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Multi-Way Conventional loudspeakers with crossovers

New guy needs help with Sansui SP-200 speakers
New guy needs help with Sansui SP-200 speakers
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Old 1st July 2017, 08:01 PM   #1
abubba is offline abubba  United States
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Default New guy needs help with Sansui SP-200 speakers

Just inherited two beautiful Sansui SP-200 speakers. I don't know when they were played last. Both were still connected to a Pioneer Amp, turntable, and 25 disc cd player when I picked them up, so they must have been working at one point. Both cabinets are like new, inside is clean and intact, crossover shows no burned caps, broken wires, coils look new, everything is correct. Problem is the 2-5" squakers and 2-horn tweeters seem to be working but the 12" woofer is not. This is the problem with both speakers which seems odd to me that both would have the very same problem. I've read several articles about people re-capping the crossovers and cleaning. But since all caps look like new, no burn or leakage, and all connections look good I hesitate doing this. What type of cleaning agent would you guys recommend to clean the switch contacts? I've tried both speakers on two other receivers and the same condition exists. Are these speakers worth the trouble or should I just thrash them? They just look to good to be bad.

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Old 1st July 2017, 08:22 PM   #2
planet10 is offline planet10  Canada
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New guy needs help with Sansui SP-200 speakers
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Connect the woofers directly to the amplifier to see if they are working. You can also use a multimetre to measure the DC Resistance. If not between 3-15 Ω there is likely something broken.

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Old 1st July 2017, 10:45 PM   #3
rayma is online now rayma  United States
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Quote:
Originally Posted by abubba View Post
Problem is the 2-5" squakers and 2-horn tweeters seem to be working
but the 12" woofer is not. This is the problem with both speakers
If you have no meter, connect a D cell briefly across the speaker system terminals.
There will be a click as it's connected, and the woofer should move either out or in
enough to clearly see. If not, there's an open circuit, either in both voice coils or the
crossovers. Odd that it's in both speakers, and makes it more likely the woofers are blown.

Last edited by rayma; 1st July 2017 at 10:49 PM.
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Old 2nd July 2017, 08:14 AM   #4
giralfino is offline giralfino  Italy
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OP said only the woofers aren't working. You need to understand if it is something in the crossover (bad contact or something else) or a blown driver. To check that you have to connect the woofer directly to the amp, meaning that you need to get the woofer out of the box and connect it straight to the amp. Then if it makes sound the crossover is bad, if it doesn't the woofer is bad.

Ralf
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Old 2nd July 2017, 10:00 AM   #5
anji12305 is offline anji12305  United States
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Quote:
Originally Posted by abubba View Post
Just inherited two beautiful Sansui SP-200 speakers. I don't know when they were played last. Are these speakers worth the trouble or should I just thrash them? They just look to good to be bad.
These are charming speakers that are complicated. If this is your first restoration attempt, caution is in order.

The wiring may be brittle from age.

As others have indicated, you'll need to isolate the woofers from the other components for testing - that implies removal from the box.

https://youtu.be/jUtaPR7xVCg

Last edited by anji12305; 2nd July 2017 at 10:02 AM.
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Old 2nd July 2017, 04:30 PM   #6
system7 is offline system7  United Kingdom
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Kabuki Speakers!

Love 'em!

You just connect a 1.5V battery across the unsoldered woofers, and hope for some crackle.
Attached Images
File Type: jpg Sansui SP-200.JPG (33.0 KB, 34 views)
File Type: jpg Sansui SP-200 Crossover.JPG (70.8 KB, 23 views)
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Old 2nd July 2017, 04:32 PM   #7
picowallspeaker is offline picowallspeaker  Italy
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A year before I joined DIYaudio international, I had a pair of Kenwood KL-777
(two in a row) tweeters & midrange blown on one box.
I still have a pair of them, a 16 Ω midrange and a 16 Ω tweeter. The 15"s are OK.
The boxes, however, are dismantled.
Now, you would not want dual midranges and dual tweeters.
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Old 2nd July 2017, 04:46 PM   #8
system7 is offline system7  United Kingdom
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Who knows? Dual mids in Joachim Gerhard's Quintessentially German loudspeaker....

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The Quintessentially German Loudspeaker of the 70th. Modern Interpretation.

He's no mug.
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Old 2nd July 2017, 04:48 PM   #9
picowallspeaker is offline picowallspeaker  Italy
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Those are cheap drivers, each handling half of the power.
Nowadays....
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Old 2nd July 2017, 04:50 PM   #10
system7 is offline system7  United Kingdom
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Quote:
Originally Posted by picowallspeaker View Post
Those are cheap drivers, each handling half of the power.
Nowadays....
NO. A quarter of the power. That's what is good about dual drivers.
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