Can I use a SUT or head amp with my 60dB Coph Nia MC phono preamp?

It’s defintely a lack of gain issue between the .4mV Denon and the 60dB Coph Nia, when used with the passive pre. The amp I’m using is a First Pass J2. I have plenty of gain with the passive pre when I use my DAC/CDP combo, it’s just a phono stage issue. It’s not that it won’t get loud, as I can get to about 91dB-93dB at my listening position at full throttle. But that’s just not enough with some recordings (think Zeppelin or Floyd). In most cases it’s fine, albeit I have to turn the volume knobs (it’s a dual mono passive) up quite a way.

I should’ve left off the SUT comment, as I pretty much knew I wouldn’t be able to go that route. I was more curious about a head amp with adjustable gain, since some of those can go down to a 10dB or so gain.

Lewm, I'm driving Klipsch Cornwalls.  My listening position is about 9 feet back.  Line I said before, I can get to the low 90's, which is typically fine.  But I'd like to have more in reserve when I need it.  I'll probably just replace the Coph Nia at some point.  There are a lot more cartridge choices in the .3-.5mV range than in the 1mV range, and I don't really want to be limited by that.  If I had a phono stage that had 66dB - 70dB (or a little more) of gain I'm sure I'd be fine.  I know there are some quality dual mono designs (which the Coph Nia is) out there that get into higher gains like that.