Hola...if you open your new Summits to see what´s inside, you could void your warranty..
I don't think ML will void your warranty just for opening it up and looking inside. However, if you do unauthorized mods then that's another story. ML sometimes sends replacement parts to the owner as long as the owner is comfortable with doing the parts replacement him/herself. It's usually much easier and safer than packaging and shipping a Summit.
I replaced an Ice Power Amp module in a Summit and posted the procedure with photos on the DIY section. When I did I looked over the amp carefully but did not see any jumpers or other that allowed you to cahnge the voltage. However, I did not open the front cabinet so I don't know what is in there. To change to 220/50z you probably need the replacement part from ML.
If you bought used speakers from the US then would ML make you go through a dealer for parts to make it work for your voltage?. I don't know the answer but I'm confident they would do thier best to support you as long as they didn't violate any trade agreements or disturb thier oversease distributor relations.
Here's the link http://www.martinloganowners.com/~tdacquis/forum/showthread.php?t=2090
Last edited: