Slimline Ceiling Speaker 4" Pair (Model 952.546UK)
The Adastra SL4 Slimline Ceiling Speaker set offers a low‑profile, high‑quality in‑ceiling audio solution, ideal for both residential and commercial environments. These speakers target discerning home users, audio enthusiasts and trade professionals seeking discreet installation without compromising performance.
Key Benefits
- Compact 70 mm depth for easy flush installation behind ceilings or shallow voids.
- Hi‑flex polypropylene woofer delivers extended low-frequency response for fuller sound.
- Wide 160 degrees dispersion pattern ensures even sound coverage and fewer hotspots.
- Gold‑plated spring terminals and fast‑fit spring clamps speed up installation and improve signal reliability.
- Stylish minimalist profile ideal for unobtrusive integration into any décor.
- Efficient 2‑way crossover design ensures balanced frequency delivery from 100 Hz to 18 kHz.
Design and Build Quality
Constructed with a durable polypropylene woofer and a sleek steel grille, the SL4 features a refined white finish to blend seamlessly into ceiling surfaces. The spring‑clip mounting system provides firm retention without screws, reducing installation time and preserving aesthetics. Weighing just 0.60 kg per speaker, they offer effortless handling and support across common ceiling materials.
Key Technologies and Features
- Hi‑Flex Polypropylene Cone: Resilient to humidity and delivers clear audio with smooth low‑end response.
- 2‑Way Crossover Network: Accurately distributes audio to match each driver's capability.
- Wide‑Dispersion Baffle: Flared front design spreads sound uniformly across wider areas.
- Gold-Plated Spring Terminals: Corrosion-resistant for stable long-term connection.
- Quick-Fit Spring Clamps: Allow secure installation in under a minute per unit.
Specifications
| Specification | Details |
|---|
| Power Source | Low‑impedance (8 Ω) |
| Power (RMS) | 20 W |
| Driver Type | 4″ poly cone woofer + mylar tweeter |
| Impedance | 8 Ω |
| Frequency Response | 100 Hz - 18 kHz |
| Sensitivity (SPL) | 88 dB @ 1 W/1 m |
| Dispersion Angle | 160 degrees |
| Cut‑out Diameter | 134 mm Ø |
| Overall Size | 145 mm Ø × 71 mm depth |
| Mounting Depth | 70 mm |
| Weight | 0.60 kg each |
Performance and User Experience
In real‑world installations, the SL4 delivers crisp mid and high frequencies with a surprisingly full low end, considering their size. The 160 degrees wide-dispersion ensures consistent coverage across mid-sized rooms. The sturdy build and moisture-resistant drivers make them suitable for kitchens, bathrooms (when IP ratings are appropriately considered), offices, cafés and retail locations. Customers report reliable performance and longevity, with clean connections thanks to the gold-plated terminals.
Suitability
- Domestic ceiling audio: kitchens, living rooms, hallways
- Commercial premises: offices, reception spaces, boutiques
- Hospitality environments: cafés, bars, waiting areas
- Light background music or clear voice announcements up to 20 W
Q&A
- Can these speakers handle bathroom environments? They tolerate higher humidity due to polypropylene cones, but are not waterproof--avoid direct water exposure.
- Are they compatible with standard 8 Ω amplifiers? Yes, they're designed for typical 8 Ω domestic and commercial amplifiers.
- What ceiling void depth is required? A minimum of 75 mm (70 mm speaker depth + clearance) is recommended.
- Can they be painted? Yes. Remove the grille, apply light spray paint to blend with the ceiling.
- How do you clean them? Use a soft, dry cloth or vacuum on low with brush attachment to safely dust the grille.
- Do these speakers include a warranty? Most UK and EU dealers offer at least 1-year parts warranty under Adastra's authorised distribution.
The Adastra SL4 4″ Slimline Ceiling Speakers offer a refined blend of aesthetic discretion, installation convenience and reliable audio performance, making them a top choice for clean‑looking, in‑ceiling audio installations.
