Sound Dynamics 100S wiring

farmerjack61 · 2nd March 2011, 02:19 AM

Hello all. I hope someone has an old set of Sound Dynamics 100S speakers. They are the ones that handle 60Wrms, have a 4 ohm 10" woofer and a spun aluminium cone on a phenolic tweeter, which is about 6 ohms from memory.

I have recently re-boxed mine and stuffed up the x-over.

I have kept a photograph of the crossover and can replicate it, but I need to know which couloured wires go to which spade connectors on what drivers.

I already know the component values and the rest of the wiring but.

The wires coming out of the standard Sound Dynamics crossover are;
Red, Black, Blue and Yellow. But which goes to Tweet+, Which one goes to Tweet-, Which one goes to Woof+ and which one to Woof- ????

I will thank you in advance because I know it's a bit of a hassel pulling the drivers out.

Here is a picture of the original crossover that I wish to replicate;

Cheers and bye for now, Phil Elliott

AllenB · 2nd March 2011, 09:36 AM

With a closer look at the wiring, or if you could draw a schematic, it would be easy enough to guess. Tweeter polarity would need trial listening or measurement.

farmerjack61 · 2nd March 2011, 09:50 AM

Hi there Allan, I'm in Devonport Tassie. I will get back soon with a schematic, But as I say, the polarity is the issue. This is a very different crossover that worked well, and I wish I never messed around with it!
Cheers mate, Phil Elliott

AllenB · 2nd March 2011, 09:57 AM

I'm in central western NSW. It shouldn't be too hard to tell what the polarity is meant to be.

farmerjack61 · 2nd March 2011, 10:00 AM

I had a mate that worked on the Cotton up that way, in Narrabri. I will get back soon.

StigErik · 2nd March 2011, 10:08 AM

It may look like there's no filter for the woofer - its probably connected directly with the black (-) and red (+) wires. Tweeter should be blue and yellow.

farmerjack61 · 2nd March 2011, 10:12 AM

Hi there Stig, sounds feasable, I will take another look now. Greetings and salutations from Tasmania.
Bye for now, Phil Elliott

farmerjack61 · 2nd March 2011, 11:13 AM

HI stig. here's a quick draft. Can you describe the signal path or even the type of crossover? Does it look 'RIGHT' to you?

My experience is limited to simple 6db/oct filters and haven't seen this one before.

What do you reckon?

Cheers and bye for now, Phil E.

StigErik · 2nd March 2011, 11:16 AM

This looks right to me!

Woofer is connected directly without crossover, and the tweeter is using a 3rd order (18 dB/oct) filter with a series resistor to attenuate the tweeter a little bit.

AllenB · 2nd March 2011, 11:20 AM

I agree with Stig. Now try the tweeter in both polarities. If you can't pick the best one, let us know.

2nd March 2011, 10:08 AM	#6
StigErik diyAudio Member Join Date: Feb 2008	It may look like there's no filter for the woofer - its probably connected directly with the black (-) and red (+) wires. Tweeter should be blue and yellow. __________________ dipoles dipoles dipoles dipoles dipoles dipoles dipoles dipoles and dipoles

2nd March 2011, 11:16 AM	#9
StigErik diyAudio Member Join Date: Feb 2008	This looks right to me! Woofer is connected directly without crossover, and the tweeter is using a 3rd order (18 dB/oct) filter with a series resistor to attenuate the tweeter a little bit. __________________ dipoles dipoles dipoles dipoles dipoles dipoles dipoles dipoles and dipoles

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2nd March 2011, 09:36 AM	#2
AllenB diyAudio Member Join Date: Oct 2008	With a closer look at the wiring, or if you could draw a schematic, it would be easy enough to guess. Tweeter polarity would need trial listening or measurement.

2nd March 2011, 09:50 AM	#3
farmerjack61 diyAudio Member Join Date: Nov 2010 Location: Devonport, Tasmania	Hi there Allan, I'm in Devonport Tassie. I will get back soon with a schematic, But as I say, the polarity is the issue. This is a very different crossover that worked well, and I wish I never messed around with it! Cheers mate, Phil Elliott

2nd March 2011, 09:57 AM	#4
AllenB diyAudio Member Join Date: Oct 2008	I'm in central western NSW. It shouldn't be too hard to tell what the polarity is meant to be.

2nd March 2011, 10:00 AM	#5
farmerjack61 diyAudio Member Join Date: Nov 2010 Location: Devonport, Tasmania	I had a mate that worked on the Cotton up that way, in Narrabri. I will get back soon.

2nd March 2011, 10:12 AM	#7
farmerjack61 diyAudio Member Join Date: Nov 2010 Location: Devonport, Tasmania	Hi there Stig, sounds feasable, I will take another look now. Greetings and salutations from Tasmania. Bye for now, Phil Elliott

2nd March 2011, 11:20 AM	#10
AllenB diyAudio Member Join Date: Oct 2008	I agree with Stig. Now try the tweeter in both polarities. If you can't pick the best one, let us know.

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