Review on 2 Pack Apple Lightning to USB3 Camera Adapter - Portable USB 3.0 Adapter for iPhone (Lightning Charging Port + USB Female OTG Adapter) by James Wiley

They did a very good job removing the bass hum from the speakers on the floor. I've also used them in combination with rubber pads under the platter - and now I can play vinyl again without howling feedback. For the price they are highly recommended. I used the "inverted" approach with a single bottom bezel so the speakers faced slightly up (and the front rounded part was at the back). They look good and are mostly unobtrusive visually. I would definitely buy them again.