Morrow MA3 interconnects

Try the MAC Ultimate Silver. You can have them burned in prior to recieving them. They will cost you below the $300 budget new.
I've tried just about every cable and these cables with the pure 5 nine silver is really very good.
Another good cable for bass is from a new cable maker called, Amadie cable try the Barb Masters, they also have very nice bass.
I always thought that copper cables had the best bass, but it seems high quality silver that has been soft annealed have better deep quality bass.

Equipment:
Portal Panache Int.
Arcam FMJ23 cdp
Soliloquy 5.3 Speakers

I also have the MA2's w/about 350 hours on them with exceptional bass driving Klipsch Forte 1's.

My MA3's from dac to pre are outstanding(single ended). I would contact Mike Morrow and discuss this with him. I find them to be very neutral after long break in.....

0-10 hrs sounded great, 10-90 hrs OK, 90-100 hrs constipated, 100 hrs shrill and no bass, 140 hrs marvelous. The bass depth, weight, and definition are outstanding.

I currently have only one MA3 cable between the VAC pre and the W4S amp in XLR termination. I am so impressed I have ordered more MA3's. This time I spent extra for the burn-in service. My other cables sound broken compared to the MA3.

I should receive the others next week.