Purchased to drive classic Bose Acoustimass AM5 cube speakers with subwoofer. This little amp packs a punch and delivers clean sound at every volume level with no distortion. It has a very nice cast aluminum case with matching Bass, Treble and Volume control knobs - good build quality overall. Primary audio source is iMac with 3.5mm audio jack. Easy to pair with Bluetooth too. Purchased in June 2020 however in Aug, the Left channel would intermittently cut out. Unit comes with 18 month warranty so I contacted Tech support. Note: Tech support is in China but was very responsive via email. After customary troubleshooting, it was determined to be a logic board issue. A new board was shipped out (free shipping, at manufacturer's cost) and received within 2 weeks. Replacement instructions were clear and simple - the unit is modular and easy to disassemble, just 4 screws in the front plate, pull out control knobs and board slides out, replaced board in about 5 mins, issue resolved! Hopefully the new board will last much, much longer and if not, I am confident that Fosi will stand by their products and certainly honor the warranty hence my rating of 5 stars - I believe it's a good product backed by equally good support and service!