The SUT suggested above should be a very good match for your DL-103, as it has selectable loading between 50 and 100 Ohms, the recommended load for the Denon being 100 Ohms.
The only caveat: any hum/noise present will also be multiplied, along with your music.
Well worth the low entry fee, to pursue as an experiment, in your system.
On the other hand: the Hana EH cart sports 2.0mV output (available for under $500) and should easily (arguably/according to your tastes) outperform your current Empire MM, providing the rest of your system has the gain to sate any SPL hunger (Empire=4.5 vs Hana 2.0mV).
Isn't this game fun?
https://www.audioadvisor.com/prodinfo.asp?number=HAE