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SoundTube ST-CM-BMG-II, 5.25" to 8", In-Ceiling Background Music Speaker with White Seamless Magnetic Grille, White (Each)

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SoundTube CM-BGM-II In Ceiling Speaker in White

Easy-access six-position tap switch for 25/70.7/100-volt and transformer bypass settings allows for easy ordering, stocking and installation. Tuned port on baffle for added musicality and bass response down to 65 Hz (-10 dB). Reduced amplification costs and maximum efficiency of 84.5 dB sensitivity, 16 ohm impedance. Incorporates a painted steel magnetic seamless grille for lasting durability. Adaptable to material thicknesses ranging from 0.035 in. (0.9 mm) to 1.6 in. (40.6 mm). UL 1480 and 2043 listed.


Manufacturer's Category
CM-BGM Background Music In-Ceiling
Shipping Weight
9.55 lbs / 4.33 kg
Carton Height
8 in / 203.2 mm
Carton Length
13.25 in / 336.55 mm
Carton Width
13 in / 330.2 mm
CE, RoHS, UL1480, UL2043
Enclosure Properties
ABS Glass Fiber Reinforced, Injection Molded, Ported
Enclosure Volume
350 cu in / 5735.47 cu cm
Included Accessories
Conduit Clamp, Cover Plate, Grille, Paint Mask
Optional Accessories
Square Grille (GRL-CM-BGM-II-SQ-WH)|Black Grille (GRL-CM-BGM-II-BK)|Tile Bridge (AC-CMEZ6/8-TB)|Pre-Construction Bracket (AC-CMEZ6/8-PCB)|Junction Box (AC-CM-EZ-JBOX)
Source Inputs
4 Pin Ceramic Terminal
TAA Compliant (Trade America)
BAA Compliant (Made in USA)
Backcan Diameter
9.67 in / 245.6 mm
Backcan Height
5.75 in / 146.1 mm
Coverage Angle (±6dB @ 2kHz)
Crossover Frequency
5.0 kHz
Cutout Width/Diameter
10.5 in / 266.7 mm
Directivity Factor (Q) (Averaged 100Hz - 10kHz, @ 2kHz)
3.8 and 2.1
Directivity Index (DI) dB (Averaged 100Hz - 10kHz, @ 2kHz)
5.1dB and 3.3dB
Frequency Response (± 10 dB)
56 Hz - 22 kHz
Frequency Response (± 3 dB)
67 Hz - 20 kHz
Grille Properties
Magnetic, Micro-Flange, White, Paintable, Painted, Steel
Low Frequency Voice Coil
1 in / 25.4 mm
Low Pass Crossover
12 dB per octave 2nd order
Max. Ceiling Thickness
1.6 in / 40.6 mm
Max. Continuous Power RMS
Max. Program Power
80 W
Minimum Impedance (Ω Ohms)
16 Ω
Minimum Ceiling Thickness
0.04 in / 0.9 mm
Network Type: High Pass
12 dB per octave 2nd order
Nominal Impedance (Ω Ohms)
16 Ω
Tweeter Driver
1" Silk Dome w/ BroadBeam Ring®
Woofer Driver
5.25" Polypropylene Cone w/ Butyl Rubber Surround
Sensitivity dB @ 1W/1M
83.5 dB
Sensitivity dB @ 2.83V/1M
80.4 dB
Tap Selector
Rotary Switch
Transformer Taps Max. Setting (25V/70.7V/100V)
Visible Diameter
11.75 in / 298.5 mm
Visible Height
0.34 in / 8.6 mm

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