SDA tweeter LS2000's most common point of failure?
treppenwitz
Posts: 2
Hi folks. It's my first time on this forum.
I have a pair of SDA CRS speakers (1986 or 87) that I bought used about 25 years ago. The right tweeter died around 2003 and I replaced it with an RD0194. I guess I lucked out that it was actually the tweeter that went bad, since I didn't troubleshoot any further before replacing it. The replacement succeeded.
Now nearly 20 years later, the left tweeter has gone out. There's a lot more information available online now, and it looks like the actual problem could be one of several things: The polyswitch, the tweeter coil, a capacitor, (or...? something else in the crossover circuit?).
I almost never crank these speakers, so I would be surprised if anything overheated or if it were drawing excessive current. I looked at the electrolytic caps and other components, and they visually appear fine.
Before I track down another RD0194, are there any downsides in shorting out the polyfuse? Is it just a matter of soldering a wire across it? or maybe snipping it out and soldering the leads together?
How common is it for a tweeter to just give up the ghost like that?
I have a pair of SDA CRS speakers (1986 or 87) that I bought used about 25 years ago. The right tweeter died around 2003 and I replaced it with an RD0194. I guess I lucked out that it was actually the tweeter that went bad, since I didn't troubleshoot any further before replacing it. The replacement succeeded.
Now nearly 20 years later, the left tweeter has gone out. There's a lot more information available online now, and it looks like the actual problem could be one of several things: The polyswitch, the tweeter coil, a capacitor, (or...? something else in the crossover circuit?).
I almost never crank these speakers, so I would be surprised if anything overheated or if it were drawing excessive current. I looked at the electrolytic caps and other components, and they visually appear fine.
Before I track down another RD0194, are there any downsides in shorting out the polyfuse? Is it just a matter of soldering a wire across it? or maybe snipping it out and soldering the leads together?
How common is it for a tweeter to just give up the ghost like that?
Comments
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You should have bought two RD-014 tweeters the first time around. Personally I don't understand how you lived with that imbalance for so long.
Now to be clear do your CRS have one tweeter or two per speaker?
You can definitely jump the switch with no issues other than the tweeter will play louder. Most of us remove the poly switch and replace with a half ohm 10 or 12 watt resistor to compensate for the poly switch resistance. -
Thanks for the quick reply. Yeah, if the info were as easy to get online in 1998 as it is today, I probably would have replaced the pair. I didn't know at the time that the replacement tweeter was different than the original in the other channel. And Polk didn't suggest it on the phone at the time when I bought the part, either.
The CRS has one tweeter in each speaker. Do you replace the polyswitch so that it is no longer a failure point, or is there another reason? -
Correct the polyswitches are nasty. Once they trip they will start tripping easier and easier as time goes on. That is the reason we replace them with a Vashay-Mills 1/2 ohm 10 or 12 watt resistor. They resistance of the polyswitch is a 1/2 ohm, so the 1/2 ohm resistor will make the circuit sound the same. If you just jump the polyswitch with a piece of wire the tweeter will play louder and be more forward sounding.
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That it was made.SDA tweeter LS2000's most common point of failure?Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk
