Have any of you ever replaced Magnepan 1.7 or 1.6 tweeters?


It's looking like I might have a problem with my Maggies. A buzzing/crackling in the range of 4k to 8k happens when the music gets more intense, most easily to male voices, when multiple voices join in on a chorus.  The problem just started about nine months ago, but now it's getting worse.  I have checked/replaced everything in my system and wiring and have come to the conclusion it must be the Maggies.
I have never looked at the socks or the staples, much less tried to remove them and work on the speakers.  I am pretty handy and own a wide assortment of mechanical and woodworking tools.  
If you have replaced your tweeters yourself please share some insight.  As I understand it, removing the socks and putting them back on is the most difficult part.  Is that so?  Sounds tedious, but not necessarily difficult. 
How are the tweeters attached?  I would be buying replacement tweeters, not trying to repair my current tweeters.  Are they glued on?  Any trick to getting them off & on?  How do you insure they are down tight and will stay tight?  Any special prep work?  Do you just solder the connections together using regular solder?  I read somewhere there is a special solder you should use.

Lots of question.
Thanks 

Toolbox
toolbox149
check email....sent you some you-tube videos
Thanks.   I’ve actually seen those, but I have a pair of 1.6s and 1.7s, which I seem to be constructed with fairly differant materials, tweeter wise.  I think Magnepan sends you a tweeter in a tube and you install it in place of the old one.  Not sure though.

Toolbox
toolbox149,
   
     I think you may want to consider more thoroughly identifying the problem before proceeding to fix it.  It could be some magnets, that are connected at various points on the stretched mylar panel, have loosened and clatter when driven hard.
     I had tis with my 1st pair of Magnepan IIBs years ago.  I didn't think of it as a tweeter issue, however, and noticed it more on the bass and midrange in my speakers.  At higher volumes I noticed a clapping or clattering sound that was more like a vibration.   After researching on the internet, I discovered this was a somewhat common issue that was caused by the glue that Magnepan used at that time failing.  Magnepan had found a glue from 3M that remedied this issue. I decided to just buy a newer pair of used 2.7qrs rather than send them to Magnepan for regluing.
     Your 1.6 or 1.7s are newer and it sounds like you'd rather have them repaired.  So I'd suggest calling Magnepan to get their thoughts and a quote on repairs.  I understand you're  handy but it may be best to have them professionally repaired. I know boxing them up and shipping them to Minnesota is a pain but they may already have developed a better glue and process. Plus they'll likely give you a limited warranty on the repairs.

Hope this helped some,
    Tim
Thanks,
Actually, I received an estimate from Magnepan and the cost of their estimate, plus the freight to and from Minnesota, was as much or more than the 1.6s are worth.

Toolbox
time for some 1.7i

the x.7 are a big upgrade...

     That's a good idea, Randy.  The 1.7i are reviewed as being a big improvement from the 1.6 and 1.7.
     Maybe toolbox149 could find a dealer to take his speakers as a trade-in.  Let them repair them if they're willing.
  Tim
IMO, since the speakers aren't really "functional" in the audiophile sense and since sending to MN isn't worth the expense, you really have little risk of trying to make the diagnosis and then repair on your own.  I have re-socked a pair of 1.6s and it's really not at all difficult. 

First, each of the wood trim strips must carefully be removed.  Use a long, but thin screwdriver and start from either end.  Insert the blade of the screwdriver between the panel and (parallel to) the wood strip and very gently pry a little then push the blade further along--keep repeating.  The wood strips are held in with small brads/pins and release pretty easily BUT if you pry too much when the blade is not right at each pin, you could crack or break the trim strip.  

Once each trim strip is removed, you will want to pull all the brads through the wood (NOT try to push them back out the way they were originally inserted).  Just grab with pliers and pull.  Some brads MAY remain in the panels themselves, while others may "go" with the strips.

Next, remove all the staples from the bottom and roll the sock off the speaker.  Now, you'll be able to see if the problem is visually obvious.  From that point, a consultation with Magnepan might be your next best bet in terms of advice on how to repair at home.  Could be a case of delamination that may be easily repairable using (and properly applying) the right kind of adhesive.  Also, would ask about cure time for the adhesive, as well as an advice on surface prep.  FYI, there is also some "tape" around the perimeter of speaker that might have come unstuck due to the adhesive aging so check that as well.

As far as re-assembly, the sock is probably the most difficult part (I had ordered new socks in my case--really refreshed the speakers visually). Once that's back on and stapled, you'll replace the trim strips but using NEW holes.  I used a compressor and pneumatic pin nailer which made reinstallation of the trim strips a breeze, with each pin countersunk into the wood a bit.  A bit of color matched fill wax to cover the new pin heads (and fill any holes from the original pins) was all that was left to make them look perfect.
 Kjweisner,

Thanks!
A couple of questions:
Which Maggies did you work on, the 1.6s or the 1.7s?  I would probably attempt to repair my 1.6s first.  (Practice on the older ones first).
If the problem isn't a tear or a localized stretch of glue coming loose, do you think replacing the tweeters and or midrange is a feasible task?  How are the tweeter and midrange components fastened in place?


If you buy new Magnapans, you could disable (remove?) the tweeters from the old ones and keep the remainder for bass reinforcement. BTW, how far past the warranty period before the failure?
I did 1.6s and can’t offer any advice on the 1.7s.  As for “replacing” either driver, thats not even a consideration as the entire panel is a single piece of material.  What constitutes the tweeter is a portion of the panel where the conductive material is configured differently.   In reality, it’s one big driver panel with a high frequency zone.  Hope that explanation makes sense.
Thanks Addyson815, Kjweisner, and everybody else.

I was thinking that the tweeters were separate, like the 3.6 and 3.7 tweeters, and that if the tweeters were not repairable I could get them off and replace them. Not so.
I got a return phone call from Magnepan yesterday and was informed the replacement kit consists of new wire and the glue. You have to lay the wire out and glue it all down - no pre-made section to work with.
Because my buzzing problem is still relatively mild, I'll try to go in, find the problem areas and re-glue them. I have a pretty fair background in machining and woodworking so I think I have as good a chance for success as just about anybody.
The Peter Gunn video is really helpful.
My biggest concern, right now, is getting the water-based glue delivered during the winter season. I'm going to try to have some shipped to a UPS pickup location. That way it won't sit outside my front door for hours, in sub-freezing temperatures, waiting for me to get home.
I'm sure I'll have a few more questions as I get into the project, but right now I guess it's time for me to roll up my sleeves (I guess I mean, roll up my socks) and get started.
I'll keep you all posted.

Tim
Hey Tim,

If you have the opportunity to photo document your project, I'm sure it will be helpful for others down the line!  Just throwing that out there for consideration.  And since you're pulling the trim and socks, you might even consider if you want to change your look.  I think the socks cost about $80 pair and I assume you could paint or refinish the wooden trim.  For example, my trim was "Cherry" but I think it was really just cherry-stained poplar and could have been sanded and restrained to any color. 

Best of luck and I look forward to hearing how your project goes.  

Kevin
Have you checked the condition of the speaker's protection fuse? Maybe it's damaged but not totally blown.