Fiberglass Enclosure Build Pictures - Need Help Tuning Port
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New member Username: 3oo2nvPost Number: 1 Registered: May-08 | Well I am almost done building my enclosure, and it was built to be ported, each chamber is about 2.1 cubic ft. The subs will be mounted inverted so port clearance wont be an issue. I also wont have to account for driver displacement. I have a few questions though. I want to tune the box at 40hz, and I was originally looking to do circle ports as they would be a lot easier to incorporate into the fiberglass enclosure. I talked to the Kicker Tech Group today and initially they recommended a square port. As far as tuning and sound quality go, are there any major differences between circle and square ports? Looking for advice for port location and diameter/depth too. Any advice would be appreciated! Enjoy the pics. http://img382.imageshack.us/img382/5251/0419081751nt6.jpg http://img521.imageshack.us/img521/97/0420081541zr9.jpg http://img187.imageshack.us/img187/5756/0420081830lf3.jpg http://img371.imageshack.us/img371/5216/0429080747vb2.jpg http://img209.imageshack.us/img209/3930/0430082152ke7.jpg http://img362.imageshack.us/img362/8376/0504081808xg6.jpg http://img140.imageshack.us/img140/5822/0504081927al7.jpg http://img258.imageshack.us/img258/130/0507082018pz7.jpg http://img211.imageshack.us/img211/8541/0507082038vw9.jpg http://img530.imageshack.us/img530/2255/48047944kc4.jpg http://img156.imageshack.us/img156/875/61346667my9.jpg |
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Platinum Member Username: WingmanaliveA pic is worth 1000 posts!! Post Number: 16677 Registered: Jun-06 | That's a lot of work. Good effort. You really should've considered port design into the box before you began tho. I've never used a square port so I can't compare SQ between square and round. |
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Silver Member Username: Surferdude9371Im BTL Bumpin Post Number: 931 Registered: Mar-07 | cant help you out with the port but wanted to say that it looks great bud |
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Gold Member Username: InsearchofbassPost Number: 9242 Registered: Jun-04 | two four inch round ports per chamber 18 inches long will give you a 40 hz port tune...you should be ok for up to 1000 watts rms per sub with that port area |
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Platinum Member Username: Rovin1 15 = 149.1DBsTrinidad & T... Post Number: 13776 Registered: Jul-05 | hey thats alot of good work u went through i like sean's idea of using aeroports ... |
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Gold Member Username: InsearchofbassPost Number: 9243 Registered: Jun-04 | well aero ports would be better but I didnt know if he wanted to spend for them...so I suggested standard four inch pvc ports...you can buy aero ports for 12.50 each if you buy four https://www.amazon.com/Precision-Port-Inch-Flared-Tube/dp/B0002ZPR56 (copy and paste the link it will work)...they are only 17 inches long but flares give the port a longer length than a standard 4 inch pvc port |
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Platinum Member Username: Rovin1 15 = 149.1DBsTrinidad & T... Post Number: 13778 Registered: Jul-05 | ^o i c - cool even if it needs to be 18" he can compromise for 17" & a slightly higher tuning (maybe 1 or 2 hz) if he chooses ....  |
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Gold Member Username: Mike11202DD9515G VFL 200.1 = : , Sewell, NJ US Post Number: 1714 Registered: Nov-06 | |
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New member Username: 3oo2nvPost Number: 2 Registered: May-08 | Those are actually the ports I am looking at purchasing. The PSP Ports. They look and sound like great products. Just out of curiosity, is there a reason I should do two 4"x18 ports as opposed to one 5"x13 port. Is there an advantage to doing longer or multiple ports? Also, does port location matter at all? I was originally looking at doing them on the back side but was told this may cancel out as the driver is pointed the opposite way. Any ideas? |
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New member Username: 3oo2nvPost Number: 3 Registered: May-08 | Mike, funny you mention FiberglassForums, I already posted this project there. There's actually a lot more pictures located there if you guys are interested. I couldn't get any response about my port questions though. I figured there would be more experts on that here.  |
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Gold Member Username: Mike11202DD9515G VFL 200.1 = : , Sewell, NJ US Post Number: 1715 Registered: Nov-06 | I prefer circular precision ports but try www.diymobileaudio.com |
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Gold Member Username: Mike11202DD9515G VFL 200.1 = : , Sewell, NJ US Post Number: 1716 Registered: Nov-06 | "Also, does port location matter at all? I was originally looking at doing them on the back side but was told this may cancel out as the driver is pointed the opposite way. Any ideas?" For your trunk car, sub back port to the back left side is usually the loudest option. I'm not really sure since you have seperate chambers and would have to point 1 right and 1 left. |
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Gold Member Username: Big_edge_headMilwaukee, Wisconsin Post Number: 2183 Registered: Mar-07 | Wow. That looks like it was a lot of work. Awesome job!  |
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New member Username: 3oo2nvPost Number: 4 Registered: May-08 | "For your trunk car, sub back port to the back left side is usually the loudest option." I'm still trying to figure out what this means, and I'm not having any luck. lol |
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Gold Member Username: Safe_crackerChicago, IL US Post Number: 4528 Registered: Jan-06 | Honestly the way it is shaped I would just write it off as a sealed enclosure and just gain from the experience. If you want a ported I would go with a dual center slot (between subs) and add some more layers of glass, maybe some bracing? Aeros are great but take up A LOT of room, just a thought...Polo. |
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New member Username: 3oo2nvPost Number: 6 Registered: May-08 | This enclosure is lined with Nylon rope skeleton soaked in fiberglass resin (pics below) and has 6 layers of fiberglass mat in the thinnest areas. It has plenty of air space and strength to be ported, thats what I built it for. The only question I really needed answers for are if port shape and location make a significant difference. From what I have heard, as long as the ports don't face the direct opposite way as the drivers, location doesn't really matter. But I just wanted to confirm this. http://img509.imageshack.us/img509/8008/0509082007ya5.jpg http://img160.imageshack.us/img160/186/0509082007act0.jpg http://img164.imageshack.us/img164/2031/0509082007bxx6.jpg Thanks for the comments and suggestions. |
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Gold Member Username: Safe_crackerChicago, IL US Post Number: 4533 Registered: Jan-06 | Even with that rope, it will flex, it is fiberglass and is in no way rigid. It will work fine as a sealed enclosure but the way the box is shaped, and the way it is seated into the trunk there really isn't much room that will allow the proper porting the subs will require. You should have figured out the port configuration before you started to lay the glass. JMHO...Polo. |
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Gold Member Username: BernymacCambodia Post Number: 3955 Registered: Sep-04 | nice, i think i saw this build on fiberglassforums.com. |
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Gold Member Username: InsearchofbassPost Number: 9259 Registered: Jun-04 | "is there a reason I should do two 4"x18 ports as opposed to one 5"x13 port." you would have way too much port velocity (too much air trying to flow out of the port)...and I didnt check but the port tune might not be the same either...also you probably wont find a 5 inch port anyway...ive never seen one |
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New member Username: 3oo2nvPost Number: 7 Registered: May-08 | Gotcha, thanks man! |
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New member Username: 3oo2nvPost Number: 8 Registered: May-08 | What about making an L-shaped tubular port by cutting the PVC at a 45* angle and attaching in a L shape with the exit of the port being attached at the top back side of the box, and the port entrance facing the bottom of the box on the interior. See Picture for Reference... http://img396.imageshack.us/img396/3862/portdesignxi3.jpg |
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New member Username: 3oo2nvPost Number: 9 Registered: May-08 | Ill try this again   |
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Gold Member Username: Kpa2727Old Bridge, NJ USA ! Post Number: 1270 Registered: May-07 | "For your trunk car, sub back port to the back left side is usually the loudest option." "I'm still trying to figure out what this means, and I'm not having any luck. lol" i believe mikes refering to the loading of the box in the trunk leading to a few db gain. meaning that it will be the loudest options. |
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Gold Member Username: InsearchofbassPost Number: 9286 Registered: Jun-04 | that will work just try to give the port entrance at least 4 inches from the wall of the box internally |
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Silver Member Username: Yukhui4 15 AA Havocs, Memphis 4kw!! Post Number: 929 Registered: Jan-06 | I would keep it sealed. You just don't quite have the box size necessary for a good ported box. |
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