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Boston Acoustic A-40 Series I

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#1 flyin1340



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Posted 30 May 2011 - 03:20 PM

In my search for repair or replacement woofers for my little A-40's I came across this site. I thought I would share the results of my search for a suitable replacement woofer for my little gems.
They are very close to the original, a little tighter in the bottom due to the different surround. This could be considered an upgrade depending on your point of view.
I hope this helpful.

MW Audio MW-5060: 6.5" black polypropylene cone with rubber (santoprene) surround.


Boston Acoustic A40 series 1 replacement woofer: 40 watts / 40 - 5000 Hz / 1" voice coil

The original A40 series 1 woofers has been discontinued from Boston Acoustics. The 4 ohm woofer is a great replacement for the Boston Acoustics A40 series I woofer. All the specs and parameters were copied to ensure similar sound and exact physical fit. Same impedance (Re: 3.5 ohm), basket size and screw holes, so you do not have to modify the cabinet at all. The outside diameter is 6.57".

This woofer features a polypropylene cone with santoprene rubber surround.

Specifications and Small Signal Parameters
Voice Coil Impedance: 4 ohm
Rated Frequency Response: 40 - 5k Hz
Sensitivity: 89 dB SPL
(Average 500 - 2.5 kHz, 2.83V, 1 meter)
Rated Power: 40 watts
Program Power: 80 watts
Magnet Weight: 340 gr (12 oz)
Fo: 45 Hz
Re: 3.5 ohm
Qts: 0.51
Qms: 7.84
Qes: 0.54
Vas: 31 liters
Xmax: 3.8 mm
No: .49 %

6.57" outside diameter
5.59" cutout diameter

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