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Old 30th May 2012, 11:06 AM   #1131
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Join Date: Nov 2004
Location: Udine
Hello,
I'm not expert in horns, drivers and a I've a question in my mind:
at the moment I'm using a Radian 475PB in my Sterling Silver Iris clone connected with a serie 7,5 ohm resistor to match the sensivity, now I'd like to buy a seos 12" plastic horn and try to use a lower crossover frequency (about 1,2Khz or a bit less)with a 12db cut.
I'm using a 8W SE amp for the woofer and tweeter, so the power is limited.
Do you think that the Radian Driver could be any problem of power handling and linear movement? And whych is in your opinion the lower 12db crossover frequency in this conditions.
Have a nice day.
Ciao
Guglielmo
Italy
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Old 30th May 2012, 02:59 PM   #1132
Tytte71 is offline Tytte71  Norway
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Join Date: Oct 2010
I have tried the 475PB on SEOS15. In my setup the 475PB created a sibiliant sound when crossed-over lower than 1400Hz - the lower the more sibilant the sound. I used a relatively steep FIR filter. However I enjoyed the 475PB when crossed over 1500Hz+. I don't want to jump into conclusions but switching to DE250 was a lot more successful story.

Please notice the increasing distortion on the 475PB below 1,3kHz (measurements taken on a fc500Hz Le Cléac'h profile horn - http://perso.orange.fr/francis.audio2/Comparaison_1pouce.pdf). It may be a source to the problems.

Radian 475PB.jpg
B&C DE250.jpg

Last edited by Tytte71; 30th May 2012 at 03:02 PM.
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Old 31st May 2012, 06:57 AM   #1133
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Join Date: Nov 2004
Location: Udine
Hello,
I like very much my Radian's drivers (actually the cut is at 1,7Khz) but I'd like to try De250 with a lower cross over frequency, which is in your opinion the lower safe limit with a Seos12 horn and my 8w Amp using a 12db filter.
I red that the DE250 is a bit limited over 10Khz, may be necessary a super tweeter?Any suggestion?
Ciao
Guglielmo
Italy
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Old 31st May 2012, 09:09 AM   #1134
SunRa is offline SunRa  Romania
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Join Date: Aug 2004
Location: Romania
Quote:
Originally Posted by jzagaja View Post
Dr. Geddes style phase plug design stages. Optimized means all channels have OS curvature.
Hi, what are you using to simulate those designs?

And.. how do you interpret these sims?

Thanks!
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Old 31st May 2012, 09:37 AM   #1135
Tytte71 is offline Tytte71  Norway
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Join Date: Oct 2010
Quote:
Originally Posted by guglielmope View Post
Hello,
I like very much my Radian's drivers (actually the cut is at 1,7Khz) but I'd like to try De250 with a lower cross over frequency, which is in your opinion the lower safe limit with a Seos12 horn and my 8w Amp using a 12db filter.
I red that the DE250 is a bit limited over 10Khz, may be necessary a super tweeter?Any suggestion?
Ciao
Guglielmo
Italy
I also liked the Radian when using it 1500Hz+... I then prefered it over the DE250. DE250 is a safe choice but as you say, it is a little limited in the top octaves. Personally I haven't missed a super tweeter with the DE250 but it could very well be a good thing to try.
The XO frequency and filter order should be selected to give a flat power response in the transition between your tweeter and woofer.
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Old 31st May 2012, 09:39 AM   #1136
jzagaja is offline jzagaja  Poland
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Location: Szczecin
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Quote:
Hi, what are you using to simulate those designs?
And.. how do you interpret these sims?
I've used AxiDriver foir sims but I prefer compare stock plug with design plug by measuring directivity. I don't use sims anymore. This is for fun only.
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The SEOS™ Project http://www.avsforum.com/t/1291022/he...-rallying-here
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Old 31st May 2012, 05:49 PM   #1137
jzagaja is offline jzagaja  Poland
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As for the Radian 950/951-Be. For sure requires EQ in JMLC horn. Below is example of a filter built in Hypex DSP module (JMLC-200T horn).
Attached Images
File Type: png Radian-Hypex.png (37.9 KB, 613 views)
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Old 3rd June 2012, 12:40 AM   #1138
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Quote:
Originally Posted by Tytte71 View Post
I have tried the 475PB on SEOS15. In my setup the 475PB created a sibiliant sound when crossed-over lower than 1400Hz - the lower the more sibilant the sound. I used a relatively steep FIR filter. However I enjoyed the 475PB when crossed over 1500Hz+. I don't want to jump into conclusions but switching to DE250 was a lot more successful story.

Please notice the increasing distortion on the 475PB below 1,3kHz (measurements taken on a fc500Hz Le Cléac'h profile horn - http://perso.orange.fr/francis.audio2/Comparaison_1pouce.pdf). It may be a source to the problems.

Attachment 284930
Attachment 284931
Does the 475PB have a faraday ring?

Quote:
Quote:
Originally Posted by Tytte71 View Post
Hmm.. only me that would like to have SEOS with larger throat?
I think a 15" two-way is big enough as it is, so a 1" throat is perfectly fine with me.

I would however like a driver truly comparable to a TAD 2002, without the 4K/pr price tag, with the same ~13 deg exit angle to match the SEOS.

Quote:
Originally Posted by jzagaja View Post
Do you know any European alternative to Dayton RSS390HF-4?
The closest I can think of, would be the ATC SB75-375S08 or the Volt r3853

Last edited by RockLeeEV; 3rd June 2012 at 12:51 AM.
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Old 3rd June 2012, 10:50 AM   #1139
Tytte71 is offline Tytte71  Norway
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Join Date: Oct 2010
I don't know if the PB475 has Faraday ring, but that would normally have its advantage in the lowest frequencies, or?

I might have memorised a little wrong (long time since I tried the driver) - that the sibliance was pronounced already when trying 1400Hz XO. But I am confident that I had successfull results with XO at 1500. Yesterday I hooked the 475 to the SEOS 15 again and ran distorion tests indoor on the bare WG's. Measurement was done at 1m with a SPL of about 105db (have not SPL calibrated the rig). I observed that the driver has a mode at 1780Hz (48samples/octave). I then removed the backchamber and stuffed it into a damped tube and the overall distortion was severely reduced... will make a mod to the chamber and try the driver again with lower crossover after this. I did also run comparison with the DE250 and the distortion figures on this one may explain why I prefer the 475 when crossing over high

Regarding large throat on the SEOS (preferably SEOS18); By now I don't know of any alternative to the TAD2001/2002 and the 951 is a lot cheaper. I have never tried the TAD's but I do know that the upper mid and tweeter performance of the 951 outperforms any of the cheaper 1" I have tried. I can perfectly live with the beaming starting at 14/15kHz.
Distortion Radian 475PB + SEOS15 with original back chamber.png
Distortion Radian 475PB + SEOS15 with large back chamber.png
Distortion B&C DE250 + SEOS15.png
FR Radian 475PB + SEOS15.png

Edit: All tests done under exact same conditions

Last edited by Tytte71; 3rd June 2012 at 10:54 AM.
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Old 3rd June 2012, 10:57 AM   #1140
Tytte71 is offline Tytte71  Norway
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FR compared to DE250
Attached Images
File Type: png FR Radian 475PB and B&C DE250 + SEOS15.png (44.7 KB, 566 views)
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