Ernest Posted June 26, 2017 Report Share Posted June 26, 2017 I'm needing assistance on how to determine the size of the 2 chambers. Do I take the largest recommend volume of 8 cf and split it up into...6 cf @ 28hz and 2 cf @ 55hz to reach a final volume of 8 cf? Or is the way to desighn the boxes to take one chamber at 8cf @ 28 hz then keep the other chamber with in the smallest recommendation of 5cf @ 55hz and have a final volume of 13cf ? It seems to me like the latter would unload very easily. Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted June 26, 2017 Report Share Posted June 26, 2017 I suggest sizing the low chamber as large as you can but still keeping excursion acceptable based on how much power you will be running. The high chamber is then sized/tuned to get the frequency response you desire. Using simulation software (WindISD, etc) is mandatory IMHO. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
Ernest Posted June 26, 2017 Author Report Share Posted June 26, 2017 Ok,thanks I was leaning towards having to do some type of modeling. I just was not sure on chamber size's, in other words it's not "just throw it in a box and tune it",I need to model each individual chamber. "What modeled best for 28hz then what works best for 55hz" THEN combine the 2 in 1 box. What is the relationship between the 2 tuning's, isn't an "octave apart" have a "great deal" to do with the tuning's? Also what about keeping the port area the same for both chambers?....I am wanting to learn. And may be building a cheap test box just to experiment. Sorry for so many questions lol Link to comment Share on other sites More sharing options...
Jessica Posted June 26, 2017 Report Share Posted June 26, 2017 Winisd beta will show you how all that will work. Just takes some time to learn how to use it Rest in peace, walled 87 accord build log 03' Corolla build with AA Mayhem inside. My super random youtube channel and terrible camera work. Wiring comparison by CaptainzPlanetz Wire and fuse guide by Guest SyKo13 Link to comment Share on other sites More sharing options...
rocking.that.eclipse Posted June 26, 2017 Report Share Posted June 26, 2017 50 minutes ago, Ernest said: Ok,thanks I was leaning towards having to do some type of modeling. I just was not sure on chamber size's, in other words it's not "just throw it in a box and tune it",I need to model each individual chamber. "What modeled best for 28hz then what works best for 55hz" THEN combine the 2 in 1 box. What is the relationship between the 2 tuning's, isn't an "octave apart" have a "great deal" to do with the tuning's? Also what about keeping the port area the same for both chambers?....I am wanting to learn. And may be building a cheap test box just to experiment. Sorry for so many questions lol I would take your chamber that is for the lows and tune it to spec for the teams for cone control. Then go with 2 or 3 times as large for highs side (depending on the ratio you want) and then tune what you want your other peak to be. That's how I did my 6th and it played anything and everything I wanted. Also helped with a few other ones Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted June 26, 2017 Report Share Posted June 26, 2017 29 minutes ago, rocking.that.eclipse said: I would take your chamber that is for the lows and tune it to spec for the teams for cone control. Then go with 2 or 3 times as large for highs side (depending on the ratio you want) and then tune what you want your other peak to be. That's how I did my 6th and it played anything and everything I wanted. Also helped with a few other ones Ratios don't really apply to parallel-tuned 6th order boxes. Also the high side is almost always significantly smaller than the low side, its generally the opposite for series-tuned boxes. "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
Ernest Posted June 26, 2017 Author Report Share Posted June 26, 2017 What about keeping port area the same for both chambers? All the parallels I've looked at look like that's the goal Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted June 26, 2017 Report Share Posted June 26, 2017 1 hour ago, Ernest said: Ok,thanks I was leaning towards having to do some type of modeling. I just was not sure on chamber size's, in other words it's not "just throw it in a box and tune it",I need to model each individual chamber. "What modeled best for 28hz then what works best for 55hz" THEN combine the 2 in 1 box. What is the relationship between the 2 tuning's, isn't an "octave apart" have a "great deal" to do with the tuning's? Also what about keeping the port area the same for both chambers?....I am wanting to learn. And may be building a cheap test box just to experiment. Sorry for so many questions lol WinISD can model parallel-tuned 6th order boxes. Its free and fairly easy to use. You can get the newest version here: http://www.linearteam.org/download/winisd-07x.exe You generally want the tuning frequencies to about an octave apart, more than that is OK. You can go a little less than an octave if you need, but not much or you will start to get cancellation. As far as port area goes, there is no reason it needs to be the same for both chambers. The important thing is that you have enough port area to keep port velocities reasonable. Here is a port area calculator that can get you in the right area: https://goo.gl/STAv4p "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds: Link to comment Share on other sites More sharing options...
Ernest Posted June 26, 2017 Author Report Share Posted June 26, 2017 Any more tips and tricks would be very valuable to me. I may try one made with cheap wood and brace it up very well. If I don't like the out come I can always just burn it lol Link to comment Share on other sites More sharing options...
Ernest Posted June 26, 2017 Author Report Share Posted June 26, 2017 And thanks for the help fellas I really appreciate it Link to comment Share on other sites More sharing options...
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