A great visual representation of this effect. In case anybody's wondering, a vented cabinet would produce the same effect. At Fb (tuned frequency) the vent moves most of the air (Helmholtz resonance), while the cone moves least.
...for extra credit, it would be cool to see the opposite result as well, with bean movement on one of the passive radiators maximized at that same frequency.
this is perfect for me , I learned this from you and it let me know that my box is tuned to 30.31 the fs of my sub is 31 hz. so i hit it pretty close . sounds really great on all music . Thank you .
The very few grams of those dried beans wouldn't amount to a hill of beans in the change of response. It actually takes quite a bit of weight to offset the weight of the air to change the FS of the Passive radiator.
That is interesting. I am reading Loudspeaker Design Cookbook atm. I always figured that the tuning Fr of a cabinet is when the note/Hz is the loudest and is a passive way to increase bass response as an extended SPL .... but apparently not.
Musiclear must definitely right !!! There’s generators on RUclips for weed 30hz but a lot of them get taken down ,,, there’s a frequency for everything 🤘😁
But what good does that do?Knowing your box is tuned to 30.31hz , you can't adjust a radiator, if you had a port tube you could extend it or shorten it I guess.
This is a DIY system that I made a few years ago and the passives have a weight mount in the back for tuning. The more weight, the lower the tuning frequency. So, yes, you can tune them to match how the drivers interact with the cabinet and this will have a profound effect on low-end response.
The only way that would make a difference is if the cabinet has resonances and the coating stops those. Otherwise, no. It will not affect the tuning frequency at all.
Is is safe for me to assume this trick can work for ported boxes as well, if it is fair to believe that a port works in a similar effective manner as the passive radiator?
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best ever visual demo, so literally you can "tune" box by loading weigh on radiator, if you need to lower the initial tuning frequency which is higher
Exactly... :)
A great visual representation of this effect.
In case anybody's wondering, a vented cabinet would produce the same effect. At Fb (tuned frequency) the vent moves most of the air (Helmholtz resonance), while the cone moves least.
Nordgrinder ,,,have a look at cymatics
...for extra credit, it would be cool to see the opposite result as well, with bean movement on one of the passive radiators maximized at that same frequency.
this is perfect for me , I learned this from you and it let me know that my box is tuned to 30.31 the fs of my sub is 31 hz. so i hit it pretty close . sounds really great on all music . Thank you .
thanks that was straight forward
Should probably use less beans since added weight will change resonance of driver.
The very few grams of those dried beans wouldn't amount to a hill of beans in the change of response. It actually takes quite a bit of weight to offset the weight of the air to change the FS of the Passive radiator.
That is interesting. I am reading Loudspeaker Design Cookbook atm. I always figured that the tuning Fr of a cabinet is when the note/Hz is the loudest and is a passive way to increase bass response as an extended SPL .... but apparently not.
30 hz is also the natural frequency of weed ,,also if you meditate on 30hz you feel stoned 😂😂,,,you have an awesome speaker ,,,epic video 🤘
I've not heard that, but it may be worth the adventure. :)
Musiclear must definitely right !!! There’s generators on RUclips for weed 30hz but a lot of them get taken down ,,, there’s a frequency for everything 🤘😁
Quite clever
Ok so. When the active driver almost doesnt move. But the passive radiator moves the most? If so mine is tuned to 28 hz
Exactly... :)
@@Musiclear thx for answering
But what good does that do?Knowing your box is tuned to 30.31hz , you can't adjust a radiator, if you had a port tube you could extend it or shorten it I guess.
This is a DIY system that I made a few years ago and the passives have a weight mount in the back for tuning.
The more weight, the lower the tuning frequency.
So, yes, you can tune them to match how the drivers interact with the cabinet and this will have a profound effect on low-end response.
@@Musiclear
So what tuning frequency did you settle on?
And which subwoofers and passive radiators are you using?
Inquiring minds want to know! :-P
Quick question if I were to paint the inside of a subwoofer enclosure will the tuning frequency get lowered
The only way that would make a difference is if the cabinet has resonances and the coating stops those. Otherwise, no. It will not affect the tuning frequency at all.
nice!
Is is safe for me to assume this trick can work for ported boxes as well, if it is fair to believe that a port works in a similar effective manner as the passive radiator?
Yes, That is true. It will work in any tuned box.