Ok, I just sold a Delius. Have a BAT vk50se. I hear the 51se is better. Anyway, the 50se ain't bad. I am running a BAT VK75SE and Wilson wp6's. Here is my opinion. The Delius running straight to the amps at near full volume is pretty amazing. The transparency, the palpability is to die for. Everything that you like now I imagine. The 50se did help a little with depth and soundstage size-not a lot, a sutble thing for sure. A better power cord on the Delius made more of a diffence.
Now the 50se walks all over the Delius at lower listening levels. I never noticed it when I ran my Delius direct for awhile. Never could understand what everyone around here would say when those digital volume controls mess things up a little. All that transparency stays all the up/down the volume range. So, my vk50se always stayed in the chain once I had the preamp.
To me, and for my listening level preferences, the preamp makes a huge diff. Any of the 4 you mention above are great, just pick the one that best matches your amp.
XLR's cables here a must I think.
Hope that helps...
Now the 50se walks all over the Delius at lower listening levels. I never noticed it when I ran my Delius direct for awhile. Never could understand what everyone around here would say when those digital volume controls mess things up a little. All that transparency stays all the up/down the volume range. So, my vk50se always stayed in the chain once I had the preamp.
To me, and for my listening level preferences, the preamp makes a huge diff. Any of the 4 you mention above are great, just pick the one that best matches your amp.
XLR's cables here a must I think.
Hope that helps...