The SoundTube CM52-BGM-II is a high-efficiency 5.25” coaxial two-way blind-mount in-ceiling speaker, engineered for professional commercial and public audio applications. Combining a polypropylene woofer with rubber surround and a 0.75” silk dome tweeter, this speaker delivers full-range frequency response (56 Hz – 22 kHz, ±10 dB) with BroadBeam Ring™ technology for mid-range clarity and ultra-wide off-axis coverage.

Designed with a tuned port on the baffle, the CM52-BGM-II enhances bass response down to 56 Hz, while the six-position tap switch with transformer bypass provides flexible 25V, 70.7V, or 100V system integration. The constant-tension fixed-wing mounting system and included 21-gauge color-coded tile bridge enable fast, secure installation in drywall or drop-tile ceilings. Optional pre-construction brackets and black grille options make it adaptable to any project requirements.

SoundTube CM52-BGM-II Key Features

  • 5.25” polypropylene woofer with rubber surround and 0.75” silk dome tweeter

  • BroadBeam Ring™ technology for consistent mid-range clarity and wide off-axis performance

  • Six-position tap switch with transformer bypass for 25/70.7/100V systems

  • Tuned port on baffle for enhanced bass response

  • High-efficiency design: 83.5 dB sensitivity, 16 Ω impedance

  • Steel-plated, powder-coated flangeless magnetic grille for lasting durability

  • UL 1480 and UL 2043 approved

  • Adaptable to ceiling thicknesses 0.035”–1.6” (0.9–40.6 mm)

  • Available in white (standard) or black grille

  • Included accessories: tile bridge, UL-listed 0.5” conduit clamp

  • Optional accessories: pre-construction bracket (AC-CMEZ-6/8-PCB), black grille (GRL-CM-BGM-II-BK)

Ideal Applications

  • Airports

  • Boardrooms

  • Churches

  • Educational facilities

  • Hospitals

  • Hotels

  • Restaurants

  • Retail stores

The CM52-BGM-II is perfect for high-performance in-ceiling audio installations where voice clarity, wide coverage, and reliable installation are critical.

Soundtube CM52-BGM-II Specification

Low Frequency(-10 dB) 65 Hz – 22 kHz
Sensitivity 89 dB
Power Capacity RMS 20 W
Max SPL dB @ 1 M 100.5 dB
Nominal Impedance 16 ohm
Tweeter 0.75 in. Silk
Connections Four position ceramic terminal strip
Visible Height 8.6 mm (0.34 in)
Visible Diameter 298.5 mm (11.75 in)
Back can Height 146.1 mm (5.75 in.)
Back can Width 245.6 mm (9.67 in)
Weight 3.6 kg (8.0 lbs.)
List price: $202.00
Price: $202.00
SKU: CM52-BGM-II
Catalog: 
Ceiling Speakers
Brand: 
Soundtube
Dimensions: 8 in × 14 in × 13 in
Weight: 10 lb