SenorPwnador Posted April 1 Share Posted April 1 Just got a pair of 85(?) La Scala Pros that have been sitting in a shed forever. Woofer works fine on one, but no sound from mid or tweeter. Woofer and mid fine on the other but no tweeter. The backs are sealed on these so I removed the screws and opened them up to take a peek at the crossovers - everything is amazingly clean, although the capacitors seem rusty. What’s the best process for me to follow to identify what’s wrong with these. Not afraid to learn new tools and such, but am a novice to these things. One photo of crossover attached here. Quote Link to comment Share on other sites More sharing options...
babadono Posted April 1 Share Posted April 1 Got a meter? If so disconnect the wires at the crossover that go to the speakers..woofer, squawker and tweeter. The tweeters should read close to 8 ohms. The squawkers 16 ohms and the woofers 4 ohms. Although it sounds like you say the woofers are good. Pretty normal for the capacitor cans to get rusty as well as the outer frames of the inductors. Does not necessarily mean they are bad. 1 Quote Link to comment Share on other sites More sharing options...
wuzzzer Posted April 1 Share Posted April 1 First thing I've always done with older Klipsch with networks like that is loosen then tighten every screw on the network board. This will remove years of oxidation and give a much better signal path to all the components. Try that first and see if anything changes. 4 Quote Link to comment Share on other sites More sharing options...
babadono Posted April 1 Share Posted April 1 Yes of course...very good idea to loosen and re tighten the screws at terminal board to remove (or break through) any oxidation. I always assume people automatically do that. But I'm an electronic tech. Quote Link to comment Share on other sites More sharing options...
SenorPwnador Posted April 1 Author Share Posted April 1 Is it worth cleaning those connections while I'm in there? Deoxit or something similar? Quote Link to comment Share on other sites More sharing options...
billybob Posted April 1 Share Posted April 1 1 hour ago, SenorPwnador said: Is it worth cleaning those connections while I'm in there? Deoxit or something similar? Yes... 1 Quote Link to comment Share on other sites More sharing options...
JMeader Posted April 1 Share Posted April 1 Also tight all the screws on all the drivers they can get loose Quote Link to comment Share on other sites More sharing options...
SenorPwnador Posted April 2 Author Share Posted April 2 Quick question, does this include the screws that mount the network to the body of the speaker? Those Philips head screws in the photos? those seem to be the only ones that have corrosion. all the screws holding the wires down (flat head screws) are super clean, like they just came out of the factory - I unscrewed and tightened all of those, but no change. Next up, multi-meter testing. Quote Link to comment Share on other sites More sharing options...
nickyboy6100 Posted April 2 Share Posted April 2 25 minutes ago, SenorPwnador said: Quick question, does this include the screws that mount the network to the body of the speaker? Those Philips head screws in the photos? those seem to be the only ones that have corrosion. all the screws holding the wires down (flat head screws) are super clean, like they just came out of the factory - I unscrewed and tightened all of those, but no change. Next up, multi-meter testing. Shouldn’t have to worry about the screws that hold the x-over to the cabinet. You can swap components from speaker to speaker to troubleshoot. Quote Link to comment Share on other sites More sharing options...
SenorPwnador Posted April 5 Author Share Posted April 5 Ok, swapped non working squawker to the working squawker side and it isn’t firing. Tested with a multimeter and the numbers are all over the chart, nothing steady. So I’m guessing this K-55-M is shot? Anything else I can do with it with little technical knowledge? Or should this go off to repair or should I just buy a replacement? tweeters are next. Quote Link to comment Share on other sites More sharing options...
SenorPwnador Posted April 5 Author Share Posted April 5 Ok, tweeters are all over the map too. So all told I guess one bad k-55 and two bad k-77. Reputable place to buy replacements? It seems like k-77m is the way to go for the tweeters? Quote Link to comment Share on other sites More sharing options...
nickyboy6100 Posted April 6 Share Posted April 6 1 hour ago, SenorPwnador said: Ok, tweeters are all over the map too. So all told I guess one bad k-55 and two bad k-77. Reputable place to buy replacements? It seems like k-77m is the way to go for the tweeters? You can find K-55m’s and k-77’s fairly easy on eBay or maybe a member here has an extra set. Post a wanted add in the garage sale section. I would recommend buying from a Klipsch member first. 2 Quote Link to comment Share on other sites More sharing options...
billybob Posted April 6 Share Posted April 6 Guess they told you about replacing diaphragms in those drivers? @Fotog by 1 Quote Link to comment Share on other sites More sharing options...
SenorPwnador Posted April 16 Author Share Posted April 16 On 4/5/2024 at 9:00 PM, billybob said: Guess they told you about replacing diaphragms in those drivers? @Fotog by Yeah I did enough digging to figure out that’s an option. Ordering replacement kits from Crites. Not positive if these fit the square back tweeters though (https://critesspeakers.com/products/k77-diaphragm-kit) I think so? We’ll see, I emailed them to find out. 1 Quote Link to comment Share on other sites More sharing options...
SenorPwnador Posted April 16 Author Share Posted April 16 Does anyone have a recommendation for paint for the squawker horns on these? Gotta replace the squawkers so I may as well remove the horns and paint them (they are peeling and need it pretty badly). Quote Link to comment Share on other sites More sharing options...
Dave MacKay Posted April 17 Share Posted April 17 3 hours ago, SenorPwnador said: Does anyone have a recommendation for paint for the squawker horns on these? Gotta replace the squawkers so I may as well remove the horns and paint them (they are peeling and need it pretty badly). I used Rustoleum Painter's Touch 2X Paint & Primer spray paint. I found the satin "canyon black" colour to be just right. 2 Quote Link to comment Share on other sites More sharing options...
SenorPwnador Posted April 19 Author Share Posted April 19 Ok tweeter diaphragms replaced with a Crites kit! Sounding good! Now I need to replace one K-55m, the question is do I get a pair of Crites kits, or do I hunt down a single working K-55m? Is it bad practice to get them individually like that? Like a chance of some imbalance? Quote Link to comment Share on other sites More sharing options...
nickyboy6100 Posted April 19 Share Posted April 19 As long as it’s a good working K-55m you wouldn’t tell a difference. 3 Quote Link to comment Share on other sites More sharing options...
SenorPwnador Posted Friday at 02:32 AM Author Share Posted Friday at 02:32 AM Final update for a while. Found a k-55m on eBay for $165 and the guy took my offer of $125. Installed it today (although I need to solder some new contacts in it at some point), and both speakers are sounding amazing. Cosmetic updates are next, but I’m traveling for a bit so it’ll have to wait. Thanks for all the help getting these beasts up and running! 1 Quote Link to comment Share on other sites More sharing options...
babadono Posted Friday at 03:51 AM Share Posted Friday at 03:51 AM Excellent job, you are really going at it full speed. @SenorPwnador Almost 40 year old speakers and you're up and running in less than a month. Cannot get over how clean those crossovers look. Are you going to post more pics of how the cabinets look? We love pictures. Quote Link to comment Share on other sites More sharing options...
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