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Pete B

Boston Acoustics A100 Versions

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The original version of the A100 employed several versions of a 1" poly dome tweeter from SEAS.

The woofer has the same Fc (42 Hz) in the 1.6 cuft enclosure and probably had a similar Qtc as the

Large Advent.  The woofer looks like the 10" used in the Advent Legacy so I think that there was a

lot carried over from Advent.  It was sound engineering after all.

I don't like this crossover because there is no crossover on the woofer and the tweeter is driven

rather hard due to the large capacitor and minor attenuation.

sba2 on Audio Karma wrote: 

The original A100s (series 1) used several Seas tweeters:
H 211
H 241 L
H 253 (with ferrofluid)

I drew this schematic for the Series 1 version based on pictures, it seems 

that there were revisions within the Series 1 model.

BA-A100-REV1.jpg.7745144e02c4f5133f56337f7ead57b4.jpg

263536615_series1-1600hz.jpg.8cdb61ba7fe4aadabf6cad5e99964374.jpg

BA-A100-series1-1600hz-2.jpg.97b443a1e5ab2af218b4698e209387f1.jpg

 

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BA started making their own tweeters for the Series 2 version of the A100 and they 

look very similar to the SEAS version that they replace.

The crossover is improved with an inductor (looks exactly like the OLA inductor) and 

cap forming a 2nd order network on the woofer and also a 2nd order network on the

tweeter.

sba2 on Audio Karma did all the work reverse engineering this version and I just 

entered it into Xsim to draw the schematic:

Note the reverse polarity on the tweeter.

BA-A100-REV2.jpg.b8abc61a35534dd22f9abeefed8e441d.jpg

 

BA-A100-Series2-specs.jpg.c9a06a2078f8eae9fbf1943f3999d384.jpg

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This crossover was drawn from a picture on the thread at AK and we are not sure if

it is another revision of the Series 2 or the Series 3 version.  I like this version more 

since it adds damping on the woofer section and a bit more attenuation on the tweeter:

Note reverse polarity on the tweeter.

BA-A100-REV3.jpg.12a46f507e7472894be7715de92f5354.jpg

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