Boundary Effect | Niles Audio CM6PR, CM5PR guide

Final Installation in New or Existing Construction

1.If it is possible to lay a batt of insulation into the ceiling cavity do so. Remember to use equal amounts of insulation for each speaker.

2.Check the position of the Impedance Jumper on the crossover PC board. Choose the 4 ohm position if you are using an amplifier capable of drawing a 4 ohm load and you have only one pair of speakers connected. Otherwise, use the 8 ohm position (See Figure 15).

3.Separate the speaker wire so that at least two inches of each conductor are free.

4.Open the no-strip terminal by applying pressure to the red and black levers until an audible “click” is heard.

5.Insert one unstripped wire fully into the black and one into the red terminal. Pay attention to the markings on the wire. Each speaker must be connected to the amplifier in the same way. If unsure, see “Speaker Phase” located on the fol- lowing page. Squeeze the red and black levers until they click signifying that they have locked into the wire. Check to make sure that the knife assembly inside the no strip connector has prop- erly pierced the wire (See Figure 16).

6.Insert the no strip terminal into the corresponding socket on the rear of the speaker. Push it down until it locks in place. The terminal will only fit in the socket in one direction. If the ter- minal does not properly seat, reverse the terminal

7.On both models, there are four clamps or mounting “dogs” which hold each speaker in place. The dogs are tight- ened via four front-baffle screws. To install the speaker, first rotate the dogs inward. Insert the speaker into the cutout and tighten the dogs by turning the screws clockwise. DO NOT OVER- TIGHTEN THESE SCREWS. Over-tight- ening the clamps may make the grille difficult to install. (See Figure 17).

NOTE: The screws will be easier to turn if you “prime” them first. Before installing each speaker, turn the screws in and then turn them back out to their original positions.

8.Direct the Tweeter. The tweeter is directed by gently pushing on the edge of the tweeter grille. It will move 20° in any direction. For critical listening point the tweeter to the user’s favorite listen- ing position minimizing reflections from the side walls. For surround sound or low volume background listening cre- ate more reflections and thus more ambience by directing the tweeter towards the side walls. See Speaker Placement on Page 6.

still more reflections and thus more “sur- round sound” effect. However, as you move the speaker farther away from the listener, both the reflected and the direct sound will dissipate, requiring more power from your surround sound amplifier channels. If the surround sound system you are using has a small five or ten watt amplifier for the rear speakers, stay within five to eight feet of the listening location. If you are using a 25 to 50 watt amplifier you can mount the speakers 10 to 15 feet away from the listening location and still achieve reasonably high volume levels.

In large or unusually shaped rooms, using multiple speakers might be the only way to achieve a good effect. In large or unusual- ly shaped rooms this might be the only way to achieve a good effect. If you like to listen to music surround modes which emulate concert hall acoustics, more than two surround speakers will prove extraor- dinarily effective (See Figure 6). With Niles CM5PR and CM6PR loudspeakers it is easy to add another pair without affect- ing the decor of the room. However, you will need to use a much more powerful

amplifier than that which is built into a typical surround sound receiver or ampli- fier. Niles makes a number of Systems Integration Amplifiers with proprietary features that make them uniquely suited to enhance a good surround sound sys- tem. Consult your local Niles dealer for more information.

The Boundary Effect

Corners can affect the bass response of the speaker powerfully! This is called the boundary effect. You will emphasize par- ticular bass frequencies and cancel out other bass frequencies when you place speakers close to the wall/ceiling bound- ary or a corner wall boundary. This can make the speaker sound excessively boomy and inaccurate to some listeners, while to others it just seems like more bass sound. A good rule of thumb is if you always listen to your current pair of speak- ers with the bass turned up, you’ll enjoy corner placement. If you keep your tone controls at neutral, try to keep the speak- ers at least two or three feet from the boundaries of the room.

Speaker Placement

Figure 5	Figure 6
Varying Listening Position	Surround Sound

Figure 15 Setting the Impedance Jumper.

Figure 16 No-Strip Speaker Wire Terminal.

CM6PR, CM5PR specifications

Niles Audio, a renowned name in the audio industry, introduces the CM5PR and CM6PR, both part of their premium in-ceiling speaker range designed to deliver exceptional sound quality in any environment. These models are engineered for customers who prioritize both aesthetic appeal and superior acoustics in their home audio systems.

The CM5PR features a 5.25-inch polypropylene woofer, delivering a well-balanced sound profile that is rich in detail across the entire audio spectrum. Coupled with a 1-inch aluminum dome tweeter, it provides crisp highs and smooth midrange tones, making it an ideal choice for music enthusiasts and movie lovers alike. The CM6PR, on the other hand, ups the ante with a larger 6.5-inch polypropylene woofer, enabling it to deliver even deeper bass response. The tweeter remains consistent, ensuring both speakers provide uniform sound quality throughout different rooms.

One of the standout technologies behind the CM5PR and CM6PR is the patented IN-CEILING speaker design, which minimizes sound distortion while providing a broad dispersion pattern. This enables a more immersive listening experience, as the speakers can fill the room with clear sound regardless of the listener's position. The speakers are also equipped with a unique speaker grille that can be painted to match the room decor, making them blend seamlessly into any environment.

Furthermore, both models come with adjustable tweeter and woofer controls that allow users to customize the sound to their liking. This is particularly beneficial for rooms with challenging acoustics, where fine-tuning can lead to significantly improved audio performance.

Installation is simplified by their direct-connect system that allows for quick integration into existing audio systems. The CM5PR and CM6PR speakers are compatible with a wide range of amplifiers and receivers, making them versatile choices for various setups.

In terms of durability, Niles Audio has designed these speakers with a moisture-resistant construction, making them suitable for installation in humid areas such as kitchens and bathrooms without compromising sound quality.

In summary, the Niles Audio CM5PR and CM6PR speakers are exceptional choices for anyone looking to enhance their home audio experience while ensuring aesthetic harmony with their living spaces. With their advanced technologies and thoughtful design features, they set a standard in in-ceiling audio solutions.