Next Best Upgrade for Tidal MQA?

I’m trying to decide what my next best upgrade is going to be to improve my streaming music quality (predominantly Tidal, and Tidal MQA, when available).

Current setup:
Custom Deep Sea Sound 18” subs (2)
Marantz SR7012 AVR
Bluesound Node 2i
MyTek Liberty DAC
Parasound A21+

I’m wondering if I’ll get a bigger jump from inserting a Parasound JC2 BP as a pre-amp or replacing the DAC/Streamer with a MyTek Brooklyn Bridge? Or is there something else out there in the $2500-4000 range that will help make a significant jump?

Help and thoughts appreciated!

@jji666  Haha, thanks!  It seemed obvious to me that the preamp was the way to go, but wanted the benefit of the forum's collective knowledge and experience.

I think I'm down to 3 options:
(1) Brooklyn Bridge 
(2) Parasound JC2
(3) Prima Luna EVO 400

RE: the Brooklyn Bridge - this would replace my Liberty/Node 2i.  It would be the next step up as far as ESS DAC.  I am also unsure that the Node 2i can pass a 192khz MQA file through to the DAC right now - does anyone know?  I've read in places that it is limited to 96khz, so perhaps I would also benefit from the higher quality MQA unfold with the Brooklyn Bridge vs. other Preamp options?
I guess I should also add to the list the Manhattan II with Network Card, although that would be a bit of a stretch.

From digital coax or optical 
When streaming MQA content there are 3 unfolds which must occur to receive fully rendered 192khz/24-bit MQA. The first of these unfolds is handled by the BluOS app and will output up to 96khz/24-bit audio. The next 2 unfolds are handled by the internal DAC of the Node to provide 192khz/24-bit audio.
If you have an MQA certified DAC connected to your Node 2i, you can enable this MQA External DAC option to have MQA content pass through the Node 2i untouched and allow your external DAC to handle all 3 of these unfolds. 

As for upgrade.. Good preamp makes difference but not sure inbuilt dac gives best result or future potential. I would say a seperate might be more sensible choice