With average use how long for panel replacement ML

In general, it's pretty much agreed upon, that every 12-15 years you should replace the panels with normal use. The cost of replacement panels just skyrocketed, so I would check with Jim Powers, (I agree, Jim is a GREAT guy) to see how much the panels would be for your model. You can tell the manufactered date of the panel by the serial number of the panel, see link below.

I also agree that new panels equal, more or less, a new speaker. New panels do need to break-in and will need to be replaced in pairs.

No matter which model you buy, you will enjoy them. They really are terrific speakers.

http://www.martinloganowners.com/forum/showthread.php?t=5178

I just replaced my panels in the Ascent for $850.00 cost, it was easy to do and they sound like new. The panels according to Martin Logan generally have a lifespan of 10yrs. The new panels come with a 5yr quarantee

Just buy some Magnepan's

Sorry, Mac, but EVEN Magnepan panels have there own assorted problems.
Hi humidity? They apparently don't like it either.
The aluminum wire can corrode after years and the adhesive, 3m77 with overcoat only lasts so long. I am told it doesn't like UV, from direct sun, perhaps.
I had my 1st set of panels remanufactured when they were about 20+ years old when the HF part of the panel simply failed.
Everything mechanical or Electromechanical lasts only so long. Sorry, but that's the way it is.

I concure with Magfan...can you say delamination? With the Martin Logan's, you can buy a new set of panels which are pretty easy to install yourself. When a Magnepan goes down, it's pretty much a complete and messy internal surgery to repair yourself or a very expensive trip, (freight) to the factory and back.