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Old 26th January 2013, 08:18 PM   #1
trumper is offline trumper  Canada
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Default Time Window and a microtower question

Reading a lot on the net about DCM Time Windows and various restorations / clones. I remember seeing them years ago in speaker buying guides and thought the looked neat but I have never heard them.

Now seeing as I have procrastinated on building my microtowers with top mount EL70, would mounting the drivers on adjacent sides create a Time Window experience? My listening room is small and is shared for other domestic considerations (read WAF). The speakers must be close to the wall.

Thoughts?
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Old 26th January 2013, 08:23 PM   #2
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Smilar. Time windows were more like 120 degree splay.

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Old 26th January 2013, 10:17 PM   #3
trumper is offline trumper  Canada
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Does it make sense to change the angles of the microtower to match his? Would there be a noticable difference in the sound propagation?
Or am I just counting angels on the head of a pin?
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Old 27th January 2013, 02:39 PM   #4
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FWIW, my "Castle" style (one top mount EL70) microTowers sound great about 3" from the wall.
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Old 27th January 2013, 10:45 PM   #5
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Quote:
Originally Posted by trumper View Post
Does it make sense to change the angles of the microtower to match his? Would there be a noticable difference in the sound propagation?
Or am I just counting angels on the head of a pin?
Keep the cross-section the same (and not too radical) and you will be fine with changing the shape of the cross-section. You could even make it time window shape, with an appropriate piece of curved material.

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Old 27th January 2013, 11:13 PM   #6
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Here is a 1st approximation. One could likely get a close result with 10 or 12" SonoTube (or similar) by pulling apart or pushing together cut edges as necessary. You probably can't get 11".

A pieve of 10" or 12" PVC would be ideal, increasing or decreasing the front splay or moving the intersection of the baffle with the tube. Target is about 54 in^2, one would need to accomodate some internal structure and bracing to make the build easier (in which a piece of 12" ID PVC would be ideal.

Here is a 4' chunk. If you are careful with your length wise cut this would be close to perfect.

PVC 12" Pipe, 4' section

dave
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File Type: gif time-window-shaped-uTower.gif (6.3 KB, 75 views)
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Old 28th January 2013, 05:07 PM   #7
trumper is offline trumper  Canada
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Thanks Planet10!. Now if I can locate some plastic pipe near Ottawa....
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Old 28th January 2013, 05:17 PM   #8
chrisb is offline chrisb  Canada
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did not the Time Windows ( and Spica SC50) use "Sonotube" type compressed paper concrete forms for the curved sections?

Home Depot

Quikrete | Quiktube Building Forms 8 feet x 8 inch | Home Depot Canada

Click the image to open in full size.

Available in 6 / 8 / 10 & 12" diameter

Whether plastic or paper, cutting lengthwise nice & straight can take some time jigging up.
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Old 28th January 2013, 05:37 PM   #9
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did not the Time Windows ( and Spica SC50) use "Sonotube" type compressed paper concrete forms
Yes.

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