Pros/Cons to an OB Dayton Reference line array with an IB sub? - Page 2

bombardon73 · 29th May 2005, 05:04 PM

The modfication of the PT2 sounds very simple but is a b.... to execute. It all comes down to this, the PT2 has some bad inner damping. The cavity behind the mylar foil has to be damped with felt (I hope this is the correct translation of the dutch word "vilt").

The results can be seen in these pics.

bombardon73 · 29th May 2005, 05:18 PM

And, here is the decaygrafic of the normal version

bombardon73 · 29th May 2005, 05:29 PM

And, the decaygrafic of the modified Pt2

bombardon73 · 29th May 2005, 05:33 PM

As you can see, the frequency response is improved, it can now be easily xovered at 2,5 hz or even 2khz.
In the decaygrafic you can see how much the resonancefrequency decay has been improved.

Oh, one more thing. This mod seen here is done with the old version of the Pt2.
Soon I'll be posting the 1st results of the new version of the Pt2.

Paul W · 29th May 2005, 09:20 PM

mazeroth,
Here's a link...

4-way OB

Paul W · 29th May 2005, 09:32 PM

...and here is the next generation which, if I get up early enough, may be running tomorrow. (the guy on the right is just a test proto, the other one is final-in-process)

As you can see I like the OB/IB combo enough to do it again.

catapult · 30th May 2005, 01:46 AM

Interesting Paul! What are you doing? Loading a line-source ribbon with a waveguide? What drivers are you using?

dwk123 · 30th May 2005, 08:21 PM

Quote:

Originally posted by catapult
Interesting Paul! What are you doing? Loading a line-source ribbon with a waveguide? What drivers are you using?

I'm playing around with some of the monsoon planar drivers in a more-or-less OS waveguide, and my initial results are very promising. I'm hoping to have my 'more advanced prototypes' making noise tomorrow. The combination of controlled directivity and better LF loading for a lower xover freq make this a great combo. I think the BG's could also benefit.

Makes for pretty honkin' big speakers, though.

Paul W · 30th May 2005, 10:26 PM

Yes, ribbon with a little guidance. The "first final" is much more shallow than the proto in that picture...at least on that baffle it was too directional.

Drivers are W26's and a scratch 1" x 45" x 5 micron ribbon.

Audiophilenoob · 31st May 2005, 03:40 PM

What kind of dispersion are you expecting from with that waveguide??

any noticable SQ deficencies vs. without a waveguide?

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29th May 2005, 05:33 PM	#14
bombardon73 diyAudio Member Join Date: Oct 2004	As you can see, the frequency response is improved, it can now be easily xovered at 2,5 hz or even 2khz. In the decaygrafic you can see how much the resonancefrequency decay has been improved. Oh, one more thing. This mod seen here is done with the old version of the Pt2. Soon I'll be posting the 1st results of the new version of the Pt2.

29th May 2005, 09:20 PM	#15
Paul W diyAudio Member Join Date: Oct 2003 Location: North Georgia	mazeroth, Here's a link... 4-way OB

29th May 2005, 09:32 PM	#16
Paul W diyAudio Member Join Date: Oct 2003 Location: North Georgia	...and here is the next generation which, if I get up early enough, may be running tomorrow. (the guy on the right is just a test proto, the other one is final-in-process) As you can see I like the OB/IB combo enough to do it again.

30th May 2005, 01:46 AM	#17
catapult diyAudio Member Join Date: Dec 2002 Location: Planet Earth	Interesting Paul! What are you doing? Loading a line-source ribbon with a waveguide? What drivers are you using?

30th May 2005, 10:26 PM	#19
Paul W diyAudio Member Join Date: Oct 2003 Location: North Georgia	Yes, ribbon with a little guidance. The "first final" is much more shallow than the proto in that picture...at least on that baffle it was too directional. Drivers are W26's and a scratch 1" x 45" x 5 micron ribbon.

31st May 2005, 03:40 PM	#20
Audiophilenoob diyAudio Member Join Date: May 2005 Location: NC	What kind of dispersion are you expecting from with that waveguide?? any noticable SQ deficencies vs. without a waveguide?