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The unit is very small and convenient. Build looks ok, nice big volume knob. The on off switch is very small. Good connetors at the back. I couldnt verfy the advertised power, but it works well for my needs (running 20W mono speaker at the moment).Good bluetooth connectivity.There are two cables in the box - the one i needed (3.5 mm audio) was faulty, so i needed to get another one which i bought seperateltly. Hence the 4 stars, othwrwise it would be 5.I hope that it runs long time, will update in a month or so.

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POTENTE

My very old all-in-one stereo system finally died with the CD player giving way. I salvaged the old small passive bookshelf speakers and found this item to drive them. I'm no audiophile, but enjoy my music.This teeny sized amplifier drives the old speakers just fine and with good sound. I've used it a) connecting to my laptop with both a 1/8" patch cable and with bluetooth, and b) connecting to my phone via bluetooth. In both cases the connections were trouble free. (Haven't yet tried the USB connection though.) I also like that the speaker wires can be connected either via the bare wires using screws, or via banana plugs. Both straightforward.If I have any criticism it would be that this lacks a way to mount to a surface -- so it just sort of floats around. So I'll probably find some double-sided tape to hold it in place.Overall I'm very satisfied that this tiny and inexpensive unit works do well.

Completely blown away by this little amp. It's unbelievable to see a tiny form factor amp deliver sound of a hifi big amp. I was able to setup in no time. Tested with my Wharfedale tower 6 ohm speakers.Sound is really lound and punchy. No humming, No hissing. Quick to connect to Bluetooth. Overall well pleased by the purchase. Truly hope this amp lasts long.

I wasn't expecting much for this tiny device. But I was surprised it could drive a pair of 100W speakers with just a 19V 4A laptop charger (I did not use the included power adapter), of course to just maybe half loudness. It fits perfectly for my office use where I need clarity for teleconferencing, music, at the near field and not at loud noise levels. I can not detect any hissing, static, or weird noises from my speakers from using this device, but I have not stress-tested it at max power yet. Music just sounds nice coming out of this setup, not any lesser than another setup I have using a Sonos Connect:Amp.

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Excelente producto, lo conecte a dos marcas diferentes de bocinas y sin problema las levanta (60W IEC-120W PEAK).

I have a very specific use case (whole house audio) but wow... I'm very impressed! Here's my take on how I'm using it...Whole House Audio Project:We build our house about 11 years ago and wired it for 12 zones of audio. I have 4-wire speaker cable and CAT-5e network cable running from a central location in the basement to a single gang box in each room. Then, from the gang box, I have speaker wires running to the ceiling locations.In the 11 years we've been here, we never pulled the trigger to purchase the "traditional" system (multi-channel amps, in wall controllers, speakers, etc.) We've been quoted well over $10,000 for all 12 zones in the past. Even a DIY solution online would run nearly $4,000 without the speakers (HTD Audio's Lync system with keypads.) That's just not worth it to me.Being a Google fan, I set out to build a system using Google's Chromecast Audio devices, amplifiers, and in-ceiling speakers. I ended up purchasing this Mo-gu F900 amp for each zone in the house and it's been working perfectly! I'm at about $139 per zone and absolutely loving it! I can stream to each zone (from Pandora, Spotify, Google Play Music, I Heart Radio, podcasts, etc.) and control it from an iOS device, Android device, computer, Google Home, etc. I can have different sources streaming to different zones or group any zones together. It's incredibly flexible and easy to use.Here's the setup (per zone): 1. Google Chromecast Audio ($35) 2. Mo-gu F900 Amplifier ($31.99) 3. 82C 8-Inch In-Ceiling Speakers ($35.98 each, $72/pair - Available here on Amazon)And here's the installation details: 1. Install the in-ceiling speakers. 2. At the gang box, connect the speaker wires running to the ceiling to the 4-wire speaker wires running to the basement 3. In the basement, connect the 4-wire speaker wires to the F900 (and plug in the F900 with the included power supply). 4. Also in the basement, connect the Chromecast Audio device to the 1/8" jack on the F900. Plug in and configure the Chromecast Audio. 5. Turn the F900 on and set the volume knob about half way up. You can use the Google Home app to adjust the final volume of course. 6. In Google Home, select the Chromecast Audio device and edit the settings. Make sure you name it to the room it's located in. Also, adjust the treble and bass settings. I put both up almost all the way. The F900 can handle the wide frequency range very well. (YMMV of course so set it to your taste!) 7. Also in Google Home, set up your groups (ie: Whole house, Downstairs, Bedrooms only, etc.) You can create as many groups as you like! 8. Using an iOS, Android, or Google Home device, cast a source to the room and enjoy!Pros of the F900: * Powerful - It's driving the 8" speakers a lot better than I thought it would. Even over a long distance (>60 ft). Just make sure you use the proper gauge speaker wire if you have long distances. * Clean - We're not talking audiophile quality here but I was pleasantly surprised on how good this amp sounds. * Simple - It's a "set it and forget it" device in my solution. I plan on keeping it on all the time and I'm not too worried about it!Cons of the F900: * Size - It's actually a lot smaller than I thought it would be. Not really a bad thing but it was surprising. * Build Quality - The build quality is actually very good but the front sticker was applied a bit askew. Not a big deal though. * Hiss - When there is no audio playing, there's a VERY SLIGHT hiss that you can hear at the speaker. I mean, VERY, VERY SLIGHT. (I only heard it when I was on the ladder putting on the speaker grills. I had to have my ear closer than 12 inches away just to hear it. I can't hear it at standing height.Well, that's it. My cheap whole house audio solution is complete and a lot more flexible than I could have expected. Grand total for all 12 zones was approximately $1,670 (not including the speaker wire). The real beauty is that you don't have to do all of your zones at once. You can build it out zone by zone. (That definitely helps when you have to get spousal approval!)Hope this review helps!