I can answer your question. I mean I can REALLY answer your question. The reason I can answer it is, I had those exact speakers, with the same amp, and did the same thing your about to do. I had a set of Ascend Acoustics Sierra Towers with Raal , matching center ( Horizon Raal) and Sierra 2 surrounds. I had a Outlaw 7500 5 channel amp @ 200 per. I updated to the ATI Signature 6005 series @ 300 per. At idle, there was no change,. But turned up, especially on music, the change was impressive. Deeper, fuller, punchier. I loved that system, but you know us guys, we can’t leave well enough alone. I now have twice that much power with Legacy’s I*V5 amp and their speakers. But I liked that Raal tweeter so much it had a lot to do with me picking Legacy’s .
And those speakers will come to life with a couple nice subs. I started out with a pair of 8 inch push pull designs by Miller Kreisel. Then stepped up to 12 inch. I don’t think I would have had even close to the sound that system produced without the help of the subs .