I've always found D'Addario to be very helpful. On one occasion a customer returned to me
a day after collecting his guitar because the wound E had developed a kink over night. I
replaced the string from my singles box and sent the damaged one and the packaging to
D'Addario with a polite letter explaining that I had examined the instrument carefully and
that there was no evidence of it receiving a hard knock that might have damaged the
It wasn't even a complaint letter, just letting them know what happened
and sending the string and packaging in case that would help their quality control. I
received a personal reply from James D'Addario with a replacement for the damaged string
and a complimentary set.
As you have bought a box of 10 sets I would keep the
packaging for the new set you have put on. So you have it available when D'Addario support
get back to you, just in case it turns out to be useful.
It could be a bad
batch, but I have my doubts. Both strings have broken at the saddle after a few weeks use,
so that could be a set-up issue. With wound strings all the tension is taken by the core
and on a wound D that core is closer to a 10 but the tension is higher than a plain 10. So
it is a string that is vulnerable to wear and tear.
If the saddles are rough,
they should be smoothed. Use wet and dry paper to remove all sharp edges and burrs, you
need to minimise friction here and avoid sharp edges, the top of the saddle should be
One last possibility, if you bought through eBay there is a
possibility that they are fake D'Addarios.
Hope that helps.
When the going gets weird, the Weird turn Pro.