ptcary Posted January 2, 2009 Report Share Posted January 2, 2009 Your work is amazing! Very clean. I really like the structure work! If I had seen this post a year ago, I would have seriously considered asking you if I could borrow your design for my PT! PTCary 2003 SMD PT Cruiser 2011 Honda CBR 250R 2010 Mazda 3i Sport MY BUILD LOG Link to comment Share on other sites More sharing options...
The Big Oki Posted January 2, 2009 Author Report Share Posted January 2, 2009 But the topic was here a year ago Cary To the F3... I never calculate like I would have just one drive. I consider the car, the whole system, and what I want to do with it. Usually "just" listening music. Personally I dont car about subsonic, unnatural effects from tooo low tunings. Makes no sense for me to tune something to 20 hz just to say "hey, that is loooow". So there is no real point of f3 for me. Its always different. Calculations are usually made for free field measurements or applications, in cars you have to add the car itself, the pressure chamber effekt and so on. (I guess you all know that already) and so the frequency responses in my curves look like tuned too high, but when you measure in car, your relatively flat from 24-60 hz (+ - 2dB what makes not a real difference when listening to MUSIC!)and even on 20hz it blows like crazy, always in mind that there are more woofers involved. Its difficult for me to explain the high tunings of my low playing systems Üüüühh!!! Michael www.SQPL.de Rulez! Link to comment Share on other sites More sharing options...
ptcary Posted January 2, 2009 Report Share Posted January 2, 2009 But the topic was here a year ago Cary Ok, but that was before I was here! I think a lot of people would think differently about XPlod if they were to see this, and Cerwin Vega has always been impressive. I really love the structure of that enclosure, very well thought out. I recommended Neo-Frog take a look at this post for his next build in his PT. PTCary 2003 SMD PT Cruiser 2011 Honda CBR 250R 2010 Mazda 3i Sport MY BUILD LOG Link to comment Share on other sites More sharing options...
dr.db Posted January 2, 2009 Report Share Posted January 2, 2009 Bandpass boxes FTW..love your work man. Link to comment Share on other sites More sharing options...
mazdawg Posted January 3, 2009 Report Share Posted January 3, 2009 Bandpass boxes FTW..love your work man. Sorry if ive brought a thread from the dead but i find this very intresting.I will be starting a rebuild of my Chevy in January sometime which at the moment as 12x15'' in a 4th order bandpass which plays real sweet aint the loudest around as a good bandwidth .My new plan is to use 24 x15'' Orion cobalts in a 6th order series tuned and move the wall to the B post which should give me plenty of volume.!! must get over to Germany with some of my fellow Db drag boys this year. The uk,s first 170db Link to comment Share on other sites More sharing options...
BITLD Posted January 3, 2009 Report Share Posted January 3, 2009 I get how Oki's designs work, and agree with him you shouldn't base the end resultant upon 1 driver x then number you have. Its simple when you think about it, the rear chambers are heavily damped from being fairly compact but you build up a great amount of control and reduce the overall Xmax. Your in a sense restraining the excursion. However, the front waves are therefore much more powerful, couple that with a chamber with a decent set of rads for a desired bandwidth and you get a killer setup. The 4th orders i've heard tend to loose out on output when using larger sealed cabs, your reducing the compression with a larger chamber and defeating the object of the effects of 'bandpass' on the suspenion of the driver. Large rear cabs and semi large front makes for just a muddy undefined sound, also at a cost of output. Its fair to say Oki's systems show exactly why a bandpass need not depend on the F3 of the driver. www.BladeICE.com UK/European Distributors Ascendant Audio Fi Car Audio XS Power KnuKonceptz.co.uk Facebook Youtube Channel Link to comment Share on other sites More sharing options...
The Big Oki Posted January 3, 2009 Author Report Share Posted January 3, 2009 Üüüühh!!! Michael www.SQPL.de Rulez! Link to comment Share on other sites More sharing options...
mazdawg Posted January 3, 2009 Report Share Posted January 3, 2009 I get how Oki's designs work, and agree with him you shouldn't base the end resultant upon 1 driver x then number you have. Its simple when you think about it, the rear chambers are heavily damped from being fairly compact but you build up a great amount of control and reduce the overall Xmax. Your in a sense restraining the excursion. However, the front waves are therefore much more powerful, couple that with a chamber with a decent set of rads for a desired bandwidth and you get a killer setup. The 4th orders i've heard tend to loose out on output when using larger sealed cabs, your reducing the compression with a larger chamber and defeating the object of the effects of 'bandpass' on the suspenion of the driver. Large rear cabs and semi large front makes for just a muddy undefined sound, also at a cost of output. Its fair to say Oki's systems show exactly why a bandpass need not depend on the F3 of the driver. It real depends on your personal goals ive made many 4th order bandpass with a small low frequency chamber and no doubt they aer very musical but tend to lose output below 30hz,i agree that a (real large )!!rear chamber 4th order bandpass sound muddy,thats why a 6th order is the way to go for me The uk,s first 170db Link to comment Share on other sites More sharing options...
mazdawg Posted January 3, 2009 Report Share Posted January 3, 2009 I get how Oki's designs work, and agree with him you shouldn't base the end resultant upon 1 driver x then number you have. Its simple when you think about it, the rear chambers are heavily damped from being fairly compact but you build up a great amount of control and reduce the overall Xmax. Your in a sense restraining the excursion. However, the front waves are therefore much more powerful, couple that with a chamber with a decent set of rads for a desired bandwidth and you get a killer setup. The 4th orders i've heard tend to loose out on output when using larger sealed cabs, your reducing the compression with a larger chamber and defeating the object of the effects of 'bandpass' on the suspenion of the driver. Large rear cabs and semi large front makes for just a muddy undefined sound, also at a cost of output. Its fair to say Oki's systems show exactly why a bandpass need not depend on the F3 of the driver. It real depends on your personal goals ive made many 4th order bandpass with a small low frequency chamber and no doubt they aer very musical but tend to lose output below 30hz,i agree that a (real large )!!rear chamber 4th order bandpass sound muddy,thats why a 6th order is the way to go for me The uk,s first 170db Link to comment Share on other sites More sharing options...
BITLD Posted January 4, 2009 Report Share Posted January 4, 2009 From what i've seen, Oki's is a complete monster right down to 20hz. Larger cabs on the rear will loose out and reduce the effect of what you are trying to achieve with a 4th order bandpass. The driver isn't gaining anything from having a larger rear cabs, well very little. Get the front chamber right, it won't roll off @ 30Hz. Okis proves this through and throughout www.BladeICE.com UK/European Distributors Ascendant Audio Fi Car Audio XS Power KnuKonceptz.co.uk Facebook Youtube Channel Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.