Yamaha AS2000 - balanced input

I connected my PS Audio dac to a recently purchased Yamaha AS2000 integrated amp using the balanced connections and was disappointed to hear some audible distortion. The PS Audio dac has an output voltage of 5V though the balanced outputs and according to the Yamaha manual the AS2000 has a maximum input signal of 2.8V.

Are the dac's balanced outputs too hot for the amp and causing the distortion?

Is there a way to attenuate the dac's output with attenuators or modifying the dac, or would that affect sound quality? The amp sounds great with unbalanced connections, but I was hoping to take advantage of the balanced inputs since the amp and dac are both balanced.