I'm not familiar with your Sim unit, so I'm not sure whether my experience will be of any use to you. With Naim's Superline, which allows for a wide variety of resistive and capacitance loads, I found my best results with a 453K resistance. This particular loading turns out to be very popular among Naim Superline owners who have XX2 Mk II's and XV-1s's. As a side note, I just upgraded to the XV-1s from the XX2 Mk. II. Oh...my...god.
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I thank you all for your responses. Last night, I tried 470ohms, 100, and back down to 10ohms. 10ohms seems to work best for my equipment and temperament. Golden Imports Symphonies Nos. 1, "Nordic" and 3, Howard Hanson, sounded outstanding. I'll just stick with 10ohms for a while, it seems the best fit. There is no way to get between 10ohms and 100ohms, by the way.
Thanks to all,
There is no way to get between 10ohms and 100ohms, by the way.Yes there is. Use some RCA "Y" adapters and plug some DIY RCA plugs wired with various resistor values into the extra female connector on each "Y" adapter. Use a 100 ohm starting value on your phono preamp. The total resistance will be lowered according to the value RCA plugs you install. Use this parallel resistance calculator to figure the new resistance. For example, using a base resistance of 100 ohms, plugging a RCA plug wired with a 50 ohm resistor will yield a resistance of 33 ohms.
Thanks to member "Nsgarch" for this technique.
I've tried raising and lowering the VTA, and have settled on about parallel, or a tad down in the back. I really didn't notice that much difference, though, so I quit messing with it. Lowering the resistive loading seemed to make much more difference, and it sounds so good now, I don't dare change it. I do like to tweak though, so I've got to resist the temptataion.
Regards, and good listening,
For speakers I'm using Dynaudio Contour 5.4's. I don't honestly know if this makes a difference, but I am using a passive pre, a Sonic Euphoria, that may have something to do with my loading preference. Music sounds more of a neutral frequency balance at 10ohms. When set higher, it reminds me of old receivers with the loudness contour on, not balanced, or neutral. I am enjoying the way vinyl sounds right now more than at any time in my 40+ years in this hobby. It works for me.
I too have the XX2 Mk II and have the loading set at 40 Ohms. Ralph Karsten (Atamasphere) provided a technical method of determining the loading using a function generator and an oscilloscope, and I found that with the loading set below 30 ohms, the signal began to be attenuated. Do you experience a drop in volume at that level?