Advice for RCA Interconnect Upgrade?

I like TWL on digital components, especially their power cords. IME your smallish room is your biggest problem. I've got the same problem. Think about trying DSP and experimenting with cheap homemade room treatments. Google AMROC to put in your room dimensions and see your room modes. BTW I'm a Michigander too:-)

@lrlacosse "However, the change did not calm down that frequency bump in the 4-5k range.".

Yep, if you changed the crossover and/or crossover point, quote "Using an app on my iphone, the response has peak db from 4k to 5k", ...a new pair of interconnects is not going to fix that problem. An app on an iPhone aint gonna cut it for designing a proper crossover for any SVS speaker. Yes, there are helpful engineers at SVS, just like everywhere else - and if you are nice they might send you proper crossovers to restore your speakers to operate properly again.  

Don’t go crazy, there only cables.

having some silver in the wire does boost the highs and sparkle a wee bit, compared to just above average cabling 

those Groneberg rca’s are quite nice, as well. 
 

I now use average Belden shielded rca ‘s from amp to preamp, they remedied the radio station tower 1.5 miles from my house, where as the audioquest did not. 
 

 There are a lot of 10$ words for cables, don’t get sucked in to spending too much $

try those Groneberg rca’s, they are shielded very well' and are a good snuggish fit on the pre and amp. 
 

I like those cables, I also like my audioquest balanced pair. Haven’t used in a while. 
 

anyway, get those cables home and use one on right Ch one on the left ch. , and switch back and forth for audible differences. 
 

enjoy the auditions