KLIPSCH Jubilee measurements

[Zvu]

This one: https://www.klipsch.com/products/jubilee-floorstanding-speaker

It uses Celestion latest technology compression driver Axi2050 developed by Dr Jack Oclee-Brown (VP of Technology at Kef) that is capable to cover frequencies from about 300Hz up to 20kHz.

Principles of operation explained here:

More graphs for Klipsch Jubilee here:

KLIPSCH Jubilee

Klipsch przygotował Jubilee z okazji swojego 75-lecia. To największe i najlepsze dzieło w historii firmy, nad którym pracował już sam założyciel. ...

audio.com.pl

Gotta love those Poles, they mean business.

 

[jackocleebrown]

@Zvu , thanks for the shout out, but I should clarity that my work on the Axi2050 was a very small part of the total project. Mark Dodd at Celestion was the driving force behind it, and deserves all the credit, along with the rest of the incredible team there. My bit was on the theory of how a big compression driver diaphragm could be used over a wider bandwidth than normal.

 

[holdingpants01]

there's a funny part in the review about two sections of the speaker being out of polarity and them recommending connecting LF or HF part with flipped polarity, or choosing the preferred one by ear (with a suck out where the crossover overlaps)

 

[Chris A]

That doesn't look very representative of the results measured in-room (on-axis) in my experience. Here is a REW measurement at 1m microphone distance on-axis with the Jubilee K-402 horn while the loudspeaker is in a full room corner (i.e., nominally +12 dB bass response over half-space response):

The two dropouts in the amplitude response (82 Hz and 190 Hz) move when you move the microphone position: they are 1/4 wavelength cancellations corresponding to side wall bounce and floor bounce, respectively.

As you can see, the only real transfer function issue is the phase growth from the apparent 310 Hz 4th-order crossover filters embedded in the Klipsch-supplied DSP box with fixed DSP settings. Again, as you can see, all the phase growth is excess phase (i.e., all-pass of the crossover filters). The min-phase plot gives you an indication of what is possible if using crossover filters without the all-pass phase growth. You can certainly hear the difference when that phase growth is removed via user-adjustable DSP crossover (in the link I just posted here, it is a Xilica XP series, and the HF K-402 horn is using TAD TD-4002 compression drivers instead).

Putting these loudspeakers in full corners really does require re-EQing the bass back to flat response (about -12 dB below70 Hz), because they pick up room gain easily (horn loading). When re-EQed back down to flat amplitude response, this further reduces any intermodulation distortion of the bass bins (because of the increased efficiency of room loading).

As with most "audiophile" listening reviews, I really can't understand (reading the English translation via Google Translate) what they are actually trying to say. The parts that I do understand are not at all aligned with what I'd say. The loudspeakers actually sound much better than described. The reviewer must have had an issue with the listening room/listening position(s) or dial-in of the loudspeakers. I didn't see room-specific acoustic or even dimension information in the review, or the placement of the loudspeakers and listening positions within that room...or even a picture. With loudspeakers of the caliber of these, little things like room acoustics matter...

Chris