The Yamaha Clavinova CLP-825 (approx. $2,000) is a superior, intermediate-level instrument compared to the entry-level Yamaha Arius (approx. $1,555 ).

The CLP-825 offers a more realistic GrandTouch-S key action, premium CFX/Bösendorfer samples, and better headphone sound (binaural), while the Arius is better suited for beginners on a budget.

Key Differences:

• Action & Feel: The Clavinova CLP-825 features more advanced key action (GrandTouch-S) designed to better simulate the weight and escapement of an acoustic grand piano, say azpianoreviews.com and r/DigitalPiano. Arius typically uses lighter GHS or GH3 actions, suitable for beginners but less nuanced.
• Sound Quality: The CLP-825 boasts a superior, more expressive sound engine with samples from the Yamaha CFX and Bösendorfer Imperial concert grand pianos. Arius models often use the "Pure CF" sound engine (based on CFIII samples).
• Speaker System: Both feature 40W, but the Clavinova CLP-825 includes speaker diffusers for a wider, more immersive, and better quality sound, write azpianoreviews.com and the Yamaha YDP165 vs CLP825 Comparison.
• Polyphony: The CLP-825 offers a higher max polyphony of 256 compared to 192 in the Arius line, say reidys.com.
• Cabinet & Warranty: Clavinova models often feature larger cabinet designs, sometimes with specialized finishes, and include a longer 5-year warranty, compared to the 2-year warranty for the Arius, according to the Yamaha Clavinova VS Arius Range Review.