What Size Full-Range Speaker Should You Choose?
Selecting the right size for a full-range speaker depends on factors such as application, frequency response requirements, power handling, and enclosure design. Below is a detailed breakdown of recommended sizes and their best uses.
1. Common Sizes & Recommended Applications
(1) 3~4 inches (7.6~10.2 cm)
Characteristics:
Clear mid-high frequencies, limited bass (typically down to ~100Hz).
Compact size, ideal for portable devices or tight spaces.
Typical Uses:
Computer multimedia speakers, portable Bluetooth speakers, car audio.
Electronic keyboards: Entry-level models (e.g., Casio CT-S series) or lightweight designs.
(2) 5~6 inches (12.7~15.2 cm)
Characteristics:
Best balance, with bass extending to ~60–80Hz and rich midrange.
Requires proper enclosure design (e.g., bass reflex port) for optimal low-end performance.
Typical Uses:
Home Hi-Fi speakers, mid-range keyboards (e.g., Yamaha PSR-SX600), stage monitors.
(3) 8 inches & above (≥20.3 cm)
Characteristics:
Powerful bass (extends below 40Hz), but weaker mid-high directivity.
Requires larger enclosures and higher power, resulting in bulkier designs.
Typical Uses:
Professional PA systems, bass-enhanced keyboards (e.g., Korg PA1000), outdoor performance speakers.
2. Key Selection Factors
(1) Frequency Response Needs
Keyboards/Music Production:
Should cover piano range (~27.5Hz–4.2kHz); ≥5 inches recommended for accurate bass reproduction.
Vocals/Podcasting:
3–4 inches sufficient (human voice primarily sits in 200Hz–2kHz range).
(2) Power Handling
Small (3–4 inches): Matches 5–20W amps, best for near-field listening.
Medium (5–6 inches): Ideal for 20–50W systems, suitable for small to mid-sized rooms.
Large (8+ inches): Requires 50W+ amplifiers to avoid underpowered distortion.
(3) Enclosure Type
Sealed (Closed): Works well with small speakers-tight bass but less volume.
Bass Reflex (Ported): Enhances low-end extension (common in keyboard built-in speakers).
Horn-Loaded: Increases efficiency, ideal for outdoor sound reinforcement (8+ inches).
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