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Old 22nd February 2013, 05:33 PM   #801
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Welcome to the forum.

Quote:
Originally Posted by cc570 View Post
I assume corner loading affects only (or primarily) the output of the horn
Correct.

Quote:
I ask this because I am hoping to maximize the sensitivity up to 500 - 1000hz. And then again above 8kz or so.
Efficiency across the majority of the BW is inherent to the drive unit. The enclosure only impacts the LF response. To increase midband efficiency, you'd need a front horn.

Quote:
What should I expect if I loaded the front of the driver with a L'Cleach flare?
Depends on the dimensions of said horn, but a major imbalance in sound pressure levels between the low frequency region and the midband is the most likely result.

Quote:
Lastly, I saw that the Tang Bang bamboo cones W4 1320s worked in a FH Mk3. The W4-1337 have similar specs would these work
Should do.

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...and give the extra SPL above 8kz that I think I want?
Difficult to say from the published data, since the HF region is so heavily compressed that it doesn't give a clear idea about how it's behaving. Possibly.
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Old 22nd February 2013, 07:50 PM   #802
cc570 is offline cc570  United States
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Thanks for quick response.



Quote:
Originally Posted by Scottmoose View Post

Depends on the dimensions of said horn, but a major imbalance in sound pressure levels between the low frequency region and the midband is the most likely result.
Hmmm. So If I could make the horn easily removeable, I could use it or not as desired.
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Old 22nd February 2013, 08:16 PM   #803
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Another option to enhance below 500-1000Hz and above 8kHz would be to attenuate frequencies above 500-1000Hz and below 8kHz, via EQ.

Software EQ in digital player, MiniDSP, analog EQ, whatever...

Sorry for overstating the obvious.

Last edited by cogitech; 22nd February 2013 at 08:18 PM.
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Old 22nd February 2013, 08:22 PM   #804
cc570 is offline cc570  United States
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Quote:
Originally Posted by cogitech View Post
Another option to enhance below 500-1000Hz and above 8kHz would be to attenuate frequencies above 500-1000Hz and below 8kHz, via EQ.

Software EQ in digital player, MiniDSP, analog EQ, whatever...

Sorry for overstating the obvious.
True but not as much fun to execute.
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Old 22nd February 2013, 08:35 PM   #805
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I can't argue with that!

I could also suggest the unspeakable; build a multi-way speaker!

(not that I would do it myself)

Last edited by cogitech; 22nd February 2013 at 08:37 PM.
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Old 16th March 2013, 10:29 AM   #806
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Good news.

My A7.3's just arrived from Darcher Audio. Dan had been hunting for grey sets for weeks and finally found a few pairs. So I now have all the parts to go ahead with the FH3's.

The only issue is the ply I bought is 19.5 mm thick (measured all the way around).
I have heard mention of needing to change dimensions in one of the build threads but cant find the post(s).

I will have to change some cuts but should I be recalculating all the cuts to maintain exact internal dimensions/volume?

Has anybody already drawn up plans or have the sketchup file so I can adjust it properly? (Winking at you Dave)

Cheers
Dean
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Old 16th March 2013, 05:45 PM   #807
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Yes, you will need to adjust to as best maintain internal dimensions as possible, i do have drawings.

dave
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Old 20th April 2013, 03:54 PM   #808
awdelft is offline awdelft  Netherlands
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Default Why is the fh3 tilted?

Greetings 'single lovers'!
This might be a asked befor but I can't seem to find it.
What is the reason for the 4.8 degree tilt of the tqwt part of the fh3? Would there be any reason not to go ahead and build a straight version (for a pair of CHR70)?
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Old 20th April 2013, 07:23 PM   #809
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by awdelft View Post
Greetings 'single lovers'!
This might be a asked befor but I can't seem to find it.
What is the reason for the 4.8 degree tilt of the tqwt part of the fh3? Would there be any reason not to go ahead and build a straight version (for a pair of CHR70)?
aesthetics, mostly, but considering the driver mounting height is approx 32" ( 809mm) it also helps with vertical dispersion

Scott could answer more technically, but I think the answer to the second question is: "yes, there are reasons not to change the geometry & CSA of the second section of the folded path"
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Old 20th April 2013, 07:28 PM   #810
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FH3 is derived from a hypex horn. If you make the front straight, you change the cross section and horn expansion profile; this will in turn alter the gain & functional BW of the box. The dimensions / shape of FH3 generally pull several duties; the sloping front provides the expansion while also angling the driver up slightly, since for some people the mounting height would otherwise be a little low.

Last edited by Scottmoose; 20th April 2013 at 07:33 PM.
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