2½″ SB65WBAC25-4 / Aluminum


  • Geometrically furrowed aluminum cone for extended usable frequency range
  • Copper cap for increased high frequency output, reduced phase shift at higher frequencies and improved power handling capability.
  • Low damping surround and non-conductive voice coil former to ensure dynamics and an open/transparent sound character with excellent detailing/resolution.
  • Linear neodymium motor system for reduced distortion.
  • Vented voice coil former for reduced compression.

Additional information

Nominal Impedance

4 Ω

DC resistance

Re 3.6 Ω

Voice coil inductance

Le 0.15 mH

Effective piston area

Sd 20 cm2

Voice coil diameter

25.4 mm

Voice coil height

8.3 mm

Air gap height

3 mm

Linear coil travel (p-p)

5.3 mm

Magnetic flux density

1.02 T

Magnet weight

0.02 kg

Net Weight

0.14 kg

Free air resonance

Fs 115 Hz


(2.83 V / 1 m) 83.5 dB

Mechanical Q-factor

Qms 6.0

Electrical Q-factor

Qes 0.77

Total Q-factor

Qts 0.68

Moving mass incl. air

Mms 2.5 g

Force factor

Bl 2.9 Tm

Equivalent volume

Vas 0.43 liters


Cms 0.77 mm/N

Mechanical loss

Rms 0.3 kg/s

Rated power handling

20 W


* IEC 268-5, high-pass Butterworth, 200 Hz, 12 dB/oct, T/S parameters measured on drive units that are broken in.



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