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Old 8th April 2010, 08:07 PM   #1041
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What are you doing for <100hz?
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Old 9th April 2010, 04:14 AM   #1042
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I've got two corner cabs that are 1.5" thick plywood built in the 50's loaded with 12" Martin Logan subwoofer drivers. Each cab has a BASH 300 plate amp on it. Those sit in the corners behind my main speakers. Then I have 2 KLH HT subs in the back corners just to smooth the sub signal throughout the room. Here are pix of the subs. At some point in time, I will refinish them to match my main speakers.
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Old 9th April 2010, 04:17 AM   #1043
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Here is pix of my speakers now. The JBL scoops just don't sound very clean. I think it is the front wave hitting the back wave that messes the sound up. They sound much better when I stuff the back horn with sofa cusions. They are also WAY too tall. So I will keep the Heil tweets, my mid horns, and the subs.
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Old 9th April 2010, 07:39 AM   #1044
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Quote:
Originally Posted by djn View Post
The other night, I was working in the program and somehow I clicked on one of the boxes and a seperate box came up that allowed me to pick what flare I wanted. I think there were 6 or 7 to chose from. In the past I click on the third box over (don't have the program up at the moment) and hit "T" from tractrix. Since then, I've not been able to find that new window with all the types of flares listed. Where is that???
Hi djn,

If a length input box does not already have a horn flare type assigned to it, then double-clicking on that box in Edit mode will display the option form you are referring to, before the Horn Segment Wizard tool becomes available.

Double-clicking on the L12 input box will show seven horn flare options:

* Conical
* Exponential
* Hyperbolic-exponential
* Le Cléac'h
* Oblate Spheroidal
* Spherical Wave
* Tractrix

Double-clicking on either the L23, L34, L45 or L56 (for compound horn) input box will show two horn flare options:

* Conical
* Exponential

Note that the option form is associated with the Horn Segment Wizard only, which needs to have a flare type assigned before it can operate.

If you don't want to use the wizard, but simply just change the flare type, then highlight the length input box and press the appropriate key as outlined on page 3 of the Help file.

Kind regards,

David
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Last edited by David McBean; 9th April 2010 at 07:50 AM.
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Old 9th April 2010, 12:34 PM   #1045
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Thank you David. I am going out of town today so I won't be able to play with this until Sunday but look forward to it. The midrange horns in the pix above where not modeled. We just picked the tractrix flare and built them. I think we got very lucky as they sound great and mearsure very flat. I thought this time though, with the bass horns, I would be more mindfull.

I will use the same build style though.....flat sides on a quarter sphire.
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Old 9th April 2010, 07:42 PM   #1046
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Default Rounding Errors?

Hi David,

I think I may have found a minor bug, or rounding error: when looking at a TH designed by Josh Ricci I changed the simulation from 3 to 4 segments by splitting the area difference, and dividing the length in 2. It seems to me, that for a conical horn the volume should not have changed.

Please, take a look at the attached picture.

Regards,
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Old 10th April 2010, 05:57 AM   #1047
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When looking at a TH designed by Josh Ricci I changed the simulation from 3 to 4 segments by splitting the area difference, and dividing the length in 2. It seems to me, that for a conical horn the volume should not have changed.
Hi Oliver,

To split a conical segment into two equal-length sub-segments, the radius average rather than the area average should be used to determine the midpoint cross-sectional area. This means that the value for S3 in your 4 segment tapped horn example becomes 999.85 sq cm, not 1043.71 sq cm.

Using S3 = 999.85 sq cm, the volume of the 4 segment horn is identical to that for the 3 segment horn, as expected.

Kind regards,

David
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Last edited by David McBean; 10th April 2010 at 05:59 AM.
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Old 10th April 2010, 06:32 AM   #1048
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Originally Posted by djn View Post
I am going out of town today so I won't be able to play with this until Sunday but look forward to it.
Hi djn,

You might like to use a copy of the latest release - Product Number 2630-100410. Your original query prompted me to do some further testing of the Horn Segment Wizard tool - I found some operational "loose ends" which have now been tidied up.

Kind regards,

David
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Old 10th April 2010, 01:51 PM   #1049
tb46 is offline tb46  United States
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Default Posts #1046 / #1047

Hi David,

Quote from #1047: " ...To split a conical segment into two equal-length sub-segments, the radius average rather than the area average should be used to determine the midpoint cross-sectional area. ..."

Thank you for the explanation, and especially for "keeping on tidying up" your fine program.

Regards,
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Old 10th April 2010, 02:02 PM   #1050
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Will do David. Do you have any idea what flare or combination of flares would give me the lowest hz in the smallest size? I have the room for any size horn, but would like to cross as low as possible. Thanks.
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