Hi!
So I am into home theater and building Tactile Response devices like Hovereze, HoverBack etc.
For example, here is a photo of my HoverBack setup only missing the thick vinyl to seal the tubes. Then a board is placed in front as my backrest to transfer all that tactile experience to my body.
The Hovereze is the same but is a platform on the floor so the sofa rests on top of it to get that impact. For example we get amazing wobble feeling effect on the Hovereze on frequencies like 1-4Hz or so and for the most part we use the bottom platform to over from 1hz to 20hz (some go higher like 40hz).
This is all a matter of preferences of course.
So what I would like to understand when comparing woofers is what matters most to handle those low frequencies, with the weight on top of them without going to smokeville.
Is it BL, FS, XMAX, QTs?
From my understanding I want high BL for motor strength.
Higher QTs like .500 or higher for this sort of sealed setup.
And of course higher XMAX.
The FS and frequency response I am not so sure how they relate as the ones we are using seem to hit single digits just fine for this use, even with FS and response that is not that low.
Thanks for any tips on this.
So I am into home theater and building Tactile Response devices like Hovereze, HoverBack etc.
For example, here is a photo of my HoverBack setup only missing the thick vinyl to seal the tubes. Then a board is placed in front as my backrest to transfer all that tactile experience to my body.
The Hovereze is the same but is a platform on the floor so the sofa rests on top of it to get that impact. For example we get amazing wobble feeling effect on the Hovereze on frequencies like 1-4Hz or so and for the most part we use the bottom platform to over from 1hz to 20hz (some go higher like 40hz).
This is all a matter of preferences of course.
So what I would like to understand when comparing woofers is what matters most to handle those low frequencies, with the weight on top of them without going to smokeville.
Is it BL, FS, XMAX, QTs?
From my understanding I want high BL for motor strength.
Higher QTs like .500 or higher for this sort of sealed setup.
And of course higher XMAX.
The FS and frequency response I am not so sure how they relate as the ones we are using seem to hit single digits just fine for this use, even with FS and response that is not that low.
Thanks for any tips on this.
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I'm no expert with the Hover HeZe, but since the Fc is pushed so far above the Fs in the tiny enclosed volume, really comes down to maximum motor force and power handling.
The tiny enclosed volume limits displacement, and increases impedance:
https://www.diyaudio.com/community/threads/extra-low-frequency.411728/page-2#post-7662032
Since you have already built yours, you probably have seen this:
https://gitlab.com/HeZeGuide/HeZeGuide/-/tree/main
No real insight to driver choice, but good practical examples, and makes it clear that a wide range of drivers can work.
The tiny enclosed volume limits displacement, and increases impedance:
https://www.diyaudio.com/community/threads/extra-low-frequency.411728/page-2#post-7662032
Since you have already built yours, you probably have seen this:
https://gitlab.com/HeZeGuide/HeZeGuide/-/tree/main
No real insight to driver choice, but good practical examples, and makes it clear that a wide range of drivers can work.
Sorry do you mind explaining a bit more about what this means?
So based on your reply, BL and RMS will be the things to look for from your understanding and not the FS or response. That would make sense as my current HezeBack drivers (Kicker 48CWR122) have a 31.5Hz FS yet they can reproduce and insane of 3Hz and below wobble .
Thank you!
Fs is the driver's free air resonance.
Fc is the resonance of the driver in the sealed cabinet, always higher than Fs, and goes higher the smaller the enclosure is, which is only a few liters in a Hover HeZe.
Fc is the resonance of the driver in the sealed cabinet, always higher than Fs, and goes higher the smaller the enclosure is, which is only a few liters in a Hover HeZe.
So I guess in terms of Heze use, that indeed does not matter because otherwise I would not be getting anything remotely to what I can get down to even 1hz depending on my settings from a driver with a 31hz FS.
Then I will continue looking at BL and RMS instead. I just wish companies were a bit more consistent with how specs are listed lol
Thanks!
Then I will continue looking at BL and RMS instead. I just wish companies were a bit more consistent with how specs are listed lol
Thanks!
I'm gonna say Xmax, QTS (higher = larger sealed enclosure & lower = smaller sealed enclosure), and power handling.
It takes a lot of cone area and travel to reach single digits.
Another issue I have is figuring out specs among manufacturers for example here is the one for the Kickers I use for my HezeBack
You can see the Bl listed as 15.614 and Re at 3.80 BUT then this manufacturer has T/S for both when wired as Series or Parallel
Rockville K6 D2
So I cannot tell if the Bl of the Rockville is higher than the Kicker CompR because I dont understand which numbers are comparable if any.
Any thoughts?
PS My thought was that since the Re for the Kicker is listed as 3.80 then those TS specs will be as Series thus I could compare them to the Series TS of the Rockville...but what do I know LOL
You can see the Bl listed as 15.614 and Re at 3.80 BUT then this manufacturer has T/S for both when wired as Series or Parallel
Rockville K6 D2
So I cannot tell if the Bl of the Rockville is higher than the Kicker CompR because I dont understand which numbers are comparable if any.
Any thoughts?
PS My thought was that since the Re for the Kicker is listed as 3.80 then those TS specs will be as Series thus I could compare them to the Series TS of the Rockville...but what do I know LOL
Experiment, take a fictitous driver with a 0.30 Qts and compare it to another ficticious 0.80 Qts and they both have the same T/S parameters everywhere else. Model them in the same size sealed enclosure and see which frequency response you prefer.