Audioquest silver extreme interconnects

I bought two pair of these for the analog side of my system, and feel like the chesire cat. The conductor was one of AQ two top conductors before they came out with the dbs series. when the conductor was discontinued, hcn bought what was then a surplus by the bulk spool; i. e. cheap. After several years, they are simply trying to get rid of the stock, and it is a real bargain. Performance wise it compares to the Colorado. I'm not too proud to buy bargain stuff and laugh at the savings. I have put together a $30k rig for about
$12k outlay by getting a "short list" and a wish list and waiting for demos, open box, inventory clearout, etc. Spend more money if you want, but my analog side came to life with these interconnects.

Which conductor was it? Lapis ?

Many Audioquest cables from Hong Kong on ebay.
Are they authentic?

I ordered a 2m set of these- and will be adding eichmann bullet plugs to the ends in place of the connector that arrives with the cable. If they sound okay- I'll do a decent comparison with the current Colombia interconnects from RCA.

What is the bass performance from these? I ask because I know some cables, especially budget ones, that perform well on the highs tend to be weak on the low end.