Lenght of wire has NO effect on SQ - contrary to what the delusional will tell you! For speakers 12 or 14 awg is fine. Having equal lengths of PC's is NOT important! Don't waste your money on power "conditioners". There is NOTHING wrong with the AC from your outlets!
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Speaker cables should ideally be as short as practical, as excessive length causes power loss due to the relatively heavy current running through them. With dual monoblock amplifiers, you can probably place them a couple feet to the side of each speaker, to help minimize influence of direct sound waves. Use 12AWG speaker cables 3 to 4 feet long, and you should have no problems with power loss or reduction in effective damping factor of your amplifiers.
Connect the amplifiers to the preamp with balanced, shielded XLR cables, which have excellent common-mode noise rejection characteristics.
Power cables need be no heavier than #14AWG at the most to not become a weak link in the power delivery chain. Nothing special is needed, ordinary SJT extension cord wire is all.
Thanks all! I want to replace all standard power cables with upgrades. Price is a consideration and I’m new to this. Are power cables analog or digital? I have PS Audio Directstream Jr DAC and Perfectwave transport, Audio Research AR17 pre, and Krell MDA-300 monoblock power. Will one brand suit all or are there quirks about each that require individual considerations? I already have BetterCable XLR interconnects on all but the 18’ run I will need for pre to power amps.
There is NOTHING wrong with the AC from your outlets!You sound pretty emphatic - given the ALLCAPS and exclamation mark. So I'll ask you: How do you know anything about the power from his outlets unless you've measured it?