passive radiator sim (hornresp)

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rookie attempt atchecking this sectiion of HR out..... so far i have a strange looking overdamped super low tuned ....yuck. (I’m sure I’ve screwed up something (s))

it’s the 7” dayton epique driver and ‘one’ of the matching radiators at this point .
I need to add another. shoukd I add another Sd and Mmd in the PR section to perk up the low end extension section?
 
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Looks close to a sim in a 26Hz Fb smaller box (yours is ~3 times Vas) using a SLAPs M8 (at 40.4mm excursion) about the same displacement as the 2 Dayton PR.
The driver specs seem a little different, your Mmd and BL are lower, Cms higher.
Dayton 180HE-44 &Slaps M8.png

Not the cheapest way to make low end, but pretty tiny.
 
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