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jbl 2205 vs eminence omega 15 [message #52964]

Mon, 15 December 2008 13:55

Joep Ritterbex
Messages: 8
Registered: May 2009

Esquire

I am building the pispeaker 4, but i'm having a dillema.
I can buy 2 jbl 2205's for a good price. But are jbl 2205's better sounding than the eminence omega?

thanks..

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Re: jbl 2205 vs eminence omega 15 [message #52966 is a reply to message #52964]

Mon, 15 December 2008 14:41

Wayne Parham
Messages: 18787
Registered: January 2001

Illuminati (33rd Degree)

The 2205 woofers are really nice. I used those for a long, long time. The 2226 drivers handle more power and are very clean, so they're the latest and greatest of this line of drivers. But I don't consider the 2205 as a step down just because they're obsolete. They're wonderful drivers.

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Re: jbl 2205 vs eminence omega 15 [message #52972 is a reply to message #52966]

Tue, 16 December 2008 03:58

Joep Ritterbex
Messages: 8
Registered: May 2009

Esquire

Thanks for your answer, but I wanted to know if there is a big difference between the jbl 2205, and the eminence omega 15.

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Re: jbl 2205 vs eminence omega 15 [message #52973 is a reply to message #52972]

Tue, 16 December 2008 11:34

Wayne Parham
Messages: 18787
Registered: January 2001

Illuminati (33rd Degree)

I like the Omega 15 but it is not as clean sounding as the 2205 at midrange frequencies. The 2205 has a shorting ring for reduced distortion, and you can really hear the difference, especially when used as a midwoofer. Its successors, the 2225 and 2226, have additional incremental improvements, mostly improved heat control.

The things that are most important in a high-efficiency midwoofer like this all revolve around midrange quality, so cone construction (flex damping) and motor construction (immunity to flux modulation) are what set apart the good/better/best quality points. The JBL 22xx series has long set the standard, in my opinion, for large format midwoofers.

If intended use is purely below 100Hz, there is probably little to be gained by using the more expensive JBL drivers. But if the driver will be used up to even just 300Hz, I'd prefer the JBL. That's why they're available as an upgrade option in the seven π loudspeaker, because the woofer and midrange are allowed to overlap in the lower midrange band, to mitigate floor bounce and high-frequency room modes just under the Schroeder frequency. The quality difference is even greater when the woofer is used up to the frequency where DI begins to collapse, such as the case in the directivity-matched two-way speakers like the four π loudspeaker.

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Re: jbl 2205 vs eminence omega 15 [message #52974 is a reply to message #52964]

Tue, 16 December 2008 17:14

jeff p
Messages: 16
Registered: May 2009

Chancellor

i saw this thread just now.
i was searching to see if anyone had discussed using a 90x60 horn instead of a 90x40, i saw the B&C me20 on ebay....i'm guess it would completely alter Wayne's 4pi design since it has different vertical dispersion, but wanted to search and see if it was discussed.

anyway here is the link to the B&C 15.
http://www.audioroundtable.com/PiSpeakers/messages/17110.html

would using a 99db woofer in place of the 97db woofer require any crossover changes?
also would it make the efficiency of the 4pi go up a bit or is it a immaterial difference?

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Re: jbl 2205 vs eminence omega 15 [message #52975 is a reply to message #52974]

Tue, 16 December 2008 17:50

Wayne Parham
Messages: 18787
Registered: January 2001

Illuminati (33rd Degree)

I would not want to use a horn with vertical pattern too large. For one thing, nulls appear above and below the forward axis and it is best if the nulls are set outside the horn's vertical pattern. And for another, radiation at large vertical angles really only serves to increase ceiling and floor reflections, which is an undesirable property. For this reason, all of my horn loudspeakers are designed to use a 90°x40° horn.