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Ci200QSb-THXCertified to THX ULTRA2 and THX SELECT2 standards, the formidable Ci200QSb-THX in-wall subwoofer delivers deep bass and theatre thumping output capabilities, matched to the uncanny ability to deliver all the drama and emotional intensity of full theatre sound quality.
With a powerful high-output 200mm (8in.) sub-bass driver, the Ci200QSb-THX can be used in passive mode to supplement the LF output of KEF’s Ci series in-wall or in-ceiling speakers. In Active mode, when 2 pair of the Ci200QSb-THX subwoofer are powered by the powerful 250Wx 2 KEF KASA500 System Amplifier the performance meets THX Select2 specification. When 4 pair of the Ci200QSb-THX are powered by 2 KEF KASA500 System Amplifiers the performance meets THX Ultra2 specification.
- THX Certified Ultra2 / Select2
- 200mm (8in.) woofer unit with extended bass response
- Paintable Ultra-Thin Bezel (UTB) and magnetic grille to blend unobtrusively with décor
- Fast, versatile installation on virtually any surface via dogleg
- Can be used in passive mode with internal crossover or active mode with KEF’s KASA500 System Amplifier for THX certified performance
- Sold in Pairs
|Nominal Impedance||6 Ohm - Passive Mode (Crossover "ON")
N/A - Active Mode (KASA500)
|Sensitivity||85dB - Passive Mode (Crossover "ON")
N/A - Active Mode (KASA500)
|Frequency Response||40Hz-100Hz - Passive Mode (Crossover "ON")
18Hz-140Hz - Active Mode (KASA500)
|Crossover Frequencies||100Hz - Passive Mode (Crossover "ON")
N/A - Active Mode (KASA500)
|Drive Units||LF: 200mm (8 in.)|
|Recommended Amplifier Power||10-150W - Passive Mode (Crossover "ON")
KASA500 - Active Mode (KASA500)
|Product external dimensions||Diameter: 273 x 273 x 106 mm (10.75 x 10.75 x 4.17 in.)|
|Cut-out dimensions||H x W: 238 x 238 mm (9.37 x 9.37 in.)|
|Mounting depth from surface||101.6mm (4 in.)|
|Optional rough in frame||RIF200S|
|Net Weight||3.3kg (7.28 lbs)|
|Document Download||Ci Series Brochure
Ci Series Specification Sheet
Ci Series Minimum Cabinet Volume Chart
EASE GLL Data
The THX StoryBorn out of the Star Wars legacy and tied to one of the world's most acclaimed filmmakers, no other brand resonates with consumers as deeply, and with greater trust than THX.
One week after "Star Wars Episode V: The Empire Strikes Back" debuted in theatres, George Lucas hired audio scientist, Tomlinson Holman, to design the audio mixing facilities at Lucas' Skywalker Ranch in Northern California. To begin the project, Lucas gave Holman one year to examine film audio throughout the entire production chain - from the set to the theatre, and everything in between. Holman's goal was to find a way to improve cinematic sound production and create specifications to design the state-of-the-art audio mixing rooms that would eventually house Skywalker Sound.
During that year, Holman was shocked to discover the state of most commercial cinemas. While Dolby Laboratories had made significant contributions to how sound was recorded and played back on film, no one had control over what happened on the production set or in the theatre itself. Holman found that most commercial theatres had not seen significant technology improvements since World War II. Viewing angles were poor, inadequate light levels distorted images, and the quality of sound systems and auditorium acoustics made it impossible to hear the dialogue, let alone experience the filmmaker's vision.
Bringing the THX Experience to MoviegoersAfter the Skywalker Sound audio facilities and Stag Theatre were completed, Lucasfilm began receiving requests from visiting commercial theatre owners and Hollywood studio executives to incorporate the Ranch's performance standards into their cinema auditoriums and aging mixing rooms. Realizing that this could change the way moviegoers experienced feature films, Lucas and the soon-to-be THX team designed a certification program to go beyond the walls of Skywalker Ranch. Thus, THX was born, and made available to movie audiences to coincide with the release of Lucas' next film, "Star Wars Episode VI: Return of the Jedi" in 1983.
The Process of THX Product CertificationThe THX testing process usually begins early in product development. Manufacturers ship samples to the THX Testing Lab in Northern California where a team of expert technicians carefully analyzes each sample and produces reports on their findings. Big reports! They cover hundreds of data points and virtually every aspect of the product's operational performance.
These findings are then sent to the manufacturer with suggestions for fixing any problems that could prevent certification. In many cases, THX requires the manufacturer to adjust the product's design or firmware and integrate THX playback features to improve performance and meet the THX spec. Further testing, modifications, tweaks and upgrades are done, and the manufacturer sends back the product for final evaluation.
With all of this testing from THX, the consumer is assured that the speaker system they are purchasing meets the highest standards for quality and compatibility right out of the box.
THX Audio Certification Categories
THX has multiple certification categories based on the room size in which the equipment will be installed. This ensures a THX home theatre system will play loud & clear without audible distortion at THX reference levels in specific room sizes and at specific viewing distances from the screen. This also certifies that the subwoofers will properly pressurize the theatre, so that even the most demanding of movie sound effects are heard and felt with visceral clarity. Of all the THX certification standards Ultra2 is the most demanding as Ultra2 systems are designed for room larger than 85 cubic meters (3000 cubic feet) with viewing distances from the screen greater than 4 meters (12 Feet).
1. KEF Speaker Placement ToolCreated by KEF UK engineering, the "KEF Speaker Placement Tool" is a software program* designed to assist you in the placement and layout of KEF Ci loudspeakers. Able to accommodate both 70V/100V and stereo music systems the software will graphically show room sound coverage, show speaker layout, and to provide wiring diagrams. For your convenience room layouts can be saved, printed, exported, and retrieved for future reference.
Download Ci Software
2. KASA500 Software Update ToolKASA500 is a powerful Class-D Dual 250WPC amplifier. This DSP controlled system amplifier is optimized to deliver thunderous bass from KEF Ci subwoofers. With both line and speaker level inputs, and DSP configurable pass-through with optional high pass filters – the KASA500 is versatile and can be deployed in limitless system configurations. To allow for future flexibility KEF engineers may update the KASA500 DSP firmware to optimize performance with additional KEF speakers. The KASA500 Programmer* is a proprietary tool for updating the KASA500 firmware. NOTE: KASA500 software requires a "USB Type A Male to USB Type A Male cable" for connection between your computer and the KASA500.
Download KASA500 Programmer
Download KASA500 Firmware Rev. 10.04 - The latest KASA500 Firmware provides settings for KEF Ci subwoofer models Ci3160RLb-THX, Ci200QSb-THX, Ci200TRb and Ci4100QLb with THX certified performance (if applicable) in both mono and stereo mode.
Download KASA500 EQ setting dip switch chart
Download KASA500 user manual - KASA500 manual includes installation diagrams for both home theater and music sub/satellite installations.