The woofer excursions could be caused by the cartridge compliance not being optimal for the tone arm. Are you using a Linn cartridge/arm combo? I would assume that in a Linn arm,Linn cartridges will work correctly but some other cartridges may be of to high or of too low comlpiance to not cause some osilation. My suspicion would be that for the sort of woofer movment you are describing that it may be the cartridge is too high in compliance for the given mass of the arm.
The isolation ideas are always very good even if you do have a good arm/cartridge match. I don't think you can ever have too much isolation from vibration, especially with a turntable. The stylus can read a groove deflection as samll as a millionth of an inch and any vibration at that point will also be amplified along with the signal.
The isolation ideas are always very good even if you do have a good arm/cartridge match. I don't think you can ever have too much isolation from vibration, especially with a turntable. The stylus can read a groove deflection as samll as a millionth of an inch and any vibration at that point will also be amplified along with the signal.