I do not have experience with the 1075. I have used 2 rotel 1090s to biamp my ascent i's. I have also used the rotel 1080 on the ascet i's. The 1080 was too bright for my liking. The 2 1090s sounded much better but were still just a little bright for my liking. I am now biamping the ascents with a 1090 on the woofers and a Jolida 1000A tube integrated on the panels and I love it.