What is the max. the SI HT18D4' can handle? I know a lot of people myself included are giving them 1100watts. As much as I like how these perform I have been thinking of adding more power. In my case since I did not buy a 6000DSP to start I was thinking of adding another 3000DSP using one amp per sub. ( For me it would be cheaper just to buy another 3000DSP then to try and sell mine and get a 6000DSP ). Last question if the SI HT18D4's cannot handle the 2200watts a bridged 3000DSP can deliver how are the Dayton UM18-22 as far as handling that power? Not overly concerned about it just thought I would ask. Being truthful at least for me my system is already borderline to loud.