Rlmm:
Glad you found the source of the low-end vibration. However, it seems that the C7s are indeed vulberable to some mild buzz at very low bass extremes, at high volume. I wa playing one of Stereophile's reference CDs the other day, and on a Stanley Clarke track the lowest registers of the acoustic bass caused some buzz-type vibration. Never heard it under any other circumstances, and it disappeared when I backed my amp off a bit. I guess $2500 speakers have to have a least a few limitations. Even so, I love 'em.
Glad you found the source of the low-end vibration. However, it seems that the C7s are indeed vulberable to some mild buzz at very low bass extremes, at high volume. I wa playing one of Stereophile's reference CDs the other day, and on a Stanley Clarke track the lowest registers of the acoustic bass caused some buzz-type vibration. Never heard it under any other circumstances, and it disappeared when I backed my amp off a bit. I guess $2500 speakers have to have a least a few limitations. Even so, I love 'em.