@hifiron - A few of different approaches....
1. stiffen the floor - probbly the easiest and most effective
You mentioned the room is over a crawl space
- go under the floor and screw a few 2 x 6’s under the unit (overlapping it by a couple of joists
- simply place the 2 x 6 flat against the joist and put a couple of 3" screws into every joist it crosses
- you will be very surprised at how much difference it will make
2. Magnetic Isolation
https://www.youtube.com/watch?v=74F7odDKL4Y
3. There are a variety of Herbies isolation devices that might work
http://herbiesaudiolab.net/special.htm
4. Employ a cushion isolation device under the TT.
They can be purchased online
https://www.amazon.ca/Auralex-SubDude-II-Subwoofer-Acoustic-Isolation/dp/B00DI5AXNI/ref=pd_lpo_sbs_2...
OR are simple to DIY...
- Build a box similar in size to TT base about 1.5 inches high
- place a bicycle inner tube insude
- place a piece of MDF on the inner tube (cut to about 1/4" smaller than the inside dimension of the box
- place a piece of granite on top of the MDF
The granite will stabilize the TT
- the inner tube will absorb the vibration from the floor and will not move the granite
- Drawback: you have to pump it up now and again
You could probably use the Herbies Medicine Ball in place of the inner tube - no drawback!
You really need to address the root cause - buying a different TT or cartridge will not do the trick
Hope that helps
1. stiffen the floor - probbly the easiest and most effective
You mentioned the room is over a crawl space
- go under the floor and screw a few 2 x 6’s under the unit (overlapping it by a couple of joists
- simply place the 2 x 6 flat against the joist and put a couple of 3" screws into every joist it crosses
- you will be very surprised at how much difference it will make
2. Magnetic Isolation
https://www.youtube.com/watch?v=74F7odDKL4Y
3. There are a variety of Herbies isolation devices that might work
http://herbiesaudiolab.net/special.htm
4. Employ a cushion isolation device under the TT.
They can be purchased online
https://www.amazon.ca/Auralex-SubDude-II-Subwoofer-Acoustic-Isolation/dp/B00DI5AXNI/ref=pd_lpo_sbs_2...
OR are simple to DIY...
- Build a box similar in size to TT base about 1.5 inches high
- place a bicycle inner tube insude
- place a piece of MDF on the inner tube (cut to about 1/4" smaller than the inside dimension of the box
- place a piece of granite on top of the MDF
The granite will stabilize the TT
- the inner tube will absorb the vibration from the floor and will not move the granite
- Drawback: you have to pump it up now and again
You could probably use the Herbies Medicine Ball in place of the inner tube - no drawback!
You really need to address the root cause - buying a different TT or cartridge will not do the trick
Hope that helps