I use to sell Audio Pro and Quad in the 80s. I have several sets of subs now including REL. IF your speakers actually go down that far flat I doubt if you would hear a big difference on most music. I don't really know the Tyler line well, I loaned a pair of large Hsu subs to someone with Tyler's; not sure of the model. They had a supposed list of $10,000 and weighed almost 200 lb. In this case the subs made a considerable difference and he ended up buying a sub. The 113 will generate much more bass than the Audio Pro; the question is whether you want or need it. With my Spendor S 100s or GamuT L5 I don't use subs most of the time; I don't find it necessary and I am somewhat of a bass freak. Long story short, the Fathom will give you more bass; if you think the Audio Pro is helping now then you should probably get it. I am not sure that Tyler's have the frequency range they claim; if they did I don't think the AP would be making any difference.
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