RCA vs XLR which would say is the BEST?????


Here is the system:
1. Merlin TSM-M (right/center/left)
2. Axiom QS 8 rear channels (right/left)
3. (2) Earthquake Supernovas MKIV
4. Satori Shotgun Bi-Wire Speaker Cable (right/center/left)
5. Arcam DV 27 (no xlr connection only coax/optical/analog)
6. Bryston SP-1 Pre/Pro (coming with XLR connections)
7. Bryston 9BST amp (coming with XLR connections)

Now I need to connect the SP-1 to the 9BST so do I use RCAs or XLRs? I can do the in either .5 or 1 meter. I have enough RCAs to do the job now and I would have to buy the XLRs. I only want to do this once (right how many times have I said that in this hobby) so your advice will be welcomed. Which should it be?????
hammerfilms
Having read all the posts above and found nothing to contend with, I would consider Zaike's post the most reasonable., simply because there is no objective "BEST" . Your ears will have to decide....just my 2cents ..Cheers,
Question?????????????

Can this be done, shouldn't be done, or you can but it will sound like #%$@!!!??

Seeing that I have five speakers (Left/center/right/ and two rears) and only three single xlrs (at this time) can I run the left/center/right in balance mode and the two rears with rcas in an unbalanced mode? Or is this one of those either or things? I truly want to do this right and it looks that the xlr way is the one. What do you think?
Well a potential problem doing this is XLR's do indeed generally produce a 3db gain over RCA's , so you may find yourself in a situation where the fronts over power the rears. Of course adjustments can be made on your preamp, but that can be a little tricky. I use an all balanced system so I know the benefit of XLR cables , but in your case, my guess is they are not necessary. However that being said, you will always wonder what your fronts sound like with XLR's , so see if you can borrow some. In some systems XLR's are provided, but only as a marketing ploy.
Many Rotel owners, for example, prefer there amps hooked up single ended.
In your current set up, unless your interconnects are above 2m length or more, XLR will absolutely do nothing good to your system. In fact, RCA should be a good choice.

However if your system is fully balanced i.e your preamp, cd player, amp are truly balanced design then XLR would be the only choice. The bryston combo you have does provide balance output but they are not fully balanced design nor your Arcam player.
I have a pre-amp that is truly balanced (Bat vk5i) and an amp that has XLR imput but not truly balanced (Bel Canto 200.2). I'm currently running RCA between the two (with adapter on pre-amp). I'm curious whether my system will benefit from running XLR cable instead.