Sand bags under a cdp - didn't work well


Last night I started the process of vibration control with the use of sand bags (3) under my Arcam cdp. What I found was that while everything became more focused/detailed it also became more sharp/harsh/forward/aggressive. I didn't know what to expect but it certaintly wasn't this. Van Morrison's voice on trk #5 on Sailing to Philadelphia was abnormally aggressive and in the end I preferred the sound without the bags. Any thoughts as to why things became too sharp & aggressive????
rgd
Am considering giving the inner tube tweak a try, but have a question. I have a transport and a tube DAC rather than an integrated CDP. Would you put inner tubes under both the transport and DAC? Mine are currently on BDR cones if that matters. Thanks!
Fpeel: I tried the tube on my Bel Canto (under a piece of MDF) and did not like the change in sound. I should be receiving a couple of sets of the least expensive Mapleshade cones later this week and will give them a try under the DAC. The Bel Canto is very light (like a feather) and I think that this is why it did not work very well, though I did not try weighting it down as I had run out of clearance in my cabinet. If you get a tube just try it on everthing. Like I said before it was the best tweak for my little mini system and really made a substantial improvement in the sound quality. I gues that it just depends on the gear and it's location. I wonder what the tube (under a platform) and cones on top would sound like as you would be isolating the platform, plus draining off the internal vibrations from the gear as well.
Spent an hour and $30 yesterday threading nuts onto 5/8" threaded rod to capture 4 mdf shelves between aluminum fender washers, no neoprene. BIG improvement in soundstage but my favorite female vocals became unlistenable: harsh, edgy, grainy, 1986 $99 cd playerish. Didn't have a bicycle tube handy so I grabbed the thin urethane mat off my workbench that holds small parts in place while I sand them, folded it double and put it under 1995 $200 cd player. Soundstage still excellent, speakers almost disappear and the electronic hash/grain is GONE. Gotta get me one a them tubes.
The mat sounds pretty good too. If you get a chance play them off and post the results.
Tube people to maximize benefits of inner tube under CDP, be sure and use torpedo level and make sure CDP is level when sitting on inner tube. If you put dampening weight on top, just shift it around by hand to get perfect level. For tube alone it may have to be located off center under CDP to get perfect level. For a small DAC unit I would go with vibrapods if you want to use sonething to make sound fuller/richer.