Passive Radiator Help

[Dangrebel]

I talked to David @psi about the passive radiator. Email and he should recommend what works best with the 8.

[mrazandrewm]

What email address? [email protected]?

[Aj11]

i need to hear one of these in action! I'm sure they work great and sound amazing. but in my brain it doesn't make sense!

i get it, i really do. just one of those need to see to believe kinda things

[mrazandrewm]

I've only heard/seen a few PR setups but they were for HT applications though :/ Even though they were HT setups, those enclosures sounded beautiful to my ears.

[TaylorFade]

I just built another PR setup today.

[Aj11]

I just built another PR setup today.

well lets see it!

now that i think of it i have heard one in a home. but that's Apple to zebras!

i think my only chance of hearing one where i am is if i build one.

if they do have the flat bandwidth like everyone says it very may well be what i build in my girls car.

[TaylorFade]

It's ugly as sin since it's just a prof of concept build.

I also only used 1x displacement just to see (I'm going to double it). And it's also tuned to 56hz since I couldn't get enough weight on the PR. Lol.

But with all of that said... it sounds great. You'd never know it was tuned that high if I stay under 1,000w or so. It unloads like a bitch with more than that, but if it's not unloading, it'll play anything on any Decaf zip. Which is odd since if it was a port tuned to 56hz, Decaf would get ugly in a hurry.

[TaylorFade]

While I'm waiting for the ghetto shit I did today to upload, here are some other iterations using the same PR's.

Single 10" with dual 12" PR's. This was way too much. I could never get it tuned low enough.

Same two PR's in a 1x displacement app. This one actually did pretty well on lower power. Stupid small box too. 2cf for (2) 12's.

Same box but the back of it. I left them inverted like that so I could add weight as needed.

Same sub as above, but only a single. 1cf with both 12" PR's. This actually started out life as an isobaric alignment (which is why it's so small).

[TaylorFade]

Aaaand the latest addition to my collection of ghetto boxes.

1.5cf with a single DSS Ethos

You can see the proposed location for the 2nd PR here.

And the weight I'm going to need to add to tune the thing into the 30's. Lol

[mrazandrewm]

Awesome posts TaylorFade. Might I pick your brain some more? Alright...what PR brand are you using? How do you calculate the displacement of the subwoofer and know what size PR to order? Thanks.