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Old 19th May 2014, 01:53 PM   #1
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Default Anyone who has "Yamaha" speaker please come here.

Hi,

I've noticed something weird on the Japanese 1980s Yamaha speaker. Usually, any speaker drivers would have their "positive" terminal on the right and "negative" terminal on the left of their voice coil when placing them faced with the magnet (You can see on your drivers). But from my observation, those 80s Yamaha speaker; ns-10/m, ns-20, ns-100/m, etc. and also 80s JBL speaker, were placed their voice coil terminal in opposite to the usual drivers. (See attached image and compare to your own speaker)

For JBL, I don't doubt at all because there has been announced from JBL that their speakers are Negative-type. You can find out on this link http://www.jblpro.com/pub/technote/tn_v1n12b.pdf or you can type"jbl reversed polarity speaker"in google for more information.

So, I want a hand from one who has those vintage yamaha to examine the polarity by using a 1.5V battery connecting to + (red) terminal. If they are really be a negative-type, the cone should move "in" when connecting to + of battery while the usual speaker should move "out". IMHO

Thank you

Attached image :
image 1 : ns-10m woofer
image 2 : ns-10 woofer
image 3 : ns-20m tweeter
image 4 : ns-20m woofer
image 5 : ns-10mx drivers
image 6 : ns-1000m woofer
Attached Images
File Type: jpg NS10M-TU02.jpg (18.3 KB, 204 views)
File Type: gif Yamaha_ns10woofer_g.gif (68.0 KB, 204 views)
File Type: jpg NS-20M-08.jpg (19.1 KB, 202 views)
File Type: jpg NS-20M-06.jpg (21.0 KB, 202 views)
File Type: jpg a3m7-125-Y_NS10MX-01.jpg (103.1 KB, 201 views)
File Type: jpg y1000m.jpg (60.9 KB, 41 views)

Last edited by presscot; 19th May 2014 at 02:07 PM.
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Old 19th May 2014, 02:27 PM   #2
system7 is online now system7  United Kingdom
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presscot, you risk driving yourself crazy with this obsession!

There is NO CONVENTION on left or right with speaker terminals. That's why manufacturers use a red dot or a fatter spade terminal to denote positive, which by convention causes the speaker to move forward when connected to a 1.5V battery positive terminal.

But don't try that with a ribbon tweeter, you might blow it.
Attached Images
File Type: jpg Visaton W200S.JPG (31.4 KB, 45 views)
File Type: jpg Visaton G20SC.JPG (32.2 KB, 30 views)
File Type: jpg Morel CAT 298.JPG (18.1 KB, 30 views)
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Old 19th May 2014, 03:15 PM   #3
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System7,

No. Can't you see in your attached pictures , your Visaton drivers are + sign, and red spot or fatter spade, on right-terminal while looking in my attached pictures, the Yamaha's are on the left.
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Old 19th May 2014, 03:22 PM   #4
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presscot, the Morel tweeter on Steve's 3rd pic is on the left, if the magnet were facing you.
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Old 20th May 2014, 12:50 AM   #5
CLS is offline CLS  Taiwan
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Click the image to open in full size.

I remember I've checked the polarity before wiring and they should act normal (+ to + for pushing out / retreating for the other ).

I'll check it again.
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Old 20th May 2014, 01:30 AM   #6
chrisb is offline chrisb  Canada
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Battery test to detect forward motion is certainly easy enough for larger cones, but domes and small cone tweeters with fraction of mm x-max could be rather more tricky?
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Old 20th May 2014, 02:02 AM   #7
DUG is offline DUG  Canada
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Equipment:

Battery
Capacitor
Microphone
Oscilloscope

Method:

Test pulse polarity response of mic and scope with known woofer.

Charge cap with battery and discharge into tweeter.

Observe pulse response on scope.

Simple.

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Old 20th May 2014, 03:35 AM   #8
CLS is offline CLS  Taiwan
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Quote:
Originally Posted by chrisb View Post
Battery test to detect forward motion is certainly easy enough for larger cones, but domes and small cone tweeters with fraction of mm x-max could be rather more tricky?
In my experience, the motion of dome tweeter is still visible in battery test.

Only a little, yes, but visible.

Not sure for compression drivers.
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Old 20th May 2014, 03:41 PM   #9
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Besides classic JBL and Tannoy were there any other manufacturers who designed drivers so the cone moves back when faced with a positive voltage?

Just being curious...
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Old 21st May 2014, 01:57 AM   #10
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Quote:
Originally Posted by Charles Darwin View Post
Besides classic JBL and Tannoy were there any other manufacturers who designed drivers so the cone moves back when faced with a positive voltage?

Just being curious...
Aha, I do doubt too.
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