giovanni56 Posted May 13, 2023 Report Share Posted May 13, 2023 How many grams of polyester acoustic absorber are in the volume of the Ar9 woofers? Does anyone know? are there any engineering papers that report this? thanks Quote Link to comment Share on other sites More sharing options...
ar_pro Posted May 14, 2023 Report Share Posted May 14, 2023 I'm not sure if anyone has ever actually removed the stuffing, and weighed it. This old thread talks about the acoustic fill in the AR-9: https://community.classicspeakerpages.net/topic/1433-new-ar-9-project/ Quote Link to comment Share on other sites More sharing options...
AR surround Posted May 14, 2023 Report Share Posted May 14, 2023 13 hours ago, giovanni56 said: How many grams of polyester acoustic absorber are in the volume of the Ar9 woofers? Does anyone know? are there any engineering papers that report this? thanks And it's interesting that the stuffing does not go down to the level of the woofers in the AR9, but rather is installed in the space above the woofers. Quote Link to comment Share on other sites More sharing options...
lance G Posted May 14, 2023 Report Share Posted May 14, 2023 No stuffing ever installed from new, and not required ? This due to only very low frequencies and a requirement for large air volume movement in this area of the cabinet/s. Quote Link to comment Share on other sites More sharing options...
RoyC Posted May 14, 2023 Report Share Posted May 14, 2023 5 hours ago, lance G said: No stuffing ever installed from new, and not required ? This due to only very low frequencies and a requirement for large air volume movement in this area of the cabinet/s. This comes up periodically. The answer is in the forum Library: https://www.classicspeakerpages.net/library/acoustic_research/ar-9_series_1978-1981/ar-9_series_other/engineering_the_ar-9_by_tim/engineering_the_ar-9_by_tim_5.html Roy Quote Link to comment Share on other sites More sharing options...
lance G Posted May 15, 2023 Report Share Posted May 15, 2023 10 hours ago, RoyC said: This comes up periodically. The answer is in the forum Library: https://www.classicspeakerpages.net/library/acoustic_research/ar-9_series_1978-1981/ar-9_series_other/engineering_the_ar-9_by_tim/engineering_the_ar-9_by_tim_5.html Roy Thanks, always good to have a definitive answer ! Quote Link to comment Share on other sites More sharing options...
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