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Old 25th March 2020, 03:23 PM   #10581
buildafriend is offline buildafriend  United States
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Join Date: May 2010
hi everyone. before asking for help I want to express how much I appreciate all the help in this forum. it's amazing

that said, I've come into possession of some unloaded cerwin vega SL-36B cabinets that I'm going to try to fix up and reuse as a low budget start to a reinforcement system. I've sat through a youtube tutorial on basic sealed enclosures and got moving with the wizard in Hornresp and was very pleased with the results. Now, I think I need a hand learning how to enter a folded enclosure and how to take the measurements for one. I'll gladly provide any information needed if anyone is willing to help since I need to purchase some drivers.

kindly,
- J
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Old 25th March 2020, 05:02 PM   #10582
djeddie is offline djeddie  United Kingdom
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IIRC, the HR input data for the SL36 is already on the 'net. It's either here or somewhere like the speakerplans forum. Google might help with that.
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Old 26th March 2020, 01:49 AM   #10583
buildafriend is offline buildafriend  United States
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Quote:
Originally Posted by djeddie View Post
IIRC, the HR input data for the SL36 is already on the 'net. It's either here or somewhere like the speakerplans forum. Google might help with that.
Thanks for pointing that out. I did a search and found a screenshot of the parameters that worked for someone else while entering the TS parameters for a loudspeaker that I want to experiment with. I think they simmed for 2 cabs at one time.

I don't understand how to enter "Cir." It's grayed out. The help file calls this the "free space normalised horn mouth circumference in flare cutoff frequency wavelengths."

I'm also unsure what kind of horn to tell hornresp I'm entering per fold. The wizard asks for Bessel ( same person as the filter? ), Conical, Exponential, so on..

My file is "New File"
Old-File — ImgBB
New-File — ImgBB

Last edited by buildafriend; 26th March 2020 at 01:56 AM. Reason: uploaded images
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Old 26th March 2020, 04:32 AM   #10584
Brian Steele is offline Brian Steele  Grenada
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Quote:
Originally Posted by David McBean View Post
CHANGE 2

A loudspeaker with an offset driver can now also have an offset port, an offset passive radiator or an offset stub.

Method:

1. Specify at least three segments, select the OD offset driver option and double-click the Cir or Fta label in edit mode to select the Clo closed horn mouth option. Set Vrc, Lrc, Vtc and Atc = 0.

2. Specify an offset port using Ap and Lpt, a passive radiator using Sp, Cmp, Mmp and Rmp, or an offset stub using Ap1 and Lp.
I've finally got a chance to play with this feature, and I'm liking it. I've tried a few driver / vent layouts for a vented system and it seems that, to minimize organ-pipe noise through the vent, the best position for the driver seems to be in the middle of the baffle, and the best position for the vent seems to be about halfway between the driver and the end of the baffle (see diagram). I will have to try a build like this sometime to see if the measurements back up what the sim's saying.

I have one minor recommendation for the feature - have the length of the last segment be dependent on the offset e.g., if L34 represents the offset, then increasing L34 should decrease L23. Adlusting L23 should not impact L34 though. This will allow for changing the port offset without changing the total volume of the sim.
Attached Images
File Type: png 2020-03-26.png (11.8 KB, 75 views)
File Type: png 2020-03-26 (1).png (21.3 KB, 75 views)
File Type: png 2020-03-26 (2).png (22.9 KB, 74 views)
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Old 26th March 2020, 09:35 AM   #10585
Kolbrek is offline Kolbrek  Norway
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Quote:
Originally Posted by buildafriend View Post
I don't understand how to enter "Cir." It's grayed out. The help file calls this the "free space normalised horn mouth circumference in flare cutoff frequency wavelengths."
You don't enter it; it's calculated automatically based on the dimensions of the horn and the radiation solid angle.

Quote:
Originally Posted by buildafriend View Post
I'm also unsure what kind of horn to tell hornresp I'm entering per fold. The wizard asks for Bessel ( same person as the filter? ), Conical, Exponential, so on..
For a horn section made up from two parallel and two conical sides, Parabolic is the best match.

(Bessel: German mathematician Friedrich Bessel developed functions which are used in the design of Bessel filters, and which also appear in the solution of the horn equation for Bessel horns, hence the name.)
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Old 26th March 2020, 11:01 AM   #10586
David McBean is offline David McBean  Australia
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Quote:
Originally Posted by alujoe2 View Post
I would build the horn in "gramaphone style" with facets that fold back
As previously advised the maximum mouth flare tangent angle will remain at the current Sph and Tra limit of 90 degrees - the horn profile will not fold back.

Quote:
Originally Posted by alujoe2 View Post
therefore I was asking for T = 0.4
Not sure how much use it will be, but the lower limit will be set at T = 0.4.
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Old 26th March 2020, 11:09 AM   #10587
David McBean is offline David McBean  Australia
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Quote:
Originally Posted by Brian Steele View Post
I have one minor recommendation for the feature - have the length of the last segment be dependent on the offset e.g., if L34 represents the offset, then increasing L34 should decrease L23. Adlusting L23 should not impact L34 though.
I will have a look when I get a chance - it probably won't be in the the next update though, which is close to being released.
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Old 26th March 2020, 11:21 AM   #10588
David McBean is offline David McBean  Australia
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Quote:
Originally Posted by more10 View Post
I need some help with reasonable values for Fr1 in Loudspaker Wizard.
A reasonable value would be one that gives you the best response... :-).

Some information on airflow resistivity values is attached (not necessarily applicable to loudspeakers).
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File Type: png Attach_1.png (111.0 KB, 66 views)
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Old 26th March 2020, 11:44 AM   #10589
David McBean is offline David McBean  Australia
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Quote:
Originally Posted by more10 View Post
I had expected a rise in response at a quarter wavelength for the cylindrical dogbox.
Have you compared the Hornresp result to that generated by AkAbak?
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Old 26th March 2020, 01:48 PM   #10590
buildafriend is offline buildafriend  United States
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Quote:
Originally Posted by Kolbrek View Post
You don't enter it; it's calculated automatically based on the dimensions of the horn and the radiation solid angle.



For a horn section made up from two parallel and two conical sides, Parabolic is the best match.

(Bessel: German mathematician Friedrich Bessel developed functions which are used in the design of Bessel filters, and which also appear in the solution of the horn equation for Bessel horns, hence the name.)
Thanks! Any idea why my entire upper right side is grayed out? Links to my images are at the end of my recent post.
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