Well its been a couple of weeks since I added the Samson amp to my Dual SVS 20-39cs with the Improved driver and no matter what I do I have never heard a "clack". I see the amp clipping hard but hear no clack. I assume since I am not hearing it bottom, if there is no distortion I could keep pushing these subs to see what they can do. I was reference +5 db's and I had no problems on TPM THX. Maybe these new drivers are extremely hard to bottom.