Fountek FR135EX?

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chrisb

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Joined 2002
sreten said:
Hi, http://www.madisound.com/pdf/FR135EX-Encl.pdf, rgds, sreten.
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of the scores of FR drivers that many of us haven't yet played with, these are another one

Fountek FR135EX 5" Full Range: Madisound Speaker Store


personally, after underwhelming experience with the FR88EX, at $102 ea* this is one I'm not eager to taste test on my own dime

* Fountek isn't the only brand victim to the vagaries of cost "fluctuations" on Neo, and I wouldn't hold my breath waiting for current price levels to change, or distributors such as Madisound, PE, et al to write down stale inventory

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?
 
harvylogan

harvylogan

Member
Joined 2007
Thank you both for the responses. This driver is on my list for possible use in an OB design application I have been working on. Although the specs look attractive at the onset, I felt it was a bit pricy as well as being a little troublesome in the upper end for a passive correction circuit. Sometimes these issues are worth the extra effort if the driver has a high degree of accuracy and sounds good as well. In this case maybe not.

Matthew
 
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chrisb

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Joined 2002
harvylogan said:
Thank you both for the responses. This driver is on my list for possible use in an OB design application I have been working on. Although the specs look attractive at the onset, I felt it was a bit pricy as well as being a little troublesome in the upper end for a passive correction circuit. Sometimes these issues are worth the extra effort if the driver has a high degree of accuracy and sounds good as well. In this case maybe not.

Matthew
Click to expand...


keep in mind that in only 2 replies in this thread so far, no-one has noted any experience with these - they might sound quite fine - it certainly wouldn't be the first time that published graphs didn't tell the whole story
 
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sayrum

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Joined 2011
C

chrisb

Member
Joined 2002
sreten said:
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.
Click to expand...


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:
how does one reconcile those with what appears to be a relatively minor change in the presumably on-axis FR above say 300Hz?
Click to expand...
 
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bibin3210

Member
Joined 2011
planet10 said:
It's the right size, worth a try.

dave
Click to expand...

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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sreten

R.I.P.
Joined 2003
chrisb said:
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?
Click to expand...

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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Ronj

Member
Joined 2010
Reviving an old thread... I am thinking of experimenting this driver(Fountek FR135EX) in a "non-fullrange" use. To be precise, in a LS 3/5A clone cabinet I have from an abandoned LS 3/5A clone project of mine.

Simple simulation on WinISD with published data from Madisound, seems the driver is suited for that 5.0L+ cabinet with a F3 of 90Hz. Also the driver dimensions snugly seem to fit my LS 3/5A Cabinet.

My plan is to use this driver as a mid-bass with a SEAS Prestige 27TDFC (H1189) tweeter crossed somewhere between 3K to 5K(First order butter-worth perhaps)...

Planning to get the FRD and ZMA for this driver is next step. So, wanted to ask the heavy-weights around here whether it'd be a blunder?

All I have is Dayton DATS and Jeff's "Passive Crossover Designer 7 (2007)" EXCEL with me. No esoteric tools. Not even the capability to measure the Frequency response.
 
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