Originally Posted by ds-
I'm not sure if I should order Low gain or Regular gain.
Will be using it with the V-moda Vibes most of the time. Though I do have a HD600 if that makes any difference.
I have two V5's, one in low-gain and one in standard-gain. Assuming my experience there carries over to the V6 (and it should), here's what I can tell you.
There's a lot of overlap in their ranges. Either one should work, giving you adequate volume (and control of volume) at "normal" listening volumes. The difference lies at the extremes.
With the low-gain amp I can listen to an HD580 at any volume I'd care to, and I get finer control of volume when listening to an IEM at ultra-low levels (say, if I'm wearing an ER-6 while taking a nap). I'd expect the experience with HD600 and Vibes to parallel that pretty well.
With the standard-gain amp it's harder for me to get the volume "just right" when I want to listen ultra-softly (and that's why I bought the low-gain amp). But if I were listening on the HD580 to something with a low recording level - for example classical with huge dynamic changes between the pianissimo and fortissimo sections - then I'd need the standard-gain amp if I wanted to bring the softest parts up to a more audible volume.
I've found for my purposes that the low-gain amp serves all my needs well enough that I don't actually use the standard-gain amp these days, though I keep it around just in case. But if you listen to softly-recorded material on the HD600 or if you sometimes want to crank it extra loud, the standard-gain amp will suit you better. But another way to look at it would be that the standard-gain amp is suitable for pretty much anybody who doesn't have really-really soft listening, or very-sensitive IEMs on their agenda.