IMHO, Valhalla interconnects would bring additional detail, and possibly brightness (but that would depend on your source, if it is bright, the Valhalla would let it shine on through). They are an extremely detailed interconnect. (In fact I think they are ruthlessly revealing of any inferior electronics in your system.) That being said, your Halcro electronics are extremely high end, and therefore, going with the Valhalla cables would probably be an improvement over the Golden Reference cables, .... unless you don't want more detail. :-) (Which is exactly what you said you don't want!) Personally, having had the Golden Reference cables in my system, and now the Nordost Quattro Fil cables (Nordost's previous best cable before the Valhallas), I prefer the additional detail of the Nordost cables, versus the slight amount of warmth of the Golden Reference cables. (However, I do think highly of the Golden Reference cables, so it is not like they are a mediocre cable.) And, I should point out that I do use a cable with a slight amount of warmth as my speaker cables, (Audience AU24) just to balance out the system's sound.
If you are considering changing cables, I would look into the Jena Labs cables. They are very detailed, but they are not ruthlessly revealing like the Valhallas (as per a friend who has been experimenting with both), but according to him, they are slightly more musical. FYI, he ended up with the Jena Labs interconnect from his preamp to his amp, and Valhalla speaker cables. (He felt that going with both of either one, tipped the scale too much to either side of "not quite enough detail, but very musical" or "very revealing, but not musical enough". He feels that one of each works just right. (Both Jena Labs and Valhalla cables are both (almost) obscenely expensive, but since you own Halco equipment, that should not be an obstacle to you.)
My two cents worth.
Please realize that I am merely passing on his opinions regarding the differences between the Jena Labs and the Valhalla cables, so take that with as many grains of salt as you like! (I love the sound of his system, so I will state that whatever choices he has made has worked out incredibly well.)
Good Luck in your search!
If you are considering changing cables, I would look into the Jena Labs cables. They are very detailed, but they are not ruthlessly revealing like the Valhallas (as per a friend who has been experimenting with both), but according to him, they are slightly more musical. FYI, he ended up with the Jena Labs interconnect from his preamp to his amp, and Valhalla speaker cables. (He felt that going with both of either one, tipped the scale too much to either side of "not quite enough detail, but very musical" or "very revealing, but not musical enough". He feels that one of each works just right. (Both Jena Labs and Valhalla cables are both (almost) obscenely expensive, but since you own Halco equipment, that should not be an obstacle to you.)
My two cents worth.
Please realize that I am merely passing on his opinions regarding the differences between the Jena Labs and the Valhalla cables, so take that with as many grains of salt as you like! (I love the sound of his system, so I will state that whatever choices he has made has worked out incredibly well.)
Good Luck in your search!