Powering Infinity Prelude MTS

Hi

Im jumping on this thread because its hard to find other Prelude MTS owners. I've never likes the sound of the preludes and was hoping for your feedback...

My two primary complaints are:
1) high-end is very bright
2) difficult to optimally place towers when on subs as subs perform better in different locations.

I listen and measure frequency response with REW (mic and frequency sweeps that show frequency and time domain measurements, often used for room correction and/or digital x/o).

My related components are: "audiophile" pc Jriver MC playing redbook, 24/192 and DSD files -> firewire -> Mytek 8x192 m-ch Pro DAC -> Lexicon MC12 in analog bypass mode (to only use volume control) -> Theta Dreadnought m-ch amp

Do any of you share my feeling of overly bright and imperfect integration of sub with tower?

Thanks in advance!!

FYI...

1) I agree that all signals to the sub use the sub amp

2) I've deciphered the switch positions one the sub (1, 2, 3) and what they do in various configs (basically pass speaker signal (vs line) or not; filter frequency response to sub or not (set high frequency limit, i.e x/o or none)

3) Im still testing line vs speaker connection to sub, but will likely use line, si I can bypass internal x/o in tower and sub and drive as 4 speakers using digital x/o to flatten frequency response (remove brightness and adjust for room nodes)

...Just trying to be helpful