[Jubilee Crossover Frequency]

This is the part # from Eminence, the makers of the speaker. Note that the K33E has a longer x-max than a JBL2226, and as a direct radiator is 101dB/2.83V/1M

By the way, according to the TS numbers that I have, the JBL G135 (not G135A) would be a good substitute for the K33E, at least in terms of the required back-volume, throat area, and fHM. I have no idea about availability.

Edgar

[Jubilee Crossover Frequency]

FS HZ 34.46

QT .390

Ah, that's better. That puts fHM at 177 Hz, as indicated by D-MAN in post 753043.

Is there a complete list of TS parameters for Klipsch woofers available anywhere?

Thanks,

Edgar

[Jubilee Crossover Frequency]

Those numbers are at least one octave lower than I would have expected.

From Keele; fHM = 2fs/Qts. It is possible that I have the wrong numbers for the TS parameters, but I found most of them in this forum.

Edgar

[Jubilee Crossover Frequency]

Couple of things: first there are 2-12" drivers in the Jubilee, so the efficiency is doubled automatically. This raises the upper frequency corner based on the decibel rating, of course.

But the tide lifts all boats. Raising the efficiency should just raise the entire response curve.

second, the Keele mass rolloff equation in question puts the K33E at 177 Hz, yet it crosses over effectively in the Khorn at approx. 400Hz. I have always found this confusing, but the K33E is not operated at full efficiency in the Khorn, either. Increasing the reactance applied to the driver (in this particular case) widens the bandwidth.

My numbers show fHM for the K-33-E to be 88 Hz, based upon fs=28 Hz and Qts=0.633.

Third, the Jubilee has folds that are optimized to pass  higher frequencies than is the Khorn.

The USABLE high frequency corner is much higher than the simple math result would indicate.

There is obviously more going on here than meets the eye.

Thanks,

Edgar

[Jubilee Crossover Frequency]

"I like to let the speaker components tell me where they would like to be crossed over."

Thank you. It's tough to argue with reality. "When reality disagrees with theory, get a new theory."

Edgar

[Jubilee Crossover Frequency]

Welcome! Nice avatar too.

Thanks. That's actually a Speakerlab K that I brought into TurboCAD. I bought the plans way back in 1979, but never got around to building it.

Edgar

[Jubilee Crossover Frequency]

Greetings!

I have been interested in building a dual-12" horn bass enclosure since the Klipsch/Delgado article in JAES several years ago. I just discovered these forums the other day, so I've spent the past couple of days catching-up on everyone's posts about building a Jubilee clone.

I have a question about the upper frequency limit of the bass cabinet. People report Jubilee crossovers of 600, 800, even 1000 Hz. But according to the Thiele/Small parameters I've been able to find for various Klipsch 12" drivers, along with Don Keele's horn parameter equations, the woofers themselves run into mass-rolloff well below that:

K-1242 384 Hz

K-22-E 189 Hz

K-22-K 170 Hz

K-23-K 195 Hz

K-24-K 149 Hz

K-25-K 221 Hz

Does Klipsch EQ the Jubilee woofers to extend the HF response?

Thanks,

Edgar