Daddy_ Posted January 25, 2013 Report Share Posted January 25, 2013 Ok I might sound like a noob here but what are 4th, 5th, 6th, 7th order boxes? I know there sealed and ported boxes but what do the numbers represent? Also what are the advantages and disadvantages of having them instead of a seal and ported box? Car: 2012 Acura TL Elite Head Unit: JL Audio Fix86 Front Stage : Alpine SPX-17PRO Rear Stage : Alpine SPR-60C Component Amp : JL Audio HD 600/4 Sub : 1 12" JL Audio W7 Sub Amp : JL Audio HD 1200 Link to comment Share on other sites More sharing options...
ToNasty Posted January 25, 2013 Report Share Posted January 25, 2013 4th order plays the lows (like a sealed) and the higher notes 30-50's (like ported). thats how it was explainned to me. it has a wider playing range ***Super Sellers List***http://www.stevemeadedesigns.com/board/topic/25829-super-sellers-buyers Link to comment Share on other sites More sharing options...
Daddy_ Posted January 25, 2013 Author Report Share Posted January 25, 2013 4th order plays the lows (like a sealed) and the higher notes 30-50's (like ported). thats how it was explainned to me. it has a wider playing range Alright thats understandable but what do the number mean like 4th, 5th, 6th, 7th order. So you get the best if both worlds but I dont see many people doing it with like 2 12". Usually how big of a box are these boxes with like 2 10s or 2 12s Car: 2012 Acura TL Elite Head Unit: JL Audio Fix86 Front Stage : Alpine SPX-17PRO Rear Stage : Alpine SPR-60C Component Amp : JL Audio HD 600/4 Sub : 1 12" JL Audio W7 Sub Amp : JL Audio HD 1200 Link to comment Share on other sites More sharing options...
Carbon Posted January 25, 2013 Report Share Posted January 25, 2013 Search Link to comment Share on other sites More sharing options...
ToNasty Posted January 25, 2013 Report Share Posted January 25, 2013 There's 4th 6th and 8th. I.don't.know about anymore than that. I'm not sure what the number.meens And you usually want a 1:2 or 1:3 ratio of sealed to portef ***Super Sellers List***http://www.stevemeadedesigns.com/board/topic/25829-super-sellers-buyers Link to comment Share on other sites More sharing options...
Carbon Posted January 25, 2013 Report Share Posted January 25, 2013 Look: http://www.stevemead...pass-enclosure/ This is my quick write up on 4th order bandpass boxes. I want to keep it simple and sweet! Hope this helps a lot of new people!!! I'm not a expert but from my research this is what I believe is best. I wouldn't mine if someone has more to add! A 4th order is simpler then it seems... You have a sealed section witch develops the lower frequencies and a ported section that develops the high end frequencies. The advantage to this type of box is you get the tight clean bass everyone loves from a sealed box but with a wider range of frequencies and higher output! There are a couple of awesome programs out there that help with the design of a 4th order. My personal favorite is bass box pro 6. You can get it for around $150 at parts-express.com. If you do a lot of car audio or home audio this is well worth the investment!!! Main thing to remember is the ratio of the box. Most 4th orders are a 2:1 ratio this means for every 2 cubic ft of ported section there is 1 cubic ft of sealed. So if your sub needs 1.5 cubic ft sealed then your ported section is going to be 3 cubic ft.. Some people do 3:1 but most commonly you'll find 2:1 works out best. At least I have so far. I start the design with the sealed section of the box. I normally design the sealed section around the recommended specs from the subwoofer manufacture! A 12" will normally need between .8 and 1.5 cubic ft in the sealed section! remember the sealed portion makes the low end bass so the lower the f3 the better lol but normally I set it near the fs of the subwoofer! The second section of the box is the ported witch plays the higher end bass. As stated above with a ratio of 2:1 for ported section should be double the air space of the sealed section! Unlike normal ported boxes your not going to tune this low! In fact kind of high... The best (IMO) is between 45hrz-50hrz. Now here is where it gets fun... Your subwoofer needs to come from the sealed section facing into the ported section. Since the woofer will be completely inside the box the more port area the better! That's where your sound will come from! I try to aim around 15sqin PER CUBIC FOOT! I say it nice and big because I myself forget sometimes and have to go back and redesign lol! From what I have read The shorter the port the better but that's not a big issue since tuning high normally means a short port. Since your subwoofer needs to be inside the enclosure the best thing is to include a removable front panel in your design. I did mine with the face of the box. Another thing you may want to do is face the woofer into the sealed section so the motor and basket are in the ported section so you can smell if the coils burning! I trust my self not to fry anything so I leave it facing the ported section plus IMO its easier to calculate the displacement in the sealed and it keeps the ported section a little smaller! Hope I covered everything and it helps the new comers! Link to comment Share on other sites More sharing options...
Daddy_ Posted January 25, 2013 Author Report Share Posted January 25, 2013 Alright that helped a lot. I am wanting to do something similair to this video but not sure if its a 4th order box. Car: 2012 Acura TL Elite Head Unit: JL Audio Fix86 Front Stage : Alpine SPX-17PRO Rear Stage : Alpine SPR-60C Component Amp : JL Audio HD 600/4 Sub : 1 12" JL Audio W7 Sub Amp : JL Audio HD 1200 Link to comment Share on other sites More sharing options...
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