The arc should loosen up with enough time being stretched, just be careful its not stretched too far out as its liable to snap at various places. IIRC the arc on the SR-507/SR-L500/SR-L700 uses a more flexible plastic and should be more comfortable in terms of clamp.Is there a way to adjust the fit of the SR-x07 model Lambdas? I have a 407, and the clamp pressure is killing me. If I use my hands to pull the earcups apart just slightly it's fine, but otherwise it's so bad that it doesn't matter what they sound like.
I don't have any real hope that the old trick of leaving them gripped on the box overnight will work due to the plastic headband, and I don't want to risk doing anything that the next owner might not like because I'm pretty sure I'm going to have to sell them.
Are all the new Lambdas like this? My next choice is the L300, but if it's got the same clamp I'd rather not bother.
The L300 would most likely be even worse for you since its cups aren't designed to swivel fully (same with the L500 and L700 I believe). Skip to the part in my notes where I mention the "restraining tabs" and have a look at the accompanying photos to see what I mean: https://www.head-fi.org/showcase/stax-srs-3100.22188/reviews.
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