20-30hz tapped horn for studio with ande drivers

[tb46]

Hi reminence,

You may want to read back through Pages 10/11 of this thread as to the stuffing, etc.. Basically, what you have there looks OK, maybe a little much fiberfill (there's got to be a store in your part of the world with a scale?); try stapling a little directly to the S1 side, and staple a bit of cheesecloth (or burlap) around/behind the woofers to keep the fiberfill from working its way into the drivers, it get pretty tight there. The density should be highest in the general area behind the woofers, and become less going away from there (but even density will work too).

Looks like you filled all the corners with glue, that should keep them sealed. As to the bracing, this is a relatively narrow box, so I think you'll be just fine; it is amazing though how much flex can be introduced into these heavy panels with the pressure from the drivers.

Regards,

[bjorno]

Hi reminence,

Agree with tb46..The amount of damping material should cover about half the length of the internal airways when using correct density and weight of the damping material.. I never do this in a hurry: IME, No time whatsoever is saved, if you later try to rectify a suspected bad applied stuffing.

I try to piecewise tear the wool nearly apart (~3" x 3" x 3" chunks) until the material looks having about equal volume density and the wool strands oriented as similar as possible .. then slightly compress all when placed back at the dedicated place..
When this is done correctly the CSA:s should be completely and evenly filled with tapered density but leaving a minimum of air pockets.

b

[reminence]

Ah, its glued now. but i should have enough room to redo it to about 1/3 (as oposed to the advised 1/2) of the throat through the driver holes if need be.

The pillow was old and rather compressed so it
took a long time to get it that fluffed up haha. I will test it tomorrow and if needed I will redo it properly with new stuffing as I think that may be an issue. Thanks for your advice.

Although I do wonder just how much of an effect stuffing vs none would be. If its huge, would the diference be in distortion, response or some other diference? I have used horn response to play with this design and cant see how changing the frequency response would make it much better since its so flat allready. Maybe more extension but that seams to me about all that could be improved. Also I wonder how this stuffing diference compares with a tapped horn the same way.

[bjorno]

Originally Posted by reminence

.. Also I wonder how this stuffing diference compares with a tapped horn the same way.

This can be modeled in MJK:s programs but what scheme did you use , the one labeled ACAD #1 or #2?

b

PS: Don't mix up you sub with a tapped one as being very different., IMO that is like comparing a Hi-Fi sub with a sub targeting PA use.

[tb46]

Hi bjorno,

I think reminence used the one from Post #38, ACAD #1, I don't know if any dimensions were modified.

Regards,