radiogram Posted July 16, 2022 Share Posted July 16, 2022 Having recently figured out the resistor values in mid and tweeter section for H III Xover, now I am going to convert my CW III Xover to H III Xover by substituting the resistors. These resistors are all spec'ed at 25 Watts. Where I live I can only get 10 Watt Daytons. So only option is to buy two 10 watts resistors of half value and use them in series (to get up to 20 watts) which I rather not do as physical layout will not be a simple swap of resistors. Do I really need 25 Watts resistors for mid and highs? Can I get away with 10 Watts? Thanks Quote Link to comment Share on other sites More sharing options...
Deang Posted July 16, 2022 Share Posted July 16, 2022 The two networks are identical except for the resistor values? 10 watts will work but I wouldn’t do sustained high volumes. Quote Link to comment Share on other sites More sharing options...
radiogram Posted July 16, 2022 Author Share Posted July 16, 2022 @CrankysoldermeisterYes as far as the mid and High Section the Crossover is same except for Resistor values used for padding. Most of my listening is low to medium volumes. Thanks Quote Link to comment Share on other sites More sharing options...
Deang Posted July 16, 2022 Share Posted July 16, 2022 You’ll be okay then. Quote Link to comment Share on other sites More sharing options...
JohnA Posted July 17, 2022 Share Posted July 17, 2022 You can parallel resistors to raise the wattage limit. The resistance will have to be higher to use them in parallel. 1 Quote Link to comment Share on other sites More sharing options...
OO1 Posted July 17, 2022 Share Posted July 17, 2022 On 7/16/2022 at 6:11 AM, radiogram said: Where I live I can only get 10 Watt Daytons there are plenty of 25 watts resistors on Ebay Quote Link to comment Share on other sites More sharing options...
mustang_flht Posted July 18, 2022 Share Posted July 18, 2022 Hi @radiogramme @JohnA's comment is a good thing For me the 10W resistors are already well sized, but if you want to increase the reliability of the resistors, I advise you to mount them with a space of 1/2 inch between the printed circuit and the body of the resistor: the cooling by convection will be much better and the reliability greatly increased. NO YES Otherwise you can't find 25w Mundorf resistors on the net? https://www.mundorf.com/audio/en/shop/Resistors/?reload_filter=true&p (max)_25watt=true&p (max)_1x15watt=false&p (max)_2x7%2C5watt=false&p (max)_5watt=false&p (max)_10watt=false&p (max)_20watt=false&p (max)_30%2F3watt=false Quote Link to comment Share on other sites More sharing options...
radiogram Posted July 18, 2022 Author Share Posted July 18, 2022 @mustang_flht Thanks for the cooling tip. I am India and have no access to 25 Watt resistors of decent quality easily. For now I am going to experiment with 10 Watt resistors and once I am satisfied I will probably get them from mouser/madisound etc when my sister comes here next month. BTW, I am now using Bi-Amping to make up for sensitivity difference between bass and mid-highs with the Integrated Amp driving the bass is boosted up. In this I actually find that I prefer the mid-highs 4db lower instead of 3db. I am also curious that a much less sensitive speaker (only 85 db) like JBL A130 I have, uses 1only 10 watt resistor when I would expect much more power going into this than the Heresy. Thanks Quote Link to comment Share on other sites More sharing options...
mustang_flht Posted July 18, 2022 Share Posted July 18, 2022 @radiogramme Ok it's noted, you are in India 😍 and no 25W resistors. I have 10W resistors on my CWIII in the sqwaker between 800Hz and 5000Hz without any problem for 2 years: they are far from the board for better cooling, as I explained to you above 😉 My R18ohms 10w green in middle on home network Quote Link to comment Share on other sites More sharing options...
radiogram Posted July 18, 2022 Author Share Posted July 18, 2022 @mustang_flhtMan those are some nice parts! Is this a custom modified network (not stock CW III)? Because I see only two inductors instead of 3 and only 1 resistor instead of 2 and I also see more caps. Quote Link to comment Share on other sites More sharing options...
radiogram Posted July 18, 2022 Author Share Posted July 18, 2022 @mustang_flhtI recognize Audyn and Jantzen. What make are the inductors, blue caps and resistor (Mills?) Quote Link to comment Share on other sites More sharing options...
mustang_flht Posted July 18, 2022 Share Posted July 18, 2022 @radiogram No 3 Coils : Jantzen and Klipsch from the CWIII and Yes is modification, but just for the Faital pro HF103 and B&C DE120, not for original Klipsch K53Ti and K107Ti for détails look here , schema of my network is on page 2 and post of March 21, 2021 Quote Link to comment Share on other sites More sharing options...
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