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Passive radiator speakers… really a benefit?? To bassreflex speaker design
- Thread starter KehaDNb
- Start date
With PRs You can get away with very low tuning frequency, especially with limited box volume. With traditional BR that would mean a cery long port taking up a lot of space, with strong parisitic resonances of its own (other the tuning frequency).
- Thread Starter
- #3
What do u mean by that??
Which part of his explanation was not clear for you?
PR = passive radiator. BR = bass reflex.
- Thread Starter
- #6
Yes but which one is better?
Passive radiatior as long as you don't excceed its excursion limits
As stated, depends on the requirements og the design. If You want it small and go low, go for PR. Or if BR lenght is not a problem, then BR is fine.
I would say BR as air doesnt sag over time and in general behaves in a more linear manner. Alas, its not suitable for every design and it has it drawbacks, like parasitic resonances, that require mitigation. Also, BR is cheaper
Doesn't that mean that woofers sag over time as well?
There’s no better or worse. They both resonate the air and add low frequency sound output. What’s your aim, what do you want to achieve, what’s your specs, etc.?
Yes they do but the scale of it depends of cone weight. Woofers usually have way lighter cones compared to PR which cas easly carry 300-500 grams of weight.
I think you are an order of magnitude off. Can you show a PR that has such high moving mass? Here is an 11" model:
Passive Radiator - P280 :: Thiel & Partner - accuton
The P280 is an 11 inch passive radiator with sandwich dome. A simple but robust screw mount provides fixing of stainless steel discs in the desired quantity. The values of Vas and Cms allow for extensive tuning and various box sizes.
interesting because the denser material should in theory sag less no?
Scan Speak 26W00 PR coupled with Peerless XLS12 would require 400 grams to hit 20hz in a ~20litres box if I remember well.I think you are an order of magnitude off. Can you show a PR that has such high moving mass? Here is an 11" model:
Passive Radiator - P280 :: Thiel & Partner - accuton
The P280 is an 11 inch passive radiator with sandwich dome. A simple but robust screw mount provides fixing of stainless steel discs in the desired quantity. The values of Vas and Cms allow for extensive tuning and various box sizes.accuton.com
Its called cone sag but its the spider that gets stretched over time under the weight. So density has nothing to do with it.
You may be right on a specific model but that’s not the norm, not to mention tuning at 20Hz is the norm. Using extremes is never a good way to compare technologies.
it is ? that would require insanely large boxes.
Haflermichi
Active Member
Not noted yet but no port "chuffing" with a PR.
yeah but you need roughly two to three times the surface area of the woofer and appropriate excursion to get this.
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