Faital Pro LTH102 horn observations and concerns

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#43
Yeah deeper horn has narrower pattern compared to shallower one assuming both have same mouth size. Often these deep devices are also beaming making more HF on-axis in comparison to horn/waveguide that is not beaming, having wider response. On-axis response can be compensated with EQ, not biggie. Beaming makes smaller sweetspot.
 
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#47
profiguy said:
First off, I realized making a mistake, referring to the STH100 as an LTH100... looking at the description itself, I'm pretty sure LTH means "long throw horn" and STH means " short throw horn".

That being said, I can't find the bookmarked sites anymore which had all the WG comparisons with various CDs tested together that I was referencing to. The HF on the STH100 collapses faster than some of the deeper WGs, which is its main deficit and thats really only an issue when used with larger mid drivers and lower xover points .

For nearfield applications the STH100 is a really good horn but it requires a specific CD exit angle to avoid excess response peaks and dips. Many shallow horns suffer from early HF drop-off, such as the really shallow spherical WGs used with dome tweeters. In the vertical plane the STH100 is at a disadvantage to the LTH102 which is why I chose the LTH102.

The STH100 response ripple shows up with some CDs. It was very pronounced with some of the cheaper CDs. The DE250 looks nice on the STH100 both in vertical and horizontal planes.
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I am beginning to think that you that you have more than a few things to sort out.

The PT95 horn part number is a JBL part number see, https://jblpro.com/en/site_elements/tech-note-progressive-transitiontm-pt-waveguides for an insight.

The STH100 HF111 combination is smoother, without peaks and valleys, than most. See the attached on axis plot from my bench. This is raw Audio Precession / GRAS data with no smoothing. With 2K crossover.

Thanks DT
1650583564676.png
 
#48
What's the input test voltage level on that graph? Do they publish an exit angle on that driver? Is that including any baffle? Must have a deeper exit chamber than many drivers.

Yes, there's alot of things I have to sort through with this project while doing a few other ones at the same time. Plus my test PC is down again thanks to a bad battery, so no measurements until that is up and running again.

The STH100 apparently does have some preferred WGs that really shine on it. The DE250 should be ok on it, but there's a few drivers that don't work well on it. Its just hard to trust any outside data if you don't have the WG on hand to measure yourself.
 
#51
profiguy said:
Yes, with increasing frequency, less output on axis and slightly off axis. I guess you could say the amount of throw distance at higher frequencies is typically less on a shallow WG with less beaming. That of course isn't as relevant in a domestic application when listening only several feet away.
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Evidently, this is a key element of horn physics. A long, narrow, trumpet-shaped horn - such as used on trains and boats, radiates a concentrated wavefront to greater distances > higher sound intensity, thus higher acoustic- or sound power. Compression ratio, length and shape of the exit section also matter, a lot sometimes.
 
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#59
The XT1086s arrived today and I have to admit they're in a class of their own with fit and finish. They even come with hardware. I wish Faital stuff was made this well. So far 18sound has shown to have the best made Italian drivers I've seen. Their NSD1095N also looks like its the better driver when compared to even B&C. Can't wait to hear what it sounds and measures like.
 
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#60
Any updates on those measurements.

Just to confirm what was read, some CD fits better some horns and in particular because of exit angle of the CD...

Just quoting a mail I got from faital :
thank you for your interest in visiting our website. My name is Valentina Rossi, and I am part of the Sales and Marketing team of FaitalPRO.



For home use, I would suggest you the HF108R, combined with the STH100 horn. It’s suitable for close-by listening cabinets, in small/medium rooms. Therefore an indoor/hi-fi listening is the correct use.

I had very good results with STH100 and cheap 50€ BMS CD, but with a hf108r, I think it is great!

Anyway I d like to try the 18s because I love the shape !

Any updates?
 
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