Hello, yes they are Totem Winds and they do play quite deep but the sub does put out more bass. They bass is similar on certain music tracks with and without the sub but how I can tell that the bass is heavier with the subs is the rattling of the pictures behind me. Of course if I listen carefully, the Direct (sub on) setting is heavier in the bass than the Pure Direct (sub off). But it is similar. At higher volumes, the Totems start farting out of the back port and this tells me that the woofers are being over driven in the Winds... I guess this is why it is wise to have a sub. \n\nIt is indeed an AVR - Pioneer Elite SC27. This is how I am controlling the crossover setting. The MC model is the MC302. \n\nI am familiar with the crawl and I did do it. It sounds best in the left corner. I didn't place the sub on the couch but rather moved the couch and moved the sub into the listening position and then crawled. The question about sub placement was more about is it ok to place it behind the speaker (i.e. will speaker that is in front impede the performance of the sub. I am thinking not. \n\n\nDeciding on a sub-to-speaker crossover frequency is best done by trial & error. What are your speakers, and what is their low roll-off frequency? Are they Totem Winds? They are rated to go as low as 24 Hz. If so, I think 100 Hz might be too high.\n\n\nI'd try 60 or 80 Hz as a starting point and go lower until you think you hear a gap between the speakers and the sub woofer. Also try listening with both the sub and your speakers run full range. It isn't always easy to tell, so give it time.\n\nHow are you controlling this crossover? In your photo, I see a large MacIntosh (?) amp, but your sub woofer prevents me from seeing what could be an AVR.\nThere is no generally correct or incorrect answer to sub woofer placement. Place it where ever it seems to work best in your room – within practical limits.\n\nSee the AH link that discusses how to go about this, Crawling for Bass – Subwoofer Placement Tips.