S.M.S.L A50 Pro Amplifier,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

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!

With SMSL, I've come toe expect a simple yet well built metal chassis and solid performance. I have used a couple of there DACS and now this amp. I won't list off the features, as you can read them for yourself. They are there and work. The power rating also seems pretty reasonable, but do keep in mind that the power supply can only provide a total of 162-ish amps. So the rating of 70x2 for the left and right and 100 for the sub are likely interdependently correct, the total output can't exceed what the power supply can provide. Good build, good power, good SMSL multi function knob. This is a great basic DAC/AMP combo for speakers. The passive sub output is nice albeit a bit old fashioned. Most subs are powered now, but I do appreciate it. Maybe passive subs will make a comeback!

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).

HMDI input and Subwoofer output does not work. Returned.

This beats my fosi audio amp by a bit and sounds better with my speakers. For under a hundred bucks you get pretty good value and performance. Would be nice if it was app compatible but that’s ok as the user interface isn’t so bad. Bluetooth range is pretty good and well as the sound quality. The added sub out port is very helpful and makes this a complete small form factor 2.1 system.