Yes, it helps that you are out in the country and have a step down transformer dedicated to your house. It will act like an isolation transformer. Being far from city or industry is good.
It is also great that you have a circuit separate from the rest of the house (sans jacuzzi). This is equivalent to a separate subpanel and you can control whether the jacuzzi is on while you are listening. It is good that you have the top breaker and that only a few lights are on the circuit besides your stereo. Is this circuit a 3 wire (hot, common and ground)? If so, you are very close to a dedicated situation.
Are you having any problems with ground loop hum? Do light dim when appliances come on in other parts of the house? Is there objectionable background hiss? If not, what makes you think you need to go further? I would leave it alone for another year until you move.
It is also great that you have a circuit separate from the rest of the house (sans jacuzzi). This is equivalent to a separate subpanel and you can control whether the jacuzzi is on while you are listening. It is good that you have the top breaker and that only a few lights are on the circuit besides your stereo. Is this circuit a 3 wire (hot, common and ground)? If so, you are very close to a dedicated situation.
Are you having any problems with ground loop hum? Do light dim when appliances come on in other parts of the house? Is there objectionable background hiss? If not, what makes you think you need to go further? I would leave it alone for another year until you move.