I use them for a little over a year, they have a very good rendering of sub bass, ideal with 15 TEUs, for a max rendering, an amp is 4ohms 2x800W idal.toute times they are a little prsentent bulky but well and were going well when it made good entend.Tres qualitprix and I reselect without eSite. (Attensa image above is not a 15 TEUs TEUs 18 SB)