Some vinyl triggering sub to crackle


I have a Clearaudio Innovation Compact going through AR PH7 stage then AR 5SE. My REL Gibraltar sub is connected to a PASS Lab XA200 monobloc then Dynaudio Confidence C4s. Some lps keep triggering my sub to crackle and the front facing driver quivers in and out. Im concerned this would ruin my sub so i sadly just turn it off on some of the records i treasure! Ive turned the REL crossover down to 25 hz and this solves it for some tracks. However other tracks no change in crossover freq helps. Any tips would be greatly appreciated as i believe the sub just completes the sound. 
chenglo1

Showing 3 responses by chenglo1

Update: voice coil was blown. Replaced driver for $570.00 USD and so far so good. Vinyl playing just fine now. I have to break it in over next 24 hrs with not pushing it hard.  Dealer had a demo for sale for 2500...was tempted...as thats 2K off! Ill wait til spring and offer them 2200...
Thanks guys.  Im leaning more towards Rauls explanation as digital gives to issues at all. I have a new Soundsmith Cartridge coming so hopefully the tech can help me troubleshoot when he comes out to install. 
Do you guys recommend a turntable mat? If so which type or model? I think this might decrease feedback. I didnt want to alter the sound at all but may pick one up tomrw.