Thiel 3.7's, which I own, are speakers for those who prize transparency over other qualities. They are most definitely not bright and I think that using them with less than 200-250 wc high current amps will not allow them to sound their best. If you are asking whether they rock, it seems to be you are asking a question that indicates these speakers are not for you. In the same used price bracket I would look at Wilson sophia IIs for bass dynamics.