Hi,
The Axiom audio loudspeakers have the ability/capability to play at high volume without showing any signs of stress. It makes them an easy target for being overdriven. Even at moderate listening volume a demanding dynamic swing will easily send the amplifier into severe clipping which generates distortion that will damage the transducers (in your case woofers).

Your Marantz receiver as all audio/video receivers is way too optimistic when quoting its power. A good indicator of the real available power is to verify its maximum power consumption. In the case of your Marantz it is 650 watts. It is common knowledge that the efficiency of a non-digital amplifer is slightly over 50%.So the total power of the mplification generated is approximately 325 watts; divided by 7 channels you end up with less than 50 watts per channel.

To extract, explore and truly enjoy the performance of Axiom top model loudspeakers a dedicated standalone powerful amplifier is highly recommended (a must).

Last edited by Jc; 04/16/18 03:56 PM.

jc