What will a preamp do for me?


Missing in the chain below is a preamp - I use the DAC to control volume.  This is my only source and will be for some time.  What could I gain by adding a preamp?

I have Thiel CS 2.3s driven by a BAT VK-55, sourced by PS Audio PW DAC, with bridge II, mostly tidal.  The DAC serves as a preamp in terms of volume control.  Mostly Audioquest cables, amp power cord is Cardas Clear m, all fed by PS Audio upc-200.

I am am hoping to improve the highs, which sometimes sound smeared, too much sibilance; would like more air and clarity.  Loud rock sounds flatter, less dynamic than I’d like.  I am not willing to give up the deep detailed and beautifully resonant mids.  Willing to spend up to $3000, used is ok.  Totally balanced is a must.  Not currently willing to entertain the idea of different speakers - my goal is to make the 2.3s sound as good as reasonably possible before moving on to other speakers.  It’s easy to find a really good preamp in this price range, so much so I am almost paralyzed by the choices.  Aesthetix , Ayre, ARC, several BAT, Parasound and more all have apparently excellent models in my price range.  Patience would put Atma-sphere and PS Audio within reach.  Which is best for my situation?  There’s no way to audition all of these, how could I avoid getting on a preamp merry-go-round?  Or should I spend my money elsewhere?
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I owned a pair of 2.3's some years back and I think your problem is the VK-55. I had a pair of modified Threshold T-50's (converted to mono blocks). They were owned by a former employee at Threshold where they did the modification and my 2.3's came to life. High current solid state is the way to go w/2.3's. I was using is w/a Audio Research SP-16.
Agree that high power ss amps are the standard choice for Thiels in general, and the 2.3s impedance curve does NOT make them an exception.  However, the BAT VK-55 sounds much better than my previous amp (Krell KAV 300-iL, 200 wpc at 8 ohm, doubling down to 4 ohm), maybe it's just the sound of tubes that I am enjoying? BAT literature suggests this amp should be capable of handling challenging loads - there's even a 2 ohm tap - that being said, I know I can do better amp wise.  But to keep the sound of tubes and switch to high current ss amp means I need a tube pre-amp, and now I am right back where I started!?! 
I'm afraid a real change in sound or dynamics demands other speakers. All the others are just adjustments to the existing sound. Thiel is a really fine speaker and I owe them a lot (still got several) but they are not the last word in anything. YMHO.
Recently I was not pleased w/my sound. Same problem music was flat at the top end. Just lacked dynamics sound was flat. My amp in my case wasn't the problem. A Bryston 2.5 SST2. It was the tube preamp. A CJ ET3 SE. Sold it for a Luxman CL 38 U-SE more on the neutral side and the whole system just kicked in. In your case maybe a Bryston preamp might be the ticket. I think an all BAT system will really kill the top end of your 2.3's. All BAT to much warmth.
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