soulpianoman Posted December 8, 2004 Share Posted December 8, 2004 Greetings and salutations - first time post, I have a problem with a pair of Heresy II's made in 1985. As a pair they sound pretty darn good, but upon critical listening I have discovered that my right speaker's tweeter is barely tweeting. I swapped tweeters with the other speaker and no change - works fine in the other one (I thought maybe the tweeter was bad, but apparently not...). I don't know if the horn and woofer are affected too (seems like just the tweeter but not sure). Overall this right speaker has much less clarity and just does not sound as good as the other one. Any ideas what I should look into or what the problem could be? Thanks for any help Ted Quote Link to comment Share on other sites More sharing options...
colterphoto1 Posted December 8, 2004 Share Posted December 8, 2004 if that tweeter works fine in the other cabinet, could be connections at the crossover, be careful to note where the wire is hooked up if you remove it. Could also be at receiver, swap leads there to eliminate it as the cause of the untweeter. Best luck and welcome aboard. You've come to the right place. Michael Quote Link to comment Share on other sites More sharing options...
Frzninvt Posted December 8, 2004 Share Posted December 8, 2004 The crossover for the HII can be removed from the back of the speaker. Carefully remove the screws, I think you may have a cold solder joint for the capacitor in the tweeter circuit. Should be an easy fix. You have already done the correct troubleshooting by trying the suspect tweeter in the other speaker and it performed correctly, so onto the wiring and crossover. Quote Link to comment Share on other sites More sharing options...
soulpianoman Posted December 8, 2004 Author Share Posted December 8, 2004 Thank you kindly, I'll try these next steps. Another quick question related to this: I noticed when I removed the untweeter that the connection was different than on the working tweeter - black wire was to positive, green wire was to negative - it was opposite on the working tweeter - should these connections be opposite or should they be the same? I tried switching the wires (perhaps stupidly) and it made no sonic difference, so I'll move on to the steps outlined above, but wanted to know what the correct wiring for the tweeter is anyway. Quote Link to comment Share on other sites More sharing options...
Frzninvt Posted December 8, 2004 Share Posted December 8, 2004 They should be the same on both speakers, so one tweeter may have been out of phase. Connect the leads identical to the other speaker, the colors should not vary. It being out of phase may have damaged it, but put it in phase and listen first. If you still have dimished output, check the crossover for loose wires or components. If everything is in order you may have to replace the diaphram in that tweeter which is about a $25 fix with shipping. Quote Link to comment Share on other sites More sharing options...
soulpianoman Posted December 9, 2004 Author Share Posted December 9, 2004 OK, after taking this speaker apart, checking all the connections etc. (which all seemed fine), I discovered that one of the orange capacitors is exploded - specifically the one that is directly next to the big blue capacitor. It is marked T1 1.5J 250V - Can anyone tell me what the microfarad rating is on this and where to get this cap? Also does it make sense to take this oppurtunity to upgrade to different caps and if so any recommendations? Finally, is this exploded cap the cause of the orinal problem? (The sound of this speaker was just plain not as clear/responsive as the other one and the tweeter was very faint.) Thanks so much. Quote Link to comment Share on other sites More sharing options...
J.4knee Posted December 9, 2004 Share Posted December 9, 2004 the caps in the tweeter ckt are 2 ufd, truth be told if they are 85 HII's you should probably entertain the idea of rebuilding the crossovers completely with newer/better components. You can get most parts at "http://www.partsexpress.com" Quote Link to comment Share on other sites More sharing options...
soulpianoman Posted December 9, 2004 Author Share Posted December 9, 2004 Actually, I guess these were made in 1990 according to stamp on the woofer. Would these caps work even though they are rated 200V instead of 250V - Audiocap PPT theta 2.0uf-200V Quote Link to comment Share on other sites More sharing options...
Frzninvt Posted December 9, 2004 Share Posted December 9, 2004 Pianoman, contact DeanG he can get you the caps that you need cheaper than Parts Express sells them for if I am not mistaken. The 200V vs. 250V rating should be fine I would think. In the event that you need a HII schematic I have posted one for you. Upgrading the caps in there will yield very favorable improvements. Quote Link to comment Share on other sites More sharing options...
J.4knee Posted December 9, 2004 Share Posted December 9, 2004 Actually Dean can do a heck of a job doing a rebuild for you. Quote Link to comment Share on other sites More sharing options...
soulpianoman Posted December 9, 2004 Author Share Posted December 9, 2004 Thank you a lot for the help guys. Frzninvt, I really appreciate the schematic. I assume I would replace all 3 of the caps in each speaker network for a total of six - is this right? I also noticed on the schematic you posted, they were listed at 1.5uf rather than 2.0uf, should I be using the 2.0uf replacements? Sorry for the zillion questions - I am brand new to this. Quote Link to comment Share on other sites More sharing options...
Frzninvt Posted December 9, 2004 Share Posted December 9, 2004 No, I would replace the components with values that are identical to what is in there. Otherwise things just won't sound right. Quote Link to comment Share on other sites More sharing options...
popbumper Posted December 9, 2004 Share Posted December 9, 2004 Soulpianoman: Your biggest challenge will be to "fit" better caps onto the existing board, since aftermarket quality caps are typically much larger than stock units. Dean G. comes highly recommended as a resource should you not desire to do it yourself. Popbumper Quote Link to comment Share on other sites More sharing options...
J.4knee Posted December 9, 2004 Share Posted December 9, 2004 Frzn, Interestgin you schematic for the HII network differs from mine, yours does not have the resistor in the tweeter ckt. Mine shows the caps as 2 UFD I may have a bad schemtic I'll post it when I get home. Quote Link to comment Share on other sites More sharing options...
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