Update and solution.
Since I did not open the boxes right after delivery, but a couple of weeks later, the shipping company laughed at any claim..
I had arguments with the seller, since a local distributor said to him this wave pattern was from being over driven..
Out of options, I emailed Wendell, begging for his opinion and he was very clear this was a shipping damage, also emailing our distributor and straightened that out.
Luckily now money is back on my account and the speakers will be picked up for delivery back.
Could not really hope for such a good solution in the end. Now hunting for a pair of 1.7's again, might buy new this time..