I purchased one for my P5 and felt there was an definite improvement in the bass. Not dramatic but, there none the less. Oval I would say a #5 on a scale of 1 to 10 for an upgrade.
Just put on a new "white" belt 3 days ago on my P5 to replace a 3-year old belt. The entire rig sounds very noticeably better after running in a couple of hours: sound image is more solid overall, detail retrieval is better, musicality has been stunning! It may be that my old belt was tired, but I'd suggest trying the off-white belt as it's done wonders for me.
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