Jump to content

Chours II & Forte II Crossover and resto & soem JBL Century stuff too


Recommended Posts

I am finally completing my Chorus II and Forte II crossovers.  I will post when I do the rebuilds, hopefully this weekend.  I received these badges today from the guy in Russia.   They are very nice. 

 

I am looking for grill cloth, likely the Silver Luster Grill Cloth if Duracrest has it in stock.  Does he have it in stock now? 

Can anyone point me in the direction for a set of plans to build the grill frames?  I want to build a second set from scratch.  I can do it but why re-invent the wheel. 

 

IMG_3071 - Copy.JPG

Link to comment
Share on other sites

I need to recap my JBL 4311s... I thought about one of the aftermarket designs, but they are really too expensive.

 

Also have some Sansui SP2000s that I'm pretty positive need new caps, or they just sound bad. Won't know until I get one done to compare.

Link to comment
Share on other sites

16 minutes ago, Marvel said:

I need to recap my JBL 4311s... I thought about one of the aftermarket designs, but they are really too expensive.

 

Also have some Sansui SP2000s that I'm pretty positive need new caps, or they just sound bad. Won't know until I get one done to compare.

I think that I paid $8 shipped for the tweeter foams (I know that you need these).

 

I would not change the JBL crossovers to a different design.  I read that they do not sound any better and in any event, I want these to sound just like they did when new, rolled off top and a hump in the bass and all.  That is what they are and how I want them to sound. 

 

I kept hearing that the caps are still good in the JBLs because they are 'good for 50 years.'  Well I did the math and realized that they are about due.  Actually, the L pads are worn out so I figured it was time.  This was actually quite a bit of work, especially figuring out a layout that fit on the dimension of the stock boards with the oversized L Pads and barrier strips.  The depth of the L Pad stems was also an issue, bet easily solved by going to 1/2" wood.  Luckily I had a bunch of leftover 1/2" baltic birch.  If you just need caps, it should be very easy on the 4311.  The L100 Century requires that you remove the foilcal.  I am going to fix that problem. 

Link to comment
Share on other sites

You have to remove the foilcal on the 4311s, too.

 

I may have a broken lead on one of the tweeters, and the replacements aren't near the same. If I can fet by by simply replacing the foam rings it will be a good thing.

Link to comment
Share on other sites

16 hours ago, Marvel said:

You have to remove the foilcal on the 4311s, too.

 

I may have a broken lead on one of the tweeters, and the replacements aren't near the same. If I can fet by by simply replacing the foam rings it will be a good thing.

A delicate job, but you can get some stranded wire, remove a wire of about the same size and fix the lead if there is room to work.  Just a delicate dab of solder. 

 

I also put scotch tape below and above the leads before putting the new foams on.  If I ever need to remove the foams, they will pull the scotch tape off instead of the leads. 

 

Boy, no love for my crossovers on this forum.

Link to comment
Share on other sites

Forte II crossovers are done.  I was able to mount the 1.5 uF cap on the board, the rest had to be moved. 

 

All ends are soldered, crimps are crimped, soldered and heat shrinked.  The boards are meant to go in the bottom of the speaker on 1/2 spacers that I ripped from the Baltic birch scraps.  I used open ended lugs on these connections to make it easier to install when reaching into the speaker.  I made the boards relatively small to allow plenty of space for bracing if I go that route.  

IMG_3087.JPG

IMG_3089.JPG

IMG_3091.JPG

  • Like 1
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...