Hi, I have an 8-bit DAC which is currently outputting about 0-3V. After some filtering etc this goes into the line-in of an audio amplifier.

Line level is supposed to swing from about -1.5 to 1.5V. I've seen online that this can be achieved by "biasing" the amplifier's ground to 1.5V.

The issue I've got is that the amplifier is powered from the same power supply as the rest of the circuit. The reference ground on the amplifier is the same as the power ground so there's no way for me to bias it.

Is there another way to get the required swing? I feel that I need to connect my DAC to -3V instead of ground but I don't have a negative supply.