Will Step Up Transformer Improve the Sound Quality?

Dear @pg62  : Well,  your speakers crossover at 800hz and evev that looks that those drivers/woofers are a good design you can achieve even better quality performance levels from your room/system if you lower the inherent IMD ( Intermodulation Distortion. ) on that woofer.
Tha's mean to use your subs haddled frequencies below 80hz-90hz and at the same time that the Spatial speakers runs the frequency from 80hz-90hz and up. You will note an improvement all over the system frequency range and you can do that with an external active crossover as this one:

http://old.bryston.com/products/other/10B-SUB.html

It's worth by its high rewards to do it and you have nothing to lost. It's a very good learning audio/MUSIC experience.

Here you can read about those advantages when we add to our system subs as you already own but that you are using in different way:

https://forum.audiogon.com/discussions/do-you-think-you-need-a-subwoofer/post?postid=310058#310058


R.

Dear @pg62  : That J.Curl design is way better performer that its price can says. You own a very good phono stage that no single SUT can improve in no way against its active MC stage in the JC3+. Stay calm and with out SUT. No need to add to the delicated and very sensitive cartridge signal additional " links " that only degrades that beloved MUSIC signal.

https://www.theabsolutesound.com/articles/parasound-jc-3-phono-preamp


Btw and in reference of what @mijostyn posted about your Rel subs: are you running your speakers in full range way with the Rels added only as a low bass reinforcement?

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.