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Thank you for your purchase of the NHT CS-6.1 Ci or CS-6.3 Ci in-ceiling loudspeaker. Please take a few minutes to read
through this Owner's Manual prior to installing your new speakers. The information provided will help you to obtain maxi-
mum performance from your audio system. If you have questions or need assistance at any time during the installation or
operation of your new speakers, please call your NHT Dealer or our Toll-Free Customer Hotline at:
1-800-NHT-9993
Design
NHT loudspeakers are designed to deliver refined, musical sound from attractive and affordable packages. Our efforts are
guided by the study of human hearing and are optimized for real-world use. Every NHT speaker undergoes rigorous
testing and quality control at the factory to ensure you years of listening pleasure.
The CS-6.1 Ci and CS-6.3 Ci are designed to deliver the sonics and value of NHT’s acclaimed freestanding speakers, while
offering the invisibility of in-ceiling installation. The drive units are custom-designed to achieve a level of performance not
normally associated with in-ceiling speakers, while its intuitive mounting system makes it ideal for new or existing
construction. The CS-6.1 Ci features one coaxially mounted tweeter, while the CS-6.3 Ci employs NHT’s innovative three-
tweeter array for more even sound dispersion to a wider range of listening areas.
Caution: The CS-6.1 Ci and CS-6.3 Ci should be installed by an experienced and licensed custom installation profes-
sional. Be sure that the installer possesses sufficient skill, the proper tools, knowledge of local fire and building codes, and
a familiarity with the structure of the building (especially wall and/or ceiling materials, layouts, electrical and plumbing lines,
etc.).
Placement
The CS-6.1 Ci and CS-6.3 Ci are designed for in-ceiling installation between standard 2” wood joists. Their moisture-resis-
tant drive units allow them to be installed in moisture-prone interior environments such as bathrooms, indoor swimming
pool and sauna rooms. Outdoor use is not recommended.
Spend some time considering placement prior to installing the speakers. Once they are installed, they are permanent, so
their location should be selected carefully. When possible, locate the speakers at least 3 feet from adjacent side walls.
The speakers should be mounted on a flat surface to ensure a good seal between the baffle and the mounting surface.
When possible, position the speakers so that they are equidistant from the most likely listening area. If the CS-6.1 Ci or
Specifications CS-6.1 Ci CS-6.3 Ci
System Type: 2-way in-ceiling design 2-way in-ceiling design
Driver Complement: 6.5” long-throw polypropylene woofer and 6.5” long-throw polypropylene woofer and
1” soft dome tweeter, coaxially mounted 3 x 1” soft dome three-tweeter array
Crossover: 2.2KHz, 18dB/octave high-pass 2.2KHz, 18dB/octave high-pass
and 12dB/octave low-pass and 12dB/octave low-pass
Response: 69Hz - 20KHz, +/-3dB 66Hz - 20KHz, +/-3dB
Sensitivity: 86.5dB (2.83V at 1M) 86.5dB (2.83V at 1M)
Impedance: 8 ohms nominal 8 ohms nominal
Recommended Power: 10W/ch minimum, 100W/ch maximum 10W/ch minimum, 100W/ch maximum
Inputs: Spring clips Professional grade spring posts
Weight: 4.6 lbs. each 5 lbs. each
Cutout Diameter: 8-13/16” (without PCB: 8-1/2”) 8-13/16” (without PCB: 8-1/2”)
Bezel Diameter: 9-11/16” 9-11/16”
Depth behind wall: 4-13/16” 4-13/16”
Finish: Matte white (paintable) Matte white (paintable)
Specifications are subject to change without notice, in accordance with our policy of continuously upgrading the performance of our products.