seeking rear mounted driver for front horn

[hollowboy]

Measurements of the XT25 on a waveguide

Thanks for this link.

The dome version seems good too:

Test Peerless DX25TG09-04 (Vifa XD-270 F/4) am Waveguide WG-300 – Heissmann Acoustics

It is something I'll keep in mind for a future project.

 

[gedlee]

That looks like a very good result, although 70 dB range and 1/9 oct smooth is not detailed enough for me.

 

[gedlee]

Looks like I will have to change my position on direct radiators. That device looks as good as a CD, just less output - about 6 dB. It will have 10-12 dB less headroom, but in a home that may still be enough, but maybe not. It also doesn't go as low as a CD usually would. I can take a DE250 down to about 800 Hz.

 

[hollowboy]

The efficiency [...] is a function of the tweeter, 90ish depending on the model.

Cheers. 4dB may not seem like much, but I don't really consider designs <90dB.

I might (eventually) try something like this. It'd be a cheap way to try the multiple entry thing.

Square throat was tested, http://www.diyaudio.com/forums/mult...e-bandpass-mid-unity-horn-44.html#post5163719

I didn't see anything about square throats there. Wrong link?

Looks like I will have to change my position on direct radiators. That device looks as good as a CD, just less output

Swell. That's how it should be, but often is not (allowing new information to alter a bias).

A heavy driver on a small mounting just sounds too weak for my taste.

IMO the horn itself would be the weaker link - particularly in my case, if I make a frankenhorn with a wooden mouth and a plastic throat. I should probably add a brace to support the driver, no matter which driver I go with.

If the screw-on attachment was weak, it'd cause lots of failures in pro audio coaxials. The horn driver on mine weighs 2.72kg, and it hasn't fallen off yet 🙂

 

[AllenB]

I started using aluminium, and then plexiglass and finally polycarbonate, which works great.

for example..

 

[gedlee]

If the screw-on attachment was weak, it'd cause lots of failures in pro audio coaxials. The horn driver on mine weighs 2.72kg, and it hasn't fallen off yet 🙂

I'm not worried about the driver falling off, but the vibration of the driver mass cantilevered on the weak end of a horn. Coaxials don;t have the driver attached to just the horn end, but are mounted to the woofer so my concern doesn't apply.