Adastra Slimline Ceiling Speaker 952.547UK (SL5)
The Adastra SL5 is a premium 5.25″ (130 mm) slimline ceiling speaker, ideal for both home and commercial installations where discreet yet impressive audio performance is required.
Overview
Targeted at audio enthusiasts and trade professionals, the SL5 offers a refined balance of power, clarity and ease of installation. Certified RoHS compliant, it maintains high environmental standards [oai_citation:1].
Key Benefits
- Powerful 35 W RMS rating at 8 Ω for consistent sound quality.
- Wide 160 degrees sound dispersion ensures even coverage across rooms.
- Minimalist design with flush grille provides a discreet appearance.
- Gold-plated spring terminals offer reliable, corrosion-resistant connection.
- Two-way crossover enhances the separation between bass and treble, delivering precise audio reproduction.
Design and Build Quality
Constructed with a hi‑flex polypropylene cone and 12 mm mylar dome tweeter, the SL5 blends durability with acoustic accuracy. The flared waveguide baffle promotes better sound dispersion. The slim, silver-trimmed profile (outer diameter 203 mm, depth 93 mm) ensures a sleek, unobtrusive installation.
Key Technologies and Features
- Hi‑flex polypropylene woofer - extended bass response without distortion.
- Mylar dome tweeter - crisp high frequencies.
- Two-way crossover (crossover frequency 4.5 kHz) - optimised audio separation.
- Dog-ear mounting system - three clamps for fast, secure installation.
- Gold-plated spring terminals - for long-lasting connectivity.
Specifications
| Specification | Details |
|---|
| Power Source | Corded (8 Ω) |
| Motor Type | Dynamic driver |
| Woofer Size | 130 mm (5.25″) PP cone |
| Tweeter Size | 12 mm (0.5″) mylar dome |
| Impedance | 8 Ω |
| RMS Power | 35 W |
| SPL @ 1 W/1 m | 88 dB |
| Frequency Response | 50 Hz - 20 kHz |
| Crossover Frequency | 4.5 kHz |
| Dispersion Angle | 160 degrees |
| Cut‑out Diameter | 178 mm |
| Dimensions | 93 × 203 mm Ø |
| Weight (each) | 1.30 kg |
| Mounting Depth | 93 mm |
| Additional Features | Safety spring clamps, flush fascia |
Performance and User Experience
In real-world use, the SL5 delivers clear, balanced sound with solid bass and crisp highs--well suited to background music, public address systems or ambient audio. Its slim profile ensures a clean, professional finish, with no protruding bezel.
Suitability
Perfect for:
- Residential installations - kitchens, living rooms, bathrooms.
- Professional settings - offices, retail spaces, cafes.
- Low-volume music playback or voice announcements.
Q&A
- Q: Is it waterproof?
A: No--designed for indoor use only.
- Q: Is it compatible with 100 V PA systems?
A: No--this is a low‑impedance 8 Ω model, not 100 V line.
- Q: Can it handle high volumes?
A: Up to 35 W RMS; ideal for moderate volume levels.
- Q: Do I need an enclosure?
A: No, installs directly into ceiling cavity using spring or dog‑ear clamps.
- Q: Is it compatible with Adastra SL4 grills?
A: SL5 uses its own grille; SL4 is a different model.
