Mikerodrig27 Posted March 21, 2021 Share Posted March 21, 2021 I want to build a Alk Universal network for my Lascala speakers. Al said that there was a universal schematic floating around on here that I can use. I wanted to see if this is the one that I should follow. I went through a ton of threads looking for it. What I have attached is what I believe is the first rendition of the network. I have all of the parts in the cart and wanted to check with you guys before I pull the trigger and purchase all of the parts. I may try the AA and A down the road but am intrigued by the universal. Quote Link to comment Share on other sites More sharing options...
mboxler Posted March 21, 2021 Share Posted March 21, 2021 Yes, that is the same as the kit I built many years ago. I have, in the mean time, made a couple changes... Replaced the 1.3mH inductor with a 2.5mH for the woofer. Replaced the .2mH inductor with a .15mH for the tweeter. The 2.5mH inductor seemed to tighten the bass. The tweeter inductor swap seemed to smooth out the the top end a little. Mike 1 1 Quote Link to comment Share on other sites More sharing options...
Mikerodrig27 Posted March 21, 2021 Author Share Posted March 21, 2021 Hey Mike, Thanks! I may just grab both values of inductors and see how they sound. I vaguely remember reading that the 1.3 included counting the inductance of the woofer and the 2.5 does not. I am excited to build these. What did you do for the 7.5mH cap? I am currently going to use Solen for that Clarity Cap CSA for the rest of the caps. Solen is the only one I can find in the 7.5mH value. Thanks, Mike Quote Link to comment Share on other sites More sharing options...
mboxler Posted March 21, 2021 Share Posted March 21, 2021 7 minutes ago, Mikerodrig27 said: Hey Mike, Thanks! I may just grab both values of inductors and see how they sound. I vaguely remember reading that the 1.3 included counting the inductance of the woofer and the 2.5 does not. I am excited to build these. What did you do for the 7.5mH cap? I am currently going to use Solen for that Clarity Cap CSA for the rest of the caps. Solen is the only one I can find in the 7.5mH value. Thanks, Mike Actually the Clarity Cap CSA 6.8uf will be a better choice.. I got the Solen 7.5uf now. 1 Quote Link to comment Share on other sites More sharing options...
Mikerodrig27 Posted March 21, 2021 Author Share Posted March 21, 2021 Okay cool. I actually have two of the Clarity cap PX 6.8uf in my parts box that I can use. Why is the 6.8uf a better choice just out of curiosity? Trying to learn some things. Quote Link to comment Share on other sites More sharing options...
mboxler Posted March 21, 2021 Share Posted March 21, 2021 8 hours ago, Mikerodrig27 said: Okay cool. I actually have two of the Clarity cap PX 6.8uf in my parts box that I can use. Why is the 6.8uf a better choice just out of curiosity? Trying to learn some things. Better may have been a poor choice of word. In a true 3rd order Butterworth high pass filter, the second capacitor is 3 times larger than the first. 6.8uf is close enough. The 7.5uf would have been fine also, but I assumed you wanted to stay with CSA's. Looking on Al's website, in the Super AA-X section, you'll see how he converts AA to something close to the Universal. Can't make out the second cap value, but I believe it's 6.8uf. Notice also that he doesn't replace the 2.5mH woofer inductor as a part of the conversion. Also, schematic doesn't show the 1.5 amp fast blow fuse. I had it in initially but removed it when I swapped out the woofer inductor. Have fun with your project! What squawker/tweeter are you using? I also made a couple of other tweaks that you may want to try later, but they can be added to the finished crossover easily. Mike 2 Quote Link to comment Share on other sites More sharing options...
Mikerodrig27 Posted March 21, 2021 Author Share Posted March 21, 2021 Perfect. I will switch to the 6.8uF caps. I am going to use the stock tweeter and squawker for now. I may change them out down the road. I just need to get away from the original AL network for now. The speakers have some pretty significant veneer damage. They are the industrials with the plywood construction which I like the look of but I won't be able restore them to original. I was thinking of veneering them with mahogany or walnut. I was also thinking of adding 1/4" or 1/2" plywood to the sides to make them thicker. I don't like the look of the little braces that people put into the horn even though I understand that they are effective. What is your take on adding bracing to the sides? I also noticed the top pane of wood where the mid and tweeter are could use some sort of bracing as well. I also saw something about someone adding polyfill to the sealed doghouse where the woofer is. Does this seem like a good idea? Quote Link to comment Share on other sites More sharing options...
tigerwoodKhorns Posted March 21, 2021 Share Posted March 21, 2021 @Mikerodrig27 I just posted it a few days ago, schematic and parts list. Your schematic is different. The original unaltered schematic is in the link below. Quote Link to comment Share on other sites More sharing options...
Mikerodrig27 Posted March 21, 2021 Author Share Posted March 21, 2021 (edited) Thanks. I saved the info. I got a copy of the universal crossover, parts text layout etc. thanks to another member here. I noticed that it different than the one you posted. Is the one you posted an updated version? PARTS.TXT Edited March 21, 2021 by Mikerodrig27 Quote Link to comment Share on other sites More sharing options...
OO1 Posted March 21, 2021 Share Posted March 21, 2021 17 hours ago, Mikerodrig27 said: I want to build a Alk Universal network for my Lascala speakers. I would rather build an AA - Quote Link to comment Share on other sites More sharing options...
Mikerodrig27 Posted March 21, 2021 Author Share Posted March 21, 2021 Yes, I went back and forth with that for a while. I may build the AA down the road just to experiment as the parts cost on it isn't too high. Once I have the Model 3636 autotransformer, I should be able to swap it to different boards. Quote Link to comment Share on other sites More sharing options...
OO1 Posted March 21, 2021 Share Posted March 21, 2021 that's the idea , keep it simple , and reliable , klipsch style , the AA or A are classic , purist designs - Quote Link to comment Share on other sites More sharing options...
Mikerodrig27 Posted March 21, 2021 Author Share Posted March 21, 2021 What I meant was that I am going to build the ALK universal and then try the AA down the road. Quote Link to comment Share on other sites More sharing options...
Budman Posted March 21, 2021 Share Posted March 21, 2021 Deang built these ALK Universal design for my Cornwalls and the bottom picture for my Klipschorns which i sold and bought 2 new sets of his AA's 1 Quote Link to comment Share on other sites More sharing options...
Mikerodrig27 Posted March 21, 2021 Author Share Posted March 21, 2021 Those look really nice. I heard he does a great job. Quote Link to comment Share on other sites More sharing options...
Budman Posted March 21, 2021 Share Posted March 21, 2021 a work of Art i got 2 more sets for my 69 and 78 klipschorns 1 Quote Link to comment Share on other sites More sharing options...
sootshe Posted March 21, 2021 Share Posted March 21, 2021 This should be everything you will need. My Uni's have Jantzen Alumen Z Caps & Superior Z's (all have Dueland ByPass caps) with Mundorf VL236 Coils/Solen Litz. You won't go wrong with the Uni....with the right components it's great for smooth, easy listening. Very clear, open sound. 3636 ATTENUATION LIST.pdf 3 Quote Link to comment Share on other sites More sharing options...
Wirrunna Posted March 21, 2021 Share Posted March 21, 2021 Here are two more threads about ALK Universal crossovers, this one which includes changes to crossover at 4500Hz if you are using an upgraded tweeter . and this one shows how to utilise an AK3 woofer section with the Universal 1 Quote Link to comment Share on other sites More sharing options...
tigerwoodKhorns Posted March 22, 2021 Share Posted March 22, 2021 6 hours ago, Mikerodrig27 said: Thanks. I saved the info. I got a copy of the universal crossover, parts text layout etc. thanks to another member here. I noticed that it different than the one you posted. Is the one you posted an updated version? PARTS.TXT 1.91 kB · 0 downloads The schematic that I posted is from about 2005 or so. Quote Link to comment Share on other sites More sharing options...
Mikerodrig27 Posted March 22, 2021 Author Share Posted March 22, 2021 Awesome! Thanks! There is a ton of great info on this forum. Okay, so what I am gathering is that the version that I posted sends ~1000hz and below to the woofer and roughly 410hz and up to the mid/tweet. The other version that I see posted puts everything ~500hz and below to the woofer ~500hz and up to the mid/tweet. Let me know if this sounds right. In other words, there should be less mingling between the woofer and the squawker with the 2005 version that I see posted. sootshe, good job on your build! Looks like a lot of nice boutique parts. Is the point of the bypass cap to save a little money by not having to purchase a 40uf expensive cap vs a 39uf less expensive cap? Quote Link to comment Share on other sites More sharing options...
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