I'm building an entertainment center. I plan to put a turntable on the middle shelf in the picture below. There will be a floor standing speaker directly below the shelf. I expect the bass from the music to cause the shelf to slightly vibrate. What can I do to reduce the amount of vibration that occurs on that middle shelf? I'm worried the vibrating will damage the records and/or distort the sound.
As you can see, I've already added an extra 2x4 on the top and bottom of the shelf, but I'm not sure that will actually help (I'd add more if I knew it would help). Do I have any other options? I'd like to keep the floating look so I'm looking for a solution that doesn't involve running chains/wire from above the shelf out to the lip of the shelf. Once I start putting reclaimed wood on the frame, there's no going back - that's why I'm asking now. Thanks!