You need a real phono preamp. Any phono preamplifier can be plugged into "line in" inputs. The rm-4 is apparently a pre-pre phono; it only brings the signal level from a moving coil cartridge up to the level that it can be used by a phono preamp. You should say what cartridge you're using for a more explicit answer. If it is a moving magnet type cartridge, you would not need the rm-4 at all.
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