I do have a DATS that I could just measure. Wanted to see how one estimate ballpark of mass needed or how far one can reasonable adjust the fs by adding mass.
Ok, so you can use the spreadsheet Scott is talking about or
you can measure yourself. The formula I wrote will give
you exact change of Fs for any given Mms you put in,
keeping the original Cms value of the driver the same.
you can measure yourself. The formula I wrote will give
you exact change of Fs for any given Mms you put in,
keeping the original Cms value of the driver the same.
I've heard a bunch of guidelines....20% this...50% that. In this case I was pretty comfortable adding as much as I did given the small sealed enclosure....the air compliance of the enclosure will help keep the woofer cone from over-excursion.
As long as the woofer isn't going past the physical limits I'm not sure I care.
In the case of vented enclosures.....I wouldn't add that much.
Scott
All the Q's will also change...so Fs change alone won't tell you the response in an enclosure, which is why I created the spreadsheet. Best to verify with measurements.
Scott
Strange, the document has been deleted and no copies appear anywhere on the web anymore. If you are interested in my take on an homage to the LS3/5A, check this out. The design is all there and many people have built it with excellent reviews.
https://www.diyaudio.com/community/threads/rst28f-and-dc130a-foamcore-homage-to-ls3-5a.359176/
https://www.diyaudio.com/community/threads/rst28f-and-dc130a-foamcore-homage-to-ls3-5a.359176/