Used this little class D amplifier for about 3 years.  It worked great with no issues.  The knob on the front is great and there is a little blue LED that shines though the edges of the knob when the unit is powered.  NOTE: This is a power amplifier and will work with passive speakers, but it will not work with active speakers.  The only input is RCA, so this unit does not have an internal DAC.  This amp has the TDA7492 chip which is the dual BTL class-D audio amplifier.

This listing comes with the following:
SMSL SA-50 Power Amplifier
Original SMSL Power Supply
Short RCA Cables (only useful if putting near source)

Here's a blurb about this amplifier:
  • Simple design and compact appearance, black color match makes it stable and not boring.
  • Real 2X50W stereo circuit design, strong output short circuit protection and thermal overload protection.
  • Parallel 6600 UF fever filter capacitance, meet the needs of the high power peaks.
  • Acoustic quality stereo sound, bring you noble hearing and make you immersive. (Please note:this amp cannot work with subwoofer)

Want A Simple Amp for Your Room?

Easy Setup & Simple Use

Feature

--All original parts manufacturing;

--Advanced oxidation process grain pull aluminum shell;

--Easy to install w/ manual, you can use it at your home or office.

--Delta OEM DC24V 4.5A (108W) power supply, over-current point 6A.

--The internal parallel the Philips 6600uf filter capacitor (reservoir) to meet the power needs of bursting, voice switching power supply side to solve delicate problems.