4 and 2.8 Watts at any VolumeI tested the power draw with both the AC supply and a Killowatt Meter as well as with an Anker 537 Power Bank using a Chargerlab Power-Z Model C240 with the JacobsParts USB-C Type C Female Input to 5.5x2.5mm 20V DC Power Charge PD Trigger Adapter Cable on AmazonThis Amp will be used for Power Down Situation from a DC supply OnlyUsing this Amp Paired with my Sandy Bridge Laptop, I'm getting a Solid 5 hour runtime from just the Anker 537 Power Bank Alone (No Internal Laptop Battery)The Laptop Streams Audio from the Internet at 9 Watts in Linux or 10 Watts in Windows + 2.6 Watts Average for the SMSL AmpFor AC Power, I'll be using the AO100For Battery Power, these Infineon Merus Amps are unbeatable for the amount of sound quality you get at these power levelsAWESOME!12 thumbs up!

The amplifier came in plug-and-play. Good sound and plenty of power for listening to classical music on my 3-way bookshelf speakers. At about 5 inches wide, it is compact and aesthetically pleasing to the eyes, much more so than my bulky old Onkyo receiver, may it rest in peace. Can’t beat the performance at that price range.I connected it to an old Samsung phone via an optical cable and an USB C-2-optical adapter, and through the phone to a Synology NAS running my music database. Now I can play all my music via a Synology App called DS Audio.

HMDI input and Subwoofer output does not work. Returned.

Subwoofer output is weak even with sub volume turned all the way up. Wasn't a phase issue. Chose another 2.1 amp and don't have the same problem.

Great functionality, build quality and compact size. Powers my bookshelf speakers and passive subwoofer really well. Very happy with it. ‘Dropped’ down from an amp much more expensive and I’ve enjoyed the warmer sound signature more than the higher end amp. This is more fun and engaging rather than analytical, great for my office setup.

Works/Sounds great with a couple quality speakers. Bought this as a set-and-forget amp for a TV. Using the eArc HDMI input, the volume is controlled by the TV remote, so you don't need to add another remote to your collection just for this device. Downgraded to 4 stars for this one issue: changing the main volume doesn't change the subwoofer output volume, so you can't completely mute the amp without adjusting the subwoofer on the amp. I can live with it this way (but my wife complains she can't mute the TV).