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Passive Radiators
I am still sorting out my newish computer and design programs post my other one having an impassable bsod after uninstalling avg.
I have a current box with one woofer and two passive radiators, which is overkill, one radiator is capable of doing what it needs.
Without modeling, it seems logical that changing nothing but removing one radiator and sealing off that hole would require a simple mass adjustment of the other radiator to tune where I was with two.
In my feeble mind, it would be the same as removing or plugging one of two ports, which I think would require shortening the other by half? Maybe er no?
If that was the logic I suspect I would remove half the mass from the remaining radiator?
Please let me know if I’m remotely close or not even. Thanks gents.
Comments
Yes, operation is similar to ports. 2 identical radiators require double the moving mass of a single one for the same tuning. It's not as simple as cutting added mass in half to drop from 2 radiators to one, you need to reduce by added mass + cone mass, so you need to know the Mms of the radiators, or just adjust the mass willy nilly until its just right.
Yep, above seems to be the case pretty much.
I just did a quick setup in WinISD
PR (DS175-PR) with 36.6g mms:
1x PR with no weight got roughly the same slope as 2x PRs with 30g added to each (so 66.6g ea if mms is included).
Then I tried 4x PRs to make sure it wasnt a fluke. Confirmed roughly same slope with 90g added to each (126.6g ea).
Sometime I forget about this.. I get too focused on modeling but doing this and measuring impedance is probably more accurate in the end anyway.
Excellent, thanks, this is how I need stuff laid out for me sometimes for it to make sense to me lol..