Update: have had this for almost 2.5 years and it’s still great and going strong.i bought this thing on a whim. was just looking for a small amplifier to drive some speakers in my bedroom. wanted something small that had a few inputs and a bluetooth connection and could drive speakers to a decent volume and sound ok for bedroom listening. i'll start by saying my main living room rig is a mcintosh c28 preamp, mcintosh 2205 amp and proac studio 100 speakers playing back from an mcintosh cd player, a vpi turntable and a mac mini server with a schiit audio DAC. my office system is an acurus cd changer, acurus preamp, acurus 250 amp and rogers ls3/5a speakers. i like good audio. i've owned all sorts of high end audio rigs at home and at my recording studios. i was honestly blown away when i hooked up this dayton audio amp to a few sets of bookshelf sized speakers. this thing sounds fantastic. clean, powerful, great imaging, nice depth, top end is smooth thanks to the tube preamp section, and has plenty of power to drive all of my speakers to great volume...more than i'd ever need. i have hooked it up to my old favorite pair of tannoy pbm5 studio monitors, a pair of hafler monitors, my rogers ls3/5a, and currently...a set of my yamaha ns10 studio monitors which are known for being harsh with the wrong amp. with the dayton, the ns10's sound fantastic. truly. i'm actually thinking of buying another one of these just to drive my other pair of ns10's in my studio. it is that clean and yet warm sounding. the tubes round off the edgy high end of the ns10's tweeters. the mono subwoofer output is great too, i currently have it feeding a small powered yamaha sub to just round off the low end octave.this little rig in my bedroom sounds...frankly...amazing. ns10's and a powered sub and when listening to cd's, or streaming audio from amazon or itunes or spotify or even youtube from my phone...sounds amazing through this dayton amp. for less than 150 bucks, this is a no brainer.i'm probably going to get a few more of them, one for my studio ns10's that i use for an extra mixing reference, and maybe one to drive a set of b&w mini pods that i have out in my garage. being able to just hook up this little amp and send music from an iphone or ipad via blue tooth....is so convenient...and easy...and it sounds fantastic.if you are wondering about this thing...don't. just get it. it's that good. does it replace my mcintosh rig ? no. but it sounds so freaking good, i honestly would not be completely bummed if it was my main rig. it can get pretty loud, certainly enough to fill a decent sized room...and it sounds really nice for a digital amp. the two preamp tubes do add a bit of warmth to the signal, i may experiment with various tubes later, but the stock tubes sound fine. they don't distort or sound crunch, just sort of add a smoothness to the top end and a warmth and roundness to the bass.only things i can think of to maybe improve this thing would be a simple set of tone controls to make adjustments for various speakers. if i could add a touch of top end when i'm using my tannoys, or a bit less top end on the ns10's...that would be the only thing i could see to improve the overall tone and sound and presentation this amp provides.it's small, but mighty. looks pretty cool. the controls feel solid. the connectors are all quality and i've found nothing wrong with this thing at all. truly. it's that good.this weekend i am sending my mcintosh c28 in to get recapped, and i think i'm going to setup this dayton with my main proac speakers and listen to some vinyl and higher quality digital files to see how it performs next to an audiophile level system. i'll edit this review when i do with the results.for now i'll just say...for $140.00 this amp is absolutely incredible. truly.