lagexe Posted January 20, 2012 Report Share Posted January 20, 2012 (edited) This is my newest design. but I don't know if I should make it .75" wider and add a piece of MDF to give each sub it's own chamber, or port, or both chamber and port. What would be best? Mono 2400rms @ 1ohm 33hz, Fi SSD 15". Edited January 20, 2012 by lagexe Quote Link to comment Share on other sites More sharing options...
bkolfo4 Posted January 20, 2012 Report Share Posted January 20, 2012 You can sometimes have issues with unequal excursion between the 2 subs if you have them on one side of the baffle and the port on the other. One chamber is fine, but if you are just building it for daily, put the port in the middle of the box between the 2 subs. you might lose a very small amount of SPL, but it will not be noticable. Quote Current system: 1997 Blazer - (4) Customer Fi NEO subs with (8) American Bass Elite 2800.1s Previous systems: 2000 Suburban - (4) BTL 15's and (4) IA 40.1's = 157.7 dB at 37 Hz. 1992 Astro Van - (6) BTL 15's and (6) IA 40.1's = 159.7 dB at 43 Hz. Link to comment Share on other sites More sharing options...
lagexe Posted January 20, 2012 Author Report Share Posted January 20, 2012 You can sometimes have issues with unequal excursion between the 2 subs if you have them on one side of the baffle and the port on the other. One chamber is fine, but if you are just building it for daily, put the port in the middle of the box between the 2 subs. you might lose a very small amount of SPL, but it will not be noticable. I'm new to making boxes, how do I put them in the same chamber, but with a port between them? Quote Link to comment Share on other sites More sharing options...
Joe X Posted January 20, 2012 Report Share Posted January 20, 2012 If you do separate chambers you will need two ports, is a bit harder to build and and a larger box but because drivers can't load each other (due to individual tolerances) some energy is saved and some better sound quality is achieved, some people use separate chambers because of this, at least one kicker box design document also support the use of separate chambers. The center divider provides some "natural" bracing also. Quote Link to comment Share on other sites More sharing options...
lagexe Posted January 20, 2012 Author Report Share Posted January 20, 2012 (edited) If you do separate chambers you will need two ports, is a bit harder to build and and a larger box but because drivers can't load each other (due to individual tolerances) some energy is saved and some better sound quality is achieved, some people use separate chambers because of this, at least one kicker box design document also support the use of separate chambers. The center divider provides some "natural" bracing also. I had a lot of trouble understanding some of this, but it sounds like are saying: 2-chambers, 2-ports? Edited January 20, 2012 by lagexe Quote Link to comment Share on other sites More sharing options...
Joe X Posted January 20, 2012 Report Share Posted January 20, 2012 Yes 2 chambrs - 2 ports for the reasons explained. I have not seen equations to model port tuning for a 2 chamber single center port design. As for a single chamber center slot port it can be easily done IF the port does not turn. Quote Link to comment Share on other sites More sharing options...
rogue Posted January 20, 2012 Report Share Posted January 20, 2012 can do basically two chambers that the ports combine to one. each port individual having half the surface area of the port it will become common with. Quote BMW X5 Stealth Build w/ IPAD BMW 325i Rear Deck Digital Designs Build BMW 325i Car PC Touchscreen Bezel Build Link to comment Share on other sites More sharing options...
lagexe Posted January 20, 2012 Author Report Share Posted January 20, 2012 K if took a box with this design and separated the chambers and where the ports meet, I will be good? I use the Torres Calculator (as best I can). It's given me the manufactors desired tuning and airspace.: Pretend there is some MDF in the middle of the box dividing it. That is an old design. Quote Link to comment Share on other sites More sharing options...
rogue Posted January 20, 2012 Report Share Posted January 20, 2012 this is easier as a pic than it will be in words but this is what i was trying to say in my previous post. box by rogueauto, on Flickr Quote BMW X5 Stealth Build w/ IPAD BMW 325i Rear Deck Digital Designs Build BMW 325i Car PC Touchscreen Bezel Build Link to comment Share on other sites More sharing options...
Joe X Posted January 20, 2012 Report Share Posted January 20, 2012 this is easier as a pic than it will be in words but this is what i was trying to say in my previous post. box by rogueauto, on Flickr Yeah, I have seen those but because the air speed lowers on the common center duct an there's a lot of turbulence on the T I think the standard equation will not predict accurately tuning and I expect lower sound quality on such port design, to me just placing a center divider there makes things more predictable. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.