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FSP-18-SXY Horn
FSP-18-SXY Horn
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Old 6th February 2019, 02:32 AM   #11
weltersys is offline weltersys  United States
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Originally Posted by Vintage Audio Projec View Post
Can you explain a little?
If I look at the hornresp response it does go to almost 30Hz and you can see in the impedance plot a peak at 30Hz. a second peak at 57.25Hz and then one at 91.78Hz

So if I look at it wrong please tell me, I like to learn
As Neo Dan points out, the excursion minima (Fc, Fb, tuning) is at 40 Hz.
At 30 Hz excursion is around double the Xmax of the PD 1850, so would require a steep HP filter just below Fc to keep it from gross distortion (or folding the cone like a cheap umbrella in a hurricane). The output potential at 30 Hz is therefore about 6 dB less than what your sim indicates.

I looked at it wrong too, this big horn doesn't go lower than the LAB horn ;^)
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Old 6th February 2019, 03:53 AM   #12
Brian Steele is offline Brian Steele  Grenada
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That peak in the excursion graph just below Fb suggests to me that perhaps the volume of the sealed chamber isn't the best fit for that driver, maybe it's too small. OTOH, FLHs aren't my thing, so...
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Old 6th February 2019, 05:23 PM   #13
Vintage Audio Projec is offline Vintage Audio Projec
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Ok thanks for the info guys.
The RCF LF18x451 has almost the same response.

But looking closer it is indeed more or less tuned at 40Hz (closer to 38Hz is the impedance minimum to be exact)
By making the chamber bigger the response on the lowside is better but excursion goes up.
Making the chamber smaller the response gets more peaky/ excursion goes down
Low side goes down as well.
With a smaller chamber you can also see more accurate what the tuning is.
Lower tuning means longer horn I guess?

Another option I considered whas the Tuba60 but it is a little bit weird in dimensions...and I'm not that convinced over the specs they say at the website of billfitzmaurice..... looks a little to good to be true.

I also looked at the labhorn but the dip at 40Hz doesn't look nice.

Another option was the 12PI horn but reading some stuff on the net there are people loving this design and people bashing the design.....

It doesn't need to use an 18". I actually like the 12" horns.
Maybe a scaled up punisher?
A lot to think about.
It's gonna be a summer project so I still have time to think about it. Any ideas or suggestions are ofcourse welcome.
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Old 12th October 2019, 10:53 PM   #14
Vintage Audio Projec is offline Vintage Audio Projec
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OK So I was thinking about this design again.
Recently I have 2 Beyma 15lx60v2's leftover from another project.
So as I had very good experiences with the 12lx60v2 loaded into punishers I was thinking of scaling up the punisher design and fit in the 15lx60v2

The Folding of the punisher gets a lot of horn in a cabinet.
Scaling it up with a ratio of 1.4 seems to sim good.
Using a 15" the compression ratio is 2.58:1, so a little lower wich is better for 15". The 15lx60v2 is not the biggest horn driver but it's a speaker wich is usable with a lot of designs. So backing of the compression a little is a good thing.
The box will be 114,1cm X 98cm X 70cm
Still a big box but not so big as the design from the start of this tread.
Tuning is around 38Hz
Response will go untill 30Hz but displacement will go up, on the other side the response doesn't differ much from the design at the beginning of this thread but the box is a little bit smaller.
I also think it would be usable in singles.
The punisher loaded with the 12lx60 doesn't do really well in singles. with two together it's ok.

I'll see if I can get some print screens this week.
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