Replace Silver interconnect cable , please advice

It strikes me that your Cardas Clear wires are brand new... Put about 500 hours of a signal going through them... A break-in CD track or simple FM radio interstation hash will do just fine... And then reevaluate the sound... New wires can yield all sort of funny behavior that are often misdiagnosed as system problems... Lack of bass and uninvolving sound are just some of them.

G.

Did you have this problem before you installed the new speaker cables? No? Then either the speaker cables are not adequately broken-in OR they may not be compatible with your system.
All good advice above. Other suggestions, don't buy new cables yet, borrow some to see if there are any major changes/differences. If you can find an Audiodharma cable cooker run in all your current cables, especially speaker cables, to see if there is a difference.

right , they are brand new
are you sure that might be the issue?

not a DAC maybe or room acoustic or speaker standing?

the acoustic zen silver reference ii XLR should be good enough for my system?

I see 2 things you may want to look at. First is break in. Cardas takes a very long time. Second is your PC. There's a very good chance setup is not as good as it can be for audio. If you haven't already done so, try comparing a ripped CD played through your computer, to playing the actual CD in your Oppo. See how big the difference is.

I would guess it probably has to do with your speaker placement over anything else. That is really good gear you have there. Your source is probably the weak link if you have one. Acoustic Zen Silver ref is a good cable. It's not the problem at least not to the degree you are describing. Some rooms are very tough to get good sound in.

Also possibly something could be amiss with your computer setup and delivery to the DAC? Have you tried just playing CDs in the Oppo?

If you are looking for a different flavor you might try Grover Huffman cables. They are very cables and a great bargain too.