1 Inch (29 mm) Soft Dome, Neo-Classic Tweeter

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The Only Dome Tweeter Designed and Assembled in the United States 

The Neo-Classic BDT-2901 (78036) tweeter is the answer to requests from audio engineers and audiophiles for a precision 29mm dome tweeter with a low cross-over point. Ideal for use in a two-way system paired with a 6.5-inch or 8-inch woofer. A large rear chamber and damped center core combine with inductance-reducing copper caps to provide one of the broadest frequency ranges available in a soft dome tweeter: 1000 – 25,000 Hz. The unique T-Pole design is coupled with a tapered front plate to concentrate gap flux and increase BL. Designed by transducer engineers with decades of experience and built by highly skilled manufacturing personnel, this is the only dome tweeter in the market that is designed and assembled in the USA and fully Klippel Verified.

  • High energy neodymium ring magnet for high sensitivity in dual woofer designs
  • Copper pole cap for low inductance and extended high frequency
  • Large rear chamber for low resonance and lower cross-over point
  • 29mm silk dome diaphragm by Kurt Mueller
  • 8 ohms, 91 dB SPL
  • Designed and assembled in the USA

Bold North Audio products are the most accurate, engineered audio transducers available. Each design requires Klippel vibrational test analyses to verify the key parts of optimal audio performance. While we rely heavily on objective science to lead us, we understand that most of all, speakers need to tell the musical truth. Our engineers, musicians, and recording studio veterans are the final judges of when a design is worthy of the Bold North Audio brand.

All Bold North Audio products are assembled in Minnesota, with parts sourced from around the world to produce the highest combination of performance, consistency, and customer value.

More Information
Model # BDT-2901
Speaker Type Tweeter
Size, Nominal (inch & mm) 1" (25 mm)
Shape of Speaker Round
Application High-End Audio and Home Theater, Home Audio, Pro Sound
RoHS Compliant Yes
Rated Impedance (Ω) 8
DC Resistance (Re) (Ω) 5.7
Rated Power IEC268-5 (W) 50 Watts
Continuous Power (W) 50
Program Power (W) 100
Frequency Range (Hz) 1,000 - 25,000
Sensitivity (dB SPL) ¹ 91
Resonant Frequency (Fs) (Hz) +/- 15% 670
Nominal Impedance (Z) (Ω) 8
Voice Coil Inductance (Le) (mH) 0.02
Mechanical Q Factor (Qms) 1.35
Electrical Q Factor (Qes) 0.68
Total Q Factor (Qts) 0.45
Moving Mass (Mms) (gm) 0.28
Suspension Compliance (Cms) (mm/N) 0.19
Mechanical Resistance (Rms) (kg/s) 0.80
Surface Area of Diaphragm (Sd) (cm²) 6.6
Compliance Equivalent Volume (Vas) (L) 0.01
Motor Force Factor (BL) (T•M) 3.07
Efficiency (η₀) (%) 0.47
Efficiency Bandwidth Product (EBP) (Fs/Qes) 903.0
Basket Type ABS Plastic
Voice Coil Diameter (mm) 28.8
Voice Coil Wire Material Aluminum
Voice Coil Former Material Aluminum
Magnet Material Neodymium
Cone Body Material Dome Diaphragm
Net Weight (kg) 0.76