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Old 25th April 2012, 04:55 PM   #11
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by sreten View Post
Hi,

FWIW I can't reconcile the various curves filters info etc, though the idea
an impedance curve is "ugly" is a new one on me, it is what it is, the kink
at 1KHz is a driver issue. The peaks are inevitable with series filters.

rgds, sreten.

Dave has already implied his concerns of the possible affect of roller coaster ride of impedance amplitude (not to mention unpublished possible tilt-a whirl of phase angles) on low damping factor SE amps that a lot of us like to employ.

Out of curiosity, can you address my second question in previous post:
Quote:
how does one reconcile those with what appears to be a relatively minor change in the presumably on-axis FR above say 300Hz?
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Old 1st June 2014, 03:30 AM   #12
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@ Dave,

Is there any possibility for using "Fountek FR135EX 5" on the FH3.

Thanks,
Bibin
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Old 1st June 2014, 04:08 AM   #13
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It's the right size, worth a try.

dave
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Old 1st June 2014, 04:22 AM   #14
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Quote:
Originally Posted by planet10 View Post
It's the right size, worth a try.

dave
Thank you Dave for the quick response.

Actually I was thinking about Alpair 7, and suddenly this FR135EX came into my mind and checked the specification and has similar properties. In-fact FR135EX seems a bit better than the other.

With your permission I am planning to do an experiment on my FH3 with this FR135EX on an oval baffle. Please let me know any other parameter should tweak or modify while doing the alterations.

Thanks,
Bibin
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Old 1st June 2014, 08:36 AM   #15
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Off axis response is not likely to be pretty with that deep cone & ruddy great phase plug. Spec. is as Dave says more or less in the right region. You'll lose a little LF gain, but it should work reasonably.
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Old 2nd June 2014, 02:21 AM   #16
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Quote:
Originally Posted by Scottmoose View Post
Off axis response is not likely to be pretty with that deep cone & ruddy great phase plug. Spec. is as Dave says more or less in the right region. You'll lose a little LF gain, but it should work reasonably.
Thank you Scott. I will try it and post the feedback...

Thanks,
Bibin
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Old 2nd June 2014, 03:11 AM   #17
sreten is offline sreten  United Kingdom
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Quote:
Originally Posted by chrisb View Post

Thanks Sreten for posting the link to enclosure / filter circuit design - as I seldom pay particular attention to such documentation, this is the first time I can recall seeing a manufacturer's impedance graph posted for a full range driver including EQ . Are those substantial peaks in the impedance around 1200 and just over 10K typical results of of such networks, and how does one reconcile those with what appears to be a relatively minor change in the presumably on-axis FR above say 300Hz?
Hi,

You can reconcile them with the first peak dealing with box diffraction issues,
the second dealing with the issues around 10KHz. As ever though with the
write speed of the graphs its hard to work out what is actually going on.

Also see the NS3 stuff on this page : Zaph|Audio and Zaph|Audio

Which suggest the first peak is also about a driver issue, but
the driver impedance overall rise suggests some BSC also.

FWIW with the EQ its relatively very easy speaker to drive, ideally
suited to low power class A, (with a decent high damping factor).

rgds, sreten.
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Last edited by sreten; 2nd June 2014 at 03:18 AM.
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