FaitalPro 2 way STH100 or LTH102 With 15PR400/HF100? - diyAudio
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Old 14th February 2014, 03:14 PM   #1
jamesdb is offline jamesdb  United States
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Default FaitalPro 2 way STH100 or LTH102 With 15PR400/HF100?

Looking at a 2 way Faital Pro, using the 15PR400 woofer and HF100 compression driver, what would be a better choice for a matching horn between the STH100 & LTH102? Assume using the recommended crossover point of 2KHz for the HF100. The Faital Pro literature says the HF100 and its entire CD series were designed for use with the STH100 but if paired with a 15" woofer like the 15PR400 would the LTH102 be a better match? Am looking for a 99dB system to match with a 2 watt tube amp.
FaitalPRO | LF Loudspeakers | 15PR400
FaitalPRO | HF Drivers | HF100
FaitalPRO | HF Horns | STH100
FaitalPRO | HF Horns | LTH102
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Old 14th February 2014, 10:23 PM   #2
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""Looking at a 2 way Faital Pro, using the 15PR400 woofer and HF100 compression driver, what would be a better choice for a matching horn between the STH100 & LTH102? .""

If you are already commited to the 15PR400 and HF100, then the narrow 60x40 polar response of the LTH102 would be a "better" match. Some testing of a lower Xover frequency than 2Khz is worthwhile.

The attached figures illustrate the 10-12db SPL drop in 15PR400 polar response at +/- 45 degrees for a 2Khz Xover point like the HF100 would require. The narrow 60x40 LTH102 would blend better than a wider dispersion horn like the STH100 80x70. BUT both of these horns are "physiclly small" for a 15" woofer mating.
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Better compression driver? Larger horn to control polar pattern over wide freq?
The HF10AK 1 compression driver SPL is down ~10db from 2Khz to 1Khz. HF10AK is usable down to 900Hz in SEOS-15 or SEOS-18 90x40 waveguides.

A GOOD QUESTION: Stay with 1 CD like HF10AK to reach 18KHz+, or use 1.4 CD for AUTHORITY over 700-16KHz?

A GOOD QUESTION: Can you accept a larger waveguide for better pattern control match to the 15" woofer?

A GOOD QUESTION: 1 seat man-cave(narrow horn) vs. family living room(wide horn)?
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File Type: jpg Faital2way.jpg (107.3 KB, 144 views)
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Old 16th February 2014, 02:23 AM   #3
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Attached plot of Faital 15PR400 ported box showing ~96.5/watt with a -3db at ~53Hz in a 3.2f3 box. A back loaded horn is the typical option for extending bass. GM designed a large transmission line for the 15PR400 that reaches ~40Hz .

The Metronome

An Onken cabinet will remove some even harmonic distortion with a 45Hz -3db in a 5.8f3 box.

Attached table comparing the calculated T/S parameters of several 15" woofers.

2-watts if Big Horn Territory.
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File Type: jpg Faital 15PR400.JPG (276.2 KB, 119 views)
File Type: jpg 15_inch_table.JPG (308.1 KB, 119 views)
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Old 16th February 2014, 04:23 PM   #4
jamesdb is offline jamesdb  United States
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LineSource, thanks for the replies and info they are helping me on my research & learning curve.
It does look like the HF10AK and SEOS15 would be a much better match for the 15PR400 espeacially if I can use the HF10AK crossed over at 900Hz to better match the 15PR400. But I am willing to up the budget a bit for a better fit. Considering Its more for my individual audio use rather than the family room so the controlled directivity should work well, probably using a BR or Onken cabinet. Thanks again!
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Old 16th February 2014, 07:46 PM   #5
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Room Gain:
You can measure your room dimensions and download the free Baffle Edge Diffraction Simulator 1.2 by Jeff Bagby to model the room gain for a few different speaker placements. It is common for room gain to boost bass starting ~100Hz when the speaker is placed near the rear wall and/or side wall. The Faital 15PR400 in an 8f3 cabinet tuned to 32Hz produces a -3db bass-shelf SPL starting to slope down around 150Hz.(attached). The center of the waveguide should be at 39"-42" ear level, so the box will naturally be big.

Baffle Edge Diffraction:
Jeff's simulator also models edge diffraction and shows the big-big value of round-overs or beveled edges.

diysoundgroup.com
If you purchase an SEOS-15 or SEOS-18 waveguide from diysoundgroup you should also consider purchasing their DNA-360 1" compression driver for $80. 1) it is a close copy of the B&C DE250 and considered a good value; 2) There are several well designed crossovers ~950-1050Hz for the DNA 360 in their forum that would be a good starting circuits. You can save big $$$ by purchasing only the necessary passive crossover components. You might get Xover support on their forum for the Faital 15PR400.
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File Type: jpg add room gain.JPG (243.0 KB, 93 views)
File Type: jpg 1050Hz seos15.JPG (62.8 KB, 93 views)
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