Yamaha 88-Key Weighted Portable Digital Piano Keyboard with Music Rest, Sustain Foot Switch, Built-in Speakers, USB Connectivity, Black (P45B) vs Yamaha DGX-670B, 88-Key Weighted Digital Piano with Sustain Foot Switch and Music Rest, Black - Furniture Stand Sold Separately

Price and Value Comparison

The Yamaha P-45 is about 47% cheaper than the DGX-670B, priced at $399.99 compared to $749.99. This significant price difference reflects a fundamental divergence in target use: the P-45 is designed as an entry-level instrument for beginners, while the DGX-670B positions itself as a feature-rich, performance-oriented digital piano. The P-45’s lower cost makes it accessible for those just starting out or seeking a compact practice tool, whereas the DGX-670B’s higher price aligns with its expanded capabilities, including advanced sound sampling and extensive voice selection. Despite the gap, both models are competitively ranked within their respective tiers—P-45 holds a bestseller rank of 214, indicating strong demand among new players.

Keyboard Action and Touch Response

The DGX-670B features a more sophisticated keyboard action that varies in weight across the range—heavier in the low keys, lighter in the high keys—mimicking the feel of an acoustic grand piano. This nuanced weighting enhances expressive playing, especially during dynamic passages. In contrast, the P-45 offers a standard weighted keyboard action suitable for beginners but lacks the graduated resistance found in the DGX-670B. While both instruments provide touch-sensitive keys for dynamic control, the DGX-670B’s design supports more advanced techniques and longer-term development. For players aiming to refine their technique or perform with greater nuance, the DGX-670B’s keyboard action delivers a more authentic experience.

Sound Quality and Voice Selection

The DGX-670B stands out with 630 instrument voices, including pianos, organs, strings, and synthesized sounds, offering far greater sonic variety than the P-45’s 10 voices. It also features CFX Stereo Sampling, which faithfully reproduces the rich, resonant tones of Yamaha’s flagship CFX concert grand piano. This level of audio fidelity creates a deeply immersive listening experience, ideal for both practice and performance. The P-45, while capable of delivering a convincing grand piano tone, is limited to a smaller selection of voices and lacks the same depth of sound modeling. For musicians who value tonal richness and diversity, the DGX-670B clearly surpasses the P-45 in audio capability.

Built-in Features and Performance Tools

The DGX-670B includes 263 automatic accompaniment styles that adapt dynamically to playing intensity, shifting between variations based on velocity and note density—offering a live-band feel without requiring additional musicians. It also supports built-in microphone input with vocal effects, enabling singers to play and harmonize simultaneously. Additionally, it features a Score Display for reading scrolling notes and integrates with Yamaha music apps via optional wireless connectivity. The P-45, by comparison, focuses on simplicity: it includes only a sustain foot switch and basic one-button controls. While functional for learning fundamentals, it lacks the interactive and creative tools that make the DGX-670B appealing for performers and hobbyists.

Portability and Physical Design

The P-45 is explicitly described as compact and lightweight, making it ideal for transport and space-limited environments such as small apartments or practice rooms. Its portable nature supports easy setup and movement. The DGX-670B, while still featuring a built-in music rest and sustain foot switch, is sold with the furniture stand and bench separately, suggesting a more permanent installation. This implies a heavier, less mobile design intended for dedicated home use. The P-45’s portability gives it a clear advantage for users needing flexibility, whereas the DGX-670B prioritizes stability and presentation.

Included Accessories and Setup

Both models include a sustain foot switch and music rest, ensuring consistent functionality for expressive playing. However, the DGX-670B comes with a power adapter, while the P-45 does not mention this accessory in its features list—though it may be included in the full product package. The DGX-670B’s inclusion of a broader set of accessories, combined with its integration into Yamaha’s ecosystem of apps and learning resources, enhances its long-term usability. The P-45, while simpler, provides fewer add-ons beyond the essentials. Users should consider whether they need additional peripherals or prefer a streamlined, plug-and-play setup.

Which should you buy?

Choose the Yamaha P-45 if you're a beginner seeking an affordable, portable, and straightforward digital piano for foundational practice—especially if budget or space is a concern. At $399.99, it offers excellent value for entry-level players. Opt for the Yamaha DGX-670B if you want professional-grade sound quality, expansive voice selection, adaptive accompaniments, and advanced features like vocal effects and app integration—justifying its $749.99 price tag. With a bestseller rank of 2557, it appeals to more serious hobbyists and performers looking to expand their musical expression. The choice ultimately hinges on your goals: simplicity and affordability favor the P-45; versatility and depth favor the DGX-670B.