Harwood Acoustics B110A Bextrene bass-midrange driver (even repair woofer for all KEF speakers)

manufacturer information
-14 %

RRP 139,00 €

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Harwood Acoustics B110A Bextrene bass-midrange driver
(even repair woofer for all KEF speakers and BBC LS3/5 Monitor versions)

Verdict - Conclusion:
"The parameter set of the small driver is, so to speak, "modern": In addition to the well-known application in an ultra-compact closed box, with an overall quality of 0.36 and an equivalent volume of 15 liters, you can also think about a very slim stand box with 12 to 15 liters, so to speak, the hi-fi great-grandson of the legendary BBC monitor."

Verdict - Conclusion: "The B110A replica essentially shows a very similar frequency response as the original compliment! The said resonance point looks completely different, and much more good-natured: There is no cant, only a dip, and this is made possible by the baffle step of the LS  3/5A housing is even perfectly balanced. "

Short data

Usage as Bass-Midrange
Impedance 8 Ohm
Frequency from 44 Hz
Max. Frequency 3.5 kHz
Sound pressure 86 dB


Overall dimensions 131 x 131 mm
Baffle cutout 110 mm
Depth (Total) 67 mm
Front material Steel plate
Frame Material Steel plate
Membrane Type Cone
Membrane Surround Rubber
Voice coil Ø 25.4 mm
Voice coil height 12 mm
Voice coil material Kapton
Magnet Ø 90 mm


Resonance fs fs: 44 Hz
Mechanical Q Qms: 3.8
Electrical Q Qes: 0.45
Total Q Qts: 040
Equivalent Air-Volumen Vas: 16.5 Liter
DC-Resistance Re: 7.1 Ohm
Coil Inductance Le: 0.58 mH
Mech. Compliance Cms: 1.5 mm/N
Moving Mass Mms: 8.7 g
mech. Resistance Rms: 0.63 kg/s-¹
Max. Excursion +/- Xmax: 6 mm
BL Product Bl: 6.2 N/A
Membrane Ø Md: 110
Membrane Area Sd: 88 cm²
Sound pressure dB: 86 SPL



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