This is probably an esoteric post, but I'm in the process of building some gear and discovered something quirky with the output level voltage from the unit. I hooked up my multimeter to the output so I could measure the voltage, and I ran a 1K sine wave at -3dB out of the interface to check the voltage level. Based on a 0dbu/dbm reference level of 0.775 volts RMS, I was expecting to see a reading of 0.548. Instead my multimeter read 1.34 volts! I'm pretty sure the multimeter is measuring RMS and not peak to peak, but even if it were, the p-p reading should have been 1.55, not 1.34.
I tried contacting MOTU to see what their output reference is based on, but I got this gem of a response "As of now, the information of voltage read out on the 828 mk2's analog outputs is not published." Does any one else out there have any insight into this issue and can possibly explain or point me in a direction to understand why this readin is off so much? The way I discovered the problem initially was by hooking up a VU meter, and it read close to 0db with a -3db signal out. That's when I broke out the multimeter to take the voltage reading and saw the voltage was way off.
I tried contacting MOTU to see what their output reference is based on, but I got this gem of a response "As of now, the information of voltage read out on the 828 mk2's analog outputs is not published." Does any one else out there have any insight into this issue and can possibly explain or point me in a direction to understand why this readin is off so much? The way I discovered the problem initially was by hooking up a VU meter, and it read close to 0db with a -3db signal out. That's when I broke out the multimeter to take the voltage reading and saw the voltage was way off.