Looking for a photo of the front of the Selenium 15" Coax

Cal Weldon · 31st January 2005, 09:37 PM

I can't seem to find one anywhere on the net. Just the back and side shots are available.

Appreciate it if you have one, I'd like to see what they did with the tweeter.

Cal

rcavictim · 31st January 2005, 11:42 PM

I have the 12CO1P Selenium coaxials and can post a picture for you. That is exactly the same as the 15". All you see is a sonically transparent dustcap. The HF horn is a conical hiding just behind this cap. The cap moves with the woofer cone. It is a clever (and IMO better) way to keep out dust. The other method was to use a felt washer between the moving woofer cone and the stationary horn.

rcavictim · 1st February 2005, 12:13 AM

Here is a picture of the front of the 12 coaxial. I could not get the camera to image behind the dustcap but with a strong flashlight held up against the dustcap you can just see the horn and throat immediately behind it. The horn mouth looks to be about 2-1/2" diameter at the mouth. I think the crossover is at about 2K on these with the factory crossover.

GM · 1st February 2005, 12:18 AM

The spec sheet has a 3/4 front view, but like RCAvictim noted, all you see is a dustcap that's supposedly acoustically transparent.
http://www.partsexpress.com/pdf/264-392.pdf

GM

Saurav · 1st February 2005, 02:33 AM

Here's a picture of a 12CX with the dustcap removed. You can also see where I ripped a hole in the cone

The white dot in the middle is the tip of the tweeter's phase plug reflecting the flash.

I thought the treble sounded a little cleaner without the dustcap.

johninCR · 1st February 2005, 04:19 AM

The metal horn on the 15's stick out further than shown in the pics for the 12's. That dust cap is NOT acoutically transparent. It attentuates the HF significantly. Please let me know if you figure out some easy mods to smooth that tweeter. I'll probably end up mounting another tweeter right on the end of that metal horn since it is quite solid on the 15's. Sorry I can't upload any pics for you.

GM · 1st February 2005, 04:01 PM

Quote:

That dust cap is NOT acoutically transparent.

Hence my 'supposedly' caveat.

When asked, for HIFI apps I always recommend removing these and/or the bug screens in compression drivers.

Quote:

Please let me know if you figure out some easy mods to smooth that tweeter.

Not familiar with this one, but for HIFI apps, damping with Dammar or similar smoothes any metal or composite diaphragm I've tried it on. For really severe modes, silicon caulk has worked well for me.

GM

Cal Weldon · 1st February 2005, 07:48 PM

Thanks to all who answered.
I kind of figured it must be a conical horn in behind there.

Cal

JohnG · 1st February 2005, 11:51 PM

Look here for an extensive report on the HE12.1. One of the pictures is of a 12" Selenium coax with the dust cap removed. It shows a horn that protrudes well past the attachment of the voice coil to the cone.

http://www.cognitivevent.com/av_he12.html

John

31st January 2005, 09:37 PM	#1
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Looking for a photo of the front of the Selenium 15" Coax I can't seem to find one anywhere on the net. Just the back and side shots are available. Appreciate it if you have one, I'd like to see what they did with the tweeter. Cal __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting

31st January 2005, 11:42 PM	#2
rcavictim diyAudio Member Join Date: Jun 2004 Location: Cool end of a soldering iron NW of Toronto	I have the 12CO1P Selenium coaxials and can post a picture for you. That is exactly the same as the 15". All you see is a sonically transparent dustcap. The HF horn is a conical hiding just behind this cap. The cap moves with the woofer cone. It is a clever (and IMO better) way to keep out dust. The other method was to use a felt washer between the moving woofer cone and the stationary horn. __________________ I.Q.Test. Have you ever purchased a recreational snowmobile?

1st February 2005, 12:18 AM	#4
GM diyAudio Member Join Date: Jun 2003 Location: Chamblee, Ga.	The spec sheet has a 3/4 front view, but like RCAvictim noted, all you see is a dustcap that's supposedly acoustically transparent. http://www.partsexpress.com/pdf/264-392.pdf GM __________________ Loud is Beautiful if it's Clean! As always though, the usual disclaimers apply to this post's contents.

1st February 2005, 04:19 AM	#6
johninCR diyAudio Member Join Date: Apr 2004 Location: Costa Rica	The metal horn on the 15's stick out further than shown in the pics for the 12's. That dust cap is NOT acoutically transparent. It attentuates the HF significantly. Please let me know if you figure out some easy mods to smooth that tweeter. I'll probably end up mounting another tweeter right on the end of that metal horn since it is quite solid on the 15's. Sorry I can't upload any pics for you. __________________ Everyone has a photographic memory. It's just that most are out of film.

1st February 2005, 07:48 PM	#8
Cal Weldon Speakerholic diyAudio Moderator Join Date: Jan 2004 Location: British Columbia	Thanks to all who answered. I kind of figured it must be a conical horn in behind there. Cal __________________ Next stop: Margaritaville Some of Cal's stuff \| Cal Weldon Consulting


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1st February 2005, 02:33 AM	#5
Saurav diyAudio Member Join Date: Sep 2002 Location: Oregon, USA	Here's a picture of a 12CX with the dustcap removed. You can also see where I ripped a hole in the cone The white dot in the middle is the tip of the tweeter's phase plug reflecting the flash. I thought the treble sounded a little cleaner without the dustcap.

1st February 2005, 11:51 PM	#9
JohnG diyAudio Member Join Date: Mar 2002 Location: Upstate NY	Look here for an extensive report on the HE12.1. One of the pictures is of a 12" Selenium coax with the dust cap removed. It shows a horn that protrudes well past the attachment of the voice coil to the cone. http://www.cognitivevent.com/av_he12.html John

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