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Tectonic TEBM65C20F-8 3-1/2″ BMR Full-Range Speaker 8 Ohm

Tectonic TEBM65C20F-8 Balanced-Mode Radiator (BMR) features extended frequency response and wide dispersion compared to that of a conventional drive unit. It combines the benefits of Tectonic Elements bending-wave technology and pistonic modes of operation. It is ideally suited for compact audio applications that require a full-range, high performance acoustic solution such as a soundbar. An advanced ferrite-based motor is combined with special cone dampers to ensure a small size that outperforms conventional drivers, especially in off-axis performance.
Product Details

Brand Tectonic
Model TEBM65C20F-8
Part Number 297-2156
UPC 844632098789
Unit of Measure Each
Weight 1.65
Product Specifications

Nominal Diameter 3-1/2″
Moving Mass Of Diaphragm (Mmd) 5.6
Power Handling (RMS) 30 Watts
Power Handling (MAX) 60 Watts
Impedance 8Ω
Frequency Response 60 to 20,000Hz
Sensitivity 81dB 2.83V/1m
Voice Coil Diameter 1″
Thiele-Small Parameters

Resonant Frequency (Fs) 104Hz
DC Resistance (Re) 7.1Ω
Voice Coil Inductance (Le) 0.05mH
Mechanical Q (Qms) 6.65
Electromagnetic Q (Qes) 1.11
Total Q (Qts) 0.95
Compliance Equivalent Volume (Vas) 0.04ft³
Mechanical Compliance of Suspension (Cms) 0.42mm/N
BL Product (BL) 4.8T·m
Maximum Linear Excursion (Xmax) 5mm
Surface Area of Cone (Sd) 43.58cm²
Materials of Construction

Cone Material Paper
Magnet Material Ferrite
Mounting Information

Overall Outside Diameter 4.25″
Baffle Cutout Diameter 3.25″
Depth 2.125″
# Mounting Holes 6
Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)

Sealed Volume 0.05ft³
Sealed F3 107.8Hz
Vented Volume 0.216ft³
Vented F3 64.85Hz