My Aura Pro Shakers arrived last night. I mounted them all up and tested them out. It seems I don't have enough headroom on my old Sansui amp. Even with the volume all the way up I can barely feel them at my normal listening level. Of course when I crank it up they start shaking real good. At the volume I listen at(-40 on my Yamaha-max) I guess the sub output is very low and doesn't give the amp the input it needs to really drive the shakers. I don't know exactly how much power the amp has but I assume it's at least the 50W the shakers require. What do I do? I can set the speaker levels lower and just use a higher volume, or get a stronger amp. what amps do all of you use to do the job? Thanks!