recommendation for rca interconnect for deeper bass for dac to preamp

I agree 100%. Tone controls are for tone control. 

I also use Blue Jeans Cables LC-1 for my 2 rigs, almost all ICs. SCs also (canare). Moved to BJ the last few months, as they're so neutral (and absurdly cheap).

+1 tgrisham and raysmtb1! Sane and levelheaded advice! I have reached the same conclusion that all wire sounds the same! If it passes a signal it is fine, regardless of price! 

https://www.ebay.com/itm/New-GOLD-OIL-Filled-TUBE-Amplifier-Analog-Speaker-Bass-RCA-CD-Player-CABLE-...


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I kid you not!!!! 1K? LOL 39.00 it will blow your mind, did mine..

Do they work? You tell me.

I’ve used them, I’ve made them, and I still use them..

Yea all cable sounds the same...That is pretty funny.. 

Regards

I don't think that the OP wants to use cables as tone controls, he simply wants to hear everything there is to hear, including bass.
Now, in a reasonably good system and with reasonably good hearing, cables do not sound the same, though some do sound similarly.
I have Purist Neptune, Wywires Platinum and Tchernov Reference MKII RCAs. The Wywires and Tchernov are not far from each other but still there are clear differences. The Neptune is different. All three give excellent bass and PRAT without artificial exaggeration.
You won't find Neptune or Tchernov used, Wywires sometimes does show up for about $750 RCAs 1 meter pair. either on Audiogon or on usaudiomart.com. Kubala-Sosna is another brand to consider, but I have no personal experience with it, though I trust people I talked to who use them. It's sound signature is closer to Purist, as I understand, even if not necessarily to Neptune model.
You might also consider new Purist Aqueous Luminist, $1200 retail, but I have not heard it.
Overall, of what I know my realistic choice would be Wywires Platinum. It sounds great in my all analogue set-up and it sounded excellent when I tried it with the Burson DAC in my computer based system.