New system in early phase

[Millstonemike]

I see it in a rectangle below the text, entitled "Attached Files".

Maybe a S/W glitch because it's my post. I don't see it in my original post right after Lasse started the topic.

[lasse]

Hi all,
thanks for the write-up on the duets!

I have read it and downloaded it on my Phone and on my computer
I am confident that you are right in that this driver is Quite unsuitable for a low-order crossing at abt 1500-2000 Hz and I thank you all for explaining that to me. Without that, I Would have gone Down the wrong road.

What I Will have to do now is to decide on What driver to choose and wonder of a paper 8” could work at 1500 Hz?

[lasse]

And I see the link in post #2

[lasse]

Actually, I can´t find any function in Xdir, adressing a "semi-spherical" baffle. Or am I missing someting here?

Regards//lasse

Your "tweeter on a stand" will create some interesting vertical polar response issues. Very narrow vertical sweet spot and lots of lobing. If you're curious, boot up XDir by Tolvan and see for yourself. Unless you're a long distance from the speakers you'll hear the tweeter and woofer sections separately. That last part is the biggest problem, as far as I'm concerned. If the lobes are small enough you might not hear them, but the separated bass and treble is bound to sound weird.

[rpb]

The distance between the tweeter and mid, or woofer needs to be kept reasonably short. When they are too far apart, the response goes crazy on the vertical axis. If you use PCD, you can see this effect. When drivers are close, there is still a null vertically around 45 degrees. Spread them apart, and there may be multiple nulls.

[critofur]

Check this this thread (and others) out : http://www.htguide.com/forum/showthr...RS28a-RS225-MT

Before you listen to folks saying the RS225 isn't good for a two way... It is possible, to make a great 2-way speaker w/the RS225-4.

EDIT: Also, consider, perhaps, a waveguide for the RS28 tweeter, if building a 2-way w/8" woofer?

[marvin]

Lasse, Curt Campbell did a spherical design some years ago. You can read his write up here:

http://www.speakerdesignworks.com/Exclamations.html

[lasse]

The cabinets are now moved from storage in my cottage to my workshop in Stockholm.

The project lives……

will be back with thoughts on driver and XO-choises

Regards// Lasse
stockholm, Sweden

[JRT]

For the upper unit, consider buying a pair of used KEF LS50 and scavenging the coaxial drivers.

[lasse]

I think that I, at least for now, have abandoned the idea of a spherical tweeter unit.

two woofers and two tweeters on two baffels…..

Regards// lasse