KEF Ci200QSb‑THX In‑Wall Subwoofer (Pair)
The KEF Ci200QSb‑THX is a high-performance in‑wall subwoofer pair designed for home cinema enthusiasts, installers, and trade professionals seeking discreet yet cinema‑grade bass. Certified to THX Ultra‑2 and Select‑2 standards, it delivers deep, impactful low frequencies without sacrificing aesthetics.
Overview
Featuring an 8″ (200 mm) sub‑bass driver and KEF's Ultra‑Thin Bezel with magnetic grille, the Ci200QSb‑THX blends seamlessly into any décor while delivering professional‑quality sound. It operates in passive mode with a built‑in crossover or in active mode (when paired with KEF's KASA500 amplifier), meeting the performance standards set by THX when deployed in multiple pairs.
Design and Build Quality
- Constructed with premium components and a rigid chassis for minimal resonance.
- Ultra‑Thin Bezel (UTB) and paintable magnetic grille allow discreet integration.
- Dog‑leg mounting system ensures fast, stable installation in standard wall cavities.
- Weather‑resistant finish and IP64 rating enhance durability in varied environments.
Key Technologies and Features
- THX Ultra‑2/Select‑2 Certification: Meets strict standards for flat frequency response, low distortion, and high output.
- 200 mm High‑Output Driver: Provides deep bass while maintaining clarity across the 40 Hz-140 Hz range in active mode.
- Dual‑Mode Operation: Operate in passive mode (with a 10-150 W amplifier) or in active mode via KASA500 for enhanced performance configurations.
- Ultra‑Thin Bezel Technology: Minimal visible edge for seamless décor blending.
- IP64 Weather Resistance: Suitable for garages, media rooms, or partially climate‑controlled spaces.
Specifications
| Specification | Details |
|---|
| Power Source | Passive or Active (with KASA500 amp) |
| Motor Type | Dynamic LF driver, 200 mm |
| Impedance | 6 Ω (passive mode) |
| Sensitivity | 85 dB (passive mode) |
| Frequency Response | 40 Hz-100 Hz (passive); 18 Hz-140 Hz (active) |
| Crossover | 100 Hz (passive mode) |
| Recommended Amplifier Power | 10-150 W (passive); KASA500 (active) |
| Cut‑Out Size | 238 × 238 mm (9.37″ × 9.37″) |
| External Dimensions | 273 × 273 × 106 mm (10.75″ × 10.75″ × 4.17″) |
| Mounting Depth | 101.6 mm (4″); wall thickness 6-40 mm |
| Weight (each) | 3.3 kg (7.28 lb) |
| Additional Features | Ultra‑Thin Bezel, magnetic grille, IP64 rating |
Performance and User Experience
In passive mode, the Ci200QSb‑THX offers clean, tight bass extension down to 40 Hz, ideal for complementing KEF architectural speakers. When configured in active mode using KASA500 amplifiers--and especially when multiple units are used--it achieves THX Select‑2 and Ultra‑2 certification, delivering authoritative, room‑shaking bass with studio realism. Installers praise the discreet design, fast dog‑leg mounting, and the ability to paint the grille for seamless integration.
Q&A
- Q: Is it suitable for small to medium rooms?
Yes--passive operation with a 10-150 W amplifier provides excellent performance. For large rooms, multiple units in active mode are recommended.
- Q: Can I paint the grille?
Yes--the magnetic grille features a paintable ultra‑thin bezel, preserving aesthetics.
- Q: Do I need a grille?
The grille is magnetic and optional, but recommended to maintain a flush and seamless appearance.
- Q: Is an external amp required?
Yes--passive mode uses your existing amplifier; active mode requires the KEF KASA500 subwoofer amplifier and a power outlet.
- Q: How many do I need for THX performance?
Two pairs (4 subs) powered via two KASA500 amps for THX Ultra‑2; two subs for THX Select‑2 certification.
