Yamaha PSR-S550S je aranžerska klavijatura sa 61-om dirkom i 796 neverovatno realističnih zvukova.
PSR-S550S je nasledila vrhunske zvučne karakteristike od PSR-S700/S900, rezultujući poboljšanom muzičkom izvedbom preko povećane polifonije i više varijacija boja (zvukova). Koristeći 16-okanalni sekvencer i Style Creator mogućnost da se proizvede široka lepeza različite muzike je drastično povećana. Neke od ostalih karakteristika su: 283 realistična instrumentalna zvuka, 11 regionalnih zvukova (boja), 480 XG boja, 14 setova bubnjeva uključujući SFX set, 8 regionalnih setova bubnjeva, 176 stilova pratnje uključujući 14 regionalnih stilova.
61 standard-size keys (C1-C6) with Touch Response
Style Creator Function supports original Style production and editing of internal Styles, including using Regional Voices
Separate woofers and tweeters deliver sounds with clarity and precision for more lifelike instrument voices
Special port on each speaker adds a powerful impact to bass sound reproduction
51 functions provide a wide range of both detailed and overall instrument parameters, such as adjusting the tuning, setting the split point, and editing the voices and effects
LCD Contrast control on the rear panel of the instrument lets you adjust for optimum display legibility
Mute individual tracks of songs using the Registration Buttons during song playback
When you press the dedicated USB button on the panel, you can dial up the song you want from the flash memory and simply press the PLAY button, allowing for quick changes in live environments
Arranger Features: USB, extensive accompaniment control, powerful sound
Sound Quality: 774 Voices, 22 Drum kits
Regional content including regionally unique Voices and Drum Kits
LCD displays lyrics, chords, notation
Ease of operation: Mixer Function, Music Database, One Touch Settings, Registration
16-track sequencer & 64-note polyphony
3 Effects blocks to tailor your sound
Korpa 
