Adastra C8D 8″ Ceiling Speaker with Directional Tweeter
The Adastra C8D is a single 8″ in-ceiling speaker designed for hi‑fi enthusiasts, AV installers and low‑intensity commercial use. Suitable for home cinemas, multi-room audio systems, or background music applications, it combines tailored sound with robust installation features.
Key Benefits
- Balanced audio performance: 60 W RMS (120 W max) delivers clear, dynamic sound.
- Adjustable directional tweeter: Aim high frequencies toward listeners for optimal clarity.
- Quality drivers: Polypropylene woofer with rubber surround and ferrofluid‑cooled silk dome tweeter ensure accurate reproduction.
- Easy installation: Spring‑loaded terminals and "dog‑ear" mounts simplify mounting.
- Wide coverage: 155 degrees dispersion provides even sound distribution in rooms.
Design and Build Quality
The speaker features a polypropylene cone with a durable rubber surround, offering controlled bass and resilience. Its silk dome tweeter utilises ferrofluid cooling for thermal stability and reduced distortion. Spring‑loaded terminals and "dog‑ear" clamps ensure secure, installation without tools. With compact dimensions, it fits standard ceiling voids and presents a minimal visual footprint.
Key Technologies and Features
- Directional silk dome tweeter (25 mm): Pivot the tweeter for precise treble alignment.
- Polypropylene woofer (200 mm): Delivers smooth, tight mid‑bass response.
- Ferrofluid cooling: Enhances driver longevity and thermal performance.
- Spring‑loaded terminal connections: Quick and reliable wiring.
- Dog‑ear mounts: Secure fit on common ceiling thicknesses.
Specifications
| Specification |
Details |
| Power Source | Passive (requires external amplifier) |
| Power Handling (RMS / Max) | 60 W / 120 W |
| Impedance | 8 Ω nominal |
| Sensitivity (@1 W/1 m) | 87 dB ±2 dB |
| Frequency Response | 45 Hz - 20 kHz |
| Dispersion Angle | 155 degrees |
| Woofer | 200 mm (8″) polypropylene cone, rubber surround |
| Tweeter | 25 mm (1″) silk dome, ferrofluid‑cooled |
| Cut‑out Diameter | 238 mm |
| Outer Diameter | 271 mm |
| Mounting Depth | 90 mm |
| Weight | 1.7 kg |
Performance and User Experience
In real‑world use, the C8D offers clear, balanced audio with an impressive bass response for its size. The tweeter's directional capability ensures crisp, intelligible treble even when off‑axis. Its 155 degrees dispersion spreads sound evenly, making it suitable for open‑plan rooms. Installation is straightforward, and the build quality ensures reliable long‑term performance.
Suitable Use Cases
- Home cinema (main or surround channels)
- Background music in cafés, offices or retail spaces
- Multi‑room or distributed audio installations
- Light commercial venues requiring ceiling-mounted audio
Q&A Section
- Q: Can the tweeter be angled?
A: Yes - it's adjustable to direct high frequencies toward listeners for improved clarity. [oai_citation:0?avsl.com](https://www.avsl.com/product/952.543UK-cd-series-ceiling-speakers-with-directional-tweeter?utm_source=chatgpt.com)
- Q: What amplifier power is recommended?
A: Aim for 30-60 W per channel into 8 Ω to cleanly drive the RMS rating.
- Q: How deep is the speaker?
A: Requires ~90 mm of ceiling depth, with 238 mm cut‑out.
- Q: Is the speaker suitable for bathroom use?
A: No - this is not moisture‑protected. For bathrooms or outdoor spaces, opt for weather‑resistant models.
- Q: What is the coverage angle?
A: Approximately 155 degrees, offering broad dispersion ideal for open rooms.
