There's a moment in every serious system build where you've done everything right — the amp, the source, the speakers — and something still isn't clicking. The image feels soft. The low end is there but not tight. The top end has detail but it's smeared around the edges. Nine times out of ten, the cables are confessing to sins you didn't know they were committing.
Nordost introduced the Valhalla 2 series in 2013 as the successor to the original Valhalla, which had been quietly embarrassing expensive interconnects since 2000. The update wasn't a rebrand. They revised the conductor geometry, moved to a new fluorinated ethylene propylene (FEP) dielectric, and tightened the micro-mono-filament construction that keeps the conductor suspended in air rather than pressed against insulation. Air is the best dielectric. Less dielectric means less time-smear. That's the whole philosophy, and Nordost has been more committed to it than almost anyone else in the business.
The XLR version of the Valhalla 2 is where this cable really earns its keep. Balanced connections reject common-mode noise at the circuit level, and when you pair that with conductors that are genuinely not slowing down the signal, you get an interconnect that feels less like a component and more like an absence. That sounds like marketing copy. It isn't. There is a real, audible difference between a cable that adds character and one that refuses to.
What It Actually Does to the Sound
The Valhalla 2 XLR doesn't warm things up. It doesn't add body. If your source is cold or your amp is analytical, these cables will not fix that for you. What they do is let whatever is actually happening in your electronics happen with less interference. Bass lines separate from the low midrange in a way that cheaper cables muddy together. High-frequency detail — cymbals, sibilance, the breath of a vocalist — arrives without that thin, glassy edge that lesser cables sometimes introduce.
Put it between a well-sorted CD transport or a good DAC and a preamp with real resolution, and you start hearing the preamp doing its actual job. The 400xi's gain stage — which has more transparency than people give it credit for — benefits exactly from this kind of cabling. You're not adding something. You're removing something that was always in the way.
The honest caveat is this: at $800 to $1,200 used, you are paying a significant amount of money for wire. There are perfectly good cables at a tenth the price. The law of diminishing returns is steep here and doesn't care about your feelings. If your system isn't already sorted — if there are upstream problems with your source or downstream problems with your speakers — these cables will not solve them, and you'll convince yourself they didn't work and sell them at a loss. Get your system right first. Then buy the Valhalla 2.
The other thing worth knowing is that Nordost cables are fragile-ish in handling. The thin conductors and air-spaced geometry mean you don't want to kink them, route them in tight bends, or bundle them against power cables. They want to be treated gently and routed with some space around them. That's not a dealbreaker, but it's a real-world consideration when your rack looks like mine does.
Used, these regularly show up in the $900 range for a one-meter pair, which is still a lot of money. But the original Valhalla retailed for $2,000 a meter, and the Valhalla 2 was dearer than that. The secondary market on Nordost is actually pretty healthy because these cables last and don't degrade the way some other high-end cables do.
If your system is at the point where you're wondering what's left to improve, these might be the answer. And if you find yourself wondering why the music just sounds more like music — that's the cable disappearing exactly the way it's supposed to.