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PD.186 / 186.2
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KidCreole View Drop Down
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Joined: 06 November 2013
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Points: 3599 		Post Options Post Options   Thanks (0) Thanks(0)   Quote KidCreole Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2014 at 10:52am
Originally posted by MarjanM MarjanM wrote:

That was P-audio SN12MB. Still have those two somewhere in some boxes. My first and last encounter with P-audio.
I was at the factory in Thailand years ago talking to their tech guy. He admitted to me that he sometimes draws the graphs has he sees suited with a pencilShocked
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Points: 1485 		Post Options Post Options   Thanks (0) Thanks(0)   Quote PauliePaul Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2014 at 11:03am
Originally posted by Tweeter_Box Tweeter_Box wrote:

Originally posted by fourway hornloaded fourway hornloaded wrote:

A speaker store in Praque measured the T/S:

good-old PD186: http://www.prodance.cz/files/dl/1/1979/TS_PD186.pdf
PD 186 MARK II: http://www.prodance.cz/files/dl/8/15605/PD186_2.pdf

Interesting site, they also have measurements of RCF LF18P400 and 'G400.

I'm not sure if I'm yet ready to accept that the reincarnation of what I thought to be the greatest mid-BL 18" driver available has a Qts between 0,52 (published) and 0,67 (measured).








need to get these guys to measure old chassis pd1850 alongside new chassis Wink

Make sure they take into consideration how PD measure first though aye? Power test for two hours / measure / power test for a further two hours / measure - then take a mean value of the two sets of figures. It gives figures that reflect how the driver will perform after it's loosened up a bit.
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Pasi View Drop Down
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Joined: 25 April 2010
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Points: 2732 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pasi Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2014 at 12:42pm
Why not just use the last set of figures as that would be the closest one to real life?
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PauliePaul View Drop Down
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Points: 1485 		Post Options Post Options   Thanks (0) Thanks(0)   Quote PauliePaul Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2014 at 12:45pm
Originally posted by Pasi Pasi wrote:

Why not just use the last set of figures as that would be the closest one to real life?

Honestly not sure!! LOL
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ras i View Drop Down
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Points: 341 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ras i Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2014 at 1:27pm
Not sure what the deal is with PD at the moment, but what I know for sure is the new 186 is not the same as the old ones. I tested them myself and the new ones perform more like the fane sov 18 than the old 186. Whether or not the parameters where incorrect on the old ones, they certainly are different to the new ones which IMO is not good.

I was also present last week when the 1852s in question was tested in the lev scoops and the new chassis 1852 didn't sound as smooth as the proto ones used when the lev scoops where played in Golden Palace. Not only did they not sound as smooth they seemed to bottom out much ealier. And yes they did all have gaskets in place.
Sun Sun Sun
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Pasi View Drop Down
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Joined: 25 April 2010
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Points: 2732 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pasi Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2014 at 1:45pm
Comparing 2 things weeks apart and saying definite conclusions based on that? Yep yep...
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PauliePaul View Drop Down
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Points: 1485 		Post Options Post Options   Thanks (0) Thanks(0)   Quote PauliePaul Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2014 at 1:50pm
Originally posted by ras i ras i wrote:


I was also present last week when the 1852s in question was tested in the lev scoops.

Well, in that case, i know who you are... finally.

And, one driver did have a gasket because I fitted it retrospectively and the other didn't so a comparison test could be done.
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ras i View Drop Down
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Points: 341 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ras i Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2014 at 2:44pm
Originally posted by PauliePaul PauliePaul wrote:

Originally posted by ras i ras i wrote:


I was also present last week when the 1852s in question was tested in the lev scoops.


Well, in that case, i know who you are... finally.

And, one driver did have a gasket because I fitted it retrospectively and the other didn't so a comparison test could be done.


Didn't know my Identity was a secret

The new chassis 1852 that was tested did have gasket fitted saw that personally and the cab also had gasket fitted around the cutout.
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Tweeter_Box View Drop Down
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Points: 859 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Tweeter_Box Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2014 at 2:52pm
Originally posted by PauliePaul PauliePaul wrote:

Originally posted by Tweeter_Box Tweeter_Box wrote:

Originally posted by fourway hornloaded fourway hornloaded wrote:

A speaker store in Praque measured the T/S:

good-old PD186: http://www.prodance.cz/files/dl/1/1979/TS_PD186.pdf
PD 186 MARK II: http://www.prodance.cz/files/dl/8/15605/PD186_2.pdf

Interesting site, they also have measurements of RCF LF18P400 and 'G400.

I'm not sure if I'm yet ready to accept that the reincarnation of what I thought to be the greatest mid-BL 18" driver available has a Qts between 0,52 (published) and 0,67 (measured).








need to get these guys to measure old chassis pd1850 alongside new chassis <img src="smileys/smiley2.gif" alt="Wink" title="Wink" />


Make sure they take into consideration how PD measure first though aye? Power test for two hours / measure / power test for a further two hours / measure - then take a mean value of the two sets of figures. It gives figures that reflect how the driver will perform after it's loosened up a bit.


Dunno bout all that, but ive personally done a side by side test with old chassis and new...
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MarjanM View Drop Down
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Points: 7747 		Post Options Post Options   Thanks (0) Thanks(0)   Quote MarjanM Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2014 at 4:20pm
I am not sure the lack of gasket can make any significant difference. If the paint is thick enough and drivers are tightened properly you do not need a gasket.
Marjan Milosevic
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https://www.facebook.com/pages/MM-Acoustics/608901282527713
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fourway hornloaded View Drop Down
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Points: 60 		Post Options Post Options   Thanks (0) Thanks(0)   Quote fourway hornloaded Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2014 at 5:08pm
There you go, PD1850, PD1851 and PD1851.2.
These guys at prodance do quite a lot of measurements.

http://www.prodance.cz/files/dl/1/721/PD_1850.pdf
http://www.prodance.cz/files/dl/8/15604/PD_1851_2.pdf
http://www.prodance.cz/files/dl/1/722/TS_PD1851.pdf
http://www.prodance.cz/files/dl/1/1958/pd.1851_2011_.pdf
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levyte357- View Drop Down
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Joined: 27 July 2012
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Points: 8091 		Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357- Quote  Post ReplyReply Direct Link To This Post Posted: 06 May 2014 at 5:22pm
Some real ropey figures there.

Think he may have measurements for '50 & '50/2 reversed.




Edited by levyte357- - 06 May 2014 at 5:32pm
Global Depopulation - Alive and Killing.
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