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The answer is yes, but exactly how much and whether it's bad is debatable. Glass has a bad reputation among some audiophiles. You'll find comments about ringing and glass adding a hardness to the sound of components. In the past I've used glass and didn't have any problems, but I was using fairly thick 1/2 inch slabs. If you want to experiment I would suggest starting with rubber or cork type footers to see if you notice an improvements in sound quality.
All my racks have glass shelving clamped at the sides in 'U' shaped slots.
I added packing to the slots, (besides the nylon clamping setscrews)
Then most of my stuff is on butyl rubber feet (under the stock feet) and/or clamped between the shelves above and below.
I have no problems with using these racks.
The ywere cheap, pretty, and the frame was sand fillable. Which I did.
They are never going to be replaced.
Naturally they are an odd brand i never heard of before, and have never seen in years since i bought the three I use.
For my Sound Organisation rack with glass shelves I used two strips of 1" x 8" Black Hole Pad adhesive dampening material on the surface of the glass beneath each shelf. This helps to dampen any ringing.
If the glass sits on a supporting frame the use of a relatively soft supporting material can also help. Herbie's Audio Lab Grungebuster Dots would be a good choice for this application.
The Tenderfeet recommended is a good choice to interface between the equipment and glass shelf. I've had very good results with these and the Iso-Cups and balls noted above. The Supersonic Stabilizers are usually used for chassis vibration. I don't have enough experience with them to make a firm recommendation but they may be helpful to you.
I'd give Steve's recommendations a try. Fortunately Herbie's Audio Lab has a 90-day Trial Period on all products for full refund or exchange for a different product so you'll will not be stuck with something that does not provide a satisfying solution.
like some of the other members I use a bit of glass under my CDP & have not had any issues with the sound for the last 10 years.
I tried granite & marble - both made the sound harsh. I know why. I also tried a teak wooden shelf & that made the sound too rich (bass heavy). So, glass was the most neutral believe it or not!
And, the glass is sitting on rollerballs & is not damped on the underside at all. Howzzat, eh?? Goes against the grain of thought......
Just my 22 dollars solution to the glass issue . I bought 5 plain cork tiles at Home Depot( $15) and a jar of wood glue ($8) ,brush the glue on the tiles , clamped them together for 24 hours, put a finishing blade in my jigsaw, and cut 2 x 2 " squares , placed that on my 1/2 " glass shelves, and I think it made a very small difference in the trebles. I think?
Nice catch geoffkait, Mana was once a very well respected isolation platform. I have two and have never noticed the glass shelves to be a detriment. Though I did prefer a Neuance platform the best under my Sondek Lp12 on Mana’s reference rack, the glass was better than the commonly excepted standard maple block cutting board. So, go figure.
People love to parrot simple ideas/answers like "glass rings" that the real audio world continually proves to those who listen that there just are are no absolutes.