Here we go again: Alexandria XLF

[andromedaaudio]

If you look at the anechoic graph it would seem that way looking at the dip at 2,5 khz ,but here is m fremers words and wilson also mentions crossing the alexandria very low well below 2 khz

However, to avoid high-frequency beaming, this necessitates the two 7" carbon-fiber/paper-cone midrange units handing off to the tweeter at the unusually low frequency of about 1kHz. This is why one of the most significant upgrades in the XLF is its new Convergent Synergy silk-dome tweeter, made for Wilson by Scan-Speak. This replaces the inverted titanium dome used in the X-2 and is built to Wilson's specifications by Focal, variations of which have long been used throughout much of the Wilson line

 

[A.wayne]

I'm absolutely positive its not 1k .....

It's above that and the wrinkle or better the dent in the impedance mag/phase at 2.5 tells another tale backed up by the FR curve ...

I have also found silk to be the most natural sounding material for domes ....

Here, i shot the Sherrif , never shot the deputy .....

 

[microstrip]

Quoted from the Wilson Audio site:

Dave Wilson and his engineering team began a three-year process of testing and evaluating new designs coming on the market. To match the demands of its standard-setting midrange, Wilson had already redesigned its titanium tweeter with great gains made in lowering the high-frequency noise floor. This was achieved primarily through enhanced control of back-wave reflections. At the same time, work on an all-new design began, borne of the desire to follow any path that would potentially lead to technologies that enhanced the consanguinity of Dave's speakers to the live event.

Their testing quickly revealed that tweeters able to play to 50kHz frequently did so by lowering the mass of their drivers. This, in turn, imposed at least two limitations on their performance. They failed to achieve the dynamic contrast required of a Wilson loudspeaker. Second, they couldn't play low enough to cross over at the 1.2 kHz point demanded by the Wilson midrange driver. Most interestingly, none of the new exotic designs matched the dynamic contrast and harmonic expression of Wilson's existing titanium design.

 

[A.wayne]

The impedance peak is at 1.5 , so electrically 1.5 , phase angle reflects 1.2 , then there is a dip leading to the peak on the tweeter side , could be xover notch or tweeter breakup, the FR looks more like breakup ....

I stand corrected , its closer to 1.5 than 2k....

Yes closer examination , it looks closer to 1.5 , yes the region in question with 1.5 being the peak, interesting choice and reflected in the waterfall plot ...


Hmmm xover @1.2k -1.5k Interesting indeed ......