Time Window and a microtower question

trumper · 26th January 2013, 08:18 PM

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?

planet10 · 26th January 2013, 08:23 PM

Smilar. Time windows were more like 120 degree splay.

dave

trumper · 26th January 2013, 10:17 PM

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?

cogitech · 27th January 2013, 02:39 PM

FWIW, my "Castle" style (one top mount EL70) microTowers sound great about 3" from the wall.

planet10 · 27th January 2013, 10:45 PM

Quote:

Originally Posted by trumper

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.

dave

planet10 · 27th January 2013, 11:13 PM

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

trumper · 28th January 2013, 05:07 PM

Thanks Planet10!. Now if I can locate some plastic pipe near Ottawa....

chrisb · 28th January 2013, 05:17 PM

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

Available in 6 / 8 / 10 & 12" diameter

Whether plastic or paper, cutting lengthwise nice & straight can take some time jigging up.

planet10 · 28th January 2013, 05:37 PM

Quote:

Originally Posted by chrisb

did not the Time Windows ( and Spica SC50) use "Sonotube" type compressed paper concrete forms

Yes.

dave

26th January 2013, 08:18 PM	#1
trumper diyAudio Member Join Date: Oct 2011 Location: Eastern Ontario	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?

26th January 2013, 08:23 PM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 5	Smilar. Time windows were more like 120 degree splay. dave __________________ community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

28th January 2013, 05:17 PM	#8
chrisb diyAudio Member Join Date: Aug 2002 Location: victoria BC	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 Available in 6 / 8 / 10 & 12" diameter Whether plastic or paper, cutting lengthwise nice & straight can take some time jigging up. __________________ you don't really believe everything you think, do you? community sites t-linespeakers.org, frugal-horn.com commercial site planet10-HiFi

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26th January 2013, 10:17 PM	#3
trumper diyAudio Member Join Date: Oct 2011 Location: Eastern Ontario	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?

27th January 2013, 02:39 PM	#4
cogitech diyAudio Member Join Date: Jan 2011 Location: Kamloops, BC	FWIW, my "Castle" style (one top mount EL70) microTowers sound great about 3" from the wall.

28th January 2013, 05:07 PM	#7
trumper diyAudio Member Join Date: Oct 2011 Location: Eastern Ontario	Thanks Planet10!. Now if I can locate some plastic pipe near Ottawa....

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