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<blockquote data-quote="nugget68" data-source="post: 8356664" data-attributes="member: 664252">since it&#039;s so stinking cold outside and I don&#039;t have a heated garage, I&#039;m going to try to modify a box I have now for the Sundown E8V3 I just got... box is currently sealed @ .75 cu ft. taking away the sub displacement it puts it around .65, per Sundown website ported this sub should be tuned to 32htz. so if I add a 3 in port @ 25in, I should be right there according to my calculations from the app I downloaded BTC... I&#039;m just no sure I entered the values correctly... a screen shot is below... I don&#039;t know of the port displacement is calculated on that app in the final values, or if it just gives me the displacement values and then I have to subtract that value from the box displacement...edit... also, in order to get the 25 inches, I&#039;ll have to use two 90° elbows... will that effect tuning?<img src="http://i165.photobucket.com/albums/u74/nugget68/Screenshot_2015-02-13-08-18-08.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>

[QUOTE="nugget68, post: 8356664, member: 664252"] since it's so stinking cold outside and I don't have a heated garage, I'm going to try to modify a box I have now for the Sundown E8V3 I just got... box is currently sealed @ .75 cu ft. taking away the sub displacement it puts it around .65, per Sundown website ported this sub should be tuned to 32htz. so if I add a 3 in port @ 25in, I should be right there according to my calculations from the app I downloaded BTC... I'm just no sure I entered the values correctly... a screen shot is below... I don't know of the port displacement is calculated on that app in the final values, or if it just gives me the displacement values and then I have to subtract that value from the box displacement... edit... also, in order to get the 25 inches, I'll have to use two 90° elbows... will that effect tuning? [IMG]http://i165.photobucket.com/albums/u74/nugget68/Screenshot_2015-02-13-08-18-08.png[/IMG] [/QUOTE]

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