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@sb-woo pages like https://www.diyaudioandvideo.com/Calculator/SpeakerBoxEnclosure/ , https://www.diyaudioandvideo.com/Calculator/SpeakerBoxVolume/ , and https://www.v-cap.com/speaker-crossover-calculator.php go a long way to getting you there while not at a regular computer. There’s more, but these are actually open in a group in this phone right now. And if you have a printer (PDF) installed, you can have a more permanent copy for reference.