@smart191, If none of the above suggestions work, please post the make and model number of your DAC. As we recommended above, we suggest you confirm the volume control on your DAC is set to the maximum volume (level). As @erik_squires noted, the output level switch may be on the back of the DAC (or some level setting on the front of the DAC).
Please keep us updated. Thanks..
Please keep us updated. Thanks..