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How to do a blowthrough correctly?
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<blockquote data-quote="SWFL" data-source="post: 6104274" data-attributes="member: 607847"><p>Yea, well its paid off so I figured why not, plan to make it into a project. its a 01 and only 90k miles on it so hell still has low miles for a going on 9 year old truck only 10k miles a year average. Truck is in great shape. So I figured why not.</p><p></p><p>the bed dimensions are around 65x41x22 or 65x(42 maybe 42) x22</p><p></p><p>or I can do 65x48x20</p><p></p><p>so after just say 3/4 MDF might need double not sure just say one layer</p><p></p><p>that will be after MDF disp and plan to prob take 10" off for room in the back by the tailgate for battery and amp rack so</p><p></p><p>55x41x22=25 cu ft</p><p></p><p>55x42x22=25.7 cu ft</p><p></p><p>or 55x48x20=26.6 cu ft</p><p></p><p>Prob would do the 55x41x22 so I can get the 22" high and make sure it will fit and not worry bout stertching it to 42 to pick up .7 cu ft extra. Also with the 22 height i can do 18's even if i do 2 layers of wood. with only 20" high that limits me to 15's only</p><p></p><p>so 55x41x22 would be the best bet could even make it longer if needed to depends on how much room i need for a battery bank. Will have room on the sides as well for batterys since this box will go inbetween the wheel wells and another 7" inside of the wheel well so I will have around 10" wide in 4 spots so I could put 4 batteries in those spots would rather have them all in the back. so could just take off 8" for the battery bank most batteries are that wide anyway right and that would give me</p><p></p><p>57x41x22=26.3</p><p></p><p>IDK how much room I will have after the port displacement and loading chamber and all that good stuff, need a builder to give me a little help. If I did 4 18's I would need 2 layers of wood so would be 22.5 cu ft before sub or port displacement after 4 18's that will be down to 21.5 cubes. so i doubt i can do 4 18's. that leaves 5.4 per sub if before any port so 18's are out of the question right??</p><p></p><p>if I did one layer would give me 26 after subs 25 cu feet and that would leave 6.25cu ft for each 18 before any port still not enough I am assuming 18's need at least 5-6 cu ft per sub after port right</p><p></p><p>15s are my subs I figure would be the best to go with prob 4 15's or 6 15's w/e I can fit</p><p></p><p>more than likely a 15 will need 3.5 cubes after port so with 4 will need around 14 cubes after port and with 6 will need around 21 after port. if i am doing 15's i can do the box thats 55x48x20 that gives me 26.6 before displacement after subs will have 25.5 so I dont think the 6 15's taking up 21 cu feet leaving 4 cu feet for port so 4 15's would be the best best. 14 cu ft for subs and leave another 11-12cu ft for port and loading chamber</p><p></p><p>kinda long I know but wanted to see if anyone see what i am saying</p></blockquote><p></p>
[QUOTE="SWFL, post: 6104274, member: 607847"] Yea, well its paid off so I figured why not, plan to make it into a project. its a 01 and only 90k miles on it so hell still has low miles for a going on 9 year old truck only 10k miles a year average. Truck is in great shape. So I figured why not. the bed dimensions are around 65x41x22 or 65x(42 maybe 42) x22 or I can do 65x48x20 so after just say 3/4 MDF might need double not sure just say one layer that will be after MDF disp and plan to prob take 10" off for room in the back by the tailgate for battery and amp rack so 55x41x22=25 cu ft 55x42x22=25.7 cu ft or 55x48x20=26.6 cu ft Prob would do the 55x41x22 so I can get the 22" high and make sure it will fit and not worry bout stertching it to 42 to pick up .7 cu ft extra. Also with the 22 height i can do 18's even if i do 2 layers of wood. with only 20" high that limits me to 15's only so 55x41x22 would be the best bet could even make it longer if needed to depends on how much room i need for a battery bank. Will have room on the sides as well for batterys since this box will go inbetween the wheel wells and another 7" inside of the wheel well so I will have around 10" wide in 4 spots so I could put 4 batteries in those spots would rather have them all in the back. so could just take off 8" for the battery bank most batteries are that wide anyway right and that would give me 57x41x22=26.3 IDK how much room I will have after the port displacement and loading chamber and all that good stuff, need a builder to give me a little help. If I did 4 18's I would need 2 layers of wood so would be 22.5 cu ft before sub or port displacement after 4 18's that will be down to 21.5 cubes. so i doubt i can do 4 18's. that leaves 5.4 per sub if before any port so 18's are out of the question right?? if I did one layer would give me 26 after subs 25 cu feet and that would leave 6.25cu ft for each 18 before any port still not enough I am assuming 18's need at least 5-6 cu ft per sub after port right 15s are my subs I figure would be the best to go with prob 4 15's or 6 15's w/e I can fit more than likely a 15 will need 3.5 cubes after port so with 4 will need around 14 cubes after port and with 6 will need around 21 after port. if i am doing 15's i can do the box thats 55x48x20 that gives me 26.6 before displacement after subs will have 25.5 so I dont think the 6 15's taking up 21 cu feet leaving 4 cu feet for port so 4 15's would be the best best. 14 cu ft for subs and leave another 11-12cu ft for port and loading chamber kinda long I know but wanted to see if anyone see what i am saying [/QUOTE]
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