I've heard great things about the SVS towers and the Sierra 2, so you have two very fine speaker systems.
Thanks for the compliment on my humble rig. I use a very elaborate cable management system. LOL
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If I keep it clean looking hopefully the lady of the house will not balk at the idea of a second subwoofer. If I could have a totally separate music/movie room, mine would look like a bat cave as well.
I really like the Sierra Towers. Very clean sounding from top to bottom. No particular frequency range stands out. I would not call them bright by nature unless the source material is bright. Clean and clear through the mid-range. Bass is good as well. Obviously with two 6 inch bass drivers in each speaker, they do need a sub, or two. The Horizon center is just killer. Dialogue is really super clear. I had Dave at Ascend build me a custom center. It cost more, but it fits in the rack perfectly.
I normally use 3 listening modes: 1. Pure Direct (No eq, no sub, just a direct signal with no processing) 2. Straight (This is 2.1, so the sub is on of course) and 3. Dolby Surround (5.1 in my case) they all sound good. Going back and forth between Pure Direct and the other modes, you can really hear how the sub fills in the bottom end. I have run room Eq (YPAO) and general prefer the "Through" mode which is no Eq. Sometimes I do use the "Natural" mode (YPAO on) the other sounds modes are just rubbish IMO.
You are more than welcome to take a road trip to Tuscon to listen to the towers. And yes, we are social distancing....sigh