As always, I'll talk about definitions before giving my 2 cents. I don't believe Ra uses the term shadow self so I'm going to define shadow self, as I use the term, before talking about the subject matter. I think the shadow self is different for a polarized person than for a nonpolarized person.
I think the pre-polarized shadow self is perhaps everything the person rejects, denies, or suppresses from his conscious mind. I say perhaps because I'm not sure in the value of even defining or talking about the pre-polarized shadow self, but I think this is the definition that is commonly used by others when referring to the "shadow self", which I feel is imprecise. The type of shadow work a person can do without polarization is limited imo due to the vast amounts of distortions - some pure distortions, some STS distortions, and a few imbalanced but STO leaning distortions - that are unable to be reconciled without the compass of polarization. If you want to work with the pre-polarized shadow self, best advice is to discover your path of polarity or get a surface level quick fix by going to a nonspiritual 3d shrink.
However, once there is a choice of polarization, I think the shadow self becomes more defined. I define the post-polarization shadow self is the self of opposite polarity. It's the version of you that is STS if you are STO, or STO if you are STS. The mass of nonpolarizing unconscious distortions, which are still present, are what I call the imbalanced unconscious self. This distinction is useful, because the method of processing the imbalanced unconscious self requires balance and healing. The true opposite polarity shadow self isn't in need of healing as much as acknowledgement, acceptance, and a decision that you are firmly committed to your path while observing that the shadow version of you can give great insight into the understandings and thinking of the negative polarity. Once you cease to be bothered by the self of you that is the opposite polarity, and have truly chosen the other path of polarity, and you don't fear possession by the shadow self (fear of possession is noted by Ra as one the heart/green ray imbalances) I don't find the true shadow self doesn't come around often, and you have a much more understanding relationship with it. However, the imbalanced unconscious self is still seems to be an area of great work, primarily because of the conscious/unconscious split makes work in this area slower.
As an aside, it's not uncommon for the ego or other entites or thought-forms or even fears or strong beliefs, to manifest as a voice in your head, in my experience. So there are many different things that can speak inside our minds, and I think its not easy to necessarily figure out the source of such voices.
I think the pre-polarized shadow self is perhaps everything the person rejects, denies, or suppresses from his conscious mind. I say perhaps because I'm not sure in the value of even defining or talking about the pre-polarized shadow self, but I think this is the definition that is commonly used by others when referring to the "shadow self", which I feel is imprecise. The type of shadow work a person can do without polarization is limited imo due to the vast amounts of distortions - some pure distortions, some STS distortions, and a few imbalanced but STO leaning distortions - that are unable to be reconciled without the compass of polarization. If you want to work with the pre-polarized shadow self, best advice is to discover your path of polarity or get a surface level quick fix by going to a nonspiritual 3d shrink.
However, once there is a choice of polarization, I think the shadow self becomes more defined. I define the post-polarization shadow self is the self of opposite polarity. It's the version of you that is STS if you are STO, or STO if you are STS. The mass of nonpolarizing unconscious distortions, which are still present, are what I call the imbalanced unconscious self. This distinction is useful, because the method of processing the imbalanced unconscious self requires balance and healing. The true opposite polarity shadow self isn't in need of healing as much as acknowledgement, acceptance, and a decision that you are firmly committed to your path while observing that the shadow version of you can give great insight into the understandings and thinking of the negative polarity. Once you cease to be bothered by the self of you that is the opposite polarity, and have truly chosen the other path of polarity, and you don't fear possession by the shadow self (fear of possession is noted by Ra as one the heart/green ray imbalances) I don't find the true shadow self doesn't come around often, and you have a much more understanding relationship with it. However, the imbalanced unconscious self is still seems to be an area of great work, primarily because of the conscious/unconscious split makes work in this area slower.
As an aside, it's not uncommon for the ego or other entites or thought-forms or even fears or strong beliefs, to manifest as a voice in your head, in my experience. So there are many different things that can speak inside our minds, and I think its not easy to necessarily figure out the source of such voices.