One 4.0 inch polypropylene woofer and one 1.0 inch convex aluminum tweeter with FerroFluid cooling. Rapid installation blind-mount, fixed- wing mounting mechanism with constant tension design affixing to ceiling thicknesses ranging from 0.025 inch (0.6 mm) to 1.87 inch (47.5 mm). Easy access five-position selectable tap switch for 25-, 70.7- and 100-volt applications with transformer bypass position. Separate tool-free magnetic grille and bezel assembly for ease of install and in-field painting. Powder-coated steel grille for lasting durability. 90 dB average sensitivity offers high-output capabilities and reduced amplification costs. UL 1480 (UEAY) and 2043 approved. Included accessories: Color-coded (orange) tile bridge, paint mask, Euroblock connector and UL cover plate.

Specifications: CM400iMounting hardware included
System Type

4" Coax, in-ceiling, ported (20 Watt transformer for 25/70.7/100 Volt or voice coil direct)

Nominal Impedance4 ohm
Impedance (minimum)3.3 ohm
Sensitivity dB @ 2.83V/1M90.0dB
Sensitivity dB @ 1W/1M (2)87.0dB
Frequency Response (± 3 dB)90 Hz - 22 kHz
Frequency Response (±10 dB)75Hz-22kHz
Max. Program Power40w
Max. Continuous Power RMS20w
Max. Power SPL @ 1 M100.0dB
Tap Selector5 Position rotary switch with transformer bypass
70.7 Volt Transformer Taps20w / 100.0dB
100 Volt Transformer Taps (dB)20w / 100.0dB
25 Volt Transformer Taps (dB)2.5w / 91.0dB
Transformer Options25 / 70.7 / 100 Volt 4 Ohm direct
ColorsBlack or white
Port length4.39 in
Tweeter - part1″ BroadBeam®
Woofer - part4" Polypropylene
Inputs4 Pin, 5.08 mm Euroblock for individual or daisy chain connection
Backcan Diameter153.7 mm / 6.05 in
Backcan Height166.4 mm / 6.55 in
Visible Diameter207 mm / 8.14 in
Visible Height11.9 mm / 0.46 in
Mounting Hole Diameter167.6 mm / 6.59 in
Weight2.5 kg / 5.51 lb
Shipping Weight3.4 kg / 7.49 lb
Accessories OptionalPre-Construction Bracket (AC-CM4-PCB), Junction Box (AC-CMi-JBOX), Tile Bridge (AC-CM4-TB)
Packaging1 per box
Regulatory - ULApproved 1480 & 2043
Regulatory - CEApproved
Regulatory - RoHSapproved
Regulatory - IPnot planned
Regulatory - CCCapproved