lj7802 Posted April 17, 2020 Report Share Posted April 17, 2020 im building a 4th order bandpass 1ST one im using Alpine Type-R 12" (R-W12D4) hoping to get some feedback on the design i came up with any changes i should make any help i can get would be much apreaciated. the port dimensions are 4.5" x 16" and the length is 6" with baskets/magnent in the ported chamber . Link to comment Share on other sites More sharing options...
1point21gigawatts Posted April 17, 2020 Report Share Posted April 17, 2020 What’s it tuned to? “How can we help you?” “And don’t forget to tell them that the customer isn’t always right.” Link to comment Share on other sites More sharing options...
lj7802 Posted April 17, 2020 Author Report Share Posted April 17, 2020 51Hz with 72sq in, port area and just under 15sq in, port area per foot is what i came up with, first 4th order box but im pretty sure im doing it right Link to comment Share on other sites More sharing options...
1point21gigawatts Posted April 18, 2020 Report Share Posted April 18, 2020 Tune it closer to 45hz-50hz. Not above. Not even a little. I would recommend around 45hz and 47hz. “How can we help you?” “And don’t forget to tell them that the customer isn’t always right.” Link to comment Share on other sites More sharing options...
1point21gigawatts Posted April 18, 2020 Report Share Posted April 18, 2020 Plus that port is too small for the cone area of them subwoofers and it’s too rectangular “How can we help you?” “And don’t forget to tell them that the customer isn’t always right.” Link to comment Share on other sites More sharing options...
1point21gigawatts Posted April 18, 2020 Report Share Posted April 18, 2020 With 4th order enclosures, the port area is suppose to around half the total cone area of the subwoofers and closest to a square as you can get it. A rectangle will be ok but not as rectangular as you have it. Slots don’t work as well as squares with 4th order enclosures. “How can we help you?” “And don’t forget to tell them that the customer isn’t always right.” Link to comment Share on other sites More sharing options...
1point21gigawatts Posted April 18, 2020 Report Share Posted April 18, 2020 2 12” subwoofers cone area is like 226”. So the port area has to be about 113” “How can we help you?” “And don’t forget to tell them that the customer isn’t always right.” Link to comment Share on other sites More sharing options...
1point21gigawatts Posted April 18, 2020 Report Share Posted April 18, 2020 The port area you have now is 72” “How can we help you?” “And don’t forget to tell them that the customer isn’t always right.” Link to comment Share on other sites More sharing options...
1point21gigawatts Posted April 18, 2020 Report Share Posted April 18, 2020 14”x8”=112” (my recommendation) 16”x7”=112” (alternative) “How can we help you?” “And don’t forget to tell them that the customer isn’t always right.” Link to comment Share on other sites More sharing options...
1point21gigawatts Posted April 18, 2020 Report Share Posted April 18, 2020 27 minutes ago, lj7802 said: 51Hz with 72sq in, port area and just under 15sq in, port area per foot is what i came up with, first 4th order box but im pretty sure im doing it right You’re using the wrong science for designing a 4th order. The port area has nothing to do with any of the chamber sizes, just the subwoofer size(s). “How can we help you?” “And don’t forget to tell them that the customer isn’t always right.” Link to comment Share on other sites More sharing options...
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