So i just did a side by side test down in my Basement. Listening to Kamelot the Black Halo and Michael Jackson's off the wall (this one for the bass response this CD has) I can atest the A9's can handle there own here with music to the SDA 2's. Now i can not say anything about the A5's or A7's as i have not heard them, and i know the cabnet on the A9's has a different design then the 5's and 7's. but even without sub help on the A9's the A9's dig deep on the base side. on the Highs i would have to give a slight edge and i mean slight edge to the SDA 2's.
But if i was someone looking for a tower speaker to handle music and HT without the expense of the LSI series and the expense of powering the the LSI series to handle music and HT. I give the A9's an A+ in my book. I have been very pleased with the purchase of my HT set up. it will be with me for many years to come. i have no desire to change it up. The only thing that would change is if we moved and i had the room to have a 1080p projector.
My reveiw here is only with what experiance i have incountered the last few months as i know many of you have had many experiances with all types of gear and speakers.
The A9's Kick Ass in my book considering i paid $1000 for them from Polk even makes this purchase all the better.
Now back to moving the SDA 2's back to bedroom duty.