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Keystone Sub Using 18, 15, & 12 Inch Speakers
Keystone Sub Using 18, 15, & 12 Inch Speakers
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Old 25th June 2011, 06:31 PM   #91
tb46 is offline tb46  United States
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Hi Art,

I agree in a true FLH the Keystone exit may do more harm than good, but we are talking about terminating what amounts to be a foreshortened expanding duct that is terminated by a heavily undersized mouth. I just wish I could model the Keystone exit in AkAbak, but sofar the light has not come on.

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Old 25th June 2011, 07:31 PM   #92
Djim is offline Djim  Netherlands
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Quote:
Originally Posted by tb46 View Post
I just wish I could model the Keystone exit in AkAbak, but sofar the light has not come on.
That's one of the reasons why I asked Art if he had measured the impedance.
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Old 28th June 2011, 06:39 PM   #93
weltersys is offline weltersys  United States
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Quote:
Originally Posted by tb46 View Post
Hi Art,
I took another stab at drawing your Keystone sub from the work sketches you provided in Post #63. I added mm dimensions per djim's request.
Regards,

Oliver,

The corrections you made in the plans in Post # 85 (Drawing Correction #1) look good, nice job, thanks again.

Only difference of note is the bottom of the Keystone exit is 12.75 inch as built (323.85 mm), not 12.5 inch.

The difference of 1/4 inch there is not a concern.

The Keystone exit should be rounded over both sides.

Also, the braces are important, anyone attempting to build a similar cabinet should refer to the pictures in post #63.

Art Welter
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Old 28th June 2011, 07:41 PM   #94
tb46 is offline tb46  United States
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Hi Art,

I added your comments in note form to the drawing, if you find anything else, or want to add anything let me know.

Regards,
Attached Files
File Type: pdf Keystone_sub_dwg_corrections_2.pdf (70.8 KB, 1030 views)
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Last edited by tb46; 28th June 2011 at 07:48 PM.
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Old 30th June 2011, 05:41 PM   #95
NEO Dan is offline NEO Dan  United States
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Hi Oliver,
Can you add dimensions or HR input values to the pdf so we may look for alternate drivers?
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Dan
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Old 30th June 2011, 06:44 PM   #96
tb46 is offline tb46  United States
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Hi NEO Dan,

It'll take me a little bit of time to do that, and I don't quite know if I'll have the time today. Anyway, I'll attach my Hornresp Input screen for the original drawing I made. As far as the tapped horn aspect is concerned, there should not be enough difference between the two drawings to matter. Be warned though, Hornresp does not have any way (I know of) to model the Keystone exit, so all you're going to get is a general idea for a tapped horn with a similarly sized mouth located at the front at the end of the horn path.

Regards,
Attached Images
File Type: jpg Keystone_guess_Hornresp_Input.jpg (37.6 KB, 2059 views)
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Last edited by tb46; 30th June 2011 at 06:46 PM.
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Old 30th June 2011, 08:19 PM   #97
tb46 is offline tb46  United States
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Found a moment (please, see the note in Post #96):

Regards,
Attached Files
File Type: pdf Keystone_sub_dwg_corrections_2_Hornresp.pdf (17.0 KB, 972 views)
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Old 30th June 2011, 10:56 PM   #98
NEO Dan is offline NEO Dan  United States
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Thanks Oliver
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Dan
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Old 23rd December 2011, 10:59 PM   #99
PASC is offline PASC  Brazil
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Hi!
I'm making one.

Need to round opening both sides and attach braces to the front

Will try the 18Sound 18NLW9600 in it (have an offer of local dealer).
Attached Images
File Type: jpg keystone1.jpg (32.7 KB, 1958 views)
File Type: jpg keystone2.jpg (22.9 KB, 1923 views)
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Old 24th December 2011, 01:24 AM   #100
NEO Dan is offline NEO Dan  United States
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Looks good! Please post your impressions on the performance.
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Dan
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