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1.6 take direct hit!

68.177.0.162
Posted on November 6, 2009 at 07:36:51
maglover
Audiophile

Posts: 4
Joined: November 6, 2009
 Hopefully some of the experts on the board can give me some needed guidance. Me and the wife were sitting on the couch yesterday and she decides to throw dogs squeeky toy. The rubber toy, about the size of a baseball, bounces off the floor and lands smack dab in the middle of the panel towards the bottom of my 1.6. After I regain consciousness, I pick myself up off the floor and poor myself a drink to help ease the pain. I fire up the rig to give it a test and as expected there is now a slight rattle right around the first cross bar towards the bottom of the panel. It seems to be right around the QR tweeter on the left side of the speaker right at the cross bar. The rattle is on certain bass notes at higher volumes. I checked the area over extensively, there is no delam of the wires and everything looks OK. I swapped channels and it does it on either one. It is really only apparent when whithin a foot or so of the speaker, but just knowing it is there is going to drive me nuts. The speakers were sent back to Magnepan a while ago for repair to the other speaker so I am pretty sure that the damage was caused by this incident. Am I stuck reliving this incident in my nightmares every evening or is there a solution, apart from sending them back to Magnepan for another check up?

RE: 1.6 take direct hit!, posted on November 6, 2009 at 09:46:10
Peter Gunn
Manufacturer

Posts: 2932
Location: Pennsylvania
Joined: April 16, 2001
 At first I thought this story was going to have the dog plowing into the maggies.

The good news is a rubber ball really can't damage them.

The bad news is something is wrong and touchy feely isn't going to fix it. Resign yourself to the fact that the socks have to come off, and that means the side trim has to come off, and just do it as carefully as you can.

If your speakers are so old they needed to be sent to the factory the odds are the other poster was correct and that one of your bracing bars has come undone. Magnepan wouldn't have done anything about this and I find when the wires start to go, these things do as well.

Obviously you'll want to check the driver side out as well, but it's likely a bar is your problem. If the ball however popped a mid panel wire, simply DAP it back down.

If it is a bar, check the rest of them while the sock is off. If you can pry them off even a little pull them off all the way and re-epoxy them back on now. You don't want to fix this, resock it, and have it happen again to another bar in 3 months. Note that they are supposed to have a bend in them, so don't lie the driver flat while the epoxy cures. Leave it stand propped upright so the bend can happen.

Good luck with the repair, and I'd have a talk with the other half about throwing things at your speakers in future. :^ )


It's all about the music...
RE: 1.6 take direct hit!, posted on November 6, 2009 at 10:05:57
maglover
Audiophile

Posts: 4
Joined: November 6, 2009
 Thanks! I have reviewed the how-to on resocking and it seem pretty staight forward. Hopefully the brace is the problem and the repair is as simple as it seems. I planned on changing the socks over to white in the coming weeks so I will get a good look at them then and report my findings. The sound is coming from where is bracing is behind the QR so I imagine it is the culprit. If after testing this eve it ends up being different I will let eveyone know.

RE: 1.6 take direct hit!, posted on November 6, 2009 at 12:23:08
Peter Gunn
Manufacturer

Posts: 2932
Location: Pennsylvania
Joined: April 16, 2001
 The hardest thing to do is removing the side trim without it breaking. The socks aren't hard, just tedious as all hell.

Your best bet is to find an old, longish, straight slotted screw driver which is not too wide. Beat it over a vice about 1 inch back from the end to make a slight curve in it, so it looks like a staple lifter. Beat to about 30 degrees, no more. 45 is too steep.

The strips often seem to be best started from the bottom, and you can use a smaller, regular screwdriver to get it started. Then insert your tool in and carefully pry as you get to each nail. If you go slow and yield if you feel it wanting to bend and break instead of lifting you should get all 4 off OK.

As they are nail gun brads, you can't re-use them. Clip them off flush with the wood. If you don't have a power nailer to re-apply the strips, get small brads and pre-drill all your holes or you will likely split the wood.

...and all this work from one errant ball toss........ well, at least you won't have to figure out what to do this weekend. :^ )


It's all about the music...
RE: 1.6 take direct hit!, posted on November 6, 2009 at 07:59:37
neolith
Audiophile

Posts: 1710
Location: Virginia
Joined: February 21, 2002
Contributor
  Since: December 2, 2004
 It sounds like a delam but it is possible the crossbar (I believe these are glued on) is loose. Probably not related to the doggy toy, just coincidental. The only way to be sure is to remove the sock for a close inspection. My guess is that the repair is something you can do yourself, just check the archives and in particular stuff by PG (who will probably be weighing in shortly). If you take care when you remove the sock, you can re-use it.
 
I plan to procrastinate my demise for as long as possible. In the meantime, I practice by putting off all the little stuff.
RE: 1.6 take direct hit!, posted on November 6, 2009 at 08:09:06
maglover
Audiophile

Posts: 4
Joined: November 6, 2009
 I would have suspected delam if not for the fact that they were just at magenepan for a repair. I tried putting my finger as the sound occurs but cannot seem to find any spot that stops it. I will do some frequency sweeps this evening to see if I can pinpoint it.

RE: 1.6 take direct hit!, posted on November 6, 2009 at 19:02:16
maglover
Audiophile

Posts: 4
Joined: November 6, 2009
 So I ran some sweeps and it is a rattles pretty bad right around 60hz about three inches below the second cross brace. The rattle is right behind the QR, if I push down on it until it is against the backing the rattle stops. Is this still a cross bar issue or something else? The rattle seems to be right on the very edge, not so much around the wires but the just the QR. Is the backing vibrating against the cross bar? I am hoping that is the case as I would assume that to indicate it is in fact a loose cross bar.

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