Radian 5208c coaxial project

[AudioGeek]

lol... so its really funny. started this post and it shows the similar threads and all the threads written about the 5208c have been started by me. Just goes to show that maybe i should FINALLY start something with these drivers.

So couple of questions:

1) Using the T/S parameters I get about a -3 of 70hz in a 23L enclosure. With room gain is this really low enough for a set of bookshelf speakers?

2) Is there a company out there that does custom xovers and measurements of drivers?

3) If i wanted to add a helper woofer onto the 5208c would it be better to run the 5208c in a sealed ... say a 11L enclosure and run the 2nd woofer in a ported. Should this extra woofer be better on front next to the 5208c or on the back? I was looking at the Ciare FXC8-3. Just have to blend the responses and sensitivity of the drivers.

What is everyone's thoughts??

help!!! thanks in advance!!

[ErnieM]

Any chance you can go active? Take a look at mini dsp and a measurement mic. You'll need both to get the best out of those with the least amount of effort.

[AudioGeek]

to measure the drivers? i was going to do passive. just drive it with a small tube amp.

[3ll3d00d]

I designed a passive xo for the 5208, only have it in a test box atm and the top end measures a bit rough but it seems to work pretty well with a sub. I'm using them for surrounds btw, not sure what your plan for them is. My test enclosure is ~15L .

5208c_xo.jpg

I can post my xo if you like.

Which T/S params did you use btw? I ended up measuring mine mine but there seem to be quite a few variations out there. I got data from radian before I got mine which I can also post if that would be helpful.

[AudioGeek]

sure if you have the schematic i would love it. what are your impressions of the Radian?

[3ll3d00d]

Originally Posted by AudioGeek

sure if you have the schematic i would love it. what are your impressions of the Radian?

here you go

xo_high.png

xo_low.png

let me know if you need any other data, I have polars and obviously the raw frd/zma

I find it's a perfectly competent performer when underpinned by a sub, I designed for 20 degrees off axis and that + a gentle rolloff towards the HF helps tone down the roughness seen in the FR

[Inductor]

The Westminster Royal GR rolls down at 60Hz +/-3dB and has F6@40Hz. A nice tight BR would maintain LF, step response and power to link with a subwoofer at appropriate frequency.

[eriksquires]

Interesting, they offer a berrylium upgrade for the compression driver I believe, at one point I was very tempted to try that.

[3ll3d00d]

Originally Posted by eriksquires

Interesting, they offer a berrylium upgrade for the compression driver I believe, at one point I was very tempted to try that.

Yes they do, at double the price though.

[eriksquires]

Originally Posted by 3ll3d00d

Yes they do, at double the price though.

Which is why I thought it would be much better if you tried them first.

Actually, it didn't seem to bad when compared to the normal price for beryllium tweeters from others, and still expensive.

Best,


Erik