I've tried most mini class D amps (including the Fosi BT20a) and this is the best. I received it the same day I ordered it and it comes in a plain box with foam protection. It has a 3 knob EQ to really fine tune the sound and it sounds phenomenal. This amp is bigger, probably a little more than your standard bible. The blue tooth connects quickly and I'm stuck in no time. I had no distortion at full volume, but after a while with its performance, circuit protection kicked in on one of my 325-watt Bic America towers at full volume. I'm a Basshound and this one delivers the goods. I would have ordered a second one, but my Mini ZK1002T gives me a head start for my buck if I run into problems later. I use this as a normal old school sound system with two loudspeakers and a Bic Formula F-12 active subwoofer connected in parallel. Now I'm a bit frustrated as my quest for great sound on my budget is over. These amps are like little inexpensive gifts and fun when they come around to try out. I completely replaced my old Pioneer system and am very satisfied. I hope this review helps as there isn't much out there about this powerful little beast. Update: Had to return the unit as it was playing at medium volume on my left speaker. This amp is powerful, but on further listening the ZK1002T still sounded better and it needed a bit more volume control to get the same volume as this amp. This amp sounds great but doesn't seem to be able to roll off the mids even with its center pot. I like the sound with the EQ in a slight V shape, while the ZK has it without the EQ. I'm not an audiophile, but I like deep bass and crisp highs, and the cheapest big A amp delivers that.
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