The Korg B2 is the surprise of this comparison: a 30 W speaker system that genuinely fills a room, packed into a sub-£400 piano alongside an even Natural Weighted Hammer action and USB audio out. At £379 it offers the most sound per pound here.
Korg is better known for synths and stage pianos than home digitals, but the B2 is a quietly clever piece of value engineering. It undercuts our £600 all-rounders by more than £200, yet it ships with a speaker system that embarrasses pianos costing far more. We spent six hours with it, and while it does not top our list, it makes a compelling case for anyone whose priority is the biggest, fullest sound for the least money.
| Model | Price | Keys | Key action | Sound engine | Rating | Link | |
|---|---|---|---|---|---|---|---|
 | ★ Top pick Korg B2 Digital Piano | £419.00 | 88, fully weighted | Natural Weighted Hammer Action (NH) | Stereo PCM, 120-note polyphony | ★ 4.2 | View → |
£419.00
88, fully weighted · Natural Weighted Hammer Action (NH) · Stereo PCM, 120-note polyphony
The verdict from Anaya Iyer, pianist and keyboard reviewer
The pick for the most sound per pound. The Korg B2 undercuts the £600 all-rounders yet ships with a 30 W speaker system that genuinely fills a room, plus a respectable Natural Weighted Hammer action and 120-note polyphony. The voice list is short and the action is slightly springier than a Yamaha, but if you want the biggest, fullest sound you can get for under £400, the B2 is the one to hear. It makes a fine main piano for a home practice room.
The speakers project with real body, and the keys settle into an even, predictable bounce.
| Keys | 88, fully weighted |
|---|---|
| Key action | Natural Weighted Hammer Action (NH) |
| Sound engine | Stereo PCM, 120-note polyphony |
| Speakers | 2 x 15 W (30 W total) |
| Voices | 12 |
| Bluetooth | No (USB-MIDI + audio) |
| Weight | 11.4 kg |
| Price | £379 |
| USB audio | Yes, record direct to computer |
| Cabinet depth | 33.6 cm |
The B2 suits the player who wants the most room-filling sound for under £400, and who values strong speakers and clean recording over a long voice list or wireless features. With 30 W of speaker power it comfortably outguns the 16 W Casio and the 14 W Yamaha in this comparison, despite costing less, and the USB audio output makes it a sensible budget choice for a home studio or content creator who wants to record without an extra interface. It is less suited to someone who wants the finest action, where the Yamaha and the pricier Kawai pull ahead, or the slimmest cabinet, where the Casio wins.
Best for: the home player who wants the biggest, fullest sound for the money and a simple way to record.
The Natural Weighted Hammer action gives the B2 a genuine 88-note weighted bed that is even and predictable across the keyboard. Through scales and a Schumann piece it stayed consistent, and it is a real, technique-building action rather than a semi-weighted compromise. Side by side with the Yamaha P-145, though, it feels a touch springier and less graded, returning to rest a little more eagerly. It is a perfectly good action for the price, comfortably better than the budget Alesis, just not quite as refined as the £400-plus Yamaha or the £600-plus pianos.
Korg's stereo PCM engine drives a grand voice sampled from a concert grand, and it is warm and pleasant if a step behind the modelled, multi-sampled grands of the Roland and Kawai. The 120-note polyphony is generous and easily handles pedalled, sustained passages without dropping notes. The voice list is short at 12, covering the essentials, two grand voices, electric pianos, organs and harpsichord, but the strength here was always going to be how that sound is projected rather than the breadth of the menu.
This is the B2's whole reason for being. The twin 15 W drivers give 30 W in total, the second most powerful system in our comparison behind only the £729 Kawai, and remarkable in a piano costing £379. In a living room of 20 m² or more it fills the space with body and warmth that the cheaper Yamaha and slim Casio simply cannot match, and it never sounds strained. If you want the fullest unamplified sound for the least money, the B2 is the one to hear.
The B2 has both USB-MIDI and, unusually at this price, a USB audio output, so you can record a clean stereo signal straight into a computer without an audio interface, which is genuinely useful for a budding producer or YouTuber. There is no Bluetooth, so app connection needs a cable. The cabinet is the deepest here at 33.6 cm and weighs 11.4 kg, solidly built if a little less polished than the Yamaha, and it sets up quickly with the included sustain pedal.
The B2's compromises are the price you pay for those speakers. The action, while genuinely weighted, is a fraction springier and less graded than the Yamaha's, so feel-focused players will prefer the latter. The voice list is short at 12, there is no Bluetooth, and the deeper 33.6 cm cabinet takes more space than the slim Casio. None of these undoes its core appeal, but they are why it is our best-speakers pick rather than our overall winner.
They are the highlight. The twin 15 W speakers give 30 W total, far more than you expect under £400 and enough to fill a practice room with body and warmth. Only the Roland (22 W) and Kawai (40 W), both pricier, beat it in our comparison for sound projection.
Yes. The B2 uses Korg's Natural Weighted Hammer action across all 88 keys. It is even and predictable, though a touch springier than the Yamaha graded action. It is a genuine weighted bed that builds proper technique, not a semi-weighted keyboard.
Yes. It has a USB audio output as well as USB-MIDI, so you can record a clean signal straight into a computer without an extra interface. That, plus the strong speakers, makes it a sensible budget choice for a home studio or content creator.
Choose the Korg for much louder speakers and USB audio out; choose the Yamaha P-145 if you prefer a slightly more refined graded action and the CFX grand voice for pure practice. The Korg is the better-sounding instrument in a room, while the Yamaha edges it on key feel.
The Korg B2 wins our award for the best speakers under £400 because no other piano near the price projects this much sound, and the USB audio out is a thoughtful bonus for anyone who wants to record. At £379 it is the most sound per pound here and makes a fine main piano for a home practice room. If your priority is the finest key feel rather than volume, the Yamaha P-145 is the better buy at this budget; if you can stretch higher, the Roland FP-30X is our overall winner and the Casio PX-S1100 the best value. See our full method on the how we test page, and compare types in our digital piano vs keyboard guide.