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Agreed, PVC is the way to go. If you want to get hardcore with iso, then you can use 2 separate pieces of PVC pipe that don't quite touch each other, just a few mm apart inside the wall cavity, one attached to each wall. This way you don't get flanking noise transmitted between the 2 wall assemblies. If you don't have an isolated, 2-leaf wall assembly that this is probably overkill.
Once the cable is run through, I'd stuff them tight with open-celled acoustic foam, or even fiberglass or rockwool if the cable won't be disturbed much, rather than rags.
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