Does Everyone Use 2 Phono Cables with SUT

If you mean 2 phono cables as opposed to 1 phono cable into SUT and one "regular" interconnect out of SUT, then yes. The cable coming out of SUT is possibly even more important. Many line-level audiophile interconnects have far too high capacitance to work well in this role (SUTs don't like capacitive loads) - large gauge wires, over-the-top of shielding, braided geometries. Phono cables are optimized for lowest capacitance, so they work well with a SUT. Most Cardas interconnects also tend to have EXCEEDINGLY low capacitance, and are excellent in this role. You'll also want to keep this run as short as possible, under 1m, because capacitance is directly proportional to length

I've tried premium cables like a 1m Audioquest Fire or 1m Sky out of a SUT - it worked, but didn't sound as good as lower capacitance, shorter runs. The coloration effects of each cable became extremely apparent out of a SUT. Audioquest makes phono cables specifically optimized for low capacitance (Cougar, Leopard, Wild LP, WEL LP), and you should use these over their normal IC line. Leopard is quite good without getting into crazy pricing. Of course the AQ Fires and Skys sounded great between amp & preamp (where they belong). 

The Bob's Devices SUT cables are also very good for the money, and they're based on Cardas ingredients.

Mulveling you are spot on. I was using a phono cable “to” the SUT and a “regular” interconnect from SUT to phono preamp. I have a Miyajima Madake cartridge (.23mV output) and the signal was literally getting lost. 
 

I recently added 2 Audience Front Row “phono” cables and everything snapped into place. I thought perhaps my speakers were not efficient enough. I almost headed down the path to replace my speakers! 
 

Lesson learned. 

Huh?

that cartridge has a difficult combo of high 16 ohm impedance and low .23mv signal.

It is the type that might need a SUT with individual gain adjustments and individual impedance

what SUT are you using? You need to know the x factor of it’s input(s).

cartridge .23mv; allowing for some loss: an x factor around 20: that would give you a signal of around 4.0mv., plenty for a MM Phono input.

resultant impedance of xfsq 400 shown to a 47k mm phono input would be 117.

guidance for your cartridge, 16 ohm x 10 = goal of near 160 ohms shown to MM Phono input..

to get ’shown’ impedance up, you need to lower the x factor.

x factor 18 signal after bit of loss 4.0mv, still plenty

xfsq now only 324, 47k/324: shown impedance now 145. closer

x factor 16, signal say 3.5mv, many MM and High MC have this or a bit less. your MM stage has a ’sensitivity’, that is just above too low.

xf16, xfsq 256; now ’shown to 47k input would be 183.

now back to the issue of cable loss!

And here I thought that phono cables WERE interconnects.

The post reads to me:

"Better SQ from better cables."

BFD

No clue what everybody or anybody else has any bearing.

Definitely makes a difference to use a “true” phono cable from SUT to phono pre. Also most phono interconnects come with a grounding cable, some installations may require this some may not, every situation is unique. With my own set-up my Kuzma 4Point comes with RCA cables at the back end and then connect directly to the catridge pins, which is still like using a dedicated phono cable from arm to SUT.