Impedance very low HF region on a 3 way project

[fjadouce100]

Hi to all
I have just finished a 3 way tarkus style but with woofer Peerless P830667 , Mid Peerless P830875 and Tweeter Scanspeak D2608 91300.
Before passing on to listening test, I checked the impedance and found that the impedance is very low at the high end. Have double-checked all components, wires and connections and also swapped a new tweeter but still the impedance is the same. Enclosed are the measured impedance using Limp, the simmed impedance, the FR response and and simmed xover using XSIM. This is driving me crazy. Can anyone explain where is the fault?

 

[AllenB]

Disconnect the tweeter capacitor and measure again, compare to the sim with the cap open. This will isolate the issue to being with the tweeter circuit (or not).

 

[stv]

... seems like C1 (tweeter cap) may be shorted? or L1 (tweeter coil) is connected before C1 instead of after it.
edit: or C2 is connected directly to ground?

 

[stv]

seems like C1 (tweeter cap) may be shorted? or L1 (tweeter coil) is connected before C1 instead of after it.

sorry - this was not correct, of course.
it should be: seems like C1 is connected to ground or L1 or the tweeter is shorted.

 

[profiguy]

Sounds like a shorted cap parallel to mid

 

[fjadouce100]

Have removes tweeter cap , same curve at HF noted
Presently working on xover. Will remove mid unit and cap and give news shortly

 

[fjadouce100]

I have found the culprit. I did not think of opening the separate bass enclosure before.
In fact when I simmed the bass part of the xover and had an impedance sweep with only woofer connected I found that the HF portion of impedance remained identical as before. Upon examining I found that cap C4 was soldered before the inductor L3 causing short to ground. tks to you all for pointing me about a shorted cap to gnd. Here is the updated and correct impedance sweep. Now on to listening tests!