Calling Planet10... (fullrange question)

Duo · 8th April 2007, 07:00 AM

Today I was out and about and picked up a pair of these speakers at the second hand shop. Looking through the grille cloth revealed a single 12" driver with a vented dustcap and accordion surround. It looked a lot like many Altecs I'd seen.

Unfortunately, these are some cheap 'who-knows-what' speakers.

I'm trying them out with the backs off and stuffing out and driving with a transconductance amplifier. With some tweaking I think these could really sound alright on a transconductance amp.

What I'd really like to know is; who made them? Where did they come from?

They sure look cheap!

bigwill · 8th April 2007, 03:13 PM

That magnet looks just like the magnet from a wharfedale driver I had.

dnsey · 8th April 2007, 04:00 PM

The magnet is similar to Wharfedale (but slimmer for its size0, but the rest is nothing like one!

Geoff H · 9th April 2007, 12:02 AM

That square magnet should give it away. Wharfedale is the only one I am aware of. Agreed, nothing Wharfedale about the rest of it.

What's on the logo on the grill cloth? The cabinet should keep someone warm for about 20 mins.

Good drivers to tweak though. Treat the surrounds, remove the shining dome, and treat the cones. Probably best on OB, as big as you like to go.

Have fun with them. Geoff

chrisb · 9th April 2007, 12:44 AM

I could be all washed up, but the grille cloth and enclosure margin details remind me of vintage (late 60/early 70's) Norecsco speakers, in which case the drivers could be OEM RSC (Radio Speakers of Canada)

Duo · 9th April 2007, 01:07 AM

They do look kind of noresco/wharefedale/who knows what..

I was contemplating removing the dustcap to see what they sound like... Open baffle is exactly what I had in mind, along with an amplifier adjusted for critical damping.

I find that the suspension is extremely stiff on these; far stiffer than typical drivers of their sort. They are terribly thin in the bass region no matter what I do, I'm thinking that if the suspensions were treated with something to soften them up, and broken in for a while, they may be soft enough.

They are essentially all mid-range, with the ability to do nice high end if driven a little strong in that range. (the transconductance amplifier helps here along with the bass.)

Keep the ideas coming, hehe.

Geoff H · 9th April 2007, 01:54 AM

OK Mod time. Can you take a close up shot of the surround. And if possible, one with the light coming in from behind. I want to see how translucent the rolls are. See if they are like this.

Where's Dave? He might want that Ultimate firewood.

Geoff

Duo · 9th April 2007, 04:15 AM

Here are more pictures. This time, macro shots.

There are two of the surround, one with flash and the other without, and one of the dustcap center.

The surround is opaque.

Duo · 9th April 2007, 04:22 AM

Upon closer inspection, the surround is simply an extension of the cone paper itself, not a separate attached piece.

It is very heavily doped with a mildly sticky green coating, not unlike what you see on many other drivers. It's a bit shiny too.

planet10 · 9th April 2007, 04:31 AM

Quote:

Originally posted by Duo
They do look kind of noresco/wharefedale/who knows what..

I've got some of those... mine are made by CTS (in 1974) ... do yours have a code 137 9999

BTW... older Norescos are very worthy of scooping up. Yjr 2 smallest (1 way) have Philips 5 or 7" with whizzer, larger ones Isophons. One of the bigger ones have 8x12" coax.

dave

8th April 2007, 07:00 AM	#1
Duo diyAudio Member Join Date: Jun 2002 Location: Victoria, BC, Canada	Calling Planet10... (fullrange question) Today I was out and about and picked up a pair of these speakers at the second hand shop. Looking through the grille cloth revealed a single 12" driver with a vented dustcap and accordion surround. It looked a lot like many Altecs I'd seen. Unfortunately, these are some cheap 'who-knows-what' speakers. I'm trying them out with the backs off and stuffing out and driving with a transconductance amplifier. With some tweaking I think these could really sound alright on a transconductance amp. What I'd really like to know is; who made them? Where did they come from? They sure look cheap!

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8th April 2007, 03:13 PM	#2
bigwill diyAudio Member Join Date: Dec 2004 Location: UK	That magnet looks just like the magnet from a wharfedale driver I had.

8th April 2007, 04:00 PM	#3
dnsey diyAudio Member Join Date: Mar 2004 Location: Shropshire, England	The magnet is similar to Wharfedale (but slimmer for its size0, but the rest is nothing like one!

9th April 2007, 12:02 AM	#4
Geoff H diyAudio Member Join Date: Oct 2006	That square magnet should give it away. Wharfedale is the only one I am aware of. Agreed, nothing Wharfedale about the rest of it. What's on the logo on the grill cloth? The cabinet should keep someone warm for about 20 mins. Good drivers to tweak though. Treat the surrounds, remove the shining dome, and treat the cones. Probably best on OB, as big as you like to go. Have fun with them. Geoff

9th April 2007, 12:44 AM	#5
chrisb diyAudio Member Join Date: Aug 2002 Location: victoria BC	I could be all washed up, but the grille cloth and enclosure margin details remind me of vintage (late 60/early 70's) Norecsco speakers, in which case the drivers could be OEM RSC (Radio Speakers of Canada)

9th April 2007, 01:07 AM	#6
Duo diyAudio Member Join Date: Jun 2002 Location: Victoria, BC, Canada	They do look kind of noresco/wharefedale/who knows what.. I was contemplating removing the dustcap to see what they sound like... Open baffle is exactly what I had in mind, along with an amplifier adjusted for critical damping. I find that the suspension is extremely stiff on these; far stiffer than typical drivers of their sort. They are terribly thin in the bass region no matter what I do, I'm thinking that if the suspensions were treated with something to soften them up, and broken in for a while, they may be soft enough. They are essentially all mid-range, with the ability to do nice high end if driven a little strong in that range. (the transconductance amplifier helps here along with the bass.) Keep the ideas coming, hehe.

9th April 2007, 04:15 AM	#8
Duo diyAudio Member Join Date: Jun 2002 Location: Victoria, BC, Canada	Here are more pictures. This time, macro shots. There are two of the surround, one with flash and the other without, and one of the dustcap center. The surround is opaque.

9th April 2007, 04:22 AM	#9
Duo diyAudio Member Join Date: Jun 2002 Location: Victoria, BC, Canada	Upon closer inspection, the surround is simply an extension of the cone paper itself, not a separate attached piece. It is very heavily doped with a mildly sticky green coating, not unlike what you see on many other drivers. It's a bit shiny too.

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