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Old 27th August 2012, 06:55 PM   #41
stewin is offline stewin  Kenya
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nice work patrick really neat . considering you managed to fit it under a dash.
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Old 5th September 2012, 03:05 PM   #42
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So I happened to be reading speakerplans.com and came across these threads:

Small 10" + 1" = possible? - Speakerplans.com Forums - Page 1
twin 10 + 1 - Speakerplans.com Forums - Page 1

It puts the midwoofer on a 45 degree baffle for a bit of an offset horn style loading. You could experiment with the angle, driver position, it could be configured as a tapped horn, rear ported horn, etc, and all modeled in horn resp.
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Old 5th September 2012, 07:36 PM   #43
stewin is offline stewin  Kenya
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but the above there are no specs or response shown.
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Old 6th September 2012, 03:39 PM   #44
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I happened to model the offset horn last night and really didn't have much luck. I did model a Alpha-6c in a small tapped horn and got around 6 liters and good gain to about 150 hz or so. So maybe there is something to this.

Also modeled the alpha-6c as a ported and sealed chamber BPH (bandpass horn), which is a front loaded horn with a large front chamber, and it looked pretty promising.
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Old 15th October 2012, 02:12 PM   #45
stewin is offline stewin  Kenya
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hi guys . just wondering , since paraline loading is very effecient in hf drivers.

>>>> can paraline loading be used in unity horn or synergy horn tweeters like in danleys gh60 .
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Old 15th October 2012, 03:07 PM   #46
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Quote:
Originally Posted by stewin View Post
hi guys . just wondering , since paraline loading is very effecient in hf drivers.

>>>> can paraline loading be used in unity horn or synergy horn tweeters like in danleys gh60 .
Paraline loading is no more efficient than a conical horn.

The purpose of a Paraline is to reduce vertical dispersion to only a few degrees without requiring a long throat, not what one normally wants in a Unity/Synergy horn.
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Old 16th October 2012, 05:07 AM   #47
stewin is offline stewin  Kenya
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thanks welter i much appreciated reply.
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Old 2nd September 2013, 11:49 PM   #48
grec13 is offline grec13  United States
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Default tapped midbass horn

Quote:
Originally Posted by weltersys View Post
I have built single and double TH using Eminence Kappa 10" speakers.

Below is the response curve for the single, which is only 15" x 15" x 26.5".
It weighs 72 pounds using 3/4" birch plywood.

The dual 10 version was 15" deep by 22.5" tall, 26.5" wide. For PA mid bass use, the exit could be shifted so the cabinet would be 22.5" deep and only 15" tall.

I did some distortion tests on the single, unfortunately burning a portion of the voice coil which was rubbing due to a cobby cone repair Frankensteined together that resulted in uneven voice coil alignment. Also, the test was done in 100 degree temperature with the magnet structure directly exposed to the desert sun, it was too hot to touch when it burned out. Normally I only expose the speaker to high power sine wave for about 2-3 seconds, then wait 10 seconds before advancing to the next tone. In this case, I was (slowly) typing levels, then shifting to the next frequency rather than doing screen shots and extracting info later. I think the driver easily would have easily survived the test if I would have used shorter duration sine wave tones and the driver was shaded.

The upper output is impressive for a box that size, 126 dB using 54V (365 watts @ 8 ohm) one meter with less than 10% distortion. Distortion would probably have been less with a stock Kappa 10", the box works quite well as a drum fill, crossing a pair of 4" above it at around 200 Hz. The picture shows the little 2 x4" with an EV tweeter bolted on to it, used it for side coverage on a recent show.

Art

P.S. The 45 Hz sine wave test was first, it is well below what the cabinet does well. Next test was 60 Hz, where the TH has good kick, then on up to 250 Hz.
I then typed in the frequencies for a 45 Hz and 50 Hz test, but burned up the speaker before finishing typing in the 50 Hz fundamental level, the 45 Hz test was not done.
I have build double version of Cowan 60-250hz 10TH and it sounds excellent in midbass range. Way better then Altec 7 and other FHL that I tried.
Art, can you publish your 210th plan, or can you email it to me? I want to give it a try.
Thank you,
Sergey.
zuma13oh@yahoo.com
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Old 3rd September 2013, 08:51 AM   #49
djk is offline djk
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" Way better then Altec 7"

That is only horn-loaded above 200hz?

Get real.
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Old 3rd September 2013, 11:29 AM   #50
grec13 is offline grec13  United States
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Quote:
Originally Posted by djk View Post
" Way better then Altec 7"

That is only horn-loaded above 200hz?

Get real.
Yea. No kick at all and hu-u-uge cabinet!
I also build HD15 different version, nice kick but still Cowan TH10 have better speed, definition and resolution.
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