Hello all! I've spent the last day or two reading and re-reading old posts and web info regarding SUT's and loading but I'm nowhere near understanding well enough to know if I'm headed in the right direction. I purchased my first LOMC cart last week..a Denon 103r/output 0.25 mV. I installed the cart on my stock Thorens td 160 with tp16 tonearm. I had originally planned to use my Forte model 2 pre-amp with adjustable gain before purchasing an SUT. The pre-amp settings: GAIN: Switch 1 ON: low gain (40dB @1Khtz) suitable for the majority of moving magnet cartridges. Switch 2 ON: medium gain (50dB @1 Khtz) suitable for many high output moving coil cartridges and special low impedance moving magnet cartridges. Switch 3 ON: high gain (60 dB @1Khtz) suitable for the majority of low output moving coil cartridges. IMPEDANCE LOAD: (switches 4, 5, and 6) All three switches off: 47,000 Ohms switch 4 ON: 100 Ohms Switch 5 ON: 47 Ohms Switch 6 ON: 22 Ohms Before the cart arrived I purchased (without doing the research) a Denon AU- 300 SUT...was afraid that the pre-amps high gain setting would be insufficient. Denon AU-300 Step up ratio: 1:10 Primary impedance: 40 ohms Secondary impedance:4k ohms Load impedance: 50k ohms or more I originally read a post on the web (have since been able to find this info!) that someone had been happy with the combo...the AU-300 and the Denon 103r. I'm aware now that the SUT impedance may be better matched with the Denon 103 rather than the 103r's low output impedance of 14 ohms. But I decided to listen last night when the cart arrived. After trying all three gain settings I settled on medium gain (50db setting without SUT) and an impedance load of 47K ohms. I tried all three impedance settings..the 22/47 and 100 but the 47k was the better sounding of the three. I was not expecting this...but not sure why...I guess after trying to digest all the confusing info I've been reading I thought the 100 ohm setting would be correct.? Anyway, I guess what I'm asking...and hoping for an easy/understandable solution...did I make a mistake in purchasing this particular SUT? Should I live with it for a while...and perhaps upgrade? Or should I return and really study and understand what is needed for my set-up. Sorry for such a long post and for seeking an easy way out when I should learn on this stuff!!