Hi Namaste -
I don't want to divert this Freya-dedicated thread to a cable discussion and incur the ire of the moderators so I will try to be brief. I have found Freya sensitive (a good thing) to interconnect changes...more so than with the tubes I have tried. If you are in the US, get in touch with The Cable Company. They have a lending library (interconnects, speaker cable, digital cable) and for 10% of the cost of the cables you can audition several in your home for a few days. If you don't buy, that money will be available to you as a store credit applicable on future purchases. If you do buy, the deposit applies to the purchase price of your cable. One difficulty might be the 15 foot length you mention. I don't know if they have that length in their library.
Here is a link to their website:
https://www.thecableco.com
Here is a phone number: 1-800-328-9973
As it turns out I tried the Audience Ohno III speaker cable at the same time that I auditioned the Cardas Parsec wire. The Ohno wire did not have the fullness of "body" I was looking for (mid-range a little recessed?) I didn't like it much. The Parsec cable provided a fuller sound with good detail yet not harsh (something I'd been fighting in my system). I was impressed with the image stability and "control" the Parsec's seemed to provide. Someone might argue the Ohno III is more linear (neutral?) than the Parsec. I preferred music with the Parsec. I wish the Ohno sounded better to me as it was less expensive.
Between Gungnir MB DAC and Freya I'm using a Cardas Golden Reference XLR cable. Depending on the amp (e.g., Hegel H200), this cable can be a bit TOO warm so I'll change it out for an Audioquest Columbia.
Between Freya and amps...
With a First Watt F7 amp, there is only a single ended input to connect the pre-amp so I use a previously purchased Cardas Parsec IC between Freya and First Watt.
With another amp (Merrill Audio Taranis) connection to the pre-amp is via XLR. With this amp I am using a Harmonic Technology Pro Silway II and Golden Reference between DAC and Freya. I am experimenting with the Parsec RCA between DAC and Freya vs the Golden Reference XLR between these pieces.
I enjoy the sound of music from the system with the Cardas wire in place. Speakers are Totem Forests or Silverline Prelude Pluse speakers (change them out periodically). I also have a run of Cardas 300B Microtwin between Heed Quasar phono preamp and Freya.
Previously I'd used Morrow Audio SP4 speaker wire and various Morrow Audio ICs (MA3 & MA4). These might be good on systems that are dark or "slow sounding". I've also used Clearday Double Shotgun speaker cable. You might consider trying these. Paul Laudati is a good guy to do business with and has a (30 day?) return policy. I greatly preferred this wire over the Morrow Audio cable on the Totem Forests. The Cleardays are what the Parsec cable replaced, mainly to deal with excessive brightness from the Silverline Prelude Pluses.
This is my experience. I'm sure others will have different view about sound with the Cardas wire.
Hope it is useful.