NO Line Stage (Preamplifier) is absolutely 100% transparent. My Audio Research:
http://www.usaudiomart.com/details/649353546-audio-research-ls2b-mkii-line-stere...The LS-2B MkII & the LS-16, are the last of the great Class A outputs using 6922 tube variants, the most transparent and truly high definition, you will ever hear. They are like chickens teeth on the used market, but do come up here and there. Cult Status they have secretly and not so secretly achieved. These two models absolutely trash out the 6H30 tube, Audio Research now uses. So, no need for a ZTPRE for me.
I put in the LS-2B and turn my ZMA into a whole other Beast. However, as stated, for absolute purity.....ZDSD to ZMA, for me, most of the time.
However, I could get another pair of IC's (KS1030's only will do-to my all copper KS6063) and run the ZR2 between my Line Stage and ZMA....and the ZR2 will do its thing. I just don't want to do it that way.....I wanted it direct. It should have been made clear to only use with an Preamplifier.
I'm all set....and my set up, Kabling and NOS Platinum tube rolling can't be beat. I could never go back to low power/I have decided and certainly could never go back to lamp cord Speaker wire that most use. 95db sensitivity @ 1 watt/1 meter ......I find horrid too. I have stated this before. .....why I sold my Monoliths....the Tweeter and that driver...my Adagio Tweeter's and Driver's absolutely crushed.
Each to their own. Enjoying the music for your ear brain connection...is all that matters.