Specifications not on the UltraFit 500's
I saw a box of the Polk Audio UltraFit 500's with a price of $49.99 in the local Fry's Electronics Store.
I looked at the box and double-checked each side of the box, and there were no specifications to be found anywhere on the box exterior, just the same marketing wording that is on the website. However, the Sony MDR J10 headphones just to the left and priced at $9.99 had all the relevant sensitivity, impedance and frequency response numbers right on the back of the package.
I put the Polk Audio UltraFit 500's back on the shelf, I did not buy them. I don't want to have to call for specifications, so until Polk Audio can put those numbers clearly on the outside of the box, I won't be buying the Polk Audio UltraFit headphones anytime soon. That's too bad, because I specifically stopped by Fry's just to see about the Polk Audio headphones.