Pstores Posted January 24, 2022 Share Posted January 24, 2022 Anyone have information on these. The drivers are K77m, k55v, and k33e. But has this tweeter protector within the Xover. Any info I’d appreciated. Quote Link to comment Share on other sites More sharing options...
OO1 Posted January 24, 2022 Share Posted January 24, 2022 31 minutes ago, Pstores said: Anyone have information on these. The drivers are K77m, k55v, and k33e. But has this tweeter protector within the Xover. Any info I’d appreciated. https://products.electrovoice.com/binary/STR Service.pdf Quote Link to comment Share on other sites More sharing options...
captainbeefheart Posted January 24, 2022 Share Posted January 24, 2022 I wonder if anyone has measured more distortion with these in the circuit. The non-linear load of the rectifier may introduce unwanted harmonics into the signal. Quote Link to comment Share on other sites More sharing options...
tigerwoodKhorns Posted January 24, 2022 Share Posted January 24, 2022 7 minutes ago, captainbeefheart said: I wonder if anyone has measured more distortion with these in the circuit. The non-linear load of the rectifier may introduce unwanted harmonics into the signal. What about wiring in a filament type bulb. Harder to get nowadays but what do you recommend? Adds a little resistance I think. Quote Link to comment Share on other sites More sharing options...
Pstores Posted January 24, 2022 Author Share Posted January 24, 2022 I’ve read what they are and seen the manuals on them. My question I guess is more of is this a stock part in this crossover. I haven’t seen any of the Klipsch crossovers with them in them. Sent from my iPhone using Tapatalk Quote Link to comment Share on other sites More sharing options...
captainbeefheart Posted January 24, 2022 Share Posted January 24, 2022 52 minutes ago, tigerwoodKhorns said: What about wiring in a filament type bulb. Harder to get nowadays but what do you recommend? Adds a little resistance I think. It will increase resistance with increased current. A PTC Thermistor is much better, it will have a much sharper knee at a specific current you choose, at this current and where you pass the knee increases resistance very quickly to a very high level. The light bulb will have much more gradual transfer between current and resistance and not offer as good protection. 1 Quote Link to comment Share on other sites More sharing options...
captainbeefheart Posted January 24, 2022 Share Posted January 24, 2022 44 minutes ago, Pstores said: I’ve read what they are and seen the manuals on them. My question I guess is more of is this a stock part in this crossover. I haven’t seen any of the Klipsch crossovers with them in them. Sent from my iPhone using Tapatalk No not a stock part 1 Quote Link to comment Share on other sites More sharing options...
OO1 Posted January 24, 2022 Share Posted January 24, 2022 4 hours ago, Pstores said: is this a stock part in this crossover. NO for the klipsch crossover , but YES , for the EV STR and the K77 since both components were Made by Electrovoice to compliment each other . Quote Link to comment Share on other sites More sharing options...
Pstores Posted January 24, 2022 Author Share Posted January 24, 2022 Thanks for the information. I thought that was the case. Wanted to verify. Thanks again Quote Link to comment Share on other sites More sharing options...
tigerwoodKhorns Posted January 24, 2022 Share Posted January 24, 2022 15 hours ago, captainbeefheart said: It will increase resistance with increased current. A PTC Thermistor is much better, it will have a much sharper knee at a specific current you choose, at this current and where you pass the knee increases resistance very quickly to a very high level. The light bulb will have much more gradual transfer between current and resistance and not offer as good protection. Do you put it in series with the tweeter in the negative line to the tweeter? How do you size these? Quote Link to comment Share on other sites More sharing options...
captainbeefheart Posted January 24, 2022 Share Posted January 24, 2022 19 minutes ago, tigerwoodKhorns said: Do you put it in series with the tweeter in the negative line to the tweeter? How do you size these? Yes they go in series with the tweeter, shouldn't matter + or - leg As for size, If memory serves correctly I don't think the K77 want anything over 2-2.5 watts maximum power, we'll say at 6 ohms, that's 645mA for 2.5 watts. So you look for a PTC that has a It (current trip) of 600mA. This littlefuse brand says Tt (trip time) of 2 seconds. So if current reaches 600mA or higher for longer than 2 seconds it will raise from a resistance of .8 ohms to 4 ohms, once current is reduced it will reset back to Rmin (resistance minimum) of .8 ohms. At $.82 they are cheap insurance for K77 protection. https://www.digikey.com/en/products/detail/littelfuse-inc/TRF250-180-2/1114120 Quote Link to comment Share on other sites More sharing options...
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