Posted April 24, 200916 yr Ok guys I finally got everything in so Im having my box built early next week. Here is a Design below for my 2 18" Level 4 XL's:D. Its going in my 03 Gmc Sierra Ext. Cab taking the back seat out for this. Specs are 190 3/4 sqin port area tuned @ 33 hz and is 11.27cuft after displacementsEverything thats going in the truck Plus 2 Large batteries and the MLA module which are not in the picturedAnd the actual truckI will update with pics when the box is being built..
April 24, 200916 yr That back wall is going to flex something horrible with the port going all the way across. Make sure you brace it well.
April 26, 200916 yr your port's cross sectional area is 54.5" by 3.5", which gives a ratio 15.57 to 1!The ratio of W to h should not be any more than 9 to 1 to prevent tuning shifts introduced by excessive friction between the rapidly moving air and the port's surface. It should be noted that this is not a hard-and-fast rule, merely a rule of thumb to help you prevent a mis-tuning. In short, keep the port as square as aesthetically and physically possible.takes from JL tech section.. personally, i try not to cross 6:1 when designing ports..nice truck, nice subs and nice amp btw!
May 7, 200916 yr Author DAMN.. THAT LOOKS CLEAN!!Thanks that rhino liner looks a million times better than carpet imo
May 10, 200916 yr Author Thanks guys^^Here a quick vid I made volume was at 21 on a Pioneer Hu. I'll have more monday after I get it tuned.
May 11, 200916 yr Are you using the stock alt? I have the same truck and was wondering if i would need to get a stock alt if i upgrade. I have the 4.8L v8, is this what you have?
May 11, 200916 yr nice video do have any dynamat on the roof?what about the flex from the back window aren't you worried getting it loose then the worst thing fall and break this might look getto or whatever but i put tennis balls on mine between the cab and the box so is harder to flex Edited May 11, 200916 yr by XxedgarxX
May 11, 200916 yr Author Are you using the stock alt? I have the same truck and was wondering if i would need to get a stock alt if i upgrade. I have the 4.8L v8, is this what you have?Im am using a stock alt for now. I have a 4.8 V8 as well.
May 11, 200916 yr Author nice video do have any dynamat on the roof?what about the flex from the back window aren't you worried getting it loose then the worst thing fall and break this might look getto or whatever but i put tennis balls on mine between the cab and the box so is harder to flexNo dynamat at all. Idk why but it seems like the 99 and older trucks are a lil more flimsy and the 99 and newer are a lil more solid. Cause I know someone with a 94 Silverado and 1 18" and it flexes between the cab and the bed of the truck bad and he puts tennis balls there. Mine does flex but sounds more solid and hits hard.. Im turning the gain up today and tuning it so I'll have more vids:)
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