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.
johsti

Showing 2 responses by johsti

Yes, Yamaha did respond and simply confirmed that the balanced input couldn't accommodate a source with a 5V output. They did not clarify how much the maximum input was, but the manual says 2.8V.
Thanks Swanny.

The Yamaha AS2000 is fully balanced from input to output. It is actually a very impressive design and sounds amazing through the unbalanced inputs. I want to see if I can improve upon the sound by using the balanced inputs, but there is an obvious mismatch. I have a Cullen stage 4 PS Audio DLIII, so unfortunately there is no preamp function.

I just don't understand why the balanced inputs on the Yamaha AS2000 would be limited to a maximum input of 2.8V. This would make most balanced sources unusable with this amp. I've sent an email to Yamaha for an explanation.