No deep bass or highs: VTF or VTA issue?

FWIW, I've listened to the Dynavector XV-1s through a Rhea in a friend's system. No trouble with deep bass in his setup. The sound of the XV-1s is somewhat dark to my ears, though, in the three different systems where I've heard it.
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If your XV-1s is fairly new, I would suggest running it around 2.1 grams or so for the first 100 hours or so, and keep the arm level. Mine is a few years old now. I usually run it between 1.87 and 1.93. My arm is just slightly tail up. Nick Doshi set the loading for my XV-1s at 100 ohms when he built my Alaap phonostage. This cartridge definitely does not sound dark through my system. It doesn't sound any brighter or darker than a ZYX Universe I have also heard in my system.

It was my Rhea that Swampwalker heard, or at least one of the one's he heard. It was rather bumped out in the mid-range, with the lows and highs seeming to be held back or rolled off. Noisy as well. To be fair the Rhea I owned was from the first year or so of that model.

Seems to me that you may benefit from having someone with great set-up experience go over everything with a fine tooth comb.Nick,at Audio Connection in Verona,NJ, sells and services every one of the pieces in your chain.Not very many people can boast his level of experience.

I've had the pleasure of meeting Nick and heard a TT he set up - both were wonderful. While I like learning about setup myself so I can tinker, try other cartridges, etc, I have no doubt that he'd nail it. Unfortunately I live at least 4 hours away.

I did have another setup person drop by months ago (before this cartridge) who filled up my damping reservoir (at the time I had no idea what it was for). Reading the Walker setup guide I'm wondering if I have too much fluid.

Elinor: I've used the VPI strobe disc to set the speed, but I did it right after changing the platter so I'm due to re-check it; thanks for mentioning it. I don't think my stylus is damaged.

Anyone know of a good LP to compare to digital? With the variability of mastering, I'd like to choose something that brings me closer to comparing apples to apples.

Again, thanks for all the responses.

Many good observations already.

Dan's Rhea (which he, Swampwalker and I all heard in my system) was indeed limited at the frequency extremes and that may be what you're experiencing. Two friends who've compared Aesthetix and Steelhead reported a stronger (though somewhat "steely") top end from the Manley. Tighter, less "rosey" sounding tubes might help, though I've no experience rolling tubes in a Rhea.

I agree with Dan that the XV-1S is certainly not inherently dark or rolled off. I've only heard 2 or 3 cartridges with a more open and clear top end. Question: is your stylus REALLY clean? A mucked up stylus will sound subdued or dark exactly as you described.

As Dan also suggested, you may be playing with a hair too much downforce (and perhaps antiskating too, if you're applying any). Either or both of these can smother the top end of a good LOMC. A dealer visit might help, but learning to fine tune yourself by ear is essential - unless you're going to pay the dealer to visit weekly. Cartridges at this level require regular attention to perform at their best. The link Rushton provided is very useful.

Alternatively, try setting/twisting antiskating to near zero, then take VTF down to near the mistracking point (or until bass/dynamics weaken slightly). Then bring VTF back up in TINY increments (.02g or less) until bass and dynamics are strong, but HF's haven't start rolling off. That VTF should be optimal but it may change over time or even with the weather, so you may need to adjust from time to time.

All this said, I'm afraid your table and arm are not going to provide the HF extension, speed and clarity of the highest quality digital or a top level table/arm. Not even a hotrodded HRX + JMW 12.x can do that. It's possible that making these comparisons is training your ears to recognize that. We all know where this leads, so stop comparing or be prepared to receive ever more costly advice from your fellow 'goners! ;-)