I would like some clarification regarding Bryston's Power isolation units.
First regarding the difference between a standard BIT20 and a BIT20AVR. Does the BIT20 only filters the electrical current or does it also stabilize it? If so, from a current stabilization point of view and resulting sound quality, what is the difference between the both units?
Second, I was told that I could use the BIT15 with a 4B3. Is this true? Your website suggest using the BIT15 with amplifier under 100w. Could you please clarify? Of course, if the BIT15 is sufficient and provides a similar performance as the BIT20, then I would get the BIT15 an save some money!