A few months back, I purchased a used pair of Magnepan 2.7 speakers for my son's system. Although he is quite happy, he asked some questions I can't answer and seek your help.
What do "Tweeter attenuator" and "Midrange attenuator" mean? Are the extra speaker inputs for biwiring or are they supposed to just fit the small "U"-shaped metal bars that came with the speaker? Are there any outboard crossovers available for this model? For my taste, these speakers are a tad bright although they are remarkably transparent. Can some of this brightness be modified?
Vvrinc: Radio Shack sells 1-ohm 10w resistors. They are a dollar or so each. What I suggest you do is buy 4 of these. This would allow you to use 2 per side to try out 0.5, 1 and 2 ohms to find a value that gets the level to your liking. Once you find the value you like, you can find a higher quality "audiograde" resistor to replace the RS parts. There are many online sites that cater to DIY audio hobbyists with high-grade electronic components.
These power resistors have relatively thick leads. You can bend the ends 2 or 3 times and put these directly in the socket currently being occupied by the metal jumpers. There's no need to solder the resistors to banana or other connectors first.
Mab: There are a lot of DIY Maggie owners out there who have bypassed fuses and attentuator connections, replaced internal crossover components, rebuilt external crossover boxes, etc. I am sure that with a little effort, anyone could configure the 2.7's to be biamped. It would just void any remaining warranty.
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