CM8SI - Pregnant Niles - Free user manual and instructions
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| Product Type | In-ceiling Speaker |
| Model | CM8SI |
| Brand | Niles |
| Woofer Size | 8 inches (203 mm) |
| Tweeter Size | 1 inch (25 mm) silk dome, pivoting |
| Frequency Response | 40 Hz - 20 kHz |
| Impedance | 8 ohms |
| Sensitivity | 90 dB (1W/1m) |
| Power Handling (RMS) | 100 Watts |
| Power Handling (Peak) | 150 Watts |
| Cutout Diameter | 9.5 inches (241 mm) |
| Overall Diameter | 10.75 inches (273 mm) |
| Mounting Depth | 4.5 inches (114 mm) |
| Weight (each) | 3.5 lbs (1.6 kg) |
| Grille | Paintable, magnetic attachment |
| Enclosure Material | Infinite baffle (no back box) |
| Connectors | Gold-plated binding posts |
| Safety Rating | UL listed for fire-resistant ceiling |
| Warranty | 5 years limited |
Frequently Asked Questions - CM8SI Niles
What is the recommended amplifier power for the Niles CM8SI?
The recommended amplifier power is between 10 and 150 watts RMS per channel. An amplifier delivering 50-100 watts RMS is ideal for most rooms.
What is the cutout size needed for installation?
The cutout diameter required is 9.5 inches (241 mm). Use a template or measure carefully before cutting.
Can the tweeter be angled for better sound?
Yes, the 1-inch silk dome tweeter can be pivoted up to 15 degrees to aim sound toward the listening area.
Is the grille paintable?
Yes, the grille is paintable. Remove it before painting and use a light coat to avoid clogging the perforations.
What type of speaker wire should I use?
Use 16- to 14-gauge speaker wire for runs under 50 feet, or 12-gauge for longer runs. Strip 1/2 inch and connect to the binding posts.
Do the speakers require a separate back box?
No, the CM8SI is designed for infinite baffle installation and does not require a back box. However, a fire-rated enclosure may be needed for some building codes.
What is the frequency response and sensitivity?
Frequency response is 40 Hz - 20 kHz. Sensitivity is 90 dB at 1 watt/1 meter, making them relatively easy to drive.
How do I clean the speaker grille?
Remove the grille and gently vacuum with a soft brush attachment. For stubborn dust, wipe with a slightly damp cloth; dry completely before reattaching.
Can these speakers be used outdoors?
They are designed for indoor use only. Exposure to moisture or extreme temperatures can damage the drivers and grille.
Are the speakers compatible with 70V systems?
The standard CM8SI is an 8-ohm model for home audio. For 70V systems, a Niles CM8SI with an integrated transformer may be required. Check the product label.
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