Motor mounted phase plug

trusound · 24th November 2010, 01:36 AM

So I was bored today and had some crazy sleep deprived idea from the night before..

So I grabbed 2 Tupperware bowls that had a similar shape that I wanted and taped them to the back of the PM6A's...

And to my surprise it made a difference.. not huge or monumental by any means.. but from a subjective level.. I gained more focus and oddly enough my center image raised a foot..

I plan on making a better plug with a better shape this weekend but wanted to know if anybody else has tried the same thing?

SORRY FOR THE CRAPPY CELL PHONE PICS!!!

planet10 · 24th November 2010, 02:20 AM

It streamlines the back of the driver... reducing turbulence, and reflected time-smear when in an enclosure and early diffraction in an OB.

dave

trusound · 24th November 2010, 02:31 AM

dave.... I have seen that pic a million times and yet have never noticed that motor shape until you just mentioned it.... lol

twest820 · 24th November 2010, 03:45 AM

I've contemplated doing something like this for quite some time but never got around to it. trusound, do you have directivity measurements with and without the tupperware?

Dave, shouldn't it be laminar flow at most SPLs? Off the top of my head I'm not coming up with Reynolds numbers high enough for turbulent flow.

TerryO · 25th November 2010, 04:38 AM

A cone made up of felt might work even better.

Best Regards,
TerryO

planet10 · 25th November 2010, 05:21 AM

Quote:

Originally Posted by twest820

Dave, shouldn't it be laminar flow at most SPLs? Off the top of my head I'm not coming up with Reynolds numbers high enough for turbulent flow.

Don't know. Just like on a baffle thou, sharp edges cause diffraction.

dave

trusound · 25th November 2010, 03:09 PM

Quote:

Originally Posted by TerryO

A cone made up of felt might work even better.

Best Regards,
TerryO

strictly just felt? so it's close to being acoustically transparent or a phase plug wrapped in felt?

trusound · 25th November 2010, 03:15 PM

Quote:

Originally Posted by twest820

I've contemplated doing something like this for quite some time but never got around to it. trusound, do you have directivity measurements with and without the tupperware?

Dave, shouldn't it be laminar flow at most SPLs? Off the top of my head I'm not coming up with Reynolds numbers high enough for turbulent flow.

Just going from my understanding this should be more laminar flow... I'll get some directivity measurements once I get real plugs made with a better shape and contour..

24th November 2010, 01:36 AM	#1
trusound diyAudio Member Join Date: Aug 2005 Location: Missouri	Motor mounted phase plug So I was bored today and had some crazy sleep deprived idea from the night before.. So I grabbed 2 Tupperware bowls that had a similar shape that I wanted and taped them to the back of the PM6A's... And to my surprise it made a difference.. not huge or monumental by any means.. but from a subjective level.. I gained more focus and oddly enough my center image raised a foot.. I plan on making a better plug with a better shape this weekend but wanted to know if anybody else has tried the same thing? SORRY FOR THE CRAPPY CELL PHONE PICS!!! __________________ Randy Kunin www.soundsbydesign.net

24th November 2010, 02:20 AM	#2
planet10 frugal-phile(tm) diyAudio Moderator Join Date: Oct 2001 Location: Victoria, BC, NA, Sol III Blog Entries: 4	It streamlines the back of the driver... reducing turbulence, and reflected time-smear when in an enclosure and early diffraction in an OB. dave __________________ community sites t-linespeakers.org, frugal-horn.com ........ commercial site planet10-HiFi p10-hifi forum here at diyA

24th November 2010, 02:31 AM	#3
trusound diyAudio Member Join Date: Aug 2005 Location: Missouri	dave.... I have seen that pic a million times and yet have never noticed that motor shape until you just mentioned it.... lol __________________ Randy Kunin www.soundsbydesign.net

25th November 2010, 04:38 AM	#5
TerryO diyAudio Member Join Date: Nov 2002 Location: Seattle,Wash.	A cone made up of felt might work even better. Best Regards, TerryO __________________ "If you have to ask why, then you're probably on the right track." quote from Terry Olson's DIYaudio Forum application

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24th November 2010, 03:45 AM	#4
twest820 diyAudio Member Join Date: Jun 2009 Location: Orygun	I've contemplated doing something like this for quite some time but never got around to it. trusound, do you have directivity measurements with and without the tupperware? Dave, shouldn't it be laminar flow at most SPLs? Off the top of my head I'm not coming up with Reynolds numbers high enough for turbulent flow.

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