... Should I be concerned?

@insearchofprat.......Every pro amp I am familiar with ( which is many ), have input level controls, so they can be set, as mentioned above by jnorris, and also, to create level matching, in multi amp / speaker setups. Although a good volume pot might be at it’s best, at max setting, it should be fine at any other level. The Morrison ELAD is a very simply designed unit, and is more of a " straight wire with gain ", as opposed to your tubed preamp. I have not heard an ELAD in years, but I remember being involved in a preamp shootout, comparing it, to much more expensive, well known preamps, both tube and ss, and it showed less character, less sound of it’s own, compared to the others. I would try it, as it costs you nothing, as pointed out by rodman. There is nothing wrong with enjoying tubes, or any active gain stages, in your equipment chain. I like what I like, and I understand, very well, the variety of equipment available, and, the individuality, of every listener. But, when additional gain is not needed, and the stars line up between components ( gain and impedance matched ), for me, nothing like a good passive unit ( I happen to use a top Luminous Audio unit ). It is up to each individual, the sq outcome they are looking for, and without using the ELAD, you can still experiment ( Marantz into the Parasound ), as you will, as well, be using 1 less set of interconnects. Whatever YOU like best, that, is all that matters. Enjoy, stay safe and be well !

Hello,
If these are gain controls instead of volume controls you will need to reset or adjust the gains using a meter. They need to be balanced with one another. They sound like gains due to how sensitive they are. No pun intended. Be careful you don’t mess up your speakers. Please disconnect all components from your amp before adjusting anything using the meter. 

@ insearchofprat - With the Wolze; you can roll 12AU7 tubes and tailor your sound, to your heart’s content.             From what I’ve read about the Morrison; you can enjoy some wonderful transparency.     Two very nice pieces/great potential.     Have fun and happy listening!

Took advice above to heart and removed the Wolze tube line stage; now playing CD direct into Parasound power amp: lifts a veil off the music, presents a leaner, more detailed and faster (I’d say more PrAT) sound.

Comparative Tunes playing: Rapture, Sunday Girl and Atomic by Blondie; Blue Eyes Cryin in the Rain, Can I Sleep in your Arms and Remember Me by Willie Nelson; Touch of Grey, Sugar Magnolia, and Franklins Tower by the Grateful Dead; Ready to Run, Sin Wagon and Hole in My Head by The Dixie Chicks; Alison, The Angels Wanna Wear My Red Shoes, Radio Radio, and Almost Blue by Elvis Costello & the Attractions; Sinatra’s 1958 version of Come Dance With Me; All I Want, Blue, and California by Joni Mitchell; Famous Blue Raincoat and Ballad of A Runaway Horse by Jennifer Warnes; Spinning Wheel and Blues - Part ll by Blood, Sweat and Tears; Carry On Wayward Son and Point of No Return by Kansas; Moondance, Wild Night, Full Force Gale and Brown Eyed Girl by Van Morrison; and others... Changes like this, so drastic and distinct, have you pulling out stuff you haven’t heard in awhile (and being WuhanVirus quarantined gives you dedicated time...).

Again thanks to all for input... I will continue to check for input from others, as time goes by...

The only possible drawback that I saw, was having two level knobs to adjust.      The simplest, shortest path, is generally the best sounding.        When all the stars are aligned, that is.       KUDOS!