K450Fx Ultratone

This amplifier goes beyond my expectations. I didn't pay a lot and so didn't expect a lot. But I got a lot. This little unit (approx. 1'6" X 1'6" X 10") packs a lot of power. I can run my electric drummer through it while at the same time use it for vocals. The reverb is flexible, the echo impressive, and the sound system is quality driven. Each channel can be tuned. If you are looking to blast out your neighbors or hit the big sound stages, forget it. But for a practice amp or for a studio style sound system it can't be beat. And they don't beat you up on the price.

It has worked as expected for the month I've owned it. No problems with it. The price was lower than Roland and other manufacturers. I like the multiple inputs and mini mixer, which lets me run a microphone and drum machine in. I get my effects from a separate Zoom box. So, I haven't used this amp's built-in effects much, other than reverb for my voice when I sing into the mic.

The sound is incredible on this amplifier. Nicely made, modern, big and heavy. I use it with my 2 Yamaha keyboards. A must for ant keyboard owner. I bought it to preserve my built-in keyboard speakers, and to really "hear" the subtleties of what my keyboard can do. It delivers! Loud enough too for small clubs or parties. I also use it with my BluRay player and flat screen. Puts you right inside the action! Get it!

The sound is nice, and the volume is good. However, after less than a year of monthly use, the speaker has electrically failed. During a gig, it just suddenly popped and there was no more sound but static, no matter what's plugged in or what the channels or master volume is at. As far as I know, there is no warranty. I would suggest buying something more reliable if you are a professional like myself.

An excellent deal for the itinerant musician. The EFx choices and Feedback controlsvare superb. The LED enhanced 5 Band equalizer, as well as the 3 Line input, CD (sing along) inputs and Subwoofer output make this one jam-packed great sounding portable "sound station" for any musician who plays for enjoyment or small venues. Highly recommended.

This amp is my first one ever, so I'm a bit inexperienced to really know how this fares with others, but so far I'm pretty happy with how this amp has performed. It can get pretty dang loud and the effects it includes are cool to play around with. I've played keyboard and plugged in a microphone to this amp and both I'm happy with the results.Now my keyboard playing can be much louder and richer, though it seems the really low tones and bass reverb a bit too much, maybe that's just the effect I had on or I should have turned it down in the keyboard's settings. But overall I like this amp, it's cool to have and I'm sure I can compete with the volume of friends now that I have an amp rather rather than built-in keyboard speakers.

Holy crap, the sound quality is incredible. If you set it at an average, tolerable volume you can hear sound from down the street. I use it for solo piano gigs that are noisy, wouldn't have selected anything else. I don't have to annoy the people close by with blasting the music, but the folks in the back can still hear just fine. Love it

The K450FX arrived in two days. Box was a little ripped but no visible damage inside. Unit powered up just fine. I hooked it to my Yamaha MOXF8 synth keyboard and started playing. Very easy to set up. I set the voice to the grand piano and very quickly decided the sound quality was not to my liking. The tone quality was very muffled. The mid to upper bass was boomy and muddy sounding. playing a middle C on the keyboard was a muffled flat sound missing all its overtones. If I turned the equalizers top two of five sliders all the way up to +12db middle C sounded better but other spots in the scale just didn't sound right. Plugging the headphones into the unit sounded fine. My conclusion is the frequency response of the full range driver is just no where near flat. Very boomy upper bass and not enough treble. I have decided to send it back.