Isobaric Tangband 5” with passive radiators

One, two and 3 washers on the pair of Dayton epique 5.5” passive radiators. Pair of tangband w5-1138f in isobaric
 

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These impedance bumps in the 30Hz range look like the passive radiators are hardly working, something like a leaky sealed box.
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What drive voltage was used for the impedance test?

Seems awfully perky (in reality) when the radiators kick in
Perky..
Do you mean the passive radiators don't work below some drive level?
Did you try stretching them to Xlim before the tests?
 
The ‘perky’ low end sounds like this to me. The ‘room’ likely influencing my ‘brain’?

It sure sounds good when it’s doing its thing…. I just Wish this all was ‘louder’, poor little tangbands try so hard
 

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If those are both W31876S, then other parameters have likely shifted to keep the model the same. I had a W5-1138 with a 60Hz Fs once, but the model matched anyway.

I still say the small BP4 I built called Goosebump has the best performance this little booger can give. Vented it needs a highpass, but BP4 gives a solid air-spring to keep it from unloading.