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Old 23rd January 2013, 10:06 PM   #1
IG81 is offline IG81  Canada
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Default Noresco/Isophon SR-2

I got these monkey coffins with the intent to experiment with the boxes, can't build much with the winter full-on, -25C today. I knew they'd have some Isophon drivers - didn't expect the PH2132E coaxial though!

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I seem to have the 4ohm version, both seem to work as well, though that cap might be somewhat tired. Very good condition overall.

I'll get to measuring the parameters, though I expect OB kind of Qts. Vas is a bit of a pain to get. Anyone measured these before, Planet10?

IG
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Old 24th January 2013, 06:14 AM   #2
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Quote:
Originally Posted by IG81 View Post
Anyone measured these before, Planet10?
Maybe. I've had 4 pair thru here, plus i have a 4 & an 8ohm single (from what was nomially a pair of Noresco).

Quite a special driver, not all that neutral but vry musical.

dave
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Old 24th January 2013, 12:22 PM   #3
IG81 is offline IG81  Canada
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Quote:
Originally Posted by planet10 View Post
Maybe. I've had 4 pair thru here, plus i have a 4 & an 8ohm single (from what was nomially a pair of Noresco).

Quite a special driver, not all that neutral but vry musical.

dave
There is a large and broad peak at 7kHz, very apparent when right on-axis, but it smooths down when moving just a bit. Wonder if it's the tweeter's natural behavior or interatcion with the fullrange/midbass. This is preceded by a dip at 5kHz, so I'm suspecting the latter, at least in parts. Maybe reversing the phase could make it a bit better. I'll have to measure drivers individually. The crossover cap is a 5F, which suggests ~8kHz nominally for the 4ohm tweeter. I also have the apparently common busted rivets on the terminal strips. The tweeter's strip is actually screwed-down, a much better choice. Past Ebay prices for these might also preclude me from keeping them!

IG
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Old 24th January 2013, 08:29 PM   #4
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Quote:
Originally Posted by IG81 View Post
I also have the apparently common busted rivets on the terminal strips. The tweeter's strip is actually screwed-down, a much better choice.
Very common. The screw is likely from someone fixing the issue. I usually use epoxy

Quote:
Past Ebay prices for these might also preclude me from keeping them!
One of the reasons a cheer always went up when i found a pair of these when i was doing vintage drivers on eBay. Most i ever pais was $60/pr (and that same day i got another pair for $30)... Most i got was $320/pr and that from a jukebox collector in Germany who needed a single to restore one of his collection.

dave
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Old 25th January 2013, 02:29 AM   #5
IG81 is offline IG81  Canada
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Quote:
Originally Posted by planet10 View Post
Very common. The screw is likely from someone fixing the issue. I usually use epoxy
The screw on the tweeter terminal "strip" seems original - it's the same golden slotted screw head as you find holding its mounting brackets.

Quote:
Originally Posted by planet10 View Post
One of the reasons a cheer always went up when i found a pair of these when i was doing vintage drivers on eBay. Most i ever pais was $60/pr (and that same day i got another pair for $30)... Most i got was $320/pr and that from a jukebox collector in Germany who needed a single to restore one of his collection.
dave
That's about the max I've seen on completed listing too - BIN to boot. Lowest BIN was ~200$.

IG
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Old 25th January 2013, 02:40 AM   #6
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Like this?

These are the older, most desirable, shallow basket aperiodic tweeters,

dave
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Old 25th January 2013, 12:29 PM   #7
IG81 is offline IG81  Canada
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Quote:
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Like this?

These are the older, most desirable, shallow basket aperiodic tweeters,

dave
That same screw yes, but a simpler, 2-terminal strip, not aperiodic AFAIK. Maybe I'll remove one tweeter to measure the fullrange/midbass on its own, I'll snap a pic.

They do have their own sound. I jammed the cabinet's vent with a bunch of poly-fill to reduce the port's output, going towards ~aperiodic for this high-Q driver. Next will be listening with the back off. I'm only listening to one speaker in mono - has a weird sense of depth at times on certain recordings. The cone tweeter's large and broad peak is very similar to what Troels Gravessen measured on the very similar Saba tweeter. Thought it is very bright-sounding on-axis, the sound itself is not too harsh, as bit of taming its amplitude would help for sure though.

IG
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Old 26th January 2013, 04:08 PM   #8
tubo is offline tubo  Philippines
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Hi guys,

This is just a perfect timing.. I have just acquired a pair of these but have not listened to them yet as im very confused where to connect the wirings. Can someone please show how to connect the cables. I just dont understand how the mid and tweeters are connected with the 5uf capacitor. Pls explain...

Attached are the pics

Thanks guys
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File Type: jpg 20130126_104818.jpg (800.5 KB, 18 views)
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Old 26th January 2013, 04:21 PM   #9
tubo is offline tubo  Philippines
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Can you also please tell me which is the positive and negative terminals of the mid and the tweeter.

Thanks guys
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Old 26th January 2013, 07:13 PM   #10
tubo is offline tubo  Philippines
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hi guys,

I was able to identify correct polarity for the mids and i suppose the terminal with the red wire on the tweeter is the positive side. Guys pls verify if im right with the tweeter polarity.

But i still could not understand how everything is wired with the 5uf cap.
It looks like that the mids are in series with the 5uf cap then to tweeter but what confuses me if they are in series is that the cap connects to the negative of the tweeter then the positive of the tweeter connects back to the positive of the mids.

can someone pls chime in... Very confused here
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