On the Rowland Synergy IIi, increasing the gain and decreasing the output volume by a similar amount causes a noticwable improvement in dynamics.
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the best budget preamp in that issue is mccormack micro line drive that has three active modes of operation 0dB, 6dB and 12 dB of gain and completely passive where you can use it with no power supply.
i did not research a tube preamps on that issue but everything is possible there since even for small signals you can use switchable to tetrode operation thus increasing the gain or decreasing back to triode...
The pass labs x1 can set hi OR Lo mode gain on a per-input basis. A great feature.
The pass labs aleph P has per channel variable gain as does the BAT vk-5i. I found that the BAT sounded best with the gain set to MAX. Brought out the tube sound the most. The aleph P sounded best with the gain set to around 11 oclock. The feature is quite useful - especially since different people have different tastes. Some like the transparency of a more passive pre, some like more dynamic drive.
I have a tubed Supratek Syrah pre and also prefer it at max gain. It has 5 different gain settings so you can try different settings to work with your amp. I have a few cd's that seem to have been recorded on the lean or bright side and lowering the gain (and raising the volume) helps.