signal attenuation through EVAL-ADAU1452REVBZ analogue connectors

Hi there,

I've been trying to work out why when I try to make some reference sweep measurements through my eval' board I'm getting an attenuated signal.  To test this, I sent a 1 kHz tone at 2.56 Vrms to analogue channel 0 (measured at the connector on the eval board), and through a signal path with no attenuation or gain applied, then measure the voltage at the 3.5mm output connector and I'm only measuring 0.6 Vrms.  That's approx' -12 dBV difference through the board.  What is going on?  Where is my signal getting attenuated?

Kind regards,