Donner DKA-20 Keyboard Amplifier 20 Watt Keyboard AMP with Aux in and Two Channels, Bass Guitar Amp, Piano Amplifier, Electronic Drum Speaker Support for Microphone Input

Purchased this amp for home practice and for use as a monitor at band practice. At home I can plug in my keyboard and there's a 1/8 jack input for my phone so I can practice along with the music. Volume adjustment knobs for all inputs help me perfectly balance it all out. Adding in my headphones makes for quiet play. Unplug the headphones and it comes through the speaker. It's smaller in size than I thought when It arrived and had doubts it would be loud enough at practice with the drums and other musicians amps but this beauty cranks. I did elevate it so it was at least chest height. Plugged my two 1/4 inch cable outputs from the keyboard into the two inputs for stereo sound. 3 adjusters for bass mid and high.. really helped it sound clear when cranking it up. 1/4 inch output worked plugged into the digital PA.. however I might have to get one of those boxes to transition from 1/4" to a 3 pin for older analog PA systems when gigging out. Overall 5 stars as it's portable, audible, versatile, and lightweight!

I'm using it for my Roland keyboard as a dedicated speaker /amp. to my set up. Considering it's for a living room set, I'm very happy with it.

goo value for the money, great sound, quality cables and well made. thanks

Really surprised me with the sound quality

Very nice amp for my keyboard. I don't have a lot of experience with amps but this one sure sounds pretty good. The eq adjustments have plenty of adjustability for my needs. More then enough power for my keyboard too.

My Kawai ES 100 digital 88-key piano has a beautiful sound that was not captured by its integrated speakers. So, on a lark, I bought this Donner kit to pair with it. I love that the Donner box included everything I needed (no reason to buy another cable): the two-piece power cable, and a 1/4 inch amplifier cable with L-shaped end that plugs into the Mono L output on the left hand back of my ES100. Pop the other end in the little amp and we are off. If you have this exact keyboard, you can turn off the internal speakers by holding down the Function key and hitting C# 7 black key (page 45 of the keyboard manual).This amplifier is CLEAN. That's really key as I can place it 5 feet from my keyboard and there is no feedback and no annoying buzz when I'm not playing. It's just quiet. The volume power is better than the keyboard's internal speakers, matching it at about 60% volume amp to 100% on keyboard internal speakers, if that helps. Frankly, if I was playing to a church group in a middle- to large-sized church, or over other instruments, I would want 35-50 watt amplifier. But for household, small gatherings, this is great. Unlike my internal ES100 speakers, I can modulate the treble, midrange, and bass, which is nice. I can add a second instrument with line 2 in. And it has a 1/4 inch headphone out jack that is better placed for me as this sits aside my keyboard, than the headphone jack in the rear of the piano itself. So, all in all, this Donner 20 watt amp offers many sound improvements and conveniences that are worth the modest price. The only time I don't practice with this amplifier turned "on" now is when everyone else in my house is sleeping (then I use the ES100 internal speakers set low or the headphones). I recommend this amplifier for a home setting.

terrible buzzing sound regardless of plugged directly into keyboards or ran through a PA. waste of money. really tried to make it work.

I normally do not post reviews when I return something but in this case I thought it was worth doing so as others may be just on the fence about this amp as I was. Bottom-line, if you don't care about noises on the background, this amp sounds good. But if you want quality of sound, go elsewhere.Let's get deeper on the analysis. I got the amp this weekend and got super excited about it. It's smaller than I thought and in my opinion it looks great. Packaging was nice and I was happy to see it came with an audio cable so it's really plug and play for most people.But then, I got my first disappointment: it uses an external power supply. It would be A LOT more convenient and practical to have it inside - and I cannot see how that would impact its size. Anyway, not a big deal - I simply wasn't expecting it and it was a turn off, but all good.I connected the amp to the power outlet, raised the volume and was impressed as there was no noise whatsoever. But finally the moment came. I turned the power off again, connected the provided cable to one of my keyboards and turned it all back on. As I started to raise the voice, a "waving buzz" started playing on the background - very annoying. Still, I played a few notes and changed some settings (treble, bass, etc) and the sound quality was really good for an amp like that. So I thought to myself: it HAS to be the cable, so I decided do some testing here.I got 3 different cables from my "arsenal" and tried one by one. With my best (and expensive cable) the background noise got a little better but it was still noticeable. I have 2 other keyboards so I also tried them. No difference. No matter what I did, the buzz sound would NOT go away. And the louder I had the volume, the more noticeable it would become. Yes, I tried both input jacks as well just in case. While I was playing it was obviously not as noticeable, but nobody plays ALL the time, right? Also, you want an amp that gives you quality of sound - mainly when you have 3 expensive keyboards.Lastly, before giving up completely, I tried plugging one my bass guitars to see if it would sound better. And it actually did. The background sound went from the oscillating/waving buzz to the typical distortion static when you're using a guitar with an overdrive pedal - which was NOT the case. I was simply trying my Fender Jazz Bass on it.I have to be honest - I only tried this because of the price as all other Keyboard amps were a lot more expensive. And it seems now I know why. It's a shame because the amp is not bad. I am not an expert on electronics, but I really believe adding some filter on the input jacks could have made a difference here. I would not bother if it would make SOME noise as all amps do - mainly with string instruments. But with a digital keyboard this is kinda unacceptable. Long story short, returning this baby to Amazon.I will give it a 3-star rating because it looks great and if it wasn't for the background noise, it would have been perfect for my needs. But it's definitely not the case with lots of noise.