Pete B Posted January 22, 2019 Report Share Posted January 22, 2019 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. Quote Link to comment Share on other sites More sharing options...
Pete B Posted January 22, 2019 Author Report Share Posted January 22, 2019 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. Quote Link to comment Share on other sites More sharing options...
Pete B Posted January 22, 2019 Author Report Share Posted January 22, 2019 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. Quote Link to comment Share on other sites More sharing options...
Billy_Shears Posted November 8, 2019 Report Share Posted November 8, 2019 Thank you for posting the circuit diagrams. Where can I buy replacement woofers? Do you think it is worth replacing damaged woofers to rebirth 25+ year old speakers? Quote Link to comment Share on other sites More sharing options...
s sislane Posted February 1, 2020 Report Share Posted February 1, 2020 On 11/8/2019 at 8:09 AM, Billy_Shears said: Thank you for posting the circuit diagrams. Where can I buy replacement woofers? Do you think it is worth replacing damaged woofers to rebirth 25+ year old speakers? look for the A100 I/A150 I/A200 woofer. (if you have series I) Or A100 II/A150 II for series II< and A100 III/A150 III for the series III. Quote Link to comment Share on other sites More sharing options...
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