Schu Posted February 12, 2014 Author Share Posted February 12, 2014 (edited) Wow those look awesome... This hobby is so fun but costly. you know, the way I look at it these type investments are not consumables, so I take the plunge one time and I'm good to go for the life of the product. if the hobby required constant investment in order to maintain a level of performance, I would probably find another hobby. the only downside to this purchase, if I can find a downside at all, is that now I can no longer own a pair of Klipsch speakers without knowing that I have to make this additional modification. Edited February 12, 2014 by Schu Quote Link to comment Share on other sites More sharing options...
jacksonbart Posted February 12, 2014 Share Posted February 12, 2014 They are good looking Quote Link to comment Share on other sites More sharing options...
mike stehr Posted February 13, 2014 Share Posted February 13, 2014 (edited) Great pictures, they show all of my screw ups. You have the same part I used, you're good to go. Just connect one end of the coil to tap 3 and the other end to squawker positive. There is no reversal in polarity. .17 is correct, so it adds a little less than 1/4 ohm of resistance in series with the horn. The inductance value is what you get when you calculate for a 6kHz crossover point using 15 ohms, the impedance of the driver at the crossover point. This number may actually be closer to 13 ohms, but with a first order filter, the difference is insignificant. The electrical first order combines with the acoustical 3rd order natural/mass rolloff to increase the steepness of the slope -- which is actually a form of attenuation, since the driver is receiving less energy. So, the coil dials things down a bit, and you don't have to worry about changing caps values. Speaking of cap values, the primary cap is a 3.3uF, which measured 3.22, both caps were matched to within 2%. The B2 uses a 3uF. If I can stay within less than 10% on a first order crossover, well, I'm not going to get to wound up over that. Early networks like the K1000/5000 and K500/5000 used a coil in series with the horn, which PK later removed -- apparently no longer feeling the need for them with the new horn and driver. However, I've been doing this mod for a long time, and everyone likes it quite a bit. It takes some of the bite out of the midrange without requiring the move to something like a Universal. This also leaves more money left over for some capacitors that really smooth and open things up. Ok, I went ahead and did this. My Cornwall network was pretty much stock B2, except I was using a 3uf Sonicap for the input cap, and a Jantzen standard 1uF in parallel with a 1uF Jantzen Silver Z-cap for the tweeter. I'm using a 22uF Jantzen standard for the woofer that I'ved used all along. I listen near-field, and the Sonicap used with the midrange has always been a little objectionable.( spitty/harsh) The networks have been this way for a couple years. Even with tube amplifiers, the midrange has the same slight attribute. These are '83 Cornwalls, with the K51V, and Crites CT125 tweeters. I've been broke lately, so I can't buy any nice 3uF capacitors. So I found the original Aerovox 3uF oil capacitors, and measured them with a cheap but decent enough LCR meter. 2.92uF for one, 2.93uF for the other, close enough...Don't know the ESR #s, however... I scrounged up a couple Cornell-Dublier 600 volt 2uF oil caps that measure 1.8-1.9uF. Used these for the tweeters. I'll have to listen to things for awhile, but with the first take I was using a CD player and a Scott LK48B integrated amp. For near-field, the midrange is a lot more relaxed than it was before, I can live with that. The tweeters may be a little too laid back using those Cornell-Dublier 2uF capacitors, there seems to be some "sparkle" lost...I'll have to listen for a little longer to really determine that. I may go ahead and put back the Silver Z-cap, and Jantzen 1uF cap back in the networks for the tweeters. Maybe I should have tried the mod without the cap changes...oh well... I've pondered using the Russian Military capacitors for the 3uF input cap, but 3uF seems to be a odd value with respect to those caps. I do like how the midrange sounds now, however. Mike Edited February 13, 2014 by mike stehr Quote Link to comment Share on other sites More sharing options...
Deang Posted February 14, 2014 Share Posted February 14, 2014 Shoot me an email with your address, I will send you some caps. Quote Link to comment Share on other sites More sharing options...
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