BEC Posted September 25, 2004 Share Posted September 25, 2004 Does anyone have the schematic for the Type AL crossover? Thanks Bob Crites Quote Link to comment Share on other sites More sharing options...
Al Klappenberger Posted September 25, 2004 Share Posted September 25, 2004 Bob, Here's the AL network. The schematic is missing some details, but it's a junkey network anyhow, so who cares! Al K. Quote Link to comment Share on other sites More sharing options...
Deang Posted September 25, 2004 Share Posted September 25, 2004 LOL Quote Link to comment Share on other sites More sharing options...
BEC Posted September 25, 2004 Author Share Posted September 25, 2004 Al, Thanks for the schematic. I have a customer who is blowing tweeters using Lascalas with the AL network. From the schematic, looks like good tweeter protection. If that network is working right, I can't see how he blew the tweets. Bob Quote Link to comment Share on other sites More sharing options...
Deang Posted September 25, 2004 Share Posted September 25, 2004 Maybe someone disconnected the diodes (or maybe one or both is bad). Quote Link to comment Share on other sites More sharing options...
BEC Posted September 25, 2004 Author Share Posted September 25, 2004 Dean, Either diode being open would disable that part of the protection. But, bad on both crossovers? That is getting a bit tough to believe. Also tough to troubleshoot this one by email. Perhaps I can get him to shoot me some pictures to see if someone has "worked" on it. Bob Quote Link to comment Share on other sites More sharing options...
Deang Posted September 25, 2004 Share Posted September 25, 2004 Find out how much power he is driving them with. I'm curious if he's burning them out from clipping (not enough power), or overdriving them with too much power. Quote Link to comment Share on other sites More sharing options...
lynnm Posted September 25, 2004 Share Posted September 25, 2004 Waddahell is this ?! Xover freaks on a forum helping each other?!?! Sheesh a guy can't rely on nothing anymore! Quote Link to comment Share on other sites More sharing options...
Deang Posted September 26, 2004 Share Posted September 26, 2004 Nobody loves us, we only have each other. Quote Link to comment Share on other sites More sharing options...
djk Posted September 26, 2004 Share Posted September 26, 2004 Bob, the AL doesn't have zener diodes. I have run into this same exact problem with the AL network and it is the ground connection for the tweeter inductor (which is on the 2µF cap for the elliptical filter). With this connection open the network goes to 6dB and breaks tweeter leadout wires in no time. Before I found the problem I added the zener diodes and a lightbulb to no avail. Quote Link to comment Share on other sites More sharing options...
Deang Posted September 26, 2004 Share Posted September 26, 2004 Dennis, the setup looks almost virtually identical to the AA -- they look like diodes to me. No? What am I missing. Be nice. Quote Link to comment Share on other sites More sharing options...
Deang Posted September 26, 2004 Share Posted September 26, 2004 Hmmm. Try again. Quote Link to comment Share on other sites More sharing options...
BEC Posted September 26, 2004 Author Share Posted September 26, 2004 OK, now I am confused. I would be surprised if Dennis is wrong. I would also be surprised if ALK is wrong. Now I think we need to see a picture of an AL crossover. Bob Quote Link to comment Share on other sites More sharing options...
BEC Posted September 26, 2004 Author Share Posted September 26, 2004 Well, I compared the schematic that ALK posted to the one that I have which claims to be an AL-2 and they seem to be the same. I am thinking now that I still haven't seen a schematic of the AL and, if that is correct, would still like to see one. Bob Quote Link to comment Share on other sites More sharing options...
BEC Posted September 26, 2004 Author Share Posted September 26, 2004 Dean, The guy is using lots of power and using them as PAs. What Dennis said is really likely. I know from testing that a K-77 can stand very little power below 3 khz. I blew one with less than one watt at 2.5 khz, just took the voice coil apart and made a slinky out of it. If that is the case (lows getting through) even the zeners could not protect against that. We need to investigate the question of whether "clipped" power is somehow different from "clean" power as far as driver damage is concerned. My gut feeling is that "power is power" but you have to calculate it a bit differently because average power increases somewhat as clipping becomes extreme. Bob Crites Quote Link to comment Share on other sites More sharing options...
Deang Posted September 26, 2004 Share Posted September 26, 2004 "I compared the schematic that ALK posted to the one that I have which claims to be an AL-2 and they seem to be the same." Well, attached is the AL-2 crossover schematic I received from Klipsch. Definitely not the same as what Al posted. AL-2.pdf Quote Link to comment Share on other sites More sharing options...
Deang Posted September 26, 2004 Share Posted September 26, 2004 I don't know what Al posted, but I don't think it's an AL network. Here is a schematic of the AK network for the Klipschorn. It isn't likely that the AL network would have the diodes if the AK network doesn't -- know what I mean? AK1.pdf Quote Link to comment Share on other sites More sharing options...
Deang Posted September 26, 2004 Share Posted September 26, 2004 That thing Al posted is bizarre. It has the AL-2 tweeter section, yet shows the diodes in place as the AA. Then we have a 6uF cap feeding into a T3A autotransformer, and a LCR circuit in parallel with the midrange. I have no idea what to make out of the action with the 2.7mH inductor at ground of the Autotransformer. This thing looks like a mod of some sort, I don't think it's a "Klipsch" network at all. Quote Link to comment Share on other sites More sharing options...
BEC Posted September 26, 2004 Author Share Posted September 26, 2004 Dean, Looks like some of us have some schematics that are suspect. If the AL is like the AL-2 you posted, I think Dennis has hit it right on the head. Still will be difficult to talk a rather non-techincal guy though a fix by email. Bob Quote Link to comment Share on other sites More sharing options...
mikebse2a3 Posted September 26, 2004 Share Posted September 26, 2004 Hey Bob The diagram that ALK gave you is correct. I owned a pair of Lascala in 1989 serial nos.(8825960 & 8825961) and looking back at my drawings of the crossovers that is exactly the way mine were and they were definitly type AL. mike Quote Link to comment Share on other sites More sharing options...
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