I have browsed through the archives and cannot find any conclusive views on the match between the DL103 and RB700 but have read few comments on incompability issues due to the light weight of the cartridge.
I have (and still do) use various iterations of the Denon DL103 with Rega arms, with complete success. I have 103s in RB300, RB600 and RB1000. An RB700 is no problem whatsoever.
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