The complete guide
Choosing an 88 Key Digital Piano, A Practical Buyer's Guide
The problem with most keyboards
Plenty of people start piano on a small keyboard, get a few months in, then hit a wall. The notes run out. The keys feel like they are made of air. Pieces that should sound shaped and expressive come out flat, because the keyboard plays the same volume no matter how you touch it.
That wall is not a talent problem. It is a hardware problem. Piano technique is built on resistance, on the way a key pushes back and lets you control exactly how loud each note lands. Take that resistance away and you are learning a different instrument that happens to look similar.
An 88 key digital piano with weighted keys solves it. You get the full range, you get hammers behind the keys, and you get the quiet practice and low maintenance that make a digital instrument practical in a normal home.
How a weighted action works
Inside an acoustic piano, each key is a lever that throws a felt hammer at a string. The hammer has mass. You feel that mass every time you press a key, and your fingers learn to work with it.
A weighted digital piano copies that idea. The Kawai ES120 uses the Responsive Hammer Compact action, which puts a real hammer mechanism behind every key with no springs involved. Springs tend to make a key feel bouncy on the way back up. Removing them gives a steadier, more predictable return.
The hammers are also graded. Heavier ones sit at the bass end, lighter ones at the treble end, which is exactly how an acoustic instrument is weighted. In practice that means loud left-hand chords feel planted rather than skittish, and fast right-hand runs do not drag. Kawai has also added cushioning material in this action to cut down the mechanical knock that key beds can make, which matters more than you would think when you are playing at 11pm with headphones on and everyone else is asleep.
Sound, and why the source matters
A digital piano's tone comes from recordings of a real instrument. The quality of that source recording sets the ceiling for everything else.
The ES120 is built on the Shigeru Kawai SK-EX concert grand, an instrument with a strong reputation among concert pianists in Japan and beyond. You hear that in the bloom of a sustained chord and in how the tone changes as you play harder, rather than just getting louder.
Around it sit 24 more voices. Electric pianos for pop and jazz, strings for layering, organ, and so on. Dual mode stacks two of them together. Split mode gives each hand its own sound, which is handy for teaching or for playing bass lines with the left hand. There are 100 drum rhythms too, and practising to a groove instead of a bare click is a surprisingly effective way to tighten up your timing.
The on-board speakers are rated at 20W, enough for a room without needing an amp. Through headphones you get Spatial Headphone Sound, which spreads the stereo image so it feels less like the music is stuck between your ears.
Who this piano suits
Three groups tend to get the most out of an instrument like this.
Adult learners and returners, first. If you played as a kid and want back in, a weighted 88 note piano means you are not relearning touch later. The headphone output means practice fits around a household rather than fighting it. People shopping for the best digital piano for home usually arrive at this specification.
Students working toward exams, second. Graded syllabuses assume full range and dynamic control, and this instrument gives you both. The metronome and song recorder are genuinely useful here, because hearing your own playing back is how you find the bits you have been glossing over.
Gigging and semi-pro players, third. At 12 kg with dedicated left and right line outputs, this is a realistic stage instrument. A clean stereo feed into a mixer sounds far better than a microphone pointed at a speaker, and the weight means you are not dreading load-in. Anyone comparing the best gigging digital piano options will be weighing exactly those two things.
How to choose, practically
Start with space. The ES120 is 130.5 cm wide, 28 cm deep and 15 cm high. Measure the spot you have in mind, allow for the power cable at the back, and allow room for music or a tablet. Most 88 key instruments land near this width, so if it will not fit, no full-size piano will.
Then think about the stand. A stand is not listed in the included components for this model, so budget for one. A solid X-stand works if you move the piano often. A fixed furniture-style stand looks better and feels steadier if the piano lives in one room. Either way, pick one rated well above 12 kg so it does not flex when you play hard.
Next, the bench. Height matters more than people expect. You want your forearms roughly parallel with the floor and your wrists relaxed. An adjustable bench sorts this out for players of different sizes sharing one instrument.
Headphones are the last piece. Closed-back over-ear headphones with a 3.5 mm plug work straight into the jack and keep sound in. Cheap earbuds will undersell the instrument badly, so it is worth spending a little here.
Finally, check how you want to connect. Bluetooth MIDI handles wireless links to learning apps and recording software. Bluetooth audio streams backing tracks from your phone through the piano speakers. A standard USB-MIDI port covers wired connections to macOS or Windows, which some people prefer for recording because there is no pairing to think about. Kawai's PianoRemote app gives you a screen-based way to change settings rather than memorising button combinations.
Looking after it
Digital pianos are low maintenance, but a few habits keep one looking and feeling new.
Wipe the keys with a soft cloth that is dry or barely damp, then dry them immediately. Avoid solvents, alcohol wipes and furniture polish, since they can dull or craze key surfaces over time. Dust the cabinet the same way.
Position matters too. Keep the piano out of direct sunlight, away from radiators and heaters, and out of damp rooms. Electronics and damp air are a poor combination. If the instrument sits unused for a while, cover it, and unplug the adaptor during storms or when you are away for a long stretch.
Keep drinks off the top panel. It sounds obvious. It is also the single most common way a perfectly good instrument gets ruined.
The short version
The Kawai ES120 is a full 88 key digital piano with a fully weighted, graded hammer action, built around the Shigeru Kawai SK-EX concert grand sound plus 24 extra voices. It has Bluetooth audio and MIDI, USB-MIDI, a 20W speaker system, a 3.5 mm headphone jack with Spatial Headphone Sound, and stereo line outputs for stage use.
It is 130.5 cm wide and weighs 12 kg, comes in black with a lacquered or polished finish, ships with the F-1SP switch pedal and F-351 three-pedal accessory, and carries a 5 year warranty.
If you want an instrument that teaches proper technique, stays quiet when the house is asleep, and can still be carried out to a gig, this is the shape of piano to look at. Measure your space, add a stand and a decent pair of headphones, and you are set.