I bought this item roughly about two years time and I made the right decision., this amp/mixer have never failed me in times of need. I normally use this as PA system during parties like birthdays, during my wedding reception and other small venue events. Loud enough even when use outdoors. This is a multi-purpose amplifier/mixer with built-in effects like chorus, flange, reverb, delay, etc. I have tried using a Yamaha PSR 350 and tried using the effects especially reverb and it sounds brilliant. Also have experimented with flange and chorus and still I was impressed, made a difference to the PSR350. Also the mic inputs are excellent, three ¼-inch input with 1 shared XLR, all with independent volume and effects control. 5 band EQ with feedback detection button. 1 sub out, 1 line out, 1 RCA input for laptop/mp3 line in which I normally use during parties or for backing tracks.
This amp is also very good with acoustic guitar, however, not so convincing with electric guitars because I can’t help but compare it with Fender, Marshall, Peavey, Hohner amongst others that I’ve tried using and this Behringer K450FX is way below the line. Also the other thing, this amp is a bit heavy, manageable to carry but you can feel that there’s really weight which is an indication that the speaker is of good quality. So, if you’re looking for a portable PA system which is multipurpose and got a lot of mic/line inputs and sounds decent with some expansions like Sub Out and Line Out. This one is definitely the answer.
I bought this item roughly about two years time and I made the right decision., this amp/mixer have never failed me in times of need. I normally use this as PA system during parties like birthdays, during my wedding reception and other small venue events. Loud enough even when use outdoors. This is a multi-purpose amplifier/mixer with built-in effects like chorus, flange, reverb, delay, etc. I have tried using a Yamaha PSR 350 and tried using the effects especially reverb and it sounds brilliant. Also have experimented with flange and chorus and still I was impressed, made a difference to the PSR350. Also the mic inputs are excellent, three ¼-inch input with 1 shared XLR, all with independent volume and effects control. 5 band EQ with feedback detection button. 1 sub out, 1 line out, 1 RCA input for laptop/mp3 line in which I normally use during parties or for backing tracks. 
