Hi bullitt5094,
I believe that anywhere from 5 to 10 watts driving the DI's would be fine in a HT LR Mains setup. My room has 30 foot ceilings, is 28 feet wide, and 40 feet in depth and I have no problem with volume levels or dynamics on all types of music with 5 watts. I have always used a pair of sub-woofers in my room crossed over at 30 at very low volume levels not for bass extension or reinforcement, but for ambient cues that fill out the depth/width of the sound-stage created in my room. Since I drive this pair directly from the Micro-ZOTL I'll often shut off the amp to show what the subs are really adding to my listeners and they often laugh at how little they really are adding, yet if I turn them off the sound-stage flattens out and loses its 3D perspective. This also means that the DI's being driven with 5 watts is producing the low end grunt on its own when the music contains this type of bass frequencies.
I believe that anywhere from 5 to 10 watts driving the DI's would be fine in a HT LR Mains setup. My room has 30 foot ceilings, is 28 feet wide, and 40 feet in depth and I have no problem with volume levels or dynamics on all types of music with 5 watts. I have always used a pair of sub-woofers in my room crossed over at 30 at very low volume levels not for bass extension or reinforcement, but for ambient cues that fill out the depth/width of the sound-stage created in my room. Since I drive this pair directly from the Micro-ZOTL I'll often shut off the amp to show what the subs are really adding to my listeners and they often laugh at how little they really are adding, yet if I turn them off the sound-stage flattens out and loses its 3D perspective. This also means that the DI's being driven with 5 watts is producing the low end grunt on its own when the music contains this type of bass frequencies.