Home » Sponsored » Pi Speakers » Impedance curves for Eminence Woofers?
Impedance curves for Eminence Woofers? [message #39960] Mon, 20 January 2003 07:59 Go to next message
Patrick Kopson is currently offline  Patrick Kopson
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Registered: May 2009
Chancellor
Where can I find the impedance curves for Eminence Woofers--especially the Alpha 10-A and Delta 12LF-A?

Thanks

Re: Impedance curves for Eminence Woofers? [message #39961 is a reply to message #39960] Mon, 20 January 2003 12:25 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18783
Registered: January 2001
Illuminati (33rd Degree)
Eminence offers three details that describe their impedance curves: Zmax, Re and Le. These allow you to plot a fairly accurate representation of the impedance of their woofers in free air.
Thank you [message #39962 is a reply to message #39961] Mon, 20 January 2003 12:31 Go to previous messageGo to next message
Patrick Kopson is currently offline  Patrick Kopson
Messages: 26
Registered: May 2009
Chancellor
I found the Zmax data on the spec sheets, and that is all I really needed.
What'cha gunna build, Patrick? nt [message #39966 is a reply to message #39960] Mon, 20 January 2003 16:16 Go to previous messageGo to next message
Garland is currently offline  Garland
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Grand Master
nt
Re: What'cha gunna build, Patrick? [message #39981 is a reply to message #39966] Tue, 21 January 2003 12:35 Go to previous messageGo to next message
Patrick Kopson is currently offline  Patrick Kopson
Messages: 26
Registered: May 2009
Chancellor
I completed (not finished because the cabinets are bare MDF--not even sanded yet) my 2 Pi's a few days ago. The tonal balance is off as described in the "piezo shout" thread above. To me, a complete newbie, the Delta 12-LF's high frequency roll-off looks like a better match to the 1038 than the Alpha 10-A's. Also the Alpha 10-A has a hump between 1K and 4K, whereas the Delta 12-LF has a smaller hump between 2K and 3K. So I thought I might try a cross between a Studio 2 and a Theater 3.

But I will try slightly attenuating the 1038's and damping there plastic horns first.

Re: What'cha gunna build, Patrick? [message #39983 is a reply to message #39981] Tue, 21 January 2003 15:01 Go to previous messageGo to next message
Garland is currently offline  Garland
Messages: 269
Registered: May 2009
Grand Master
What did you use for damping in the cabinet? Like my Theater 4's, the 2 Pi's I built 6 months ago have a 1/2" layer of felt carpet pad under poly 1 1/2" poly batting lining three sides of the cabinet. These 2's don't sound "broken" but they are on the bright side which is good with many of my older jazz recordings which are often pretty weak in the treble. Please report back on the effects of damping the horn. Thanks and hope to see you at some listening session soon!

G.

Re: FWIW, here's what I did.... [message #39986 is a reply to message #39981] Tue, 21 January 2003 18:22 Go to previous message
Matts is currently offline  Matts
Messages: 359
Registered: May 2009
Grand Master
Patrick-

when I built my 2Pi's, I used the full thickness of R13 fibreglass insulation on three walls and used the recommended inductor, although the inductor affects the Alpha 10. They sound good. I also damped my tweeter "horn" later, just for the heck of it cause I had some extra Xtreme Dynamat, and it helped tighten up the bass and mids, to my surprise, and didn't really affect the high notes.

Good Luck!

Matts

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