Dynaco clone with SEAS Exotic T35 tweeter

[saschagabor]

I´ve been facinated with the Dynaco a25 for a very long time, and I´ve been on the verge of starting construction of WD25x many times these last years.

Finally I´ve made a build like this my next project, so I´m now in the process of gattering information. I would probably be using the T25CF002 tweeter, but I´m also contemplating how the Exotic T35 would fit into the mix. The original a25 did use an 35mm tweeter, after all.
Yes, the Exotic tweeter is expensive, but not that much more than the Millennium.

Any opinions on this subject would be much appreciated.

http://www.seas.no/images/stories/ex...exotic-t35.pdf

[Tytte71]

Latest edition of Hobby Hifi prooved incredibly good measurements for the T35 (FR, CSD and distortion numbers). It is also very easy to integrate into a waveduide, since the original faceplate has a flat back surface (I've opened mine to check). It should therefore be an easy thing to let the T35 cover 1-1,2kHz flat up.

Cheers

[saschagabor]

Great, I´ll check it out!

[jerome69]

You will use this woofer ?
Seas Prestige A26RE4 (H1411) 10" Paper Cone: Madisound Speaker Store

The T35 is much better for this setup, better low end response.

[saschagabor]

Yep, that´s the one.

T35 should be a good match, but from what I read T25CF002 also does a great job, plus it´s well documented.

[jerome69]

Could be useful ?
Dynaco Enclosure Plans
The crossover is very simple.

[saschagabor]

I´m thinking more in the lines of this:
Designing Loudspeakers - WD25A The Final Crossover

[Tytte71]

Originally Posted by saschagabor

Yep, that´s the one.

T35 should be a good match, but from what I read T25CF002 also does a great job, plus it´s well documented.

I would not select the A26 for an application with the T35. In my opinion the T35 deserves matching with a high quality high efficiency midbass.
Honestly, I can't find a reason for using the A26 for any application looking at the T/S data alone - must add that I have never listened to it.
Picking a midbass with a sensitivity of 95/96dB+ would make sense when concidering a -6dB baffle step.

[saschagabor]

I agree that it's probably not the ideal driver (by today's standards) for the expensive T35, but I'm in now way planing on gluing the drivers to the baffle...

The Millennium tweeter is a great tweeter, but it's priced so close to T35 (which is a driver I'd like to test in other settings, in time) that it's hard to justify not spending that little extra.

I'm not contemplating on building a Dynaco a25 clone thinking is the ultimate loudspeaker, but to get experience with older designs and their pros/cons. I'd like to experience a remake of a legend. One of the cons is definitely that it's not all that efficient. It is however designed to sit close to the back wall, thus not taken down too much in sensitivity.
One of my ideas is to make a stand mounted speaker based on the 'dual compartment cabinet' of the WD25t. This would mean a wider baffle and some tinkering with the crossover.

Also, any recommendations of (wortfor of the T35) 10" drivers suitable for a 2-way, that's both efficient and does a great job in an aperiodic enclosure, would be much appreciated. Recommendations for suitable 8" drivers would also be nice, but that's nowhere as hard to find.

[DrDyna]

Originally Posted by jerome69

Could be useful ?
Dynaco Enclosure Plans
The crossover is very simple.

Beautifully simple crossover, nothing on the woofer at all. I had a design in my head that incorporated that woofer (no crossover) to a big Heil amt with a simple crossover and l-pad like that.

As far as this project, that crossover is so simple it would only cost 20 bucks to build them and try it, it might be fun to have it on hand to play with