Gently place one end of a cardboard tube from a paper towel roll around the dome, the other end around your lips, and suck. Works like a charm. Better than pins perforating your domes, high powered vacuums detaching voice coils, or left tape residue on your domes.
Can a "pushed in" dome tweeter + midrange be savev
Grilleless Gershman Sonograms were approached by 4-year old. All six speakers were "pushed in". I'm wondering if there is any way to create a suction or something that would return the domes to their original shape. There is a soft dome tweeter but also a Morel domed midrange. The dust caps in the woofers are pushed in somewhat but I don't think it matters.