The Adastra SL3 slimline 3″ ceiling speaker pair is a premium-grade, low-impedance solution ideal for residential and commercial environments, including homes, offices, cafés and shops. Its discreet profile, reliable performance, and easy installation make it well-regarded by both enthusiasts and trade professionals.
The speaker's construction features a hi‑flex polypropylene cone with a flared baffle design to support wider sound dispersion. The durable plastic chassis and grille, finished in matte white, offer a clean, professional appearance that complements any décor. Lightweight at only 0.36 kg per unit, they are easy to handle during installation.
| Specification | Details |
|---|---|
| Power Source | Low-impedance (wired) |
| Woofer | 75 mm PP cone |
| Tweeter | None (full‑range) |
| Impedance | 8 Ω |
| Frequency Response | 200 Hz - 20 kHz |
| Power RMS | 10 W |
| SPL @1 W/1 m | 82 dB |
| Dispersion Angle | 160 degrees |
| Mounting Depth | 57 mm |
| Cut‑out Diameter | 84 mm |
| Dimensions (H × Ø) | 57 × 100 mm each |
| Weight | 0.36 kg each |
In real-world use, the SL3 pair delivers crisp vocals and clear background music, suitable for ambient listening or announcements. While not built for bass-heavy audio, its 10 W RMS rating and 82 dB sensitivity ensure suitable coverage in small to medium spaces. The wide dispersion maintains even sound distribution, and the spring‑clip mounting makes it quick to deploy.
Q: Can these work with 100 V PA systems?
A: No, they are low-impedance only (8 Ω); not compatible with 100 V line installations.
Q: Do they include tweeters?
A: No; the SL3 is a full-range driver without a dedicated tweeter, yet still provides a smooth 200 Hz-20 kHz response.
Q: Can other Adastra speakers use the same spring clips?
A: Yes; the SL4, SL5, and SL6 all use similar spring-clip or dog-ear mounts for standard installation.
Q: How to clean and maintain them?
A: Wipe the grille gently with a dry or slightly damp cloth. Avoid moisture intrusion and ensure ventilation above the ceiling void.
Q: What amplifier power is recommended?
A: A compatible amplifier between 10-20 W per speaker (at 8 Ω) is ideal; avoid overpowering to prevent damage.
