How can I improve cableTV audio?

Yup Reubent nailed it. The best thing is to get an older box where the output is 44.1 or 48----Then hook that to a 2ch dac.----I have 2 direct boxes--one each. (DD and 48hrtz)

If it's not digital cable you might try routing your cable through a HiFi VCR and connecting the audio from that to your stereo. You'd need to use your VCR remote to change channels.

While you can route the audio through a vcr---that method isn't any better than just using the box's analog straight to a 2ch pre. The goods are there--you just need to keep it digital--to a quaity 2 ch. dac. This refers to the older non DD / but still has a digital out, box. The setup I have will challenge many cd systems. (I use the Audiomecca Enkianthus dac.)

Any idea where I can find a non DD (that stands for Dolby Digital?) cable box? How does that work... I run the raw cable into this box, and then run digital out to my DAC, and another Coax to the TV?

What you would be looking for is an older box. The rf screw connector cable goes into the cable box,as usual.(Cable-in) Then out of the box you run a coax to a 2ch dac. Years ago most cable company boxes had a coax-out. In fact I go back to the dmx radio;from my cable co.---I think thier present boxes do DD for the movie stations(hbo etc) and 48 for the music stations.---(48 is a 2ch. digital format) This is how it was 2/3 years back and I don't know how it works today. To repeat; the goods are in there.