I've tried most of these mini class D amps (including the Fosi BT20a) and this one 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. Bluetooth 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: I had to return the unit because it worked on my left floorstanding speaker at medium volume. This amp is powerful, but upon 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 my sound with the V EQ small, but 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. I like my sound with small V EQ, but the ZK has it without EQ. I'm not a music lover but I like deep bass and crisp highs and the cheapest amp on Big A offers it. I like my sound with the V EQ small, but 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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