Troubles finding PR

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Peerless 830880 is. 5 1/2 inch version of the 3.5 you listed. Says in stock on Madisounds website.

Dayton do readily available passive radiators in 8" (SD215-PR) but aesthetically it is different.

Found a a Chinese 8" you may find interesting on aliexpress link below. That price is for a pair. Edit: similar can be found on eBay if you don't like AliExpress. Just type passive radiator 8 into the search bar.

Online Shop GHXAMP 8 inch Subwoofer Rubber Passive Radiator Speaker Auxiliary Bass Radiator Woofer Vibration Diaphragm Honeycomb DIY 1Pair | Aliexpress Mobile

Earthquake make the 'slaps-8'

Found those just by googling passive radiator 8
 
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Oh, this is cool! Dayton just launched a series of PRs for their ND line. It looks like a pair of ND140-PR 5 1/4" would do nicely with my TangBang at 9mm of excursion. Looks like I'll need to figure out how to model PR's as I haven't done this before. I'll stick one PR on each side of the box. I'm guessing I'll need to add some mass to lower the FS as I'm shooting for an F3 as low as possible. Going ported, I could sim an F3 at 32Hz, so I'm guessing maybe 35Hz with a PR. Still not bad for a bookshelf.

Edit:
After plugging the values to WinISD, adding both disk weights provided in the box, it looks like I can get a super flat curve down to an F3 at 35Hz - potentially a bit lower if I oversize the box, but that starts creating a scooped curve. This just might do the trick!
 
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Did you ever build this? Results?

I did. It sucked. I ran 2 of those dayton ND 5.25" PR's (one on the left side and one on the right respectively) with my TB. It could've just been tuned too low or in a bad room, but the low end was very weak compared to when I had the TB's in a ported box. It also bottomed out the PR's fairly easily even though they each have the same xmax as the TB woofer.

It looks like Dayton is pumping out new PR's and just released a Designer series 6.5" aluminum PR. It's got slightly less xmax, but is much bigger, so perhaps I should revisit the design with some of those... Now that you've brought this thread up again, I may have to revisit this one and do some modeling this weekend. :cool:
 
I built/designed just as this thread intended initially with a pair of 830880 with the W5-1138. The design is called the 'Triumph', and I built it back in 2007. Being the sporadic supply of the 830880, I designed an alternate with a single SD215PR called 'Biumph'.

Using 0.5" MDF, this is a 9" cube, and has an F3 of 40 Hz.... and it does not suck. :)

Later,
Wolf
 
I looked at the sd215pr and didn't really care for the "cheap" honeycomb look of the PR at the time (personal preference). What orientation is your PR in if I might ask? I'm one of those guys that always likes having things pointing forward if I can, but I've thought about sticking it on the bottom or back if it's up against a wall.
 
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So, I got to calculating things and WinISD sees 2x DSA175pr's bottoming out at 50 watts on the TB W5. According to driver specs, a single 175pr has a larger VD than the W5, so 2x PR's "should" handle all the excursion the W5 can dish out, right? I'm not entirely convinced those little W5's are limited to 40 watts.

Does your single 215pr bottom out with the w5? A pair of 175pr's has a higher total VD than a single 215, so if you're not bottoming out that one, me thinks I should be fine with 2x 175's...? Still a bit new to the PR game. Also, if you have a link to your build that I could reference, that would be awesome!
 
Did you tune the PRs down? If you don't lower the tuning, they will flappa-flappa like crazy. And really- 40W is the rating of the 1138 for a reason. That's thermal Pe.

Just click my sig, scroll down to Triumph, and that's all there is to it.

How are you seeing these as bottoming out? The Excursion plot? Of course they will below a certain frequency, as that is how vented/PR boxes unload. The goal is to balance that the best possible, and see if the mechanical suspensions damping is enough to keep it happy below tuning. You won't get any F3 in a non-sealed alignment without having a point where the driver unloads below tuning.

Later,
Wolf
 
It may be such a thing that the 175 and ND versions are not as durable or up to the task as far as suspensions go.

Are you modeling for maximum power input? That could also be the issue. I tend to model for output level required, not thermal power rating. For subs, you'd like to be able to hit 105dB, but not all can do that. I tend to model at 100dB/1m as a worse-case scenario for pretty much all woofer modeling. 95dB is at a point that in larger rooms issues could become a concern the further you are from the speaker. 100dB will be almost 4x the power input over the 95dB level, so it's a good measure.

Later,
Wolf
 
Perhaps. I did actually measure the travel of the ND and, to my surprise, it was the full amount specified. I know the W5 is a beasty of a little 5.25", but it's starting to get a little silly. I may just order 4x of the 175's just for giggles and see if that works any better.

Currently, I model using the rms rating, so that would be 40w for the W5. I don't really expect 100+ dB out of these things, but I do want the PR's to be able to handle as much as the driver can dish out.
 
glad i read this post, i was going to mount a PR on the bottom to hide it like they do most small subs. But understand if pointing up or down the weight will always be active and not work at all.

Wolf, if i understand correctly if you are doing the exercise and size a singular, you would halve the weight if using dual PR's? These things have confused me as some don't supply a XMax so working out the VD is quite difficult
 
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