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MMGs vibrating

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Posted on May 26, 2016 at 17:16:09
srwilsonmiami
Audiophile

Posts: 19
Location: South Florida
Joined: March 15, 2016
 I am not sure what's going on. I have a 3 month old pair of MMGs and probably have 150 hrs on them. They are driven by an Audio Research preamp and an Odyssey amp. They are 40" from the rear wall in a12x14 room. They are in the lean back position and placed on carpet. On certain tracks with deep bass they vibrate/distort. It seems like a certain frequency throws them off. The volume is about 85db with up to 93db peaks.
The tracks I've noticed on are the lead track off the Twin Peaks soundtrack and All it Nothing at All on Diana Krall's Love Scenes. I never had this issue when I had 1.6qr.

 

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RE: MMGs vibrating, posted on May 26, 2016 at 18:57:29
j beede
Audiophile

Posts: 239
Location: NorCal
Joined: March 28, 2011
 Just to make sure... you are referring to your MMGs in the plural sense. So... both speakers are exhibiting what you call "vibrating"?

 

RE: MMGs vibrating, posted on May 27, 2016 at 06:43:19
neolith
Audiophile

Posts: 4842
Location: Virginia
Joined: February 21, 2002
Contributor
  Since: December 2, 2004
 From your description, it sounds like a delamination problem. Try playing some bass heavy music or better yet download a frequency generator.
There are several free programs available - I use a simple one that is available from Marchand - and find a frequency that replicates the problem. Then while playing, lightly press over the bass panel to see if you can suppress the vibration.
In any case the panels should not be doing this and you should either contact your dealer or Magnepan for warranty coverage.



"Our head is round in order to allow our thoughts to change direction." Francis Picabia

 

RE: MMGs vibrating, posted on May 27, 2016 at 07:14:20
Davey
 Yes, if both speakers are exhibiting the issue, then it's probably not a transducer failure or degradation. But, it could be. :)

Most likely the speakers are just being driven too hard and/or there's some low-frequency information in the program material they're just not capable of reproducing. The 1.6's have quite a bit more transducer area to create larger SPL's.

Dave.

 

RE: MMGs vibrating, posted on May 27, 2016 at 07:38:46
guitar slim
Audiophile

Posts: 168
Location: Washington DC suburbs
Joined: May 24, 2012
I don't know if this is relevant to MMGs, but my T-IVs had a similar symptom when I first got them. There was a buzzing/vibration when playing loud, low tones, around 30 HZ or so.

I called Magnepan about it and a technician told me to use the handle-end of a screwdriver to push on the staples that secure the bass panels to the MDF and tighten them up. Problem solved. Does Magnepan still use this primitive way to secure bass panels to the MDF?

 

RE: MMGs vibrating, posted on May 27, 2016 at 08:06:26
Roger Gustavsson
Audiophile

Posts: 2055
Location: Huskvarna
Joined: February 12, 2010
 I think they still use staples! My Tympani IIIA made in 1975 had its drivers glued and revited - no rattling.

 

wow good info nt, posted on May 27, 2016 at 09:41:55
Green Lantern
Audiophile

Posts: 16952
Location: San Diego, Ca
Joined: November 12, 2002
Contributor
  Since: June 17, 2003









 

RE: MMGs vibrating, posted on May 27, 2016 at 13:39:46
srwilsonmiami
Audiophile

Posts: 19
Location: South Florida
Joined: March 15, 2016
 They are both vibrating in the same manner. I switched sides anyway and the same. I think they just can't handle certain low frequencies, like the larger model. Do you think if I add a sub it would take some of the demand off the panel? I'm not ready to invest in a good sub but I have access to a Definitive Technology Prosub 100. It's a powered sub that takes speaker level connections so I would route the speaker cable from the amp to it first and then from the sub to the MMGs. It has adjustable crossover. Might that be a temporary fix?

 

RE: MMGs vibrating, posted on May 27, 2016 at 15:17:19
Satie
Audiophile

Posts: 5426
Joined: July 6, 2002
 That would definitely take the load off the MMGs but you will lose clarity because the sub's crossover has a midling quality speaker level crossover. You should get a quality external crossover at line level if that loss of resolution bothers you. If you want to DIY the MMG's line level high pass filter it is very simple and dirt cheap. Any number of us can help you with it.

 

RE: MMGs vibrating, posted on May 27, 2016 at 16:26:10
RickeyM
Audiophile

Posts: 2208
Location: East Coast
Joined: March 15, 2003
 "and placed on carpet." Could be a case of the speakers aren't making solid contact with the floor. Try playing them on a hard, solid surface to see if the problem persists.

 

RE: MMGs vibrating or something in the room vibrating?, posted on May 31, 2016 at 09:31:01
BigguyinATL
Manufacturer

Posts: 3475
Joined: April 10, 2002
 sometimes it's hard to telll...


"The hardest thing of all is to find a black cat in a dark room, especially if there is no cat" - Confucius

 

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