"the following subwoofers and which would you choose and why"
Of your choices, I would select the B&W 855. I know from personal experience how well the ASW 850 integrates with my system. This sub can go really deep and is easy to setup. I have heard many recommendations for the F112 or F113, but have nor heard them.
Of your choices, I would select the B&W 855. I know from personal experience how well the ASW 850 integrates with my system. This sub can go really deep and is easy to setup. I have heard many recommendations for the F112 or F113, but have nor heard them.