passive radiator help on a 6th order

[Papermaker85 5,000+ posts]

I bet you would want to smoke my ass, you peter-puffer!

you didn't play sports?

 

[adulbrich 5,000+ posts]

you didn't play sports?

I've played:

Soccer

T-ball (lol)

Wrestling

Hockey

Football

Track & field

 

[Jroo 10+ year member]

you may want to try diyma or a more sq oriented forum

I have reached out and have a post on diyma. A few are looking at it, but the 6th order is throwing off the modeling.

 

[Jroo 10+ year member]

I've built a few enclosures with pr's and you'll need one 10" pr for each 8" sub.

Being ISO, change the numbers of PRs needed? since you need a 10" PR for an 8, would I need 4 10" PRs because I have 4 8" subs? Could you run 1 PR for each Iso set?

 

[basshz]

I'm assuming your modeled 6th order is a parallel bp6 which is why you are considering using passive radiators.

It would be easier to model a series-tuned bp6 for all four of your 8's in a standard configuration (non-iso). Since you are intent on using iso and thinking about passive radiators I am also assuming you are trying to cut the size of the enclosure down.

What is your intended goal through all of this? The last time I built anything with a passive radiator was a good 4 years ago and that was more to show proof of concept than anything.

 

[Jroo 10+ year member]

Goal was use super cheap but half decent subs and cut the box size down. When I had them modeled, they modeled better in 6th order compared to everything else. I wanted to play with the PRs instead of dealing with the port length and also to learn how to use PRs.

 

[CSCStang]

Goal was use super cheap but half decent subs and cut the box size down. When I had them modeled, they modeled better in 6th order compared to everything else. I wanted to play with the PRs instead of dealing with the port length and also to learn how to use PRs.

Tough call on the ratio there as its not common running the prs in this manner. To be safe I'd go with 2 12" instead of 10" in that configuration. Very interested in this build.

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[basshz]

Goal was use super cheap but half decent subs and cut the box size down. When I had them modeled, they modeled better in 6th order compared to everything else. I wanted to play with the PRs instead of dealing with the port length and also to learn how to use PRs.

It's going to be tough (not impossible, just really hard) to cut your box size and still trying to gain output. Hoffmans Iron Law...there's no way around it. When I built my proof of concept PR system it was a quick throw together kind of box. There may be software out there that can model PR systems but I found it was easier and quicker to just do it on the fly. That's the beauty of PR's, they are tuned by mass. If your cheap subs modeled best in a bp6 you might want to look at a transmission line with less drivers (down to two versus four). A mass loaded transmission line might also be of interest to you. Overall you will have to sacrifice one to gain two (efficiency, extension, small enclosure).

Tough call on the ratio there as its not common running the prs in this manner. To be safe I'd go with 2 12" instead of 10" in that configuration. Very interested in this build.
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Two 12 inch PR's to four 8 inch subs is do-able especially in an iso loaded parallel bp6. My series tuned bp6 has been performing very well with a bandwidth of about 28hz to 80hz. Admittedly it is massive (43 inches wide, 6ft long, 16 inches high). I am remodeling soon to shrink it down some (less drivers = less required space) but overall it will still be a big box (down to 4.5ft versus 6ft). Even at 4.5ft, it will still be about the same dimensions as my old transmission line for six 8 inch subs except I'm gaining more cone area using 12 inch subs. And these are cheap subs to boot.

 

[CSCStang]

It's going to be tough (not impossible, just really hard) to cut your box size and still trying to gain output. Hoffmans Iron Law...there's no way around it. When I built my proof of concept PR system it was a quick throw together kind of box. There may be software out there that can model PR systems but I found it was easier and quicker to just do it on the fly. That's the beauty of PR's, they are tuned by mass. If your cheap subs modeled best in a bp6 you might want to look at a transmission line with less drivers (down to two versus four). A mass loaded transmission line might also be of interest to you. Overall you will have to sacrifice one to gain two (efficiency, extension, small enclosure).


Two 12 inch PR's to four 8 inch subs is do-able especially in an iso loaded parallel bp6. My series tuned bp6 has been performing very well with a bandwidth of about 28hz to 80hz. Admittedly it is massive (43 inches wide, 6ft long, 16 inches high). I am remodeling soon to shrink it down some (less drivers = less required space) but overall it will still be a big box (down to 4.5ft versus 6ft). Even at 4.5ft, it will still be about the same dimensions as my old transmission line for six 8 inch subs except I'm gaining more cone area using 12 inch subs. And these are cheap subs to boot.

I hear ya. Loves my tlines man. My 1544's play from 19-80hz no sweat with very minimal loss of dB on the top end (box us tuned ~30hz). Can demo them low lowws that all the cats want to hear and throw on some As I Lay Dying (my tunes) and enjoy my drive. Box is only 62x23.75x24.5...lol.

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[basshz]

I hear ya. Loves my tlines man. My 1544's play from 19-80hz no sweat with very minimal loss of dB on the top end (box us tuned ~30hz). Can demo them low lowws that all the cats want to hear and throw on some As I Lay Dying (my tunes) and enjoy my drive. Box is only 62x23.75x24.5...lol.
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I really do love how t-lines sound...even more over my bp6. My t-line for my six 8's was insane for what it was. For the 12's I'm using now, just like the OP, they model better in bp6 than a t-line. Though I do have two t-line models (massive enclosure size) that are just waiting to be built whenever I get around to buying about 20 sheets of birch lol.