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I'm currently running an Audio Note TT2 with Arm 3 and Ortofon Rondo Red through a Croft ECC88 based step-up (fitted with Siemens Halske E88cc) and Croft RIAA. The result is both refined and dynamic, but I'd be keen to get a bit more midrange magic and wouldn't mind giving up a bit of the polished presentation in the process. The latter is a typical sound signature of Ortofon, although it's much less prominent in the Rondo than in the MC30 supreme, which I've previously owned. I'm thinking I could either go all in and purchase an Ortofon SPU Royal N, or I could go for a cartridge with just a slightly more organic sound than the Rondo Red and exchange my active Croft step-up with a passive transformer. From what I understand, a SUT, when properly matched with the cartridge, offers better midrange than an active step-up. But getting the right cartridge and the right SUT may be quite an endeavour and I'd be restricted by the SUT, should I feel like trying another cartridge later on. As midrange magic is what I'm after, going directly for the SPU is tempting, and I presume I could think about purchasing a SUT later, if I feel like it. But is the RB300 based Arm 3 suited for the heavy SPU? The theoretical resonance frequency comes out at 11.4 Hz based on the following numbers: RB300 effective mass: 11.5g. SPU Royal N weight 13g. Combined: 24.5g. Cartridge compliance: 8 µm. From what I understand, this is pretty much ideal. But although the RB300 and the SPU are both very popular, I haven't found anyone actually combining the two. Any thoughts?