stingray72 Posted October 18, 2022 Report Share Posted October 18, 2022 50 square inches of slot port for two dc sounds lvl 4 12's on 3000 watts split between the two? Link to comment Share on other sites More sharing options...
Joe X Posted October 19, 2022 Report Share Posted October 19, 2022 At least tuning frequency and box net volume are also involved in port area determination, also in the rare case you use damping for your box, port area requirements are different. Link to comment Share on other sites More sharing options...
stingray72 Posted October 19, 2022 Author Report Share Posted October 19, 2022 The box volume is 3.50 cf gross tuned to 35 hz with no dampening. The two subs are .16 per sub. 50 square inches of slot port for two dc sounds lvl 4 12's on 3000 watts split between the two. Link to comment Share on other sites More sharing options...
stingray72 Posted October 19, 2022 Author Report Share Posted October 19, 2022 I asked my brother who used to be sponsored by dc audio and he said 50 isnt enough port area but i asked him if 75 would be enough and he said yes so thats what im going with. Link to comment Share on other sites More sharing options...
stingray72 Posted October 19, 2022 Author Report Share Posted October 19, 2022 1 hour ago, stingray72 said: I asked my brother who used to be sponsored by dc audio and he said 50 isnt enough port area but i asked him if 75 would be enough and he said yes so thats what im going with. This goes right along with Triticum Agricolam's port calculations since im essentially at 3.00 cf (3.11 after all displacements). From my calculations that should put me at about 21ms air velocity. Link to comment Share on other sites More sharing options...
Joe X Posted October 19, 2022 Report Share Posted October 19, 2022 Using 3 cubic feet as net volume you get 25.3 m/s on those conditions, so yes 50 square inches of port area is enough and 75 won't hurt you at all. Link to comment Share on other sites More sharing options...
stingray72 Posted October 19, 2022 Author Report Share Posted October 19, 2022 10 minutes ago, Joe X said: Using 3 cubic feet as net volume you get 25.3 m/s on those conditions, so yes 50 square inches of port area is enough and 75 won't hurt you at all. Are you saying 25.3 with 50 square inches? if so thats great because i needed to shrink down to get it in my trunk. Link to comment Share on other sites More sharing options...
Joe X Posted October 19, 2022 Report Share Posted October 19, 2022 Correct, round the inner edges of the port and keep port area ratio below 6:1 and you are good with 50 square inches. Link to comment Share on other sites More sharing options...
stingray72 Posted October 20, 2022 Author Report Share Posted October 20, 2022 Thanks i appreciate all your help. Link to comment Share on other sites More sharing options...
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