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Enclosure Design & Construction
Twin 18" PA-Sub 6th-Order Blowthrough in Trunk... Sanity Check.
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<blockquote data-quote="Buck" data-source="post: 8724632" data-attributes="member: 591582"><p>Usually when i do 6th orders like that it's for really low end bass. Sometimes it's not. But just the way things peak with rap, that's why I do them like I do. I put that bigger chamber in the front to boost certain ranges, depends on the vehicle and things like the Fs of the sub and how far I would expect the box to be loud at in higher frequencies,</p><p></p><p>Like I said, the rear chamber is really what matters. The front chamber is significantly less important. The ratio between the rear and front is largely irrelevant, I just look at each chamber and what I need out of it. And sometimes I have to make that front chamber a little larger just to have everything fit inside of it. But you're right in general there about what you've said, IMO.</p><p></p><p>There is quite a benefit to having a large front chamber as well, so you can have a large radiating surface without having a port a mile long. Some of my front chambers are tuned to 45 hz. That really comes into play with a 10,000 watt wall like this, notice that the front chamber almost barely qualifies as a series 6th. This front chamber is tuned higher than 45 hz, I don't remember exactly what it was. Like 55/60 hz maybe. That loading wall is basically just that, it technically is tuned very specifically, but it's purpose is more to have a collected singular radiating surface. You try to make a port work for a 10,000w wall with a tiny front chamber.....it's very difficult to do without giving the front chamber some beefy size, so much air coming through that front port: [MEDIA=youtube]DptnUkTHbts[/MEDIA]</p><p></p><p>But yeah I didn't realize you had 3.5 cubes per in the rear. That might be alright if you aren't trying to play much below 40, like you were saying. I tend not to trust modeling software or t/s parameters in general. I use them as an aid, but man I've seen too much t/s BS (lol) to know not to trust every response curve I see. See, most of my customers want to play in the mid 20's with their walls, so our designs are definitely going to look different. That's what I love about series 6th orders....you can make them do whatever you want. There's so many options.</p><p></p><p>I do need to get back into hornsrep. I was going to learn how to do hornsrep well and tapered t-lines and horns and stuff like that, just like nobody ever wants those. I've thought about my own calculations to do horns just based off certain ratios without even using a program. Just haven't had a reason to, really. So that would some of the stuff I'd actually have to learn how to do is horns and any kind of non-equal width or surface area port. I've barely played with it, so you may be ahead of me in some ways if you know how to do that.</p></blockquote><p></p>
[QUOTE="Buck, post: 8724632, member: 591582"] Usually when i do 6th orders like that it's for really low end bass. Sometimes it's not. But just the way things peak with rap, that's why I do them like I do. I put that bigger chamber in the front to boost certain ranges, depends on the vehicle and things like the Fs of the sub and how far I would expect the box to be loud at in higher frequencies, Like I said, the rear chamber is really what matters. The front chamber is significantly less important. The ratio between the rear and front is largely irrelevant, I just look at each chamber and what I need out of it. And sometimes I have to make that front chamber a little larger just to have everything fit inside of it. But you're right in general there about what you've said, IMO. There is quite a benefit to having a large front chamber as well, so you can have a large radiating surface without having a port a mile long. Some of my front chambers are tuned to 45 hz. That really comes into play with a 10,000 watt wall like this, notice that the front chamber almost barely qualifies as a series 6th. This front chamber is tuned higher than 45 hz, I don't remember exactly what it was. Like 55/60 hz maybe. That loading wall is basically just that, it technically is tuned very specifically, but it's purpose is more to have a collected singular radiating surface. You try to make a port work for a 10,000w wall with a tiny front chamber.....it's very difficult to do without giving the front chamber some beefy size, so much air coming through that front port: [MEDIA=youtube]DptnUkTHbts[/MEDIA] But yeah I didn't realize you had 3.5 cubes per in the rear. That might be alright if you aren't trying to play much below 40, like you were saying. I tend not to trust modeling software or t/s parameters in general. I use them as an aid, but man I've seen too much t/s BS (lol) to know not to trust every response curve I see. See, most of my customers want to play in the mid 20's with their walls, so our designs are definitely going to look different. That's what I love about series 6th orders....you can make them do whatever you want. There's so many options. I do need to get back into hornsrep. I was going to learn how to do hornsrep well and tapered t-lines and horns and stuff like that, just like nobody ever wants those. I've thought about my own calculations to do horns just based off certain ratios without even using a program. Just haven't had a reason to, really. So that would some of the stuff I'd actually have to learn how to do is horns and any kind of non-equal width or surface area port. I've barely played with it, so you may be ahead of me in some ways if you know how to do that. [/QUOTE]
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