Crossover design - average impedance or?

[deanrantala]

Quick question....

Designing a 2 way speaker and this is one of my first "passive" designs (I have always done active setups).

I have measured my tweeter using DATS - which reports Re = 2.56, Fs = 654.7

I am planning to cross this at Fs * 2 (about 1200hz).

But I noticed that at exactly 1,200 hz, the impedance of this tweeter is actually around 3.3 ohm.

So here is my question: when designing a passive crossover, do we stick to the "average impedance" reported by DATS (in my case, 2.56 ohms), or is it better to do the component calculations based on the 3.3 ohm figure (which IS what the actual impedance will be at that xover point).

I plan on employing a 2nd order LR filter, if that matters.

-Dean

 

[Cal Weldon]

Actual impedance at the XO’s point.

 

[svp]

So here is my question: when designing a passive crossover, do we stick to the "average impedance" reported by DATS (in my case, 2.56 ohms), or is it better to do the component calculations based on the 3.3 ohm figure (which IS what the actual impedance will be at that xover point).

I think the best is to run full simulation of the speaker in VituixCAD and then see the impedance curves. The results may be that the lowest impedance will be at pretty broad range and crossover frequency will be not in that range.