S.M.S.LSA300 HiFi Digital Amplifier, Infineon's MA12070 Chip Class D Power Amp, RCA USB Bluetooth 5.0 APTX Input, Multiple EQ Modes with Remote Control (Black)

For near-field listening with bookshelf speakers (Micca RB42 and others), this amplifier sounds every bit as good to me as my old Carver 500W per channel class A/B amplifier. It is dead silent when the audio program is silent, and has ample power to drive the RB42s as loud as I care to listen with absolutely no signs of stress. The sound is very clean and pure with no faults that I can detect through the speakers I've tried it with.The power consumption is very low. It draws less than 1.5 watts when idle. When listening at levels I consider comfortable, the power consumption only rises by a few tenths of a watt. To increase the consumption by even a watt or two, I have to crank the volume up to the point where it is louder than I generally enjoy. When the amplifier is switched off, its bundled power supply draws 0.6 watts. By comparison, my old class A/B amp draws about 25 watts when idle, and the power consumption rises by 10s of watts at normal listening levels, easily going into the 100s when moderately loud.Due to the low power consumption and high efficiency of the SA300, neither the amplifier nor the power supply get noticeably warmer than ambient even when listening for a long time at levels I consider "loud". The enclosure has no ventilation holes, thus there is virtually no risk of dust or other contaminants getting inside. It appears to be very solidly built, and there is no reason to expect thermal stress or dust to shorten its life.One fault I found with this amplifier is that its bundled power supply uses a grounded cord and connects the electrical service's equipment ground to the analog audio input's ground. When using the analog input, this results in ground loop induced noise if the audio source is also grounded (for instance, an older style computer that uses a grounded power supply). For many applications, this won't matter, but it does limit the range of analog audio sources you can use without noise issues.Another minor fault for some applications is that the display is always lit, and cannot be shut off. It isn't too bright, but it would be for a room where I am sleeping or for a home theater if positioned where it is in view.There are many features I like about this amplifier. The speaker terminals are robust and can be comfortably screwed down on 14 gauge wire, and they also accept banana plugs. Bluetooth and USB audio sound great (no detectable flaws), as does the analog audio input when used with non-grounded sources. The bundled infrared remote takes two AAA batteries that are not included, so you don't end up with extra disposable batteries that you may not want. The amplifier itself is small and not too heavy (1.5 lbs), and the bundled power supply is even smaller, so it's fairly easy to pack it up and take it places. Bluetooth range, though I haven't tested its limits, is ample for my needs (at least to the furthest walls of my room). The display is functional and unobtrusive (nothing moving or flashing) and even lets you select different colors, but cannot be shut off. Volume is controlled in discrete steps (60 max) via either the remote or the knob which has detents corresponding to the steps. Pressing in on the knob accesses a menu via which tone controls, a few preset EQ modes, and other features can be accessed.The Bluetooth and USB audio inputs work perfectly with all sources I've tried including Ubuntu Linux. On Ubuntu 20.04.2 LTS, I had to install a sound output control application (named "Sound") to send audio output to the USB device, but the OS recognized the device right away with no need for additional drivers. The Bluetooth audio output from Ubuntu worked fine even before installing "Sound". The audio quality from Bluetooth and USB are equivalent (no differences that I could detect) when playing audio from Ubuntu Linux.Overall, I am very pleased with this amplifier. One minor improvement I can think of would be a floating power supply (so that grounded analog audio sources aren't affected by ground loop noise). Another improvement would be to allow the display to be shut off (for use in home theaters or rooms where people are sleeping). For what I am using this amplifier for (near-field listening at my computer desk, and occasional temporary setups in other rooms or out in the yard), it is perfect just the way it is.

Have not had the opportunity to run this for a long time. So I cannot comment on reliability.Bottom Line: This is the best sounding D amp out of the box out of many that I have acquired! Plenty of power. No need for upgrades and the EQ is great!Read the rest if you need more info:My D amp collection started with the old Lepai Tripath 2020 and it was solid and I used it for 10 years!. Bought 2 of them and gave one to my son. Also obtained a muse M20 amp and it still drives my computer speakers for the past 10 years as well. (A very good iteration of the 2020. I Decided to get a little more power some speakers for my TV and got a Kinter Tripath amp. But would not let me upgrade the power supply. It sounded just like my old Lepai which is still pretty good. I then changed out my speakers to my Boston Acoustic towers and needed more power so I bought an Aiyima. It is a very solid amp. Still love it, but found a great deal on a used Dayton Subwoofer that was too good to pass up, and now needed a 2.1 amp. The Aiyima now powers my Dayton bookshelf speakers for my computer. With the sub had to upgrade to a 2.1 amp so I got a Fosi. . That was OK but sounded a little thin (even with the sub) so I bought the Fosi tube Pre Amp (Highly recommend it!!) to fix that. The Fosi Pre-Amp/Amp Combo is sweet.Now wanted to upgrade the sound for my bedroom TV. The wife will throw the remote against the wall if there is more than one. I researched this one. Found out that the Fire TV remote will work with this (under sound bar choices for some reason) and set it up.Not using bluetooth or the DAC, but direct RCA lines from the TV to the amp. Sounds great. Played with the treble/bass in combo with the Super Bass EQ settings and with my kit built Dayton BR-1 speakers the sound is....spectacular!Making me think I might have to buy another one to replace the Fosi combo?.....If I can sneak it past my wife.UPDATE: It is till going strong and is driving my Dayton BR-1’s with wonderful depth. Played a few higher bit rate HD songs and it is hard to explain how good this is. And Yes! I did replace my Fosi pre/amp combo with a second one of these. . This amp does not need a tube pre amp because it sounds so good. The second is driving my living room TV with 2 Dayton Classic T65 towers and a Dayton 10” subwoofer. The towers are not the most efficient speakers, but this has plenty of punch to drive them very loud. No issues with distortion as it is very clean.My quest for a small D amp is over.Get this: You can get this amp and 2 Dayton tower speakers for a grand total $350!! Your ears and wallet will thank youUpdate 2; Still banging out beautiful music and makes my tv watching even more enjoyable.TIP: FIRE CUBE AND STICK USERS: I you wish to use your Fire remote to run the volume, you won’t find S.M.S.L in the amplifier section, it is in the SOUND BAR choices and it works fine. I love it as it is attached to my TV! .

Needed a compact and powerful enough amplifier to power up some Micca RB42 speakers and gave this a go. It performs flawlessly and provides more than enough power to the speakers without any audio issues. I was actually surprised how small it was. All the connections are nice and tight. Volume dial has smooth detents and menu is intuitive and easy to use. I also like that I can add a sub at a later time if I want. I’m not doing any special audio setups so this is perfect for my needs. Doesn’t heat up in my experience as well. Completely satisfied with it.