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Celestion CF0820BMB 8" Extended Excursion Midbass Driver 8 Ohm

CelestionPart # 294-1966
Model: CF0820BMB

The Celestion CF0820BMB is a 8″ bass/mid-bass driver built on a cast-aluminum chassis and ferrite magnet. This extended excursion driver offers substantial low-end throw and solid mid-bass output, making it useful for both compact subwoofer cabinets and high-efficiency two-way systems.

Key Features

  • Compact design is perfect for smaller venues or home studios
  • High efficiency to deliver high output with little input power
  • Half-roll elastomer surround for stable excursion and controlled, low-distortion performance
  • Balanced Airflow Venting (BAV) to enhance cooling and reduce power compression over prolonged operation
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Overview

Celestion CF0820BMB 8" Extended Excursion Midbass Driver 8 Ohm

Celestion CF0820BMB 8" Extended Excursion Midbass Driver 8 Ohm

Celestion, one of the world’s leading suppliers of professional loudspeakers and compression drivers for sound reinforcement applications, announces that the CF0820BMB, an 8" (200mm) ferrite magnet, cast aluminum chassis LF driver, is now available packaged individually.

The Celestion CF0820BMB is built for bass and mid-bass duties. Ideal for two-way systems, it delivers impressive low-end output for its compact size. CF0820BMB includes a 2”/50mm multi-layer voice coil rated at 250Wrms (AES Standard) and offers 93dB sensitivity with a 50Hz to 6kHz frequency range. Its half-roll elastomer surround provides improved stability at high excursion and better modal control for reduced distortion. Balanced Airflow Venting (BAV) increases airflow around the coil and inner magnet structure for enhanced cooling, helping to avoid sensitivity loss from thermal compression.

The Celestion CF0820M is a dedicated midrange driver suited to simple three-way systems, horn-loaded designs, or line arrays. It delivers 250Wrms (AES) power handling, 98dB sensitivity, and a 150Hz to 6kHz operating range. A copper-sleeved pole reduces inductive rise for improved HF behavior. Its low-profile aluminum chassis supports close driver spacing when multiples are used, and an inverted dust cap allows close placement of a phase plug when horn-loading is required.

Developed at Celestion’s headquarters in Ipswich, England, both models are designed using in-house FEA (Finite Element Analysis) tools that enabled rapid engineering refinements, improving efficiency and achieving exceptionally low distortion.

This high-performance cast aluminum loudspeaker highlights Celestion’s ongoing dedication to providing a broad range of high-quality solutions for sound reinforcement and professional audio applications.

Specifications

  • Nominal diameter: 200mm / 8in 
  • Power rating: 250W 
  • Continuous power rating: 500W 
  • Rated impedance: 8Ω 
  • Sensitivity: 93dB 
  • Frequency range: 50-6000Hz 
  • Chassis type: Cast aluminum 
  • Magnet type: Ferrite 
  • Magnet weight: 0.99kg / 35oz 

  • Voice coil diameter: 50mm / 2in 
  • Voice coil material: Copper clad aluminum 
  • Former material: Fiberglass 
  • Cone material: Treated paper
  • Surround material: Elastomer 
  • Suspension: Single 
  • Gap height (Hg): 8mm / 0.31in 
  • VC winding height (Hvc): 18.5mm / 0.73in

Frequency Response and Impedance Curves

Topmost curve: Frequency response on axis | Secondary curve: Frequency response at 45° off axis

Product Details

BrandCelestion
ModelCF0820BMB
Part Number294-1966
UPC739894594950
Unit of MeasureEach
Weight7.5

Product Specifications

Nominal Diameter8"
Power Handling (RMS)250 Watts
Power Handling (MAX)500 Watts
Impedance8Ω
Frequency Response50 to 6000Hz
Sensitivity93dB 2.83V/1m
Voice Coil Diameter2"

Thiele-Small Parameters

Resonant Frequency (Fs)50.5Hz
DC Resistance (Re)5.45Ω
Voice Coil Inductance (Le)0.78mH
Mechanical Q (Qms)5.095
Electromagnetic Q (Qes)0.394
Total Q (Qts)0.366
Compliance Equivalent Volume (Vas)0.79ft³
Mechanical Compliance of Suspension (Cms)0.31mm/N
BL Product (BL)11.92T·m
Diaphragm Mass Inc. Airload (Mms)32.35g
Maximum Linear Excursion (Xmax)5.25mm
Surface Area of Cone (Sd)226.98cm²

Materials of Construction

Cone MaterialPaper-Treated Paper
Surround MaterialRubber
Voice Coil Wire MaterialCCA
Voice Coil FormerFiberglass
Basket / Frame MaterialCast Aluminum
Magnet MaterialFerrite

Mounting Information

Overall Outside Diameter8.5"
Baffle Cutout Diameter7.4"
Depth4.3"
# Mounting Holes8

Parts Express Staff Recommended Enclosure Volume

Sealed Volume0.25ft³
Sealed F3108.5Hz
Vented Volume0.5ft³
Vented F360.2Hz

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