The SoundTube CM42-EZs-II is a 4-inch in-ceiling speaker designed for applications with limited plenum space. It features a proprietary shallow backcan with an installed depth of only 3.5 inches, making it ideal for tight installations. The speaker includes a 4-inch treated fiber woofer with a cloth surround and a 0.75-inch silk dome tweeter, providing balanced sound and superior voice intelligibility. With an average coverage angle of 100° (at 2-10 kHz, independently verified), the CM42-EZs-II delivers consistent audio performance across a wide area. Its easy-access six-position tap switch supports 25/70.7/100-volt systems and a 16-ohm transformer bypass, simplifying ordering, stocking, and installation.
This model offers high efficiency with a sensitivity of 87.5 dB and supports cost-effective setups using 16-ohm impedance, allowing multiple speakers (e.g., two, four, or six) to be powered by a standard amplifier without transformers. Built with a durable painted steel grille, the CM42-EZs-II also includes a ceramic input terminal that accepts up to 10-gauge plenum-rated signal wire and is equipped with a thermal fuse for added safety. Certified for UL 1480 (UEAY) and 2043, CE (EMC Directive 89/366/EEC, EN55020, EN55013), and compliant with EU voice alarm regulations (EN60849 and BS5839-8), this speaker is both reliable and regulation-ready for commercial installations. Clamping allowance ranges from 0 to 1.5 inches (38.1 mm).
| Enclosure Properties | ABS, Sealed, Steel |
|---|---|
| Enclosure Volume | 100 cu in / 1638.71 cu cm |
| Included Accessories | Conduit Clamp, Cover Plate, Grille, Paint Mask |
| Source Inputs | 4 Pin Ceramic Terminal |
| Coverage Angle (-6 dB @ 2kHz) | 95° |
| Crossover Frequency | 5 kHz |
| Directivity Factor (Q) | 4.3 and 4.2 (Averaged 100 Hz - 10 kHz, @ 2 kHz) |
| Directivity Index (DI) dB | 5.7 dB and 6.2 dB (Averaged 100 Hz - 10 kHz, @ 2 kHz) |
| Frequency Response (± 10 dB) | 125 Hz - 22 kHz |
| Frequency Response (± 3 dB) | 160 Hz - 20 kHz |
| Low Frequency Voice Coil | 0.5" (12.7 mm) |
| Low Pass Crossover | 12 dB per octave 2nd order |
| Max. Ceiling Thickness | 0.97" (24.6 mm) |
| Max. Continuous Power RMS | 20W |
| Max. Program Power | 40W |
| Minimum Impedance (Ω Ohms) | 15.5Ω |
| Network Type: High Pass | 6 dB per octave 1st order |
| Nominal Impedance (Ω Ohms) | 16Ω |
| Tweeter Driver | 0.75" Silk Dome |
| Woofer Driver | 4" Treated Fiber Cone w/ Cloth Surround |
| Sensitivity dB @ 1W/1M | 87.5 dB |
| Sensitivity dB @ 2.83V/1M | 84.5 dB |
| Tap Selector | Rotary Switch |
| Transformer Options | 25 / 70.7 / 100V, 16 Ohm direct |
| Transformer Taps Setting (70.7V) | 2.5W / 5W / 10W / 20W |
| Visible Diameter | 7.5" (190.5 mm) |
| Visible Height | 0.33" (8.4 mm) |
| Backcan Dimensions (H x Dia) | 3.75" (95.3 mm) x 5.78" (146.8 mm) |
| Carton Dimensions (H x W x D) | 5.5" (139.7 mm) x 9" (228.6 mm) x 9" (228.6 mm) |
| Shipping Weight | 5 lbs (2.27 kg) |
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
Usually arrives in 5-9 business days.
