Even with several inputs, the SUT normally works only with one. Or you have a SUT with an input selector.
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If you care about optimum performance then SUT/cartridge matching is critical. Using a single SUT with different LOMC's is a serious compromise unless you change resistors every time. It's certainly do-able, I used to do it, but it's inconvenient and even with resistor swapping the gain ratio may not be right if your cartridges have very different output levels.
An SUT with multiple inputs would need switchable resistors on each input and perhaps seperate windings for each input (again, depending on the ouput levels of your cartridges). I don't know if the Luxman (or any SUT) provides that flexibility, but without it all you'd gain over a single SUT is convenience - the performance of most LOMC's would be compromised.
The easiest solution is an active MC phono stage with:
- switchable impedance (important, though less critical than with SUT's),
- multiple inputs (a convenience, not a necessity)
- adjustable gain (likewise).
Quite a few phono stages meet these criteria, at various performance and price levels.