Maybe I missed it, but which circle is of the DX and which is of the JBC?
The top one is from paper, I take it a different shade of paper from that on which you
placed the circles.
The background on my JBL looks just a little lighter than the bottom right circle, in
normal room lighting. If I hold it tilted away from the light, I might be able to get it
as dark as the bottom right circle's background. Even then it remains readable.