Omega 15 is out of stock at my local dealer (I'm not in USA)
KAPPA PRO 15 ALF2 seems to be a good replacement
Has anyone tried it?
Will it work in a 4Pi cabinet?

I've seen posts about it, but they are very old, so I'm asking again in case someone has any news

Thanks in advance!

As a result, midwoofer selection is critical. The quality of the midwoofer is extremely important, because it is what voices the speaker through the critical midrange.

Try to find a JBL 2226 if you can.

Thanks Wayne!

I didn't notice that the required drivers for 4Pi are "Omega Pro 15" while the current eminence model is "Omega Pro 15A".

Now, I'm the owner of a useless(???) pair of Omega Pro 15 A.

Will the 4Pi work with Omega Pro 15 'A'?
Should I throw them to the trash can?

Thanks!

However, I'm still a bit confused. The specs for 15A at eminence web site and the specs from the link at Pi site are different.

Parhaps the values describe similar drivers and I can't see it?
Could be the case, I just see numbers, I don't understand them.
But these numbers look very different.

For example, from eminence website:
Resonance 33Hz
Usable Frequency Range 51Hz-1.7kHz
Sensitivity*** 97.3
DC Resistance (Re) 5.28
Coil Inductance (Le) 1.04mH
Electromagnetic Q (Qes) 0.33
Mechanical Q (Qms) 5.69
Total Q (Qts) 0.32
Compliance
Equivalent Volume (Vas) 9.1 cu.ft.

From the PDF document at Pi web site:
Resonance 39hz
Usable Frequency Range 35Hz-2Khz
Impedance (Re) 4.98ohms
Coil Inductance (Le) 1.48mH
Electomagnetic Q (Qes) 0.37
Mechanical Q (Qms) 8.57
Total Q (Qts) 0.35
Compliance
Equivalent Volume (Vas) 6.92 cu. ft.

Thanks!

Eminence has done this a lot over the years. They're fast and loose with their spec sheets. But don't take this as a slight on Eminence, in fact, maybe it's more honest to republish specs every year or two. After all, materials change slightly over the years, suppliers change, different vendors are subcontracted, etc. In fact, you can even take the same driver, test with a 0.1v signal and get one set of numbers, retest immediately with 1.0v and get a different set of numbers. Run the speaker at high power for a few minutes and retest and it wil be entirely different.

The important thing is that the electro-mechanical specs, when used in a system, provide the desired response curve. They do in every case I've found of Eminence drivers that have shifted from one season to the next. They're different but not in a meaningful way. That's why I don't get too excited about changing spec sheets posted, if you sample a few yourself, you'll likely find matching numbers, or very nearly. They're compatible parts.

I measured a pair of Delta 15A pro drivers I have and this is the result using WT2:

Revc 5.7 ohm
fs 40 hz
Qes .38
Qms 3.99
Qts .35
Zmax 53 ohm
Le 1 mH
eff 97.8 db/watt (3.874 %)
Vas 8.3 cu ft

The other driver measured really close to these specs also!

I'm looking at using a 7.75 cu ft cab.

What would you recommend for tuning the port frequency???

Regards, Ron

Thanks!

If using it in a larger box like you're talking about, I'd probably shift the Helmholtz frequency down a smidge, say 35Hz to 38Hz.

All those values form kind of a continuum of alignments. Big box, from 6.0ft3 to 10.03, the port should be somewhere between 35Hz and 38Hz, larger tuned lower. Smaller box, below 5.0ft3, tune to 40Hz.